Multi-year observations reveal a larger than expected autumn respiration signal across northeast Eurasia
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-base...
Published in: | Biogeosciences |
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Copernicus Publications
2022
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00063083 2023-05-15T15:12:44+02:00 Multi-year observations reveal a larger than expected autumn respiration signal across northeast Eurasia Byrne, Brendan Liu, Junjie Yi, Yonghong Chatterjee, Abhishek Basu, Sourish Cheng, Rui Doughty, Russell Chevallier, Frédéric Bowman, Kevin W. Parazoo, Nicholas C. Crisp, David Li, Xing Xiao, Jingfeng Sitch, Stephen Guenet, Bertrand Deng, Feng Johnson, Matthew S. Philip, Sajeev McGuire, Patrick C. Miller, Charles E. 2022-10 electronic https://doi.org/10.5194/bg-19-4779-2022 https://noa.gwlb.de/receive/cop_mods_00063083 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00062223/bg-19-4779-2022.pdf https://bg.copernicus.org/articles/19/4779/2022/bg-19-4779-2022.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-19-4779-2022 https://noa.gwlb.de/receive/cop_mods_00063083 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00062223/bg-19-4779-2022.pdf https://bg.copernicus.org/articles/19/4779/2022/bg-19-4779-2022.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/bg-19-4779-2022 2022-10-23T23:12:06Z 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. Article in Journal/Newspaper Arctic permafrost Niedersächsisches Online-Archiv NOA Arctic Biogeosciences 19 19 4779 4799 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Byrne, Brendan Liu, Junjie Yi, Yonghong Chatterjee, Abhishek Basu, Sourish Cheng, Rui Doughty, Russell Chevallier, Frédéric Bowman, Kevin W. Parazoo, Nicholas C. Crisp, David Li, Xing Xiao, Jingfeng Sitch, Stephen Guenet, Bertrand Deng, Feng Johnson, Matthew S. Philip, Sajeev McGuire, Patrick C. Miller, Charles E. Multi-year observations reveal a larger than expected autumn respiration signal across northeast Eurasia |
topic_facet |
article Verlagsveröffentlichung |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Byrne, Brendan Liu, Junjie Yi, Yonghong Chatterjee, Abhishek Basu, Sourish Cheng, Rui Doughty, Russell Chevallier, Frédéric Bowman, Kevin W. Parazoo, Nicholas C. Crisp, David Li, Xing Xiao, Jingfeng Sitch, Stephen Guenet, Bertrand Deng, Feng Johnson, Matthew S. Philip, Sajeev McGuire, Patrick C. Miller, Charles E. |
author_facet |
Byrne, Brendan Liu, Junjie Yi, Yonghong Chatterjee, Abhishek Basu, Sourish Cheng, Rui Doughty, Russell Chevallier, Frédéric Bowman, Kevin W. Parazoo, Nicholas C. Crisp, David Li, Xing Xiao, Jingfeng Sitch, Stephen Guenet, Bertrand Deng, Feng Johnson, Matthew S. Philip, Sajeev McGuire, Patrick C. Miller, Charles E. |
author_sort |
Byrne, Brendan |
title |
Multi-year observations reveal a larger than expected autumn respiration signal across northeast Eurasia |
title_short |
Multi-year observations reveal a larger than expected autumn respiration signal across northeast Eurasia |
title_full |
Multi-year observations reveal a larger than expected autumn respiration signal across northeast Eurasia |
title_fullStr |
Multi-year observations reveal a larger than expected autumn respiration signal across northeast Eurasia |
title_full_unstemmed |
Multi-year observations reveal a larger than expected autumn respiration signal across northeast Eurasia |
title_sort |
multi-year observations reveal a larger than expected autumn respiration signal across northeast eurasia |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/bg-19-4779-2022 https://noa.gwlb.de/receive/cop_mods_00063083 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00062223/bg-19-4779-2022.pdf https://bg.copernicus.org/articles/19/4779/2022/bg-19-4779-2022.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost |
genre_facet |
Arctic permafrost |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-19-4779-2022 https://noa.gwlb.de/receive/cop_mods_00063083 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00062223/bg-19-4779-2022.pdf https://bg.copernicus.org/articles/19/4779/2022/bg-19-4779-2022.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-19-4779-2022 |
container_title |
Biogeosciences |
container_volume |
19 |
container_issue |
19 |
container_start_page |
4779 |
op_container_end_page |
4799 |
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