Limited response of peatland CH4 emissions to abrupt Atlantic Ocean circulation changes in glacial climates
Ice-core records show that abrupt Dansgaard–Oeschger (D–O) climatic warming events of the last glacial period were accompanied by large increases in the atmospheric CH4 concentration (up to 200 ppbv). These abrupt changes are generally regarded as arising from the effects of changes in the Atlantic...
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Copernicus Publications
2014
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00020705 2023-05-15T16:30:13+02:00 Limited response of peatland CH4 emissions to abrupt Atlantic Ocean circulation changes in glacial climates Hopcroft, P. O. Valdes, P. J. Wania, R. Beerling, D. J. 2014-01 electronic https://doi.org/10.5194/cp-10-137-2014 https://noa.gwlb.de/receive/cop_mods_00020705 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00020660/cp-10-137-2014.pdf https://cp.copernicus.org/articles/10/137/2014/cp-10-137-2014.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-10-137-2014 https://noa.gwlb.de/receive/cop_mods_00020705 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00020660/cp-10-137-2014.pdf https://cp.copernicus.org/articles/10/137/2014/cp-10-137-2014.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2014 ftnonlinearchiv https://doi.org/10.5194/cp-10-137-2014 2022-02-08T22:52:00Z Ice-core records show that abrupt Dansgaard–Oeschger (D–O) climatic warming events of the last glacial period were accompanied by large increases in the atmospheric CH4 concentration (up to 200 ppbv). These abrupt changes are generally regarded as arising from the effects of changes in the Atlantic Ocean meridional overturning circulation and the resultant climatic impact on natural CH4 sources, in particular wetlands. We use two different ecosystem models of wetland CH4 emissions to simulate northern CH4 sources forced with coupled general circulation model simulations of five different time periods during the last glacial to investigate the potential influence of abrupt ocean circulation changes on atmospheric CH4 levels during D–O events. The simulated warming over Greenland of 7–9 °C in the different time periods is at the lower end of the range of 11–15 °C derived from ice cores, but is associated with strong impacts on the hydrological cycle, especially over the North Atlantic and Europe during winter. We find that although the sensitivity of CH4 emissions to the imposed climate varies significantly between the two ecosystem emissions models, the model simulations do not reproduce sufficient emission changes to satisfy ice-core observations of CH4 increases during abrupt events. The inclusion of permafrost physics and peatland carbon cycling in one model (LPJ-WHyMe) increases the climatic sensitivity of CH44 emissions relative to the Sheffield Dynamic Global Vegetation Model (SDGVM) model, which does not incorporate these processes. For equilibrium conditions this additional sensitivity is mostly due to differences in carbon cycle processes, whilst the increased sensitivity to the imposed abrupt warmings is also partly due to the effects of freezing on soil thermodynamics. These results suggest that alternative scenarios of climatic change could be required to explain the abrupt glacial CH4 variations, perhaps with a more dominant role for tropical wetland CH4 sources. Article in Journal/Newspaper Greenland Ice ice core North Atlantic permafrost Niedersächsisches Online-Archiv NOA Greenland Sheffield Climate of the Past 10 1 137 154 |
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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 Hopcroft, P. O. Valdes, P. J. Wania, R. Beerling, D. J. Limited response of peatland CH4 emissions to abrupt Atlantic Ocean circulation changes in glacial climates |
topic_facet |
article Verlagsveröffentlichung |
description |
Ice-core records show that abrupt Dansgaard–Oeschger (D–O) climatic warming events of the last glacial period were accompanied by large increases in the atmospheric CH4 concentration (up to 200 ppbv). These abrupt changes are generally regarded as arising from the effects of changes in the Atlantic Ocean meridional overturning circulation and the resultant climatic impact on natural CH4 sources, in particular wetlands. We use two different ecosystem models of wetland CH4 emissions to simulate northern CH4 sources forced with coupled general circulation model simulations of five different time periods during the last glacial to investigate the potential influence of abrupt ocean circulation changes on atmospheric CH4 levels during D–O events. The simulated warming over Greenland of 7–9 °C in the different time periods is at the lower end of the range of 11–15 °C derived from ice cores, but is associated with strong impacts on the hydrological cycle, especially over the North Atlantic and Europe during winter. We find that although the sensitivity of CH4 emissions to the imposed climate varies significantly between the two ecosystem emissions models, the model simulations do not reproduce sufficient emission changes to satisfy ice-core observations of CH4 increases during abrupt events. The inclusion of permafrost physics and peatland carbon cycling in one model (LPJ-WHyMe) increases the climatic sensitivity of CH44 emissions relative to the Sheffield Dynamic Global Vegetation Model (SDGVM) model, which does not incorporate these processes. For equilibrium conditions this additional sensitivity is mostly due to differences in carbon cycle processes, whilst the increased sensitivity to the imposed abrupt warmings is also partly due to the effects of freezing on soil thermodynamics. These results suggest that alternative scenarios of climatic change could be required to explain the abrupt glacial CH4 variations, perhaps with a more dominant role for tropical wetland CH4 sources. |
format |
Article in Journal/Newspaper |
author |
Hopcroft, P. O. Valdes, P. J. Wania, R. Beerling, D. J. |
author_facet |
Hopcroft, P. O. Valdes, P. J. Wania, R. Beerling, D. J. |
author_sort |
Hopcroft, P. O. |
title |
Limited response of peatland CH4 emissions to abrupt Atlantic Ocean circulation changes in glacial climates |
title_short |
Limited response of peatland CH4 emissions to abrupt Atlantic Ocean circulation changes in glacial climates |
title_full |
Limited response of peatland CH4 emissions to abrupt Atlantic Ocean circulation changes in glacial climates |
title_fullStr |
Limited response of peatland CH4 emissions to abrupt Atlantic Ocean circulation changes in glacial climates |
title_full_unstemmed |
Limited response of peatland CH4 emissions to abrupt Atlantic Ocean circulation changes in glacial climates |
title_sort |
limited response of peatland ch4 emissions to abrupt atlantic ocean circulation changes in glacial climates |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/cp-10-137-2014 https://noa.gwlb.de/receive/cop_mods_00020705 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00020660/cp-10-137-2014.pdf https://cp.copernicus.org/articles/10/137/2014/cp-10-137-2014.pdf |
geographic |
Greenland Sheffield |
geographic_facet |
Greenland Sheffield |
genre |
Greenland Ice ice core North Atlantic permafrost |
genre_facet |
Greenland Ice ice core North Atlantic permafrost |
op_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-10-137-2014 https://noa.gwlb.de/receive/cop_mods_00020705 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00020660/cp-10-137-2014.pdf https://cp.copernicus.org/articles/10/137/2014/cp-10-137-2014.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-10-137-2014 |
container_title |
Climate of the Past |
container_volume |
10 |
container_issue |
1 |
container_start_page |
137 |
op_container_end_page |
154 |
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1766019939299229696 |