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High-resolution microparticle profiles at NorthGRIP, Greenland: Case studies of the calcium-dust relationship

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dc.contributor.authorRuth, Urs
dc.contributor.authorWagenbach, Dietmar
dc.contributor.authorBigler, Matthias
dc.contributor.authorSteffensen, Jørgen P.
dc.contributor.authorRöthlisberger, Regine
dc.contributor.authorMiller, Heinz
dc.date.accessioned2024-09-02T17:49:53Z
dc.date.available2024-09-02T17:49:53Z
dc.date.issued2002
dc.description.abstractA novel flow-through microparticle detector was deployed concurrently with continuous flow analyses of major ions during the North Greenland Icecore Project 2000 field season. the easy-handling detector performs continuous counting and sizing. In this deployment the lower size-detection limit was conservatively set to 1.0 μm equivalent spherical particle diameter, and a depth resolution of ≤1cm was achieved for microparticle concentrations. the dust concentration usually followed the Ca2+ variability. Here results are presented from an inspection of the Ca/dust mass ratio in 23 selected intervals, 1.65 m long each, covering different climatic periods including Holocene and Last Glacial Maximum (LGM). A (Ca2+)/(insoluble dust) mass ratio of 0.29 was found for the Holocene and 0.11 for LGM. Changes to the Ca/dust ratio occur on an annual to multi-annual time-scale exhibiting the same pattern, i.e. a lower Ca/dust ratio for higher crustal concentrations. Moreover, the Ca2+/dust ratio may increase significantly during episodic events such as volcanic horizons due to enhanced dissolution of CaCO3. This calls into question the notion of deploying Ca2+ as a quantitative mineral dust reference species and shows the importance of variable source properties or fractionating processes during transport and deposition.
dc.description.numberOfPages6
dc.identifier.doi10.48350/158775
dc.identifier.publisherDOI10.3189/172756402781817347
dc.identifier.urihttps://boris-portal.unibe.ch/handle/20.500.12422/43382
dc.language.isoen
dc.publisherInternational Glaciological Society
dc.relation.ispartofAnnals of glaciology
dc.relation.issn0260-3055
dc.relation.organizationDCD5A442BF29E17DE0405C82790C4DE2
dc.subject.ddc500 - Science::530 - Physics
dc.titleHigh-resolution microparticle profiles at NorthGRIP, Greenland: Case studies of the calcium-dust relationship
dc.typearticle
dspace.entity.typePublication
oaire.citation.endPage242
oaire.citation.startPage237
oaire.citation.volume35
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unibe.contributor.rolecreator
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unibe.date.licenseChanged2021-09-21 13:41:17
unibe.description.ispublishedpub
unibe.eprints.legacyId158775
unibe.journal.abbrevTitleANN GLACIOL
unibe.refereedTRUE
unibe.subtype.articlejournal

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