Exchange of CO2 in Arctic tundra: impacts of meteorological variations and biological disturbance
An improvement in our process-based understanding of carbon (C) exchange in the Arctic and its climate sensitivity is critically needed for understanding the response of tundra ecosystems to a changing climate. In this context, we analysed the net ecosystem exchange (NEE) of CO2 in West Greenland tu...
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Copernicus Publications
2017
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00008418 2023-05-15T15:01:49+02:00 Exchange of CO2 in Arctic tundra: impacts of meteorological variations and biological disturbance López-Blanco, Efrén Lund, Magnus Williams, Mathew Tamstorf, Mikkel P. Westergaard-Nielsen, Andreas Exbrayat, Jean-François Hansen, Birger U. Christensen, Torben R. 2017-10 electronic https://doi.org/10.5194/bg-14-4467-2017 https://noa.gwlb.de/receive/cop_mods_00008418 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00008375/bg-14-4467-2017.pdf https://bg.copernicus.org/articles/14/4467/2017/bg-14-4467-2017.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-14-4467-2017 https://noa.gwlb.de/receive/cop_mods_00008418 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00008375/bg-14-4467-2017.pdf https://bg.copernicus.org/articles/14/4467/2017/bg-14-4467-2017.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2017 ftnonlinearchiv https://doi.org/10.5194/bg-14-4467-2017 2022-02-08T22:58:02Z An improvement in our process-based understanding of carbon (C) exchange in the Arctic and its climate sensitivity is critically needed for understanding the response of tundra ecosystems to a changing climate. In this context, we analysed the net ecosystem exchange (NEE) of CO2 in West Greenland tundra (64° N) across eight snow-free periods in 8 consecutive years, and characterized the key processes of net ecosystem exchange and its two main modulating components: gross primary production (GPP) and ecosystem respiration (Reco). Overall, the ecosystem acted as a consistent sink of CO2, accumulating −30 g C m−2 on average (range of −17 to −41 g C m−2) during the years 2008–2015, except 2011 (source of 41 g C m−2), which was associated with a major pest outbreak. The results do not reveal a marked meteorological effect on the net CO2 uptake despite the high interannual variability in the timing of snowmelt and the start and duration of the growing season. The ranges in annual GPP (−182 to −316 g C m−2) and Reco (144 to 279 g C m−2) were > 5 fold larger than the range in NEE. Gross fluxes were also more variable (coefficients of variation are 3.6 and 4.1 % respectively) than for NEE (0.7 %). GPP and Reco were sensitive to insolation and temperature, and there was a tendency towards larger GPP and Reco during warmer and wetter years. The relative lack of sensitivity of NEE to meteorology was a result of the correlated response of GPP and Reco. During the snow-free season of the anomalous year of 2011, a biological disturbance related to a larvae outbreak reduced GPP more strongly than Reco. With continued warming temperatures and longer growing seasons, tundra systems will increase rates of C cycling. However, shifts in sink strength will likely be triggered by factors such as biological disturbances, events that will challenge our forecasting of C states. Article in Journal/Newspaper Arctic Greenland Tundra Niedersächsisches Online-Archiv NOA Arctic Greenland Biogeosciences 14 19 4467 4483 |
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Niedersächsisches Online-Archiv NOA |
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language |
English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung López-Blanco, Efrén Lund, Magnus Williams, Mathew Tamstorf, Mikkel P. Westergaard-Nielsen, Andreas Exbrayat, Jean-François Hansen, Birger U. Christensen, Torben R. Exchange of CO2 in Arctic tundra: impacts of meteorological variations and biological disturbance |
topic_facet |
article Verlagsveröffentlichung |
description |
An improvement in our process-based understanding of carbon (C) exchange in the Arctic and its climate sensitivity is critically needed for understanding the response of tundra ecosystems to a changing climate. In this context, we analysed the net ecosystem exchange (NEE) of CO2 in West Greenland tundra (64° N) across eight snow-free periods in 8 consecutive years, and characterized the key processes of net ecosystem exchange and its two main modulating components: gross primary production (GPP) and ecosystem respiration (Reco). Overall, the ecosystem acted as a consistent sink of CO2, accumulating −30 g C m−2 on average (range of −17 to −41 g C m−2) during the years 2008–2015, except 2011 (source of 41 g C m−2), which was associated with a major pest outbreak. The results do not reveal a marked meteorological effect on the net CO2 uptake despite the high interannual variability in the timing of snowmelt and the start and duration of the growing season. The ranges in annual GPP (−182 to −316 g C m−2) and Reco (144 to 279 g C m−2) were > 5 fold larger than the range in NEE. Gross fluxes were also more variable (coefficients of variation are 3.6 and 4.1 % respectively) than for NEE (0.7 %). GPP and Reco were sensitive to insolation and temperature, and there was a tendency towards larger GPP and Reco during warmer and wetter years. The relative lack of sensitivity of NEE to meteorology was a result of the correlated response of GPP and Reco. During the snow-free season of the anomalous year of 2011, a biological disturbance related to a larvae outbreak reduced GPP more strongly than Reco. With continued warming temperatures and longer growing seasons, tundra systems will increase rates of C cycling. However, shifts in sink strength will likely be triggered by factors such as biological disturbances, events that will challenge our forecasting of C states. |
format |
Article in Journal/Newspaper |
author |
López-Blanco, Efrén Lund, Magnus Williams, Mathew Tamstorf, Mikkel P. Westergaard-Nielsen, Andreas Exbrayat, Jean-François Hansen, Birger U. Christensen, Torben R. |
author_facet |
López-Blanco, Efrén Lund, Magnus Williams, Mathew Tamstorf, Mikkel P. Westergaard-Nielsen, Andreas Exbrayat, Jean-François Hansen, Birger U. Christensen, Torben R. |
author_sort |
López-Blanco, Efrén |
title |
Exchange of CO2 in Arctic tundra: impacts of meteorological variations and biological disturbance |
title_short |
Exchange of CO2 in Arctic tundra: impacts of meteorological variations and biological disturbance |
title_full |
Exchange of CO2 in Arctic tundra: impacts of meteorological variations and biological disturbance |
title_fullStr |
Exchange of CO2 in Arctic tundra: impacts of meteorological variations and biological disturbance |
title_full_unstemmed |
Exchange of CO2 in Arctic tundra: impacts of meteorological variations and biological disturbance |
title_sort |
exchange of co2 in arctic tundra: impacts of meteorological variations and biological disturbance |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/bg-14-4467-2017 https://noa.gwlb.de/receive/cop_mods_00008418 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00008375/bg-14-4467-2017.pdf https://bg.copernicus.org/articles/14/4467/2017/bg-14-4467-2017.pdf |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Tundra |
genre_facet |
Arctic Greenland Tundra |
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-14-4467-2017 https://noa.gwlb.de/receive/cop_mods_00008418 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00008375/bg-14-4467-2017.pdf https://bg.copernicus.org/articles/14/4467/2017/bg-14-4467-2017.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-14-4467-2017 |
container_title |
Biogeosciences |
container_volume |
14 |
container_issue |
19 |
container_start_page |
4467 |
op_container_end_page |
4483 |
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1766333826099838976 |