Winter warming as an important co-driver for Betula nana growth in western Greenland during the past century

Global Change Biology
Jørgen HollesenBo Elberling

Abstract

Growing season conditions are widely recognized as the main driver for tundra shrub radial growth, but the effects of winter warming and snow remain an open question. Here, we present a more than 100 years long Betula nana ring-width chronology from Disko Island in western Greenland that demonstrates a highly significant and positive growth response to both summer and winter air temperatures during the past century. The importance of winter temperatures for Betula nana growth is especially pronounced during the periods from 1910-1930 to 1990-2011 that were dominated by significant winter warming. To explain the strong winter importance on growth, we assessed the importance of different environmental factors using site-specific measurements from 1991 to 2011 of soil temperatures, sea ice coverage, precipitation and snow depths. The results show a strong positive growth response to the amount of thawing and growing degree-days as well as to winter and spring soil temperatures. In addition to these direct effects, a strong negative growth response to sea ice extent was identified, indicating a possible link between local sea ice conditions, local climate variations and Betula nana growth rates. Data also reveal a clear shift withi...Continue Reading

Citations

Mar 8, 2017·Global Change Biology·Daniel AckermanJacques C Finlay
Aug 25, 2017·Biology Letters·Mads Forchhammer
Aug 19, 2017·Scientific Reports·Marc Macias-FauriaBruce C Forbes
Aug 26, 2018·Nature Communications·Magnus KramshøjRiikka Rinnan
Dec 5, 2018·International Journal of Biometeorology·Agata BuchwalBo Elberling
Sep 15, 2018·Frontiers in Plant Science·Ludovica D'ImperioInger K Schmidt
Jul 11, 2021·The Science of the Total Environment·Wenyi XuPer Lennart Ambus
Aug 21, 2021·Scientific Data·Mariana KlugeSari Peura
Sep 1, 2021·Global Change Biology·Mariana KlugeSari Peura

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