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Jesper Sjolte

Jesper Sjolte

Forskare

Jesper Sjolte

Modelling the regional climate and isotopic composition of Svalbard precipitation using REMOiso : A comparison with available GNIP and ice core data

Författare

  • D. V. Divine
  • J. Sjolte
  • E. Isaksson
  • H. A.J. Meijer
  • R. S.W. van de Wal
  • T. Martma
  • V. Pohjola
  • C. Sturm
  • F. Godtliebsen

Summary, in English

Simulations of a regional (approx. 50 km resolution) circulation model REMOiso with embedded stable water isotope module covering the period 1958-2001 are compared with the two instrumental climate and four isotope series (δ18O) from western Svalbard. We examine the data from ice cores drilled on Svalbard ice caps in 1997 (Lomonosovfonna, 1250 m asl) and 2005 (Holtedahlfonna, 1150 m asl) and the GNIP series from Ny-Ålesund and Isfjord Radio. The surface air temperature (SAT) and precipitation data from Longyearbyen and Ny-Ålesund are used to assess the skill of the model in reproducing the local climate. The model successfully captures the climate variations on the daily to multidecadal times scales although it tends to systematically underestimate the winter SAT. Analysis suggests that REMOiso performs better at simulating isotope compositions of precipitation in the winter than summer. The simulated and measured Holtedahlfonna δ18O series agree reasonably well, whereas no significant correlation has been observed between the modelled and measured Lomonosovfonna ice core isotopic series. It is shown that sporadic nature as well as variability in the amount inherent in precipitation process potentially limits the accuracy of the past SAT reconstruction from the ice core data. This effect in the study area is, however, diminished by the role of other factors controlling δ18O in precipitation, most likely sea ice extent, which is directly related with the SAT anomalies.

Avdelning/ar

  • MERGE: ModElling the Regional and Global Earth system

Publiceringsår

2011-11-29

Språk

Engelska

Sidor

3748-3759

Publikation/Tidskrift/Serie

Hydrological Processes

Volym

25

Issue

24

Dokumenttyp

Artikel i tidskrift

Förlag

John Wiley & Sons Inc.

Ämne

  • Climate Research

Nyckelord

  • Forward proxy modelling
  • Ice cores
  • Regional modelling
  • Stable water isotopes
  • Svalbard climate

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0885-6087