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Fältarbete på Färskesjön 2013

Anne Birgitte Nielsen

Universitetslektor

Fältarbete på Färskesjön 2013

Regional climate model simulations for Europe at 6 and 0.2 k BP: sensitivity to changes in anthropogenic deforestation

Författare

  • G. Strandberg
  • E. Kjellstrom
  • Anneli Poska
  • S. Wagner
  • M. -J. Gaillard
  • A. -K. Trondman
  • A. Mauri
  • B. A. S. Davis
  • J. O. Kaplan
  • H. J. B. Birks
  • A. E. Bjune
  • R. Fyfe
  • T. Giesecke
  • L. Kalnina
  • M. Kangur
  • W. O. van der Knaap
  • Ulla Kokfelt
  • P. Kunes
  • M. Latalowa
  • L. Marquer
  • Florence Mazier
  • Anne Birgitte Nielsen
  • Benjamin Smith
  • H. Seppa
  • S. Sugita

Summary, in English

This study aims to evaluate the direct effects of anthropogenic deforestation on simulated climate at two contrasting periods in the Holocene, similar to 6 and similar to 0.2 k BP in Europe. We apply We apply the Rossby Centre regional climate model RCA3, a regional climate model with 50 km spatial resolution, for both time periods, considering three alternative descriptions of the past vegetation: (i) potential natural vegetation (V) simulated by the dynamic vegetation model LPJ-GUESS, (ii) potential vegetation with anthropogenic land use (deforestation) from the HYDE3.1 (History Database of the Global Environment) scenario (V + H3.1), and (iii) potential vegetation with anthropogenic land use from the KK10 scenario (V + KK10). The climate model results show that the simulated effects of deforestation depend on both local/regional climate and vegetation characteristics. At similar to 6 k BP the extent of simulated deforestation in Europe is generally small, but there are areas where deforestation is large enough to produce significant differences in summer temperatures of 0.5-1 degrees C. At similar to 0.2 k BP, extensive deforestation, particularly according to the KK10 model, leads to significant temperature differences in large parts of Europe in both winter and summer. In winter, deforestation leads to lower temperatures because of the differences in albedo between forested and unforested areas, particularly in the snow-covered regions. In summer, deforestation leads to higher temperatures in central and eastern Europe because evapotranspiration from unforested areas is lower than from forests. Summer evaporation is already limited in the southernmost parts of Europe under potential vegetation conditions and, therefore, cannot become much lower. Accordingly, the albedo effect dominates in southern Europe also in summer, which implies that deforestation causes a decrease in temperatures. Differences in summer temperature due to deforestation range from -1 degrees C in south-western Europe to +1 degrees C in eastern Europe. The choice of anthropogenic land-cover scenario has a significant influence on the simulated climate, but uncertainties in palaeoclimate proxy data for the two time periods do not allow for a definitive discrimination among climate model results.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap
  • Kvartärgeologi
  • MERGE: ModElling the Regional and Global Earth system
  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publiceringsår

2014

Språk

Engelska

Sidor

661-680

Publikation/Tidskrift/Serie

Climate of the Past

Volym

10

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

Copernicus GmbH

Ämne

  • Geology
  • Physical Geography

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1814-9332