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Article Dans Une Revue Environmental Research Letters Année : 2024

Satellite-detected large CO2 release in southwestern North America during the 2020–2021 drought and associated wildfires

Hui Chen
Wei He
Jinxiu Liu
Ngoc Tu Nguyen
Hua Yang
Yiming Lv
Chengcheng Huang
Christian Rödenbeck
Scot M Miller
Fei Jiang
Junjie Liu
Matthew S Johnson
Sajeev Philip
Zhiqiang Liu
Ning Zeng
Sourish Basu
David F Baker
  • Fonction : Auteur

Résumé

Abstract 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 CO 2 and Carbon Observatory – 2 (OCO-2) satellite XCO 2 retrievals (OCO-2 v10 MIP Extension), two satellite-based gross primary production (GPP) datasets, and two fire CO 2 emission datasets. We found that the 2020 – 2021 drought and associated wildfires in SWNA led to a large CO 2 loss, an ensemble mean of 95.07 TgC estimated by the satellite inversions using both nadir and glint XCO 2 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.
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Dates et versions

hal-04572939 , version 1 (13-05-2024)

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Hui Chen, Wei He, Jinxiu Liu, Ngoc Tu Nguyen, Frédéric Chevallier, et al.. Satellite-detected large CO2 release in southwestern North America during the 2020–2021 drought and associated wildfires. Environmental Research Letters, 2024, 19 (5), pp.054047. ⟨10.1088/1748-9326/ad3cf7⟩. ⟨hal-04572939⟩
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