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Publication:
Atmospheric methane, record from greenland ice core over the last 1000 years

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dc.contributor.authorBlunier, Thomas
dc.contributor.authorChappellaz, J. A.
dc.contributor.authorSchwander, Jakob
dc.contributor.authorBarnola, J.-M.
dc.contributor.authorDesperts, T.
dc.contributor.authorStauffer, Bernhard
dc.contributor.authorRaynaud, D.
dc.date.accessioned2024-09-02T17:49:56Z
dc.date.available2024-09-02T17:49:56Z
dc.date.issued1993
dc.description.abstractThe atmospheric methane concentration in ancient times can be reconstructed by analysing air entrapped in bubbles of polar ice sheets. We present results from an ice core from Central Greenland (Eurocore) covering the last 1000 years. We observe variations of about 70 ppbv around the mean pre-industrial level, which is confirmed at about 700 ppbv on a global average. According to our data, the beginning of the anthropogenic methane increase can be set between 1750 and 1800. Changes in the oxidizing capacity of the atmosphere may contribute significantly to the pre-industrial methane concentration variations, but changes in methane emissions probably play a dominant role. Since methane release depends on a host of influences it is difficult to specify clearly the reasons for these emission changes. Methane concentrations correlate only partially with proxy-data of climatic factors which influence the wetland release (the main source in pre-industrial times). A good correlation between our data and a population record from China suggests that man may already have influenced the CH4-cycle significantly before industrialisation.
dc.description.numberOfPages4
dc.description.sponsorshipPhysikalisches Institut
dc.description.sponsorshipPhysikalisches Institut, Klima- und Umweltphysik (KUP)
dc.identifier.doi10.48350/158781
dc.identifier.publisherDOI10.1029/93GL02414
dc.identifier.urihttps://boris-portal.unibe.ch/handle/20.500.12422/43387
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.titleAtmospheric methane, record from greenland ice core over the last 1000 years
dc.typearticle
dspace.entity.typePublication
oaire.citation.endPage2222
oaire.citation.issue20
oaire.citation.startPage2219
oaire.citation.volume20
oairecerif.author.affiliationPhysikalisches Institut, Klima- und Umweltphysik (KUP)
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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.licenseChanged2021-09-07 12:57:36
unibe.description.ispublishedpub
unibe.eprints.legacyId158781
unibe.journal.abbrevTitleGEOPHYS RES LETT
unibe.refereedTRUE
unibe.subtype.articlejournal

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