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Satellite-detected large CO2 release in southwestern North America during the 2020–2021 drought and associated wildfires
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Satellite-detected large CO2 release in southwestern North America during the 2020–2021 drought and associated wildfires
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Journal Article
Satellite-detected large CO2 release in southwestern North America during the 2020–2021 drought and associated wildfires
2024
Overview
Southwestern North America (SWNA) continuously experienced megadroughts and large wildfires in 2020 and 2021. Here, we quantified their impact on the terrestrial carbon budget using net biome production (NBP) estimates from an ensemble of atmospheric inversions assimilating in-situ CO2 and Carbon Observatory–2 (OCO-2) satellite XCO2 retrievals (OCO-2 v10 MIP Extension), two satellite-based gross primary production (GPP) datasets, and two fire CO2 emission datasets. We found that the 2020–2021 drought and associated wildfires in SWNA led to a large CO2 loss, an ensemble mean of 95.07 TgC estimated by the satellite inversions using both nadir and glint XCO2 retrievals (LNLG) within the OCO-2 v10 MIP, greater than 80% of SWNA’s annual total carbon sink. Moreover, the carbon loss in 2020 was mainly contributed by fire emissions while in 2021 mainly contributed by drought impacts on terrestrial carbon uptake. In addition, the satellite inversions indicated the huge carbon loss was mainly contributed by fire emissions from forests and grasslands along with carbon uptake reductions due to drought impacts on grasslands and shrublands. This study provides a process understanding of how some droughts and following wildfires affect the terrestrial carbon budget on a regional scale.
Publisher
IOP Publishing
Subject
[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment
/ [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere
/ Carbon
/ Continental interfaces, environment
/ Datasets
/ Drought
/ emission
/ Environmental technology. Sanitary engineering
/ GE1-350
/ Glint
/ Physics
/ Q
/ QC1-999
/ Science
/ TD1-1066
