Trends in CO2 exchange in a high Arctic tundra heath, 2000-2010
We have measured the land-atmosphere CO2 exchange using the eddy covariance technique in a high Arctic tundra heath in northeast Greenland (Zackenberg). On the basis of 11 years of measurements (2000-2010), it was found that snow cover dynamics was important for the CO2 exchange. The start of CO2 up...
Published in: | Journal of Geophysical Research: Biogeosciences |
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Online Access: | https://lup.lub.lu.se/record/2574747 https://doi.org/10.1029/2011JG001901 |
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ftulundlup:oai:lup.lub.lu.se:0b78f1e2-8077-4cb5-a565-3afd0df267dc 2023-05-15T14:51:52+02:00 Trends in CO2 exchange in a high Arctic tundra heath, 2000-2010 Lund, Magnus Falk, Julie Maria Friborg, Thomas Mbufong, Herbert N. Sigsgaard, Charlotte Soegaard, Henrik Tamstorf, Mikkel P. 2012 https://lup.lub.lu.se/record/2574747 https://doi.org/10.1029/2011JG001901 eng eng Wiley-Blackwell https://lup.lub.lu.se/record/2574747 http://dx.doi.org/10.1029/2011JG001901 wos:000302529000001 scopus:84859702142 Journal of Geophysical Research; 117 (2012) ISSN: 2156-2202 Physical Geography contributiontojournal/article info:eu-repo/semantics/article text 2012 ftulundlup https://doi.org/10.1029/2011JG001901 2023-02-01T23:29:48Z We have measured the land-atmosphere CO2 exchange using the eddy covariance technique in a high Arctic tundra heath in northeast Greenland (Zackenberg). On the basis of 11 years of measurements (2000-2010), it was found that snow cover dynamics was important for the CO2 exchange. The start of CO2 uptake period correlated significantly with timing of snowmelt. Furthermore, for years with deep and long-lasting snowpacks, the following springs showed increased CO2 emission rates. In the first part of the study period, there was an increase of approximately 8 g C m(-2) yr(-1) in both accumulated gross primary production (GPP) and CO2 sink strength during summer. However, in the last few years, there were no significant changes in GPP, whereas ecosystem respiration (R-eco) increased (8.5 g C m(-2) yr(-1)) and ecosystem CO2 sink strength weakened (-4.1 g C m(-2) yr(-1)). It was found that temperature and temperature-related variables (maximum thaw depth and growing degree days) controlled the interannual variation in CO2 exchange. However, while R-eco showed a steady increase with temperature (5.8 g C m(-2) degrees C-1), the initial increase in GPP with temperature leveled off at the high end of observed temperature range. This suggests that future increases in temperature will weaken the ecosystem CO2 sink strength or even turn it into a CO2 source, depending on possible changes in vegetation structure and functioning as a response to a changing climate. If this trend is applicable also to other Arctic ecosystems, it will have implications for our current understanding of Arctic ecosystems dynamics. Article in Journal/Newspaper Arctic Greenland Tundra Zackenberg Lund University Publications (LUP) Arctic Greenland Journal of Geophysical Research: Biogeosciences 117 G2 n/a n/a |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Physical Geography |
spellingShingle |
Physical Geography Lund, Magnus Falk, Julie Maria Friborg, Thomas Mbufong, Herbert N. Sigsgaard, Charlotte Soegaard, Henrik Tamstorf, Mikkel P. Trends in CO2 exchange in a high Arctic tundra heath, 2000-2010 |
topic_facet |
Physical Geography |
description |
We have measured the land-atmosphere CO2 exchange using the eddy covariance technique in a high Arctic tundra heath in northeast Greenland (Zackenberg). On the basis of 11 years of measurements (2000-2010), it was found that snow cover dynamics was important for the CO2 exchange. The start of CO2 uptake period correlated significantly with timing of snowmelt. Furthermore, for years with deep and long-lasting snowpacks, the following springs showed increased CO2 emission rates. In the first part of the study period, there was an increase of approximately 8 g C m(-2) yr(-1) in both accumulated gross primary production (GPP) and CO2 sink strength during summer. However, in the last few years, there were no significant changes in GPP, whereas ecosystem respiration (R-eco) increased (8.5 g C m(-2) yr(-1)) and ecosystem CO2 sink strength weakened (-4.1 g C m(-2) yr(-1)). It was found that temperature and temperature-related variables (maximum thaw depth and growing degree days) controlled the interannual variation in CO2 exchange. However, while R-eco showed a steady increase with temperature (5.8 g C m(-2) degrees C-1), the initial increase in GPP with temperature leveled off at the high end of observed temperature range. This suggests that future increases in temperature will weaken the ecosystem CO2 sink strength or even turn it into a CO2 source, depending on possible changes in vegetation structure and functioning as a response to a changing climate. If this trend is applicable also to other Arctic ecosystems, it will have implications for our current understanding of Arctic ecosystems dynamics. |
format |
Article in Journal/Newspaper |
author |
Lund, Magnus Falk, Julie Maria Friborg, Thomas Mbufong, Herbert N. Sigsgaard, Charlotte Soegaard, Henrik Tamstorf, Mikkel P. |
author_facet |
Lund, Magnus Falk, Julie Maria Friborg, Thomas Mbufong, Herbert N. Sigsgaard, Charlotte Soegaard, Henrik Tamstorf, Mikkel P. |
author_sort |
Lund, Magnus |
title |
Trends in CO2 exchange in a high Arctic tundra heath, 2000-2010 |
title_short |
Trends in CO2 exchange in a high Arctic tundra heath, 2000-2010 |
title_full |
Trends in CO2 exchange in a high Arctic tundra heath, 2000-2010 |
title_fullStr |
Trends in CO2 exchange in a high Arctic tundra heath, 2000-2010 |
title_full_unstemmed |
Trends in CO2 exchange in a high Arctic tundra heath, 2000-2010 |
title_sort |
trends in co2 exchange in a high arctic tundra heath, 2000-2010 |
publisher |
Wiley-Blackwell |
publishDate |
2012 |
url |
https://lup.lub.lu.se/record/2574747 https://doi.org/10.1029/2011JG001901 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Tundra Zackenberg |
genre_facet |
Arctic Greenland Tundra Zackenberg |
op_source |
Journal of Geophysical Research; 117 (2012) ISSN: 2156-2202 |
op_relation |
https://lup.lub.lu.se/record/2574747 http://dx.doi.org/10.1029/2011JG001901 wos:000302529000001 scopus:84859702142 |
op_doi |
https://doi.org/10.1029/2011JG001901 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
117 |
container_issue |
G2 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766323010809102336 |