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A new ice-core record from Lomonosovfonna, Svalbard: viewing the 1920-97 data in relation to present climate and environmental conditions
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2001 (English)In: Journal of Glaciology, ISSN 0022-1430, E-ISSN 1727-5652, Vol. 47, no 157, 335-345 p.Article in journal (Refereed) Published
Abstract [en]

In 1997 a 121 m ice core was retrieved from Lomonosovfonna, the highest ice field in Spitsbergen, Svalbard (1250 m a.s.l.). Radar measurements indicate an ice depth of 126.5 m, and borehole temperature measurements show that the ice is below the melting point, High-resolution sampling of major ions, oxygen isotopes and deuterium has been performed on the core, and the results from the uppermost 36 rn suggest that quasi-annual signals are preserved. The 1963 radioactive layer is situated at 18.5-18.95 m, giving a mean annual accumulation of 0.36 m we. for the period 1963-96. The upper 36 rn of the ice core was dated back to 1920 by counting layers provided by the seasonal variations of the ions in addition to using a constant accumulation rate, with thinning by pure shear according to Nye (1963). The stratigraphy does not seem to have been obliterated by meltwater percolation, in contrast to most previous core sites on Svalbard. The anthropogenic influence on the Svalbard environment is illustrated by increased levels of sulphate, nitrate and acidity. Both nitrate and sulphate levels started to increase in the late 1940s, remained high until the late 1980s and have decreased during the last 15 years. The records of delta O-18, MSA (methanesulphonic acid), and melt features along the core agree with the temperature record from Longycarbyen and the sea-ice record from the Barents Sea at a multi-year resolution, suggesting that this ice core reflects local climatic conditions.

Place, publisher, year, edition, pages
Norwegian Polar Res Inst, Polar Environm Ctr, N-9296 Tromso, Norway. Uppsala Univ, Dept Earth Sci, S-75236 Uppsala, Sweden. Univ Lapland, Arctic Ctr, Rovaniemi 96101, Finland. CNRS, Lab Glaciol & Geophys Environm, F-38402 St Martin Dheres, France. Tallinn Univ Technol, Inst Geol, EE-10143 Tallinn, Estonia. Univ Utrecht, Inst Marine & Atmospher Res, NL-3508 TA Utrecht, Netherlands. Univ Oslo, Dept Phys Geog, N-0316 Oslo, Norway. Univ Groningen, Ctr Isotope Res, NL-9747 AG Groningen, Netherlands. British Antarctic Survey, NERC, Cambridge CB3 0ET, England., 2001. Vol. 47, no 157, 335-345 p.
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SWEDARCTIC
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URN: urn:nbn:se:polar:diva-2442DOI: 10.3189/172756501781832313ISI: 000172783800018OAI: oai:DiVA.org:polar-2442DiVA: diva2:883483
Available from: 2015-12-17 Created: 2015-10-07 Last updated: 2015-12-17

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Moore, JMulvaney, Rvan den Broeke, M
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