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Publication:
Seasonal accumulation timing and preservation of nitrate in firn at Summit, Greenland

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dc.contributor.authorBurkhart, John F.
dc.contributor.authorHutterli, Manuel
dc.contributor.authorBales, Roger C.
dc.contributor.authorMcConnell, Joseph R.
dc.date.accessioned2024-09-02T17:44:08Z
dc.date.available2024-09-02T17:44:08Z
dc.date.issued2004
dc.description.abstractIn a yearlong investigation of the air-snow transfer function for nitrate (NO3−) at the Greenland Environmental Observatory, Summit (3203 m above sea level), surface snow concentrations measured every other day were compared with levels measured in 10 snow pits dug adjacent to accumulation stakes. Concentrations in the surface snow ranged from 0.4 to 34 μM with a mean of 2.9 ± 1.9 μM. Measured firn profiles in the snow pits had a maximum NO3− concentration of 12 μM and a mean of 2.7 ± 0.5 μM. Reconstructed profiles from surface snow observations and accumulation data closely matched the observed profiles. The small difference in preserved concentrations from observed surface snow concentrations gives evidence of only 7% postdepositional loss at this site (mean annual accumulation ∼23 g cm−2 yr−1). Removing the three highest outliers (which may originate from local sources) of surface snow concentration drops the mean to 2.7 μM, further demonstrating preservation. Results indicate that at this site accumulation is the most significant process affecting preservation of nitrate in the firn. Other rapid postdepositional processes may impact surface snow concentrations, but do not appear to significantly change the preserved record. The inverse analysis of converting preserved records to surface snow concentrations provides equivalent evidence of the same preservation.
dc.description.numberOfPages9
dc.description.sponsorshipPhysikalisches Institut, Klima- und Umweltphysik (KUP)
dc.identifier.doi10.48350/158303
dc.identifier.publisherDOI10.1029/2004JD004658
dc.identifier.urihttps://boris-portal.unibe.ch/handle/20.500.12422/43051
dc.language.isoen
dc.publisherAmerican Geophysical Union
dc.relation.ispartofJournal of Geophysical Research: Atmospheres
dc.relation.issn2169-897X
dc.relation.organizationDCD5A442BF29E17DE0405C82790C4DE2
dc.subject.ddc500 - Science::530 - Physics
dc.titleSeasonal accumulation timing and preservation of nitrate in firn at Summit, Greenland
dc.typearticle
dspace.entity.typePublication
oaire.citation.endPage9
oaire.citation.issueD19
oaire.citation.startPage1
oaire.citation.volume109
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oairecerif.author.affiliationPhysikalisches Institut, Klima- und Umweltphysik (KUP)
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unibe.date.licenseChanged2021-08-19 14:06:14
unibe.description.ispublishedpub
unibe.eprints.legacyId158303
unibe.refereedTRUE
unibe.subtype.articlejournal

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