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Climate-CH<sub>4</sub> feedback from wetlands and its interaction with the climate-CO<sub>2</sub> feedback

hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorRINGEVAL, Bruno
hal.structure.identifierLaboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
hal.structure.identifierCollege of Engineering, Mathematics and Physical Sciences [Exeter] [EMPS]
dc.contributor.authorFRIEDLINGSTEIN, P.
hal.structure.identifierLawrence Berkeley National Laboratory [Berkeley] [LBNL]
hal.structure.identifierLaboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
dc.contributor.authorKOVEN, C.
hal.structure.identifierLaboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
hal.structure.identifierICOS-ATC [ICOS-ATC]
dc.contributor.authorCIAIS, Philippe
hal.structure.identifierLaboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
hal.structure.identifierExtrèmes : Statistiques, Impacts et Régionalisation [ESTIMR]
dc.contributor.authorDE NOBLET-DUCOUDRÉ, N.
hal.structure.identifierCentre national de recherches météorologiques [CNRM]
dc.contributor.authorDECHARME, B.
hal.structure.identifierLaboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
dc.contributor.authorCADULE, P.
dc.date.accessioned2024-04-08T12:08:47Z
dc.date.available2024-04-08T12:08:47Z
dc.date.issued2011
dc.identifier.issn1726-4170
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196539
dc.description.abstractEnThe existence of a feedback between climate and methane (CH 4) emissions from wetlands has previously been hypothesized, but both its sign and amplitude remain unknown. Moreover, this feedback could interact with the climate-CO 2 cycle feedback, which has not yet been accounted for at the global scale. These interactions relate to (i) the effect of atmospheric CO 2 on methanogenic substrates by virtue of its fertilizing effect on plant productivity and (ii) the fact that a climate perturbation due to CO 2 (respectively CH 4) radiative forcing has an effect on wetland CH 4 emissions (respectively CO 2 fluxes at the surface/atmosphere interface). We present a theoretical analysis of these interactions, which makes it possible to express the magnitude of the feedback for CO 2 and CH 4 alone, the additional gain due to interactions between these two feedbacks and the effects of these feedbacks on the difference in atmospheric CH 4 and CO 2 between 2100 and pre-industrial time (respectively CH 4 and CO 2). These gains are expressed as functions of different sensitivity terms, which we estimate based on prior studies and from experiments performed with the global terrestrial vegetation model ORCHIDEE. Despite high uncertainties on the sensitivity of wetland CH 4 emissions to climate, we found that the absolute value of the gain of the climate-CH 4 feedback from wetlands is relatively low (<30 % of climate-CO 2 feedback gain), with either negative or positive sign within the range of estimates. Whereas the interactions between the two feedbacks have low influence on CO 2 , the CH 4 could increase by 475 to 1400 ppb based on the sign of the C-CH 4 feedback gain. Our study suggests that it is necessary to better constrain the evolution of wetland area under future climate change as well as the local coupling through methanogenesis substrate of the carbon and CH 4 cycles – in particular the magnitude of the CO 2 fertilization effect on the wetland CH 4 emissions – as these are the dominant sources of uncertainty in our model.
dc.language.isoen
dc.publisherEuropean Geosciences Union
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.title.enClimate-CH<sub>4</sub> feedback from wetlands and its interaction with the climate-CO<sub>2</sub> feedback
dc.typeArticle de revue
dc.identifier.doi10.5194/bg-8-2137-2011
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Climatologie
dc.subject.halSciences de l'environnement/Milieux et Changements globaux
bordeaux.journalBiogeosciences
bordeaux.page2137-2157
bordeaux.volume8
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue8
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-01806765
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01806765v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=Biogeosciences&amp;rft.date=2011&amp;rft.volume=8&amp;rft.issue=8&amp;rft.spage=2137-2157&amp;rft.epage=2137-2157&amp;rft.eissn=1726-4170&amp;rft.issn=1726-4170&amp;rft.au=RINGEVAL,%20Bruno&amp;FRIEDLINGSTEIN,%20P.&amp;KOVEN,%20C.&amp;CIAIS,%20Philippe&amp;DE%20NOBLET-DUCOUDR%C3%89,%20N.&amp;rft.genre=article


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