A Scavenger Hunt for Fire

The first real taste of smoke comes shortly after 1 p.m. from what the team dubs the Half Pint Fire. It’s near the Texas-Louisiana state line. The plume is visible here near the wingtip. Credit: NASA/Joe Atkinson

by Joe Atkinson / SALINA, KANSAS /

Time for a change of scenery.

After nearly a month flying missions out of Boise, Idaho, to sample smoke from big wildfires in the western U.S., the Fire Influence on Regional to Global Environments and Air Quality, or FIREX-AQ, is pulling up stakes and moving to America’s heartland — Salina, Kansas, to be exact.

NASA’s DC-8 flying laboratory, the primary platform for the joint NASA-NOAA airborne science campaign, lands at the Salina Regional Airport Aug. 19.

From here, the mission will spend the next couple of weeks targeting smaller prescribed and agricultural burns in the south and southeast. These fires, which help to manage fuel loads and  reset plant succession, don’t put out as much smoke as the wildfires out west, but can still have a dramatic effect on air quality and weather.

Because the smoke from these fires is poorly represented in emission inventories and not always well visualized by satellites, it’s a prime target for FIREX-AQ researchers, who want to better understand its chemistry and behavior.

After an Aug. 20 event to inform the community and local media about the mission, the team gets down to brass tacks. Researchers had hoped one of their first missions out of Salina would target a prescribed burn in the Blackwater River State Forest in Florida’s panhandle, but soggy conditions have prevented that burn from happening. It’ll have to wait.

At an event to inform the community about FIREX-AQ, a TV news station from Wichita interviews mission scientist Jim Crawford. Credit: NASA/Joe Atkinson

Jim Crawford, FIREX-AQ mission scientist from NASA’s Langley Research Center in Hampton, Virginia, is hungry to get this new phase of the campaign underway, though. At the first Salina forecast meeting, he and the team decide to waste no time. They’ll fly the next day and let the ground team guide them to areas where small fires might be burning. It’ll be an opportunity to work out some kinks.

“This is a scavenger hunt profile that we’re flying,” Crawford says.

The event draws several school groups and a number of folks who are just curious to find out a little more about what NASA and NOAA are doing in town. A young aviation enthusiast drives six hours from Denver just to see the DC-8 with his own two eyes. Here, mission scientist Joshua “Shuka” Schwarz from NOAA’s Earth System Research Laboratory in Boulder, Colorado, talks to people on the DC-8. Credit: NASA/Joe Atkinson

The Search Begins

At the morning pre-brief for the Aug. 21 flight, Crawford unveils the flight plan, which will take the DC-8 on a roughly oval path that will cover ground from just over Lubbock, Texas, at its westernmost point to southern Illinois at its easternmost point. Based on information from satellites and models, fires are likely in the Oklahoma panhandle and northern Texas. Mission forecasters also expect to see agricultural fires in areas along the Mississippi River.

Following a long forecast meeting, the team decides to hunt for small prescribed and agricultural burns during its first flight for phase two of FIREX-AQ. Credit: NASA/Joe Atkinson
DC-8: The DC-8 sits on the tarmac at Salina Municipal Airport in the minutes before takeoff. Credit: NASA/Joe Atkinson

Everyone heads out to the tarmac and boards the DC-8. Researchers make final checks to their instruments and strap in. All said, there are 43 souls on this flight. It’s just after 10 a.m. and the plane is barely off the ground when Crawford’s voice chimes in over the headset.

“It’s not too soon to start looking for fires, folks,” he says.

He promises an award to the person who spots the most fires.

Early going is discouraging. A small plume in Kansas is deemed unworthy of measurement. Twin plumes a little farther down the flight path look interesting, but their proximity to windmills means it’ll be difficult for pilot Greg Slover of Langley to maneuver the DC-8 low enough for the instruments to make good measurements.

Over the panhandle of Oklahoma where the forecast team had anticipated fires to materialize, none do.

It’s 11 a.m. and the plane is somewhere over northern Texas — still no fire.

“We’re an hour in and batting zero,” Crawford says.

Finally, Fire

It’s almost noon before someone spots a promising plume in Texas between Lubbock and Wichita Falls.

This one is a surprise. Satellites haven’t picked it up. But it actually reinforces the reasoning behind this second phase of the campaign. Many smaller fires simply don’t show up in satellite imagery or models.

“This goes back to the question of, are we seeing these small fires?” Crawford says.

The plume turns out to be from an active, named wildfire that people on the ground are fighting. The team chooses not to fly through it.

Things are about to heat up, though.

The team opts to peel south of the intended flight path and head toward a potential target right on the Texas-Louisiana border, near Shreveport.

This is where things get fun. The plumes for these small fires don’t extended thousands and thousands of feet up like the ones from the wildfires out west, so in order for the scientists to be able to collect measurements with their instruments, Slover and crew have to bring the DC-8 in as low as regulations allow — 1,000 feet.

The air at 1,000 feet is turbulent and hot. The maneuvers to fly through these small plumes at multiple angles involve lots of stomach-churning twists and turns. If you’re prone to motion sickness, it’s not exactly an ideal situation.

But that’s the exact situation that occurs as the flight zeroes in on the blaze near the state line, which the team dubs the Half-Pint Fire.

Cameras on the DC-8 allow you to watch the flight from multiple angles on a laptop or phone. In this screengrab, you can see the shadow of the DC-8 on the ground in the moments before it flies through the Half Pint plume. On the left is an infrared view. The lighter colors are hotter. Credits: NASA

It’s a few minutes after 1 p.m. The DC-8 zooms forward, the treetops clearly visible below. Over the headset, Crawford counts down the approach to the plume:

3, 2, 1

The heat rising off the burning field causes a jolt of turbulence. Readouts on computer monitors spike as instruments register the gases in the smoke plume.

“Oh yeah!” one of the scientists says over the headset.

“Big hit!” says another one.

The acrid smell of the smoke fills the cabin for a few seconds.

This is just the beginning.

The folks on the ground have spotted a potential target near the Mississippi River in northeastern Louisiana. There, the team hits the jackpot. It turns out multiple small agricultural fires are burning in the area.

After a brief respite at a smooth, comfortable altitude, the DC-8 dips back to an altitude where details on the ground are easy to make out. The pilots fly bowtie patterns that carry us through one plume after another. The team hits on a food theme as it names the fires — Lil’ Debbie, Rice-A-Roni, Crawdad, Crawbaby, Gumbo.

Crawford is wearing a prescription patch that staves off motion sickness — an oft used medication in the airborne science world.

“Even with the patch,” he says, “I’m feeling a little woozy.”

A Brief Aside

This is where I take a moment to break the fourth wall and tell you I puked for science.

As we maneuvered through what I’ll call the food fires, I scribbled this in my notebook: 2:10p.m. fires near the Louis./Miss. state line.

After that, I put my head back, closed my eyes and waited for the inevitable.

Shortly after we crossed the Mississippi River into Mississippi and made a beeline for a fire the team would name Jambalaya Jr., I pulled off my headset and made as much of a beeline to the lavatory as the turbulent conditions would allow.

It was an interesting experience given all the maneuvering. I lost track of time and prayed for it to be over soon. And then it was over and I emerged from the lavatory feeling much better. As I got back to my seat, we had just finished zipping through the last plume we would sample—from the Po’Boy Fire.

Thank God.

With some guidance from the team on the ground, we finally hit the jackpot and find multiple small fires blazing on both sides of the Mississippi River in Louisiana and Mississippi. As illustrated on the flight plot here, the pilots fly nauseating low-level crossing patterns through one fire after another. The team names most of the fires after food. Credits: NASA

A Learning Experience

After Po’Boy, it’s over. The pilots climb back to a comfortable altitude and head back to Salina. We never made it to the easternmost point on our original flight plan, but after a start that suggested a fire famine, we found our fire feast in the southeast.

Following the intense flying of the last hour or so, some of the scientists get up and mill around the cabin and chat or eat snacks. Others try to catch a few winks on the trip back to home base.

Carsten Werneke, FIREX-AQ mission scientist from the University of Colorado working at the National Oceanic and Atmospheric Administration’s Earth System Research Laboratory in Boulder, Colorado, is part of the ground team in Salina that’s been directing the aircraft to fires. Over the text chat system that allows scientists on the aircraft to communicate with scientists on the ground, he has an exchange with Crawford:

carsten_: I think we learned a lot today, should be easier next time.

JimC_DC8: Agreed

At the post-flight debrief shortly after the plane lands back in Salina, Crawford shares his thoughts.

He notes that on future flights it would make more sense to fly high and fast to known or suspected hot spots, rather than low and slow, hoping to spot fires along the way, which was the approach during the first part of today’s flight.

He also tips his hat to the pilots for “carving it up” once the fires materialized, not only because they flew successful crossing patterns through the plumes, but also because they were able to get lined up directly on the next targeted fire.

Mostly, Crawford expresses his happiness with how phase two of FIREX-AQ has begun.

“After a slow start,” he says, “we take away from this the pretty optimistic view that we can get a lot of fires.

Plumes Go the Distance

True color satellite image of Canada and the northern United States on July 23, 2019. Fires in northern Alberta (red dots in top left) produced smoke that traveled to the Great Lakes (bottom right) over the course of a few days. Credit: NASA EOSDIS / Worldview
True color satellite image of Canada and the northern United States on July 23, 2019. Fires in northern Alberta (red dots in top left) produced smoke that traveled to the Great Lakes (bottom right) over the course of a few days. Credit: NASA EOSDIS / Worldview

by Ellen Gray / BOISE, IDAHO/

From Alberta, Canada, to Michigan, USA. That’s how far the plumes of smoke traveled in a few short days, from July 21 to July 24. Smoke from wildfires has staying power.

Laura Thapa, a graduate student at the University of California Los Angeles and member of the FIREX-AQ forecasting team, has been monitoring the smoke from the northern Alberta fires over the last few days. She and her team first took notice of the plume on July 21, when its leading edge had already traversed half of the approximately 2000-mile journey to the Great Lakes by July 24.

Tracing a plumes’ journey accomplishes two main goals for FIREX-AQ. “It lets us verify the forecast models,” Laura said. The forecast team wants to improve and fine tune a number of smoke transport models that use weather and other data to project where smoke plumes end up.

In particular, scientists want to know where the fine particulate aerosols called PM 2.5 go. The microscopic particles are one of the biggest health hazards associated with fires. When breathed in, they can lodge deep in the lungs, causing irritation and coughing. Long term exposure has been linked to higher rates of respiratory and heart problems.

“I have asthma, so that’s my vested interest,” Laura said. It’s also the vested interest of the U.S. Forest Service, which leads the interagency Wildland Fire Air Quality Response Program, and the Environmental Protection Agency that closely monitors PM 2.5 and tries to limit exposure to communities downwind of fires.

The other goal tracking plumes serves is much more practical during the campaign. As the fire season progresses, background smoke from fires-in-progress may be present in the air when a new fire starts and a new plume develops. Keeping track of plumes as they travel helps tease out what fires contributed to the smoke the science team is measuring in the DC-8.

“Understanding the transport is important for seeing what’s going on,” Laura said.

The DC-8 Goes the Distance, too

The DC-8 takes off from Boise, Idaho, for a science flight on July 25, 2019. Credit: NASA
The DC-8 takes off from Boise, Idaho, for a science flight on July 25, 2019. Credit: NASA

The FIREX-AQ team will be in Boise through August 18, but for the Communications team our coverage is at an end. For now.

After Boise, the DC-8, Twin Otters, Mobile Labs, and everything else FIREX-AQ brought with them to Boise will travel to Salina, Kansas, to study prescribed agricultural fires which have different fuels and emissions.

Stay tuned.

 

Join us on @NASAExpeditions Twitter and NASA Expeditions Facebook for more from FIREX-AQ in Boise. Our coverage in Salina will continue on @NASAEarth and the NASA Earth Facebook page.

Fire Weather, Pyro Weather

True color satellite image from MODIS on July 28, 2019. The red dots are fires detected by the MODIS and VIIRS instruments. In southwest Oregon, the smoke plume from the Milepost 97 fire is visible. Credit: NASA EOSDIS/ Worldview
True color satellite image from MODIS on July 28, 2019, of Washington, Oregon and Idaho. The red dots are fires detected by the MODIS and VIIRS instruments. In southwest Oregon, the smoke plume from the Milepost 97 Fire is visible. The red dot in central Idaho is the Shady Fire. Credit: NASA EOSDIS / Worldview

by Ellen Gray / BOISE, IDAHO/

Each morning Amber Soja gets up at 5:00 a.m. to check the fire weather. She’s an associate scientist from the National Institute of Aerospace based at NASA’s Langley Research Center in Virginia, one of the lead forecasters for FIREX-AQ with one of the most important jobs: distilling the information from the National Weather Service, the National Interagency Fire Center, and other satellite and model info into a short list of fires for the DC-8 to visit the next day. All by 8 a.m.

Understanding fire weather is a big part of the job. Fire weather is the term used to describe weather conditions favorable for fires to start or burn, a mixture of high temperature, low humidity, zero to low rainfall, and high winds.

“Fire weather is the potential to have the fire behavior that we want to see,” Amber said. Hot, dry and windy conditions build over the course of a day’s worth of sunshine, so that where fire weather conditions are present in the morning, fires in the same area are likely to become active in the late afternoon. And for the FIREX-AQ science team, active usually means a smoke plume to fly through.

The National Weather Service puts out daily maps of where they forecast fire weather to be elevated. This map came out on July 28, 2019. Credit: NOAA/ NWS
The National Weather Service puts out daily maps of where they forecast fire weather to be elevated. This map came out on July 28, 2019. Credit: NOAA/ NWS

At 10:00 a.m., Amber presents her team’s short list of fires to the science team at the daily morning briefing. This is the meeting where decisions are made about where and when to fly the DC-8. In a neat table projected on the wall, the fire short-list also takes into account the types of fuel on the ground – the second major ingredient for wildfires, and one that can change the chemistry of the plume whether its grassland or timber – as well as location, size, and what action is being taken to monitor and fight the fire, among other considerations.

While Amber is putting together the fire outlook, David Peterson from the U.S. Naval Research Laboratory in Monterey, California, is working with a team of meteorologists and forecasters to monitor and forecast weather systems. It’s a slightly amped up version of a local weather newscast, and includes current conditions and outlooks for high and low pressure systems, moisture, and cloudiness that could hamper the DC-8. By 9:00 a.m. they’re analyzing their model results, and at the 10 a.m. briefing, David shares the forecast with the science team.

The forecasting team meets early everyday to look at upcoming fire and weather conditions. July 28, 2019. Credit: NASA
The forecasting team meets early everyday to look at upcoming fire and weather conditions. July 28, 2019. Credit: NASA

He’s also on the lookout for the potential for a different type of weather – weather generated by the fires themselves.

“A fire is a heat source. It’s creating a strong updraft,” David said. The smoky air above a large, hot fire shoots upward like going up a chimney, and in the void left behind, more air is sucked in from the sides, which gets heated and lofted. When this fire-generated circulation lofts the smoke high enough, from 15,000 to 30,000 feet, and there’s moisture at the higher altitudes, pyrocumulonimbus clouds can form – also known as smoke-infused thunderstorms.

These billowing, smoke-polluted storms don’t really produce rain, but lightning strikes are possible. They can also, in some cases, loft a large smoke plume into the upper atmosphere (stratosphere), where it can circulate around the globe, similar to the impact from a volcanic eruption.

With each daily forecast, David is on the lookout for conditions that might produce pyro-clouds and thunderstorms. In the coming week, the weather over the Shady Fire looks promising, but only time – and a little luck – will tell.

UPDATE Aug 13, 2019: The DC-8 flew through a pyrocumulous cloud on August 8 generated by a fire in eastern Washington. David got to sit in the cockpit and see the cloud from the air. See the stunning pictures and read more about it at NASA’s Earth Observatory Image of the Day.

Join us on @NASAExpeditions Twitter and NASA Expeditions Facebook for more from FIREX-AQ.

A Visit to the National Interagency Fire Center

The National Interagency Fire Center in Boise, Idaho, is the nerve center for fire fighting operations in the United States. Credit: NASA
The National Interagency Fire Center in Boise, Idaho, is the nerve center for firefighting operations in the United States. Credit: NASA

by Ellen Gray / BOISE, IDAHO/

The FIREX-AQ campaign is flying out of Boise, Idaho. The choice of location was no accident. Boise is also home to the National Interagency Fire Center (NIFC), the nerve center of all major firefighting operations for the United States. Earlier this week, we took a tour.

“NIFC is not an organization, it’s a place. Each big bureau dealing with fires has people here,” said Kari Cobb, our tour guide with the Bureau of Land Management in the Department of Interior that hosts the center.

In addition to the Bureau of Land Management, the agencies working together to put out major wildfires, support the crews in the field and assist with other disasters include the National Association of State Foresters, the USDA Forest Service, the Department of Defense, the National Oceanic and Atmospheric Administration, the Bureau of Indian Affairs, the National Park Service, the United States Fire Administration, and the U.S. Fish and Wildlife Service.

The center is located next to the Boise Airport – across from the Idaho Air National Guard where the DC-8 is stationed for FIREX-AQ. Airport access is essential for the helicopters and planes used to deliver crews and supplies to firefighting teams in the field, and also for reconnaissance planes that survey active fires with infrared instruments to detect hotspots hidden by smoke plumes.

The Radio Cache

The NIFC Radio Cache has a team of technicians that check and refurbish every single handheld radio and repeater. They will replace faulty parts down to the transistor to extend the radios' lifetimes. Credit: NASA
The NIFC Radio Cache has a team of technicians that check and refurbish every single handheld radio and repeater. They will replace faulty parts down to the transistor to extend the radios’ lifetimes. Credit: NASA

In order to coordinate, you need to be able to communicate. NIFC’s Radio Cache ensures that’s possible. They manage, repair and refurbish the 11,000 handheld radios and radio repeaters that get delivered to firefighters in the field. They deliver the equipment in kits that are already pre-programmed to be ready to plug-and-play as soon as they arrive. While all the radios are ultimately managed and dispatched from Boise, they pre-position equipment closer to likely fire activity and other disaster-prone areas.

The Great Basin Cache

NIFC's Great Basin Cache supplies all of a firefighter's gear except for their boots. Credit: NASA
NIFC’s Great Basin Cache supplies all of a firefighter’s gear except for their boots. Credit: NASA

When you’ve got people fighting fires for weeks on end, you need a place for them to sleep, eat and manage day-to-day operations. Kari described the giant warehouse that makes up the Great Basin Cache as the “Costco” of wildland fire management. It’s the largest of the 16 caches set up in different parts of the country, and has everything needed for the Incident Command Posts, from tents, sleeping bags, tables, and coffee, to firefighters’ personal protective gear, and the shovels, Pulaskis (axe plus flat-head scraper), MCleods (a type of rake) and combi-tools (with a shovel and pick head) they use to clear vegetation and dig fire breaks.

Smokejumpers

Smokejumpers wear Kevlar jump suits to avoid punctures from rocks and branches when they land in rough terrain. They also carry extra rope for getting out of trees. Credit: NASA
Smokejumpers wear Kevlar jump suits to avoid punctures from rocks and branches when they land in rough terrain. They also carry extra rope for getting out of trees. Credit: NASA

There are plenty of people willing to jump out of perfectly good airplanes, but not nearly as many willing to jump out of a plane next to a wildfire. In the United States, there are 450 in fact, and 80 to 85 of these smokejumpers are stationed out of Boise at any given time. Currently most of the Boise smokejumpers are at out-stations, located across the West to be closer to fire-prone areas.

They’re delivered to remote fires by Twin Otter aircraft and jump from 3000 feet in special gear made of Kevlar that each smokejumper has made themselves (they’re required to know how to sew and use a sewing machine.) They jump with one main parachute, a reserve parachute and two days of personal gear. Once they’re on the ground, the plane drops supply kits for two firefighters for two days. Their regular firefighting gear is on under their jump suit, which they stash before getting to work.  Once they’ve done their initial assessment and work at the fire site, relaying info back to base, they hike out.

National Weather Service Boise

The National Weather Service Boise station forecasts fire weather and monitor lightning strikes which can cause fires. Credit: NASA
The National Weather Service Boise station forecasts fire weather and monitors lightning strikes which can cause fires. Credit: NASA

Weather conditions – wind, humidity, rain and temperature – are fundamental to understanding what a fire is doing and where it will go next. The National Weather Service station in Boise monitors and forecasts weather for southwest Idaho and western Oregon. They’re staffed 24 hours a day, and use satellite imagery and models to forecast not only the weather, but fire weather – conditions favorable for burning. They also track lightning strikes, which are one of the main causes of wildfires in the region.

National Interagency Coordination Center

NIFC's National Interagency Coordination Center supports fire fighting efforts across the country. Credit: NASA
NIFC’s National Interagency Coordination Center supports firefighting efforts across the country. Credit: NIFC

Putting it all together is the National Interagency Coordination Center – effectively a national dispatch center, which manages the support resources and sends them into the field where they are needed. Fire management begins locally, at the town or county level. When their capacity for fighting a wildfire is exceeded, they go to their regional support center, one of eleven spread throughout the country. When their resources are exceeded, that’s when they call on the National Interagency Coordination Center in Boise – who then pulls crews from other regions, and sometimes Canada, Australia and New Zealand, to help put out the fires. They also supply information, helicopters and water tankers, and handle getting food and showers in place at the Incident Command Post.

 

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The Shady Fire, a Deviation From Plan

The Shady Fire smoke plume seen from the DC-8 on Thursday, July 25. Credit: Bernadett Weinzierl, University of Vienna
The Shady Fire smoke plume seen from the DC-8 on Thursday, July 25, 2019. Credit: Bernadett Weinzierl, University of Vienna

By Ellen Gray / BOISE, IDAHO/

Thursday, July 25

“It’s nice to have a flight plan to deviate from,” said DC-8 pilot Tim Vest at the debrief on Thursday night. It was just after 10 p.m. and the DC-8 had just returned from a 6-hour flight over a fire they weren’t planning on visiting.

The original plan for the afternoon was to fly to eastern Washington State, where several fires were burning in clear skies. But wildfires are tricky things. That morning during flight planning, the Shady Fire, less than 30 minutes away by air in the Salmon-Challis National Forest, didn’t look like it was going to generate an impressive smoke plume. But a half hour before take-off at 4 p.m., after the instrument teams were aboard and the DC-8’s doors were closed, the scientists staying behind to monitor the flight from the ground pulled down new satellite images.

“They said, take a look at the Shady Fire once you’re in the air,” said Carsten Warneke from the University of Colorado working at the National Oceanic and Atmospheric Administration’s Earth System Research Laboratory in Boulder, Colorado. He’s one of FIREX-AQ‘s project scientists and was sitting in the DC-8’s cockpit jump seat as Thursday’s flight mission scientist.

Flying north on their original plan to the Washington fires, Carsten  – and everyone else with an eastern-facing seat – looked out the window. Shady’s smoke plume was big and billowing. The hot and dry conditions of the late afternoon had invigorated the fire and helped to loft its smoke thousands of feet into the atmosphere.

The Shady Fire seen from the ground in the Salmon-Challis National Forest on Friday, June 26. Credit: U.S. Forest Service
The Shady Fire seen from the ground in the Salmon-Challis National Forest on Friday, June 26, 2019. Credit: U.S. Forest Service

“It was very exciting,” said Carsten. Measuring smoke was why the science team was flying. “But it was also a surprise. We had a completely different flight plan, but then there was that plume.”

So, less than half an hour after take-off, the flight plan changed.

Fortunately, the Shady Fire had been the second fire on the list for the previous day’s flight, although they’d only made one pass over its then-low-lying plume. Tim Vest and his co-pilot, Dave Fedors, both from NASA’s Armstrong Flight Research Center, were able to use the that plan once they redirected.

Aboard the Aboard the DC-8, monitors show Wednesday's flight plan in black overlaid by the actual path of the plane in red. On the left you can see the sharp right turn from diverting from the original plan. At this point in the flight they'd completed one sequence of the lawnmower sampling path. Credit: NASADC-8, monitors show Wednesday's flight plan in black overlaid by the actual path of the plane in red. At this point in the flight they'd completed one sequence of the lawnmower sampling path. Credit: NASA
Aboard the DC-8, monitors show Wednesday’s flight plan in black overlaid by the actual path of the plane in red. On the left you can see the sharp right turn from diverting from the original plan. At this point in the flight they’d completed one sequence of the lawnmower sampling path. July 25, 2019. Credit: NASA

Flying over a wilderness area was a huge advantage. With no other air traffic, aside from a pass from a plane gathering a hotspot survey for the U.S. Forest Service, the pilots had a lot of room to work with. They guided the plane in a series of maneuvers that began with flying above the plume at 15,000 feet to gather data from the remote sensing instruments. Then they cruised to a lower altitude of about 5,000 feet above the terrain and flew through the plume in a pattern called “the lawnmower” that cut north-south back and forth across the eastward-stretching plume. By the time they’d completed the first pass, the plume had been spread by winds farther east, and the smoke gases had been reacting in the atmosphere for about two and a half hours since they began. So they went back to the source and “mowed” it again, and then did a third pass east to west through the length of the plume. By the time they headed back to Boise, the plume had extended to the Wyoming border.

Flying through the plume, it was surprisingly dark, said Carsten. During each lawnmower pass, they had zero visibility where the smoke was thickest, closer toward the Shady Fire’s vertical plume (which they didn’t fly through because it was too hot and turbulent). The light that filtered in, especially as they moved toward the less dense eastern end, was yellowish-brown that snapped to clear once they exited the smoke on each perpendicular pass.

“It was smelly, too,” said Carsten. “Not as bad as I was expecting but it still smelled like smoke.”

The view from the jump seat right after take-off. From here, Carsten as mission scientist can easily communicate with the pilots and flight engineer in the cockpit. Credit: NASA
The view from the jump seat right after take-off. From here, Carsten as mission scientist can easily communicate with the pilots and flight engineer in the cockpit. July 25, 2019. Credit: NASA

As mission scientist, Carsten was in charge of meeting the science goals of the flight. This largely meant he was frequently switching between chatting with the ground team who had the updating satellite imagery and two different headsets on the plane: one on the science team channel where requests for adjustments were flying thick and fast, and one on the pilot channel to figure out what was possible and safe for the aircraft. Balancing all that information, Carsten directed the details of the flight to try to get the best measurements for everyone.

“Then after we turned at the end of each pass, I would call out on the science channel ‘Get ready we’re measuring smoke in 30 seconds,'” he said.

A close up of the Shady Fire's smoke plume during sampling on July 25, 2019. Credit: Bernadett Weinzierl, University of Vienna
A close up of the Shady Fire’s smoke plume during sampling on July 25, 2019. Credit: Bernadett Weinzierl, University of Vienna

The Shady Fire started from a lightning strike on July 10 at about 6 p.m. Since it’s in a wilderness area far from populated areas, the U.S. Forest Service has closed nearby roads and trails and is monitoring it, but otherwise letting it burn for now – with the exception of protecting specific buildings and assets in the area. So far it has burned more than 2600 acres of primarily subalpine fir and lodgepole pine trees.

For the FIREX-AQ science team the Shady Fire is exactly what they’re looking for to study smoke dynamics in the atmosphere – what are the gases and airborne particles in plumes and how do they evolve as they age and spread downwind.

“We’re measuring everything a non-chemist knows about and then 500 more chemicals,” said Carsten. The DC-8 is loaded up with instruments and more than 30 scientists to run them during flight. Among the gases they’re measuring are carbon dioxide, carbon monoxide, and nitrogen oxides, as well as particulate aerosols including soot and black carbon.

The interior of the DC-8 has instruments where seats would be on a commercial plane. They suck smoke inside through inlets and tubing that connect to the instruments. July 25, 2019. Credit: NASA
The interior of the DC-8 has instruments where seats would be on a commercial plane. They suck smoke inside through inlets and tubing that connect to the instruments. July 25, 2019. Credit: NASA

They’re also measuring chemicals formed in the plume, such as ozone. Ozone near Earth’s surface is a pollutant and health hazard that the Environmental Protection Agency monitors to evaluate air quality. It forms from a reaction of nitrogen oxides with volatile organic compounds (both emitted in large amounts from the fire) in the presence sunlight (that often forgotten ingredient in atmospheric chemistry.) During Thursday’s flight, the team saw ozone forming in the plume.

The science team’s excitement was palpable when they returned, and the instrument teams spent Friday getting a first crack at their data. Their deviation from the plan had been a huge success.

At the Friday morning briefing, when the team was taking a look at their options in Washington and Oregon for Saturday’s proposed flight, project scientist Jim Crawford from NASA Langley said, “Put together a flight plan for each of them.”

“And,” said Jack Dibb, project scientist from University of New Hampshire, “have a plan for Shady in our back-pocket.”

 

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Laying Down with Smoke in the Valley, an Unexpected Camping Trip

Bruce Anderson and the NASA Langley Mobile Lab in a valley near Stanley, Idaho. July 24, 2019.
Bruce Anderson and the NASA Langley Mobile Lab in a valley near Stanley, Idaho. July 24, 2019. Credit: NASA

By Ellen Gray / NEAR STANLEY, IDAHO /

Wednesday, July 24

We were ready to fly. We’d heard Tuesday evening that there were two seats open on the DC-8 for the communications team on Wednesday, but as often happens in the field, plans change. For the first science flight, requests for extra seats from the instrument teams came in after the morning briefing. Safety first, science second, and communications third. But rolling with the change of plans opens up new opportunities, and ours was leaving at 2 p.m.

Out in the hangar parking lot, the NASA Langley Mobile Laboratory was getting ready to head into the Idaho wilderness. The van is big, boxy, and white. Unmarked, it looks like the kind of van movie FBI agents use for surveillance, but inside the equipment is designed to watch the sky. Specifically, the small team of five is looking at trace gases and aerosols from smoke plumes that will sink to valley floors during the night when temperatures cool.

The Langley Mobile Lab is one of two that will be deployed to take ground-level measurements during the FIREX-AQ field campaign. Ideally, the team parks the van downwind from a blazing fire whose smoke flows over the van site, said Bruce Anderson, the principle investigator for the NASA Langley Aerosol Research Group Experiment that runs the van. From their parking spot, they’ll watch the emissions evolve as the fire goes from hot and intense to smoldering and from hot daytime temperatures to cold nights and back to day.

With about two hours’ notice, Bruce graciously agreed to let us tag along. “Do you have camping gear?” he asked.

I had a sleeping bag I hadn’t expected to use during FIREX-AQ. None of us had meant to sleep anywhere but at our hotel. But this trip was too good to pass up. We reassured Bruce that we’d make do.

Landscape Shaped By Fire

Burned trees and recovering undergrowth at varying stages make up the National Forests along Highway 21 in Idaho. July 24, 2019. Credit: NASA
Burned trees and recovering undergrowth at varying stages make up the National Forests along Highway 21 in Idaho. July 24, 2019. Credit: NASA

Because of the van’s size, Bruce drove the long way on the major highways to Stanley, Idaho, a town in the middle of the Sawtooth National Recreational Area. We took the more direct and windier Highway 21 through the Boise and Challis National Forests.

Boise is located on a plain, with brown hills dotted by shrubs dominating the landscape. As we drove northeast, the hills gave way to forests of lodgepole pines and subalpine firs. Fires’ mark on the landscape soon became clear.

Fire is part of the ecosystem in the western U.S., leaving behind ghostly trees and charred soil that will grow new life. July 24, 2019. Credit: NASA
Fire is part of the ecosystem in the western U.S., leaving behind ghostly trees and charred soil that will grow new life. July 24, 2019. Credit: NASA

Amid the green trees of the forest, we passed entire slopes of ghostly trees, burned pale and dead but still standing with bare branches. On some slopes, grasses and scrub had regrown. On others, smaller baby trees made up the understory. On still more, the burned ghost trees were interspersed with healthy green trees at the same height – likely grown to maturity after the fire. The marks of past fires were everywhere – and then we passed the blackened char of recently contained fires.

The Canyon Fire and the Vader Fire were both near the road, and while the flames were out where and when we saw them – each fire was 75-80% contained at that point – smoke was smoldering from a few hotspots on the ground. The Canyon Fire started from a lightning strike on July 14, a common cause for wildland fires. The Vader Fire’s cause is still unknown.

Nighttime Science

Our campsite near Stanley, Idaho, was in the middle of a long and wide valley, framed by mountains. July 24, 2019. Credit: NASA
Sunrise at our campsite near Stanley, Idaho. We were in the middle of a long and wide valley, framed by mountains. July 25, 2019. Credit: NASA

We met up with the team in Stanley at the end of Highway 21 around dinner time. It’s a tiny town with a tiny population of 63 that is the launching point for seasonal visitors to the Sawtooth’s and surrounding national forests. After three hours of driving with no reception, it’s also a welcome oasis of internet and cell service within the wilderness – essential for meeting up with the Mobile Lab caravan.

In addition to Bruce, Jackson Kaspari from the University of New Hampshire and Jiajue Chai from Brown University were driving an RV to make the camping a little easier. In a separate car were Kathleen Brunke from Christopher Newport University and Carolyn Jordan from the National Institute of Aerospace with tents and camping gear. They were all looking forward to being in the field for FIREX-AQ.

“It’s a little like science camp,” said Carolyn. “You get to go out with all these people who study the same thing you do.” She raised her hands in an excited pantomime of sharing data. “What did you get? Here’s what I got!”

After dinner we headed out back the way we came a few miles down a long and wide valley with a stream running through it, and then off onto a lengthy gravel road to our campsite in the middle of the meadow.

We helped Carolyn set up tents for the night while the others got their instruments running. She joined them in the van right afterwards.July 24, 2019. Credit: NASA
We helped Carolyn set up tents for the night while the others got their instruments running. She joined them in the van right afterwards. July 24, 2019. Credit: NASA

Off in the distance a plume of smoke from the Shady Fire to the north drifted by the nearby hills. Before sunset and after testing the wind direction, the scientists got to work setting up their instruments in the van – running the power generator, opening intake valves and hatches to the outside air, attaching filters to catch particulate aerosols. It was a clear night, and in the end not much smoke made its way to the middle of the valley where we were.

“It’s a little like fishing,” Bruce said. You do your best to find a good spot based on the information and weather, but sometimes the smoke doesn’t bite.

Earlier in the week, Sunday night to Monday morning, however, the Mobile Lab at the same site caught a lot of smoke from a fire near the highway. The smoke plume sank to the valley around midnight, and the team measured the height of the smoke particles with an infrared laser looking upward and bouncing off the particles back to the laser.

Jackson climbs to the roof of the van to open and set up the inlet valve that will suck exterior air into the van. July 24, 2019. Credit: NASA
Jackson climbs to the roof of the van to open and set up the inlet valve that will suck exterior air into the van. July 24, 2019. Credit: NASA

In the van, each researcher had an instrument measuring different aspects of the smoke and addressing different science questions. Carolyn’s instrument measured the scattering or absorption of light by smoke particles. The scattering tells her about the size and shape of the particles, and the absorption something about their chemical composition. Kathleen was collecting particulates in the air that she will take back to the lab to measure for heavy metals – evidence that bits of soil got burned and swept up into the smoke plume – and PM 2.5, the particulate matter size that can cause respiratory problems for people who breathe it in.

Jackson’s instrument collected air into hand-blown glass chambers filled with mist that serves as seed points to collect nitrite (NO2), nitrate (NO3), and sulfate (SO4) that then run through chromatography to determine their concentrations. Jiajue’s instrument collected air samples to measure for nitrogen oxides and nitrous and nitric acid. Nitrogen compounds are essential for determining the role ozone plays in the atmosphere. Ozone reacts readily with other gases in chains of chemical reactions that can ultimately process harmful gases like greenhouse gases out of the atmosphere. Jiajue also uses nitrogen and oxygen isotope ratios to “fingerprint” the fuel source of the air – whether the smoke came from vehicles, soils or burned vegetation.

Jiajue prepares sample bottles for his instrument inside the Mobile Lab. July 24, 2019. Credit: NASA
Jiajue prepares sample bottles for his instrument inside the Mobile Lab. July 24, 2019. Credit: NASA
Bruce and Carolyn look at initial readings of gases inside the van. July 24, 2019. Credit: NASA
Bruce and Carolyn look at initial readings of gases inside the van. July 24, 2019. Credit: NASA

Bruce was a one-man show monitoring 14 instruments that doubled up some of the others’ measurements and also took measurements of major gases like carbon dioxide (CO2) and carbon monoxide (CO), whose ratio of one to the other can determine whether the smoke came from a hot intense fire (low CO) or smoldering fire (higher CO). Another instrument measures the mass of soot in the air, and others look at the optical properties of soot and various gases so that they can ultimately improve satellite interpretations of plume composition.

Together these individual measurements build a more complete understanding of how smoke particles and gases react and evolve in the atmosphere, what they say about their fuel sources, and ultimately how they affect the air quality people encounter downwind.

Kathleen sets up her instrument that will filter exterior air and capture airborne particles on filters. She'll take the filters, frozen to preserve them, back to her lab at the end of the campaign for analysis. July 24, 2019. Credit: NASA
Kathleen sets up her instrument that will filter exterior air and capture airborne particles on filters. She’ll take the filters, frozen to preserve them, back to her lab at the end of the campaign for analysis. July 24, 2019. Credit: NASA

On a smoky night, the researchers barely sleep. While some of the instruments are fully automated, they often monitor them until past midnight, and Kathleen and Jiajue have to swap out filters and sample bottles every few hours.

The night we were out they got a reprieve, but Bruce stayed up most of the night anyway to monitor the instruments and make sure everything was running smoothly. Also, the cold made it difficult to sleep. While it was 95 degrees F in sunlight, the dry, cloudless Idaho night doesn’t hold moisture, and so temperatures dropped to below freezing, making the noisy, generator-heated van the warmest spot in camp. Those of us without proper camping gear, ended up sleeping in the car.

Despite the cold, we woke to a beautiful sunrise and to smoke plumes from the Shady Fire edging the valley. The Mobile Lab team packed up and headed back to Stanley for breakfast and to call in to the morning briefing on fire activity to find out where they were going next.

Join us on @NASAExpeditions Twitter and NASA Expeditions Facebook for more from FIREX-AQ.

Fires and Smoke with FIREX-AQ: Live from Idaho

by Ellen Gray / BOISE, IDAHO/

NASA, NOAA and university researchers are on an Earth expedition this summer studying fires and their smoke in the U.S. West. On July 23 from Boise, Idaho, the Fire Influence on Regional to Global Environments and Air Quality or FIREX-AQ, kicked off its study of fire smoke, what gases and tiny particulates are in it, and how they evolve and travel over the course of the fire’s lifespan and beyond. By gaining a better understanding of fire behavior and smoke plumes from direct measurements, the research done here will benefit satellite measurements and air quality forecasting in the future, as well as improve our overall understanding of fire dynamics in the atmosphere and their effects on climate.

NASA's DC-8 flying laboratory (left) and one of NOAA's Twin Otters (right) overfly fires and smoke during the FIREX-AQ campaign. They are being hosted by the Idaho National Guard's 124th Fighter Wing in Boise, Idaho.
NASA’s DC-8 flying laboratory (left) and one of NOAA’s Twin Otters (right) overfly fires and smoke during the FIREX-AQ campaign. They are being hosted by the Idaho National Guard’s 124th Fighter Wing in Boise, Idaho.

I’m Ellen Gray, a NASA science writer, and myself along with two NASA video producers, Katy Mersmann and Lauren Ward, will be shadowing the science team in Boise over the next week, sharing what it’s like to do science in the field with NASA’s DC-8 flying laboratory, two NOAA Twin Otter aircraft, and NASA Langley’s Mobile Laboratory, among many other moving parts that are taking measurements of smoke from the source.

We’ll be posting our day-to-day updates on the @NASAExpeditions Twitter and NASA Expeditions Facebook account and our deeper dives here and on the @NASAEarth Twitter and NASA Earth Facebook accounts. So follow along and stay tuned!

Boise is home to the National Interagency Fire Center (NIFC), a multi agency coordination center for fighting fires across the United States. NIFC, the U.S. Forest Service, the Joint Science Fire Program, the Bureau of Land Management as well as the National Science Foundation, the U.S. Environmental Protection Agency, and the California Air Resources Board are all partners in the FIREX-AQ campaign.
Boise is home to the National Interagency Fire Center (NIFC), a multi-agency coordination center for fighting fires across the United States. NIFC, the U.S. Forest Service, the Joint Science Fire Program, the Bureau of Land Management as well as the National Science Foundation, the U.S. Environmental Protection Agency, and the California Air Resources Board are all partners in the FIREX-AQ campaign.