Large tundra methane burst during onset of freezing
Udgivelsesdato: 456 Terrestrial wetland emissions are the largest single source of the greenhouse gas methane1. Northern high-latitude wetlands contribute significantly to the overall methane emissions from wetlands, but the relative source distribution between tropical and high-latitude wetlands re...
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ftuniaarhuspubl:oai:pure.atira.dk:publications/217cd100-c177-11dd-abd8-000ea68e967b 2024-04-21T07:56:27+00:00 Large tundra methane burst during onset of freezing Mastepanov, Mikhail Sigsgaard, Charlotte Dlugokencky, Edward J. Houweling, Sander Ström, Lena Tamstorf, Mikkel Peter Christensen, Torben R. 2008 https://pure.au.dk/portal/en/publications/217cd100-c177-11dd-abd8-000ea68e967b eng eng https://pure.au.dk/portal/en/publications/217cd100-c177-11dd-abd8-000ea68e967b info:eu-repo/semantics/restrictedAccess Mastepanov , M , Sigsgaard , C , Dlugokencky , E J , Houweling , S , Ström , L , Tamstorf , M P & Christensen , T R 2008 , ' Large tundra methane burst during onset of freezing ' , Nature , pp. 628 . Metan emmisioner Arktis Grønland permafrost tundra Methane emissions Arctic Greenland cryosphere permafrost tundra article 2008 ftuniaarhuspubl 2024-03-28T00:37:21Z Udgivelsesdato: 456 Terrestrial wetland emissions are the largest single source of the greenhouse gas methane1. Northern high-latitude wetlands contribute significantly to the overall methane emissions from wetlands, but the relative source distribution between tropical and high-latitude wetlands remains uncertain2,3. As a result, not all the observed spatial and seasonal patterns of atmospheric methane concentrations can be satisfactorily explained, particularly for high northern latitudes. For example, a late-autumn shoulder is consistently observed in the seasonal cycles of atmospheric methane at high-latitude sites4, but the sources responsible for these increased methane concentrations remain uncertain. Here we report a data set that extends hourly methane flux measurements from a high Arctic setting into the late autumn and early winter, during the onset of soil freezing. We find that emissions fall to a low steady level after the growing season but then increase significantly during the freeze-in period. The integral of emissions during the freeze-in period is approximately equal to the amount of methane emitted during the entire summer season. Three-dimensional atmospheric chemistry and transport model simulations of global atmospheric methane concentrations indicate that the observed early winter emission burst improves the agreement between the simulated seasonal cycle and atmospheric data from latitudes north of 60N. Our findings suggest that permafrost-associated freeze-in bursts of methane missions from tundra regions could be an important and so far unrecognized component of the seasonal distribution of methane emissions from high latitudes. Article in Journal/Newspaper Arktis Arktis* Greenland Grønland permafrost Tundra Aarhus University: Research |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Metan emmisioner Arktis Grønland permafrost tundra Methane emissions Arctic Greenland cryosphere permafrost tundra |
spellingShingle |
Metan emmisioner Arktis Grønland permafrost tundra Methane emissions Arctic Greenland cryosphere permafrost tundra Mastepanov, Mikhail Sigsgaard, Charlotte Dlugokencky, Edward J. Houweling, Sander Ström, Lena Tamstorf, Mikkel Peter Christensen, Torben R. Large tundra methane burst during onset of freezing |
topic_facet |
Metan emmisioner Arktis Grønland permafrost tundra Methane emissions Arctic Greenland cryosphere permafrost tundra |
description |
Udgivelsesdato: 456 Terrestrial wetland emissions are the largest single source of the greenhouse gas methane1. Northern high-latitude wetlands contribute significantly to the overall methane emissions from wetlands, but the relative source distribution between tropical and high-latitude wetlands remains uncertain2,3. As a result, not all the observed spatial and seasonal patterns of atmospheric methane concentrations can be satisfactorily explained, particularly for high northern latitudes. For example, a late-autumn shoulder is consistently observed in the seasonal cycles of atmospheric methane at high-latitude sites4, but the sources responsible for these increased methane concentrations remain uncertain. Here we report a data set that extends hourly methane flux measurements from a high Arctic setting into the late autumn and early winter, during the onset of soil freezing. We find that emissions fall to a low steady level after the growing season but then increase significantly during the freeze-in period. The integral of emissions during the freeze-in period is approximately equal to the amount of methane emitted during the entire summer season. Three-dimensional atmospheric chemistry and transport model simulations of global atmospheric methane concentrations indicate that the observed early winter emission burst improves the agreement between the simulated seasonal cycle and atmospheric data from latitudes north of 60N. Our findings suggest that permafrost-associated freeze-in bursts of methane missions from tundra regions could be an important and so far unrecognized component of the seasonal distribution of methane emissions from high latitudes. |
format |
Article in Journal/Newspaper |
author |
Mastepanov, Mikhail Sigsgaard, Charlotte Dlugokencky, Edward J. Houweling, Sander Ström, Lena Tamstorf, Mikkel Peter Christensen, Torben R. |
author_facet |
Mastepanov, Mikhail Sigsgaard, Charlotte Dlugokencky, Edward J. Houweling, Sander Ström, Lena Tamstorf, Mikkel Peter Christensen, Torben R. |
author_sort |
Mastepanov, Mikhail |
title |
Large tundra methane burst during onset of freezing |
title_short |
Large tundra methane burst during onset of freezing |
title_full |
Large tundra methane burst during onset of freezing |
title_fullStr |
Large tundra methane burst during onset of freezing |
title_full_unstemmed |
Large tundra methane burst during onset of freezing |
title_sort |
large tundra methane burst during onset of freezing |
publishDate |
2008 |
url |
https://pure.au.dk/portal/en/publications/217cd100-c177-11dd-abd8-000ea68e967b |
genre |
Arktis Arktis* Greenland Grønland permafrost Tundra |
genre_facet |
Arktis Arktis* Greenland Grønland permafrost Tundra |
op_source |
Mastepanov , M , Sigsgaard , C , Dlugokencky , E J , Houweling , S , Ström , L , Tamstorf , M P & Christensen , T R 2008 , ' Large tundra methane burst during onset of freezing ' , Nature , pp. 628 . |
op_relation |
https://pure.au.dk/portal/en/publications/217cd100-c177-11dd-abd8-000ea68e967b |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1796938454087499776 |