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Research article - Peer-reviewed, 2016

Atlantic SSTs control regime shifts in forest fire activity of Northern Scandinavia

Drobyshev, Igor; Bergeron, Yves; de Vernal, Anne; Moberg, Anders; Ali, Adam A.; Niklasson, Mats; Drobyshev, Igor;

Abstract

Understanding the drivers of the boreal forest fire activity is challenging due to the complexity of the interactions driving fire regimes. We analyzed drivers of forest fire activity in Northern Scandinavia (above 60 N) by combining modern and proxy data over the Holocene. The results suggest that the cold climate in northern Scandinavia was generally characterized by dry conditions favourable to periods of regionally increased fire activity. We propose that the cold conditions over the northern North Atlantic, associated with low SSTs, expansion of sea ice cover, and the southward shift in the position of the subpolar gyre, redirect southward the precipitation over Scandinavia, associated with the westerlies. This dynamics strengthens high pressure systems over Scandinavia and results in increased regional fire activity. Our study reveals a previously undocumented teleconnection between large scale climate and ocean dynamics over the North Atlantic and regional boreal forest fire activity in Northern Scandinavia. Consistency of the pattern observed annually through millennium scales suggests that a strong link between Atlantic SST and fire activity on multiple temporal scales over the entire Holocene is relevant for understanding future fire activity across the European boreal zone.

Published in

Scientific Reports

2016, volume: 6, article number: 22532
Publisher: NATURE PUBLISHING GROUP

Authors' information

Swedish University of Agricultural Sciences, Southern Swedish Forest Research Centre
Bergeron, Yves
Université du Québec en Abitibi-Témiscamingue (UQAT)
de Vernal, Anne
University of Quebec Montreal (UQAM)
Moberg, Anders
Stockholm University
Ali, Adam A.
University of Montpellier
Swedish University of Agricultural Sciences, Southern Swedish Forest Research Centre
Université du Québec en Abitibi-Témiscamingue (UQAT)

Associated SLU-program

Forest
Climate

UKÄ Subject classification

Ecology
Climate Research
Meteorology and Atmospheric Sciences

Publication Identifiers

DOI: https://doi.org/10.1038/srep22532

URI (permanent link to this page)

https://res.slu.se/id/publ/81100