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Publication:
Changes in the atmospheric CH4 gradient between Greenland and Antarctica during the Last Glacial and the transition to the Holocene

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cris.virtualsource.author-orcid0be70263-c197-409f-99a9-b4b96f6a2fff
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cris.virtualsource.author-orcid977d8363-4cee-48f8-9b0d-32b4267fd06e
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dc.contributor.authorDällenbach, A.
dc.contributor.authorBlunier, Thomas
dc.contributor.authorFlückiger, J.
dc.contributor.authorStauffer, Bernhard
dc.contributor.authorChappellaz, J.
dc.contributor.authorRaynaud, D.
dc.date.accessioned2024-09-02T17:50:10Z
dc.date.available2024-09-02T17:50:10Z
dc.date.issued2000
dc.description.abstractSignificant variations in the interpolar difference of atmospheric CH4 concentration over the Holocene period were observed by Chappellaz et al., [1997]. Here we extend this study to the Last Glacial and the transition to the Holocene. We observe a gradient of −3±4 parts per billion by volume (ppbv) during the Last Glacial Maximum. It increases to 26±10 ppbv during the Bølling/Allerød and remains at 26±9 ppbv during the Younger Dryas cold period. On average, we find an interpolar difference of 14±4 ppbv during the cold phases and of 37±10 ppbv during the warm periods of the Last Glacial. With a three-box model we derive from the measured gradients the contributions of methane from the Tropics and the mid-to-high latitudes of the northern hemisphere. The Tropics have been the largest source in all glacial epochs. The contribution by the northern latitudes have been very small during the last glacial maximum but surprisingly large during the earlier part of the glacial epoch. The model result suggests completely unexpected, that the higher atmospheric CH4 concentration during the warm Dansgaard/Oeschger events are caused by a higher source strength of the northern latitudes and not of the Tropics.
dc.description.numberOfPages4
dc.description.sponsorshipPhysikalisches Institut, Klima- und Umweltphysik (KUP)
dc.description.sponsorshipPhysikalisches Institut
dc.identifier.doi10.48350/158799
dc.identifier.publisherDOI10.1029/1999GL010873
dc.identifier.urihttps://boris-portal.unibe.ch/handle/20.500.12422/43404
dc.language.isoen
dc.publisherAmerican Geophysical Union
dc.relation.ispartofGeophysical Research Letters
dc.relation.issn0094-8276
dc.relation.organizationDCD5A442C44AE17DE0405C82790C4DE2
dc.relation.organizationDCD5A442BF29E17DE0405C82790C4DE2
dc.subject.ddc500 - Science::530 - Physics
dc.titleChanges in the atmospheric CH4 gradient between Greenland and Antarctica during the Last Glacial and the transition to the Holocene
dc.typearticle
dspace.entity.typePublication
oaire.citation.endPage1008
oaire.citation.issue7
oaire.citation.startPage1005
oaire.citation.volume27
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oairecerif.author.affiliationPhysikalisches Institut, Klima- und Umweltphysik (KUP)
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oairecerif.author.affiliationPhysikalisches Institut
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unibe.date.licenseChanged2021-09-06 16:17:36
unibe.description.ispublishedpub
unibe.eprints.legacyId158799
unibe.journal.abbrevTitleGEOPHYS RES LETT
unibe.refereedTRUE
unibe.subtype.articlejournal

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