Rates and radiocarbon content of summer ecosystem respiration in response to long-term deeper snow in the High Arctic of NW Greenland
The amount and timing of snow cover control the cycling of carbon (C), water, and energy in arctic ecosystems. The implications of changing snow cover for regional C budgets, biogeochemistry, hydrology, and albedo due to climate change are rudimentary, especially for the High Arctic. In a polar semi...
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Language: | English |
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ftcdlib:qt42z6w12h 2023-05-15T13:11:28+02:00 Rates and radiocarbon content of summer ecosystem respiration in response to long-term deeper snow in the High Arctic of NW Greenland Lupascu, M Welker, JM Xu, X Czimczik, CI 1180 - 1194 2014-01-01 application/pdf http://www.escholarship.org/uc/item/42z6w12h english eng eScholarship, University of California qt42z6w12h http://www.escholarship.org/uc/item/42z6w12h Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Lupascu, M; Welker, JM; Xu, X; & Czimczik, CI. (2014). Rates and radiocarbon content of summer ecosystem respiration in response to long-term deeper snow in the High Arctic of NW Greenland. Journal of Geophysical Research: Biogeosciences, 119(6), 1180 - 1194. doi:10.1002/2013JG002494. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/42z6w12h article 2014 ftcdlib https://doi.org/10.1002/2013JG002494 2018-07-06T22:52:23Z The amount and timing of snow cover control the cycling of carbon (C), water, and energy in arctic ecosystems. The implications of changing snow cover for regional C budgets, biogeochemistry, hydrology, and albedo due to climate change are rudimentary, especially for the High Arctic. In a polar semidesert of NW Greenland, we used a ~10-year old snow manipulation experiment to quantify how deeper snow affects magnitude, seasonality, and14C content of summer C emissions. We monitored ecosystem respiration (Reco), soil CO2, and their14C contents over three summers in vegetated and bare areas. Additional snowpack, elevated soil water content (SWC), and temperature throughout the growing season in vegetated, but not in bare, areas. Daily Recowas positively correlated to temperature, but negatively correlated to SWC; consequently, we found no effect of increased snow on daily flux. Cumulative summertime Recowas not related to annual snowfall, but to water year precipitation (winter snow plus summer rain). Experimentally increased snowpack shortened the growing season length and reduced summertime Recoup to 40%. Soil CO2was older under increased snow. However, we found no effect of snow depth on the Recoage because older C emissions were masked by younger CO2produced from the litter layer or plant respiration. In the High Arctic, anticipated changes in precipitation regime associated with warming are a key uncertainty for understanding future C cycling. In polar semideserts, water year precipitation is an important driver of summertime Reco. Permafrost C is vulnerable to changes in snowpack, with a deeper snowpack-promoting decomposition of older soil C. ©2014. American Geophysical Union. All Rights Reserved. Article in Journal/Newspaper albedo Arctic Arctic Climate change Greenland permafrost University of California: eScholarship Arctic Greenland Journal of Geophysical Research: Biogeosciences 119 6 1180 1194 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
description |
The amount and timing of snow cover control the cycling of carbon (C), water, and energy in arctic ecosystems. The implications of changing snow cover for regional C budgets, biogeochemistry, hydrology, and albedo due to climate change are rudimentary, especially for the High Arctic. In a polar semidesert of NW Greenland, we used a ~10-year old snow manipulation experiment to quantify how deeper snow affects magnitude, seasonality, and14C content of summer C emissions. We monitored ecosystem respiration (Reco), soil CO2, and their14C contents over three summers in vegetated and bare areas. Additional snowpack, elevated soil water content (SWC), and temperature throughout the growing season in vegetated, but not in bare, areas. Daily Recowas positively correlated to temperature, but negatively correlated to SWC; consequently, we found no effect of increased snow on daily flux. Cumulative summertime Recowas not related to annual snowfall, but to water year precipitation (winter snow plus summer rain). Experimentally increased snowpack shortened the growing season length and reduced summertime Recoup to 40%. Soil CO2was older under increased snow. However, we found no effect of snow depth on the Recoage because older C emissions were masked by younger CO2produced from the litter layer or plant respiration. In the High Arctic, anticipated changes in precipitation regime associated with warming are a key uncertainty for understanding future C cycling. In polar semideserts, water year precipitation is an important driver of summertime Reco. Permafrost C is vulnerable to changes in snowpack, with a deeper snowpack-promoting decomposition of older soil C. ©2014. American Geophysical Union. All Rights Reserved. |
format |
Article in Journal/Newspaper |
author |
Lupascu, M Welker, JM Xu, X Czimczik, CI |
spellingShingle |
Lupascu, M Welker, JM Xu, X Czimczik, CI Rates and radiocarbon content of summer ecosystem respiration in response to long-term deeper snow in the High Arctic of NW Greenland |
author_facet |
Lupascu, M Welker, JM Xu, X Czimczik, CI |
author_sort |
Lupascu, M |
title |
Rates and radiocarbon content of summer ecosystem respiration in response to long-term deeper snow in the High Arctic of NW Greenland |
title_short |
Rates and radiocarbon content of summer ecosystem respiration in response to long-term deeper snow in the High Arctic of NW Greenland |
title_full |
Rates and radiocarbon content of summer ecosystem respiration in response to long-term deeper snow in the High Arctic of NW Greenland |
title_fullStr |
Rates and radiocarbon content of summer ecosystem respiration in response to long-term deeper snow in the High Arctic of NW Greenland |
title_full_unstemmed |
Rates and radiocarbon content of summer ecosystem respiration in response to long-term deeper snow in the High Arctic of NW Greenland |
title_sort |
rates and radiocarbon content of summer ecosystem respiration in response to long-term deeper snow in the high arctic of nw greenland |
publisher |
eScholarship, University of California |
publishDate |
2014 |
url |
http://www.escholarship.org/uc/item/42z6w12h |
op_coverage |
1180 - 1194 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
albedo Arctic Arctic Climate change Greenland permafrost |
genre_facet |
albedo Arctic Arctic Climate change Greenland permafrost |
op_source |
Lupascu, M; Welker, JM; Xu, X; & Czimczik, CI. (2014). Rates and radiocarbon content of summer ecosystem respiration in response to long-term deeper snow in the High Arctic of NW Greenland. Journal of Geophysical Research: Biogeosciences, 119(6), 1180 - 1194. doi:10.1002/2013JG002494. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/42z6w12h |
op_relation |
qt42z6w12h http://www.escholarship.org/uc/item/42z6w12h |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1002/2013JG002494 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
119 |
container_issue |
6 |
container_start_page |
1180 |
op_container_end_page |
1194 |
_version_ |
1766247539017777152 |