Response of methane emissions from wetlands to the Last Glacial Maximum and an idealized Dansgaard-Oeschger climate event: insights from two models of different complexity
The role of different sources and sinks of CH 4 in changes in atmospheric methane ([CH 4 ]) concentration during the last 100 000 yr is still not fully understood. In particular , the magnitude of the change in wetland CH 4 emissions at the Last Glacial Maximum (LGM) relative to the pre-industrial p...
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European Geosciences Union (EGU)
2013
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/196541 2024-09-15T18:11:59+00:00 Response of methane emissions from wetlands to the Last Glacial Maximum and an idealized Dansgaard-Oeschger climate event: insights from two models of different complexity RINGEVAL, Bruno HOPCROFT, P. VALDES, P. CIAIS, Philippe RAMSTEIN, G. DOLMAN, A. KAGEYAMA, M. 2013 https://oskar-bordeaux.fr/handle/20.500.12278/196541 https://hdl.handle.net/20.500.12278/196541 https://doi.org/10.5194/cp-9-149-2013 en eng European Geosciences Union (EGU) 1814-9324 https://oskar-bordeaux.fr/handle/20.500.12278/196541 doi:10.5194/cp-9-149-2013 http://creativecommons.org/licenses/by/ Sciences de l'environnement/Milieux et Changements globaux Planète et Univers [physics]/Sciences de la Terre/Climatologie Article de revue 2013 ftoskarbordeaux https://doi.org/20.500.12278/19654110.5194/cp-9-149-2013 2024-08-27T06:09:10Z The role of different sources and sinks of CH 4 in changes in atmospheric methane ([CH 4 ]) concentration during the last 100 000 yr is still not fully understood. In particular , the magnitude of the change in wetland CH 4 emissions at the Last Glacial Maximum (LGM) relative to the pre-industrial period (PI), as well as during abrupt climatic warming or Dansgaard–Oeschger (D–O) events of the last glacial period, is largely unconstrained. In the present study, we aim to understand the uncertainties related to the param-eterization of the wetland CH 4 emission models relevant to these time periods by using two wetland models of different complexity (SDGVM and ORCHIDEE). These models have been forced by identical climate fields from low-resolution coupled atmosphere–ocean general circulation model (FAMOUS) simulations of these time periods. Both emission models simulate a large decrease in emissions during LGM in comparison to PI consistent with ice core observations and previous modelling studies. The global reduction is much larger in ORCHIDEE than in SDGVM (respectively −67 and −46 %), and whilst the differences can be partially explained by different model sensitivities to temperature, the major reason for spatial differences between the models is the inclusion of freezing of soil water in ORCHIDEE and the resultant impact on methanogenesis substrate availability in boreal regions. Besides, a sensitivity test performed with ORCHIDEE in which the methanogenesis substrate sensitivity to the precipitations is modified to be more realistic gives a LGM reduction of −36 %. The range of the global LGM decrease is still prone to uncertainty, and here we underline its sensitivity to different process parameteri-zations. Over the course of an idealized D–O warming, the magnitude of the change in wetland CH 4 emissions simulated by the two models at global scale is very similar at around 15 Tg yr −1 , but this is only around 25 % of the ice-core measured changes in [CH 4 ]. The two models do show regional differences in ... Article in Journal/Newspaper ice core OSKAR Bordeaux (Open Science Knowledge ARchive) Climate of the Past 9 1 149 171 |
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OSKAR Bordeaux (Open Science Knowledge ARchive) |
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ftoskarbordeaux |
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English |
topic |
Sciences de l'environnement/Milieux et Changements globaux Planète et Univers [physics]/Sciences de la Terre/Climatologie |
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Sciences de l'environnement/Milieux et Changements globaux Planète et Univers [physics]/Sciences de la Terre/Climatologie RINGEVAL, Bruno HOPCROFT, P. VALDES, P. CIAIS, Philippe RAMSTEIN, G. DOLMAN, A. KAGEYAMA, M. Response of methane emissions from wetlands to the Last Glacial Maximum and an idealized Dansgaard-Oeschger climate event: insights from two models of different complexity |
topic_facet |
Sciences de l'environnement/Milieux et Changements globaux Planète et Univers [physics]/Sciences de la Terre/Climatologie |
description |
The role of different sources and sinks of CH 4 in changes in atmospheric methane ([CH 4 ]) concentration during the last 100 000 yr is still not fully understood. In particular , the magnitude of the change in wetland CH 4 emissions at the Last Glacial Maximum (LGM) relative to the pre-industrial period (PI), as well as during abrupt climatic warming or Dansgaard–Oeschger (D–O) events of the last glacial period, is largely unconstrained. In the present study, we aim to understand the uncertainties related to the param-eterization of the wetland CH 4 emission models relevant to these time periods by using two wetland models of different complexity (SDGVM and ORCHIDEE). These models have been forced by identical climate fields from low-resolution coupled atmosphere–ocean general circulation model (FAMOUS) simulations of these time periods. Both emission models simulate a large decrease in emissions during LGM in comparison to PI consistent with ice core observations and previous modelling studies. The global reduction is much larger in ORCHIDEE than in SDGVM (respectively −67 and −46 %), and whilst the differences can be partially explained by different model sensitivities to temperature, the major reason for spatial differences between the models is the inclusion of freezing of soil water in ORCHIDEE and the resultant impact on methanogenesis substrate availability in boreal regions. Besides, a sensitivity test performed with ORCHIDEE in which the methanogenesis substrate sensitivity to the precipitations is modified to be more realistic gives a LGM reduction of −36 %. The range of the global LGM decrease is still prone to uncertainty, and here we underline its sensitivity to different process parameteri-zations. Over the course of an idealized D–O warming, the magnitude of the change in wetland CH 4 emissions simulated by the two models at global scale is very similar at around 15 Tg yr −1 , but this is only around 25 % of the ice-core measured changes in [CH 4 ]. The two models do show regional differences in ... |
format |
Article in Journal/Newspaper |
author |
RINGEVAL, Bruno HOPCROFT, P. VALDES, P. CIAIS, Philippe RAMSTEIN, G. DOLMAN, A. KAGEYAMA, M. |
author_facet |
RINGEVAL, Bruno HOPCROFT, P. VALDES, P. CIAIS, Philippe RAMSTEIN, G. DOLMAN, A. KAGEYAMA, M. |
author_sort |
RINGEVAL, Bruno |
title |
Response of methane emissions from wetlands to the Last Glacial Maximum and an idealized Dansgaard-Oeschger climate event: insights from two models of different complexity |
title_short |
Response of methane emissions from wetlands to the Last Glacial Maximum and an idealized Dansgaard-Oeschger climate event: insights from two models of different complexity |
title_full |
Response of methane emissions from wetlands to the Last Glacial Maximum and an idealized Dansgaard-Oeschger climate event: insights from two models of different complexity |
title_fullStr |
Response of methane emissions from wetlands to the Last Glacial Maximum and an idealized Dansgaard-Oeschger climate event: insights from two models of different complexity |
title_full_unstemmed |
Response of methane emissions from wetlands to the Last Glacial Maximum and an idealized Dansgaard-Oeschger climate event: insights from two models of different complexity |
title_sort |
response of methane emissions from wetlands to the last glacial maximum and an idealized dansgaard-oeschger climate event: insights from two models of different complexity |
publisher |
European Geosciences Union (EGU) |
publishDate |
2013 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/196541 https://hdl.handle.net/20.500.12278/196541 https://doi.org/10.5194/cp-9-149-2013 |
genre |
ice core |
genre_facet |
ice core |
op_relation |
1814-9324 https://oskar-bordeaux.fr/handle/20.500.12278/196541 doi:10.5194/cp-9-149-2013 |
op_rights |
http://creativecommons.org/licenses/by/ |
op_doi |
https://doi.org/20.500.12278/19654110.5194/cp-9-149-2013 |
container_title |
Climate of the Past |
container_volume |
9 |
container_issue |
1 |
container_start_page |
149 |
op_container_end_page |
171 |
_version_ |
1810449579552800768 |