New data from NASA’s Atmospheric Infrared Sounder (AIRS) instrument, aboard the Aqua satellite, shows the movement high in the atmosphere of carbon monoxide associated with fires in the Amazon region of Brazil.
The time series maps carbon monoxide at an altitude of 5 500m from 8 August to 22 August 2019. As the series progresses, the carbon monoxide plume grows in the northwest Amazon region then drifts in a more concentrated plume toward the southeastern part of the country.
Each “day” in the series is made by averaging three days’ worth of measurements, a technique used to eliminate data gaps. Green indicates concentrations of carbon monoxide at approximately 100 parts per billion by volume (ppbv); yellow, at about 120 ppbv; and dark red, at about 160 ppbv. Local values can be significantly higher.
A pollutant that can travel large distances, carbon monoxide can persist in the atmosphere for about a month. At the high altitude mapped in these images, the gas has little effect on the air we breathe; however, strong winds can carry it downward to where it can significantly impact air quality. Carbon monoxide plays a role in both air pollution and climate change.
AIRS, in conjunction with the Advanced Microwave Sounding Unit (AMSU), senses emitted infrared and microwave radiation from Earth to provide a three-dimensional look at Earth’s weather and climate. With more than 2 000 channels sensing different regions of the atmosphere, the instruments create a global, three-dimensional map of atmospheric temperature and humidity, cloud amounts and heights, greenhouse gas concentrations and many other atmospheric phenomena.
The AIRS and AMSU instruments are managed by NASA’s Jet Propulsion Laboratory in Pasadena, California, under contract to NASA. JPL is a division of Caltech.
Meanwhile, as the fire season in the Amazon approaches its midpoint, scientists using NASA satellites to track fire activity have confirmed an increase in the number and intensity of fires in the Brazilian Amazon in 2019, making it the most active fire year in that region since 2010.
Fire activity in the Amazon varies considerably from year-to-year and month-to-month, driven by changes in economic conditions and climate. August 2019 stands out because it has
brought a noticeable increase in large, intense, and persistent fires burning along major roads in the central Brazilian Amazon, explains Douglas Morton, chief of the Biospheric Sciences Laboratory at NASA’s Goddard Space Flight Centre.
While drought has played a large role in exacerbating fires in the past, the timing and location of fire detections early in the 2019 dry season are more consistent with land clearing than with regional drought.
“Satellites are often the first to detect fires burning in remote regions of the Amazon,” Morton says.
NASA’s primary tool for fire detections since 2002 has been the Moderate Resolution Imaging Spectroradiometer (MODIS) instruments on the Terra and Aqua satellites.
At this point in the fire season, MODIS active fire detections in 2019 are higher across the Brazilian Amazon than in any year since 2010.
The state of Amazonas is on track for record fire activity in 2019.
Morton noted that 2019 fire activity statistics distributed by NASA and Brazil’s Instituto Nacional de Pesquisas Espaciais (INPE) are in agreement.
“INPE also uses active fire data from NASA’s MODIS sensors to monitor fire activity in the Brazilian Amazon,” Morton says. “As a result, NASA and INPE have the same estimates of
changes in recent fire activity. MODIS detections are higher in 2019 than at this time last year in all seven states that comprise the Brazilian Amazon.”
MODIS fire detections are analysed by the Global Fire Emissions Database (GFED) project, which includes Morton and colleagues from NASA Goddard, the University of California, Irvine, and Vrije Universiteit Amsterdam. Over the years, the GFED team has processed 17 years of NASA satellite data to better understand the role of fire for changes in the Earth system. Their analysis of the southern Amazon includes parts of Brazil, Peru, and Bolivia that typically see fires between July and October.
These plots show cumulative active fire detections from MODIS and the Visible Infrared Imaging Radiometer Suite (VIIRS) on Suomi NPP through August 22, 2019. The data confirm that 2019 is the highest fire year since 2012 (the start of the VIIRS record) across the seven states that comprise the Brazilian Amazon.
In addition, fires in 2019 are more intense than previous years, as measured in terms of cumulative fire radiative power.
The map above shows active fire detections in Brazil as observed by Terra and Aqua MODIS between August 15-22, 2019. The locations of the fires, shown in orange, have been overlain on nighttime imagery acquired by VIIRS. In these data, cities and towns appear white; forested areas appear black; and tropical savannas and woodland (known in Brazil as Cerrado) appear gray. Note that fire detections in the Brazilian states of Pará and Amazonas are concentrated in bands along the highways BR-163 and BR-230.
Since 2003, MODIS sensors on NASA’s Aqua and Terra satellites have made daily observations of thermal anomalies (usually fires) around the world. The fire detection map on this page is based on data from the Fire Information for Resource Management System(FIRMS), a product developed by the University of Maryland and NASA’s Applied Sciences Program. FIRMS provides near-real-time fire information to natural resource managers and researchers. Note that each point on the map does not necessarily correspond to one fire on the ground. Active fire detections represent the centre of a 1 square kilometer area with one or more thermal anomalies. Sometimes one continuous fire can be recorded as multiple anomalies arranged in a line, representing a fire front.
Banner image: This time series shows carbon monoxide associated with fires from the Amazon region in Brazil from Aug. 8-22, 2019. Made with data collected from the Atmospheric Infrared Sounder (AIRS) on NASA’s Aqua satellite, the images map carbon monoxide at approximately 5 500m altitude. Each “day” in the series is made by averaging three day’s-worth of measurements.