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Reconstruction of three centuries of annual accumulation rates based on the record of stable isotopes of water from Lomonosovfonna, Svalbard
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Ansvarig organisation
2002 (Engelska)Ingår i: ANNALS OF GLACIOLOGY, VOL 35, Uppsala Univ, Dept Earth Sci, S-75236 Uppsala, Sweden. Tallinn Univ Technol, Inst Geol, EE-10143 Tallinn, Estonia. Univ Groningen, Ctr Isotope Res, NL-9747 AG Groningen, Netherlands. Univ Lapland, Arctic Ctr, FIN-96101 Rovaniemi, Finland. Norwegian Polar Res Inst, Polar Environm Ctr, N-9296 Tromso, Norway. Univ Utrecht, Inst Marine & Atmospher Res, NL-3508 TA Utrecht, Netherlands., 2002, s. 57-62Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

We use the upper 81 in of the record of stable isotopes of water from a 122 in long ice core from Lomonosovfonna, central Spitsbergen, Svalbard, to construct an ice-core chronology and the annual accumulation rates over the icefield. The isotope cycles are counted in the ice-core record using a model that neglects short-wavelength and low-amplitude cycles. We find approximately the same number of delta(18)O cycles as years between known reference horizons, and assume these cycles represent annual cycles. Testing the validity of this assumption using cycles in deltaD shows that both records give similar numbers of cycles. Using the delta(18)O chronology, and decompressing the accumulation records using the Nye flow model, we calculate the annual accumulation for the ice-core site back to AD 1715. We find that the average accumulation rate from 1715 to 1950 was on average 0.30 in w.e. Accumulation rates increased about 25% during the later part of the 20th century to an average of 0.41 in w.e. for the period 1950-97. The accumulation rates show highly significant 2.1 and 21 year periodicities, which gives credibility to our time-scale.

Ort, förlag, år, upplaga, sidor
Uppsala Univ, Dept Earth Sci, S-75236 Uppsala, Sweden. Tallinn Univ Technol, Inst Geol, EE-10143 Tallinn, Estonia. Univ Groningen, Ctr Isotope Res, NL-9747 AG Groningen, Netherlands. Univ Lapland, Arctic Ctr, FIN-96101 Rovaniemi, Finland. Norwegian Polar Res Inst, Polar Environm Ctr, N-9296 Tromso, Norway. Univ Utrecht, Inst Marine & Atmospher Res, NL-3508 TA Utrecht, Netherlands., 2002. s. 57-62
Serie
Annals of Glaciology-Series, ISSN 0260-3055 ; 35
Forskningsämne
SWEDARCTIC
Identifikatorer
URN: urn:nbn:se:polar:diva-2438DOI: 10.3189/172756402781816753ISI: 000182023600010ISBN: 0-946417-30-X (tryckt)OAI: oai:DiVA.org:polar-2438DiVA, id: diva2:883539
Konferens
International Symposium on Ice Cores and Climate, AUG 19-23, 2001, KANGERLUSSUAQ, GREENLAND
Tillgänglig från: 2015-12-17 Skapad: 2015-10-07 Senast uppdaterad: 2015-12-17

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