Wetland methane emissions during the Last Glacial Maximum estimated from PMIP2 simulations: Climate, vegetation, and geographic controls
[1] It is an open question to what extent wetlands contributed to the interglacial‐glacial decrease in atmospheric methane concentration. Here we estimate methane emissions from glacial wetlands, using newly available PMIP2 simulations of the Last Glacial Maximum (LGM) climate from coupled atmospher...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:10076966 2023-12-24T10:17:33+01:00 Wetland methane emissions during the Last Glacial Maximum estimated from PMIP2 simulations: Climate, vegetation, and geographic controls Weber, SL Drury, AJ Toonen, WHJ van Weele, M 2010-03-27 text https://discovery.ucl.ac.uk/id/eprint/10076966/7/Drury_Wetland%20methane%20emissions%20during%20the%20Last%20Glacial%20Maximum%20estimated%20from%20PMIP2%20simulations_VoR.pdf https://discovery.ucl.ac.uk/id/eprint/10076966/ eng eng AMER GEOPHYSICAL UNION https://discovery.ucl.ac.uk/id/eprint/10076966/7/Drury_Wetland%20methane%20emissions%20during%20the%20Last%20Glacial%20Maximum%20estimated%20from%20PMIP2%20simulations_VoR.pdf https://discovery.ucl.ac.uk/id/eprint/10076966/ open Journal of Geophysical Research: Atmospheres , 115 (D6) , Article D06111. (2010) wetlands global modeling glacial‐interglacial Article 2010 ftucl 2023-11-27T13:07:31Z [1] It is an open question to what extent wetlands contributed to the interglacial‐glacial decrease in atmospheric methane concentration. Here we estimate methane emissions from glacial wetlands, using newly available PMIP2 simulations of the Last Glacial Maximum (LGM) climate from coupled atmosphere‐ocean and atmosphere‐ocean‐vegetation models. These simulations apply improved boundary conditions resulting in better agreement with paleoclimatic data than earlier PMIP1 simulations. Emissions are computed from the dominant controls of water table depth, soil temperature, and plant productivity, and we analyze the relative role of each factor in the glacial decline. It is found that latitudinal changes in soil moisture, in combination with ice sheet expansion, cause boreal wetlands to shift southward in all simulations. This southward migration is instrumental in maintaining the boreal wetland source at a significant level. The mean emission temperature over boreal wetlands drops by only a few degrees, despite the strong overall cooling. The temperature effect on the glacial decline in the methane flux is therefore moderate, while reduced plant productivity contributes equally to the total reduction. Model results indicate a relatively small boreal and large tropical source during the LGM, with wetlands on the exposed continental shelves mainly contributing to the tropical source. This distribution in emissions is consistent with the low interpolar difference in glacial methane concentrations derived from ice core data. Article in Journal/Newspaper ice core Ice Sheet University College London: UCL Discovery |
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Open Polar |
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University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
topic |
wetlands global modeling glacial‐interglacial |
spellingShingle |
wetlands global modeling glacial‐interglacial Weber, SL Drury, AJ Toonen, WHJ van Weele, M Wetland methane emissions during the Last Glacial Maximum estimated from PMIP2 simulations: Climate, vegetation, and geographic controls |
topic_facet |
wetlands global modeling glacial‐interglacial |
description |
[1] It is an open question to what extent wetlands contributed to the interglacial‐glacial decrease in atmospheric methane concentration. Here we estimate methane emissions from glacial wetlands, using newly available PMIP2 simulations of the Last Glacial Maximum (LGM) climate from coupled atmosphere‐ocean and atmosphere‐ocean‐vegetation models. These simulations apply improved boundary conditions resulting in better agreement with paleoclimatic data than earlier PMIP1 simulations. Emissions are computed from the dominant controls of water table depth, soil temperature, and plant productivity, and we analyze the relative role of each factor in the glacial decline. It is found that latitudinal changes in soil moisture, in combination with ice sheet expansion, cause boreal wetlands to shift southward in all simulations. This southward migration is instrumental in maintaining the boreal wetland source at a significant level. The mean emission temperature over boreal wetlands drops by only a few degrees, despite the strong overall cooling. The temperature effect on the glacial decline in the methane flux is therefore moderate, while reduced plant productivity contributes equally to the total reduction. Model results indicate a relatively small boreal and large tropical source during the LGM, with wetlands on the exposed continental shelves mainly contributing to the tropical source. This distribution in emissions is consistent with the low interpolar difference in glacial methane concentrations derived from ice core data. |
format |
Article in Journal/Newspaper |
author |
Weber, SL Drury, AJ Toonen, WHJ van Weele, M |
author_facet |
Weber, SL Drury, AJ Toonen, WHJ van Weele, M |
author_sort |
Weber, SL |
title |
Wetland methane emissions during the Last Glacial Maximum estimated from PMIP2 simulations: Climate, vegetation, and geographic controls |
title_short |
Wetland methane emissions during the Last Glacial Maximum estimated from PMIP2 simulations: Climate, vegetation, and geographic controls |
title_full |
Wetland methane emissions during the Last Glacial Maximum estimated from PMIP2 simulations: Climate, vegetation, and geographic controls |
title_fullStr |
Wetland methane emissions during the Last Glacial Maximum estimated from PMIP2 simulations: Climate, vegetation, and geographic controls |
title_full_unstemmed |
Wetland methane emissions during the Last Glacial Maximum estimated from PMIP2 simulations: Climate, vegetation, and geographic controls |
title_sort |
wetland methane emissions during the last glacial maximum estimated from pmip2 simulations: climate, vegetation, and geographic controls |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2010 |
url |
https://discovery.ucl.ac.uk/id/eprint/10076966/7/Drury_Wetland%20methane%20emissions%20during%20the%20Last%20Glacial%20Maximum%20estimated%20from%20PMIP2%20simulations_VoR.pdf https://discovery.ucl.ac.uk/id/eprint/10076966/ |
genre |
ice core Ice Sheet |
genre_facet |
ice core Ice Sheet |
op_source |
Journal of Geophysical Research: Atmospheres , 115 (D6) , Article D06111. (2010) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/10076966/7/Drury_Wetland%20methane%20emissions%20during%20the%20Last%20Glacial%20Maximum%20estimated%20from%20PMIP2%20simulations_VoR.pdf https://discovery.ucl.ac.uk/id/eprint/10076966/ |
op_rights |
open |
_version_ |
1786205775088058368 |