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Multi-year observations reveal a larger than expected autumn respiration signal across northeast Eurasia

Byrne, Brendan and Liu, Junjie and Yi, Yonghong and Chatterjee, Abhishek and Basu, Sourish and Cheng, Rui and Doughty, Russell and Chevallier, Frédéric and Bowman, Kevin W. and Parazoo, Nicholas C. and Crisp, David and Li, Xing and Xiao, Jingfeng and Sitch, Stephen and Guenet, Bertrand and Deng, Feng and Johnson, Matthew S. and Philip, Sajeev and McGuire, Patrick C. and Miller, Charles E. (2022) Multi-year observations reveal a larger than expected autumn respiration signal across northeast Eurasia. Biogeosciences, 19 (19). pp. 4779-4799. ISSN 1726-4189. doi:10.5194/bg-19-4779-2022.

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Abstract. Site-level observations have shown pervasive cold season CO₂ release across Arctic and boreal ecosystems, impacting annual carbon budgets. Still, the seasonality of CO₂ emissions are poorly quantified across much of the high latitudes due to the sparse coverage of site-level observations. Space-based observations provide the opportunity to fill some observational gaps for studying these high-latitude ecosystems, particularly across poorly sampled regions of Eurasia. Here, we show that data-driven net ecosystem exchange (NEE) from atmospheric CO₂ observations implies strong summer uptake followed by strong autumn release of CO₂ over the entire cold northeastern region of Eurasia during the 2015–2019 study period. Combining data-driven NEE with satellite-based estimates of gross primary production (GPP), we show that this seasonality implies less summer heterotrophic respiration (Rₕ) and greater autumn Rₕ than would be expected given an exponential relationship between respiration and surface temperature. Furthermore, we show that this seasonality of NEE and Rₕ over northeastern Eurasia is not captured by the TRENDY v8 ensemble of dynamic global vegetation models (DGVMs), which estimate that 47%–57% (interquartile range) of annual Rₕ occurs during August–April, while the data-driven estimates suggest 59%–76% of annual Rₕ occurs over this period. We explain this seasonal shift in Rₕ by respiration from soils at depth during the zero-curtain period, when sub-surface soils remain unfrozen up to several months after the surface has frozen. Additional impacts of physical processes related to freeze–thaw dynamics may contribute to the seasonality of Rₕ. This study confirms a significant and spatially extensive early cold season CO₂ efflux in the permafrost-rich region of northeast Eurasia and suggests that autumn Rₕ from subsurface soils in the northern high latitudes is not well captured by current DGVMs.

Item Type:Article
Related URLs:
URLURL TypeDescription
Byrne, Brendan0000-0003-0619-3045
Liu, Junjie0000-0002-7184-6594
Chatterjee, Abhishek0000-0002-3680-0160
Basu, Sourish0000-0001-8605-5894
Cheng, Rui0000-0002-3003-8339
Doughty, Russell0000-0001-5191-2155
Chevallier, Frédéric0000-0002-4327-3813
Bowman, Kevin W.0000-0002-8659-1117
Parazoo, Nicholas C.0000-0002-4424-7780
Crisp, David0000-0002-4573-9998
Xiao, Jingfeng0000-0002-0622-6903
Sitch, Stephen0000-0003-1821-8561
Guenet, Bertrand0000-0002-4311-8645
Deng, Feng0000-0002-1381-0243
Johnson, Matthew S.0000-0002-6010-7497
Philip, Sajeev0000-0002-5456-7593
McGuire, Patrick C.0000-0001-6592-4966
Miller, Charles E.0000-0002-9380-4838
Additional Information:Brendan Byrne and Junjie Liu were supported by the NASA OCO2/3 science team program NNH17ZDA001N‐OCO2. Abhishek Chatterjee, Brendan Byrne, Junjie Liu, and Sourish Basu were also supported by the NASA OCO Science Team Grant #80NSSC21K1068. Charles E. Miller was supported by NASA's Arctic Boreal Vulnerability Experiment (ABoVE) under NNH18ZDA001N‐TE. Jingfeng Xiao was supported by the National Science Foundation (NSF) (Macrosystem Biology & NEON-Enabled Science program: DEB-2017870). Matthew S. Johnson acknowledges the internal funding from NASA's Earth Science Research and Analysis Program. Sajeev Philip acknowledges financial support of the NASA Academic Mission Services by Universities Space Research Association at NASA Ames Research Center. Frédéric Chevallier was funded by the Copernicus Atmosphere Monitoring Service, implemented by the European Centre for Medium-Range Weather Forecasts on behalf of the European Commission (grant no. CAMS73). The research carried out at the Jet Propulsion Laboratory, California Institute of Technology, was under a contract with the National Aeronautics and Space Administration. Resources supporting this work were provided by the NASA High‐End Computing (HEC) program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center. Frédéric Chevallier was granted access to the HPC resources of TGCC under the allocation A0110102201 made by GENCI. The ODIAC project is supported by Greenhouse Gas Observing SATellite (GOSAT) project, National Institute for Environmental Studies (NIES), Japan. This research has been supported by the National Aeronautics and Space Administration (grant nos. 80NSSC21K1068, NNH17ZDA001N-OCO2, and NNH18ZDA001N-TE).
Funding AgencyGrant Number
European CommissionCAMS73
National Institute for Environmental Studies (Japan)UNSPECIFIED
Issue or Number:19
Record Number:CaltechAUTHORS:20221021-259555500.10
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117525
Deposited By: Research Services Depository
Deposited On:27 Oct 2022 18:22
Last Modified:27 Oct 2022 18:22

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