Abnormally warm temperatures have spawned an intense fire season in eastern Siberia this summer. Satellite data show that fires have been more abundant, more widespread, and produced more carbon emissions than recent seasons.
The area shown in the time-lapse sequence above includes the Sakha Republic, one of the most active fire regions in Siberia this summer. The images show smoke plumes billowing from July 30 to August 6, 2020, as observed by the Visible Infrared Imaging Radiometer Suite (VIIRS) on NASA/NOAAs Suomi NPP satellite and the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASAs Terra satellite. Strong winds occasionally carried the plumes as far as Alaska in late July. As of August 6, approximately 19 fires were burning in the province.
After the Arctic fires in 2019, the activity in 2020 was not so surprising through June, said Mark Parrington, a senior scientist at the Copernicus Atmosphere Monitoring Service (CAMS) of the European Centre for Medium-Range Weather Forecasts. What has been surprising is the rapid increase in the scale and intensity of the fires through July, largely driven by a large cluster of active fires in the northern Sakha Republic.
Estimates show that around half of the fires in Arctic Russia this year are burning through areas with peat soildecomposed organic matter that is a large natural carbon source. Warm temperatures (such as the record-breaking heatwave in June) can thaw and dry frozen peatlands, making them highly flammable. Peat fires can burn longer than forest fires and release vast amounts of carbon into the atmosphere.
Parrington noted that fires in Arctic Russia released more carbon dioxide (CO2) in June and July 2020 alone than in any complete fire season since 2003 (when data collection began). That estimate is based on data compiled by CAMS, which incorporates data from NASAs MODIS active fire products.
The destruction of peat by fire is troubling for so many reasons, said Dorothy Peteet of NASAs Goddard Institute for Space Studies. As the fires burn off the top layers of peat, the permafrost depth may deepen, further oxidizing the underlying peat. Peteet and colleagues recently reported that the amount of carbon stored in northern peatlands is double the previous estimates.
Fires in these regions are not just releasing recent surface peat carbon, but stores that have taken 15,000 years to the accumulate, said Peteet. They also release methane, which is a more potent greenhouse gas than carbon dioxide.
If fire seasons continue to increase in severity, and possibly in seasonal extent, more peatlands will burn, said Peteet. This source of more carbon dioxide and methane to our atmosphere increases the greenhouse gas problem for us, making the planet even warmer.
NASA Earth Observatory image by Lauren Dauphin, using VIIRS data from NASA EOSDIS/LANCE and GIBS/Worldview and the Suomi National Polar-orbiting Partnership and MODIS data from NASA EOSDIS/LANCE and GIBS/Worldview. Story by Kasha Patel.
Link:
Another Intense Summer of Fires in Siberia - nasa.gov
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