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SPATIAL AND TEMPORAL VARIABILITY OF NET ACCUMULATION FROM SHALLOW CORES FROM VESTFONNA ICE CAP (NORDAUSTLANDET, SVALBARD)
Univ Lapland, Arctic Ctr, Rovaniemi 96101, Finland..
Univ Helsinki, Dept Geosci & Geog, FIN-00014 Helsinki, Finland..
Univ Politecn Madrid, ETSI Telecomun, City Univ, E-28040 Madrid, Spain.;Uppsala Univ, Dept Earth Sci, S-75236 Uppsala, Sweden..ORCID-id: 0000-0001-6532-8590
Tallinn Univ Technol, Inst Geol, EE-19086 Tallinn, Estonia..
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2011 (Engelska)Ingår i: Geografiska Annaler. Series A, Physical Geography, ISSN 0435-3676, E-ISSN 1468-0459, Vol. 93A, nr 4, s. 287-299Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We analyse ice cores from Vestfonna ice cap (Nordaustlandet, Svalbard). Oxygen isotopic measurements were made on three firn cores (6.0, 11.0 and 15.5 m deep) from the two highest summits of the glacier located on the SWNE and NWSE central ridges. Sub-annual d18O cycles were preserved and could be counted visually in the uppermost parts of the cores, but deeper layers were affected by post-depositional smoothing. A pronounced d18O minimum was found near the bottom of the three cores. We consider candidates for this d18O signal to be a valuable reference horizon since it is also seen elsewhere in Nordaustlandet. We attribute it to isotopically depleted snow precipitation, which NCEP/NCAR reanalysis shows was unusual for Vestfonna, and came from northerly air during the cold winter of 1994/95. Finding the 1994/95 time marker allows establishment of a precise depth/age scale for the three cores. The derived annual accumulation rates indirectly fill a geographical gap in mass balance measurements and thus provide information on spatial and temporal variability of precipitation over the glacier for the period spanned by the cores (19922009). Comparing records at the two locations also reveals that the snow net accumulation at the easternmost part of Vestfonna was only half of that in the western part over the last 17 years.

Ort, förlag, år, upplaga, sidor
2011. Vol. 93A, nr 4, s. 287-299
Nyckelord [en]
accumulation rate, firn core, oxygen isotope ratio, sea ice, wind anomaly, Vestfonna
Forskningsämne
SWEDARCTIC; SWEDARCTIC 2007, Kinnvika 2007; SWEDARCTIC 2008, Kinnvika 2008; SWEDARCTIC 2009, Kinnvika 2009
Identifikatorer
URN: urn:nbn:se:polar:diva-2422DOI: 10.1111/j.1468-0459.2011.00439.xISI: 000297733500008OAI: oai:DiVA.org:polar-2422DiVA, id: diva2:883657
Tillgänglig från: 2015-12-17 Skapad: 2015-10-07 Senast uppdaterad: 2018-05-29

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Jonsell, UlfMoore, John C.
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Geografiska Annaler. Series A, Physical Geography

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