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Reconstruction of the historical temperature trend from measurements in a medium-length borehole on the Lomonosovfonna plateau, Svalbard
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2002 (English)In: ANNALS OF GLACIOLOGY, VOL 35, Univ Utrecht, Inst Marine & Atmospher Res, NL-3584 CC Utrecht, Netherlands. British Antarctic Survey, NERC, Cambridge CB3 0ET, England. Norwegian Polar Res Inst, Polar Environm Ctr, N-9296 Tromso, Norway. Univ Lapland, Arctic Ctr, FIN-96101 Rovaniemi, Finland. CNRS, Lab Glaciol & Geophys Environm, F-38402 St Martin Dheres, France. Uppsala Univ, Inst Earth Sci, S-75236 Uppsala, Sweden., 2002, 371-378 p.Conference paper, Published paper (Refereed)
Abstract [en]

A medium-length ice core was drilled at the ice divide oil the Lomorlosov-fonna plateau (1230 in a.s.l.), Svalbard, in May 1997. As part of this project, temperature measurements were performed in the 120 in deep borehole. At this site the ice thickness based oil radar measurements is 126.5 m and the mean annual accumulation rate is 380 kg m(-3). The measurements over the 15-120 in depth interval show a nearly isothermal profile with a mean value of -2.8degreesC and a standard deviation of 0.2degreesC. The measurements reveal a temperature minimum at approximately 70 in depth and a temperature gradient of 0.011 +/- 0.004degreesC m(-1) near the bottom. The temperature minimum and relatively low temperature gradient cannot be explained in terms of a steady-state climate. Numerical calculations with a simple one-dimensional diffusion-advection model show that the temperature increased at a maximum rate of 0.02-0.025 Ka(-1) over the last 100 years, the total temperature increase amounting to 2.0-3.0 K. Forcing the model with the observed record at Svalbard airport revealed that In the 19th century the surface temperature was at most 2.5 K lower, and that the instrumental observations started during a period with temperatures comparable to the end of the 19th century. The data are of particular interest for historical simulations since often no other temperature data are available in polar areas.

Place, publisher, year, edition, pages
Univ Utrecht, Inst Marine & Atmospher Res, NL-3584 CC Utrecht, Netherlands. British Antarctic Survey, NERC, Cambridge CB3 0ET, England. Norwegian Polar Res Inst, Polar Environm Ctr, N-9296 Tromso, Norway. Univ Lapland, Arctic Ctr, FIN-96101 Rovaniemi, Finland. CNRS, Lab Glaciol & Geophys Environm, F-38402 St Martin Dheres, France. Uppsala Univ, Inst Earth Sci, S-75236 Uppsala, Sweden., 2002. 371-378 p.
Series
ANNALS OF GLACIOLOGY, ISSN 0260-3055 ; 35
Research subject
SWEDARCTIC
Identifiers
URN: urn:nbn:se:polar:diva-2440DOI: 10.3189/172756402781816979ISI: 000182023600060ISBN: 0-946417-30-X (print)OAI: oai:DiVA.org:polar-2440DiVA: diva2:884075
Conference
International Symposium on Ice Cores and Climate, AUG 19-23, 2001, KANGERLUSSUAQ, GREENLAND
Available from: 2015-12-17 Created: 2015-10-07 Last updated: 2015-12-17

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