The impact of Greenland's deglaciation on the Arctic circulation

TY - JOUR

T1 - The impact of Greenland's deglaciation on the Arctic circulation

AU - Dethloff, K.

AU - Dorn, W.

AU - Rinke, A.

AU - Fraedrich, K.

AU - Junge, M.

AU - Roeckner, E.

AU - Gayler, V.

AU - Cubasch, U.

AU - Christensen, J. H.

PY - 2004/10/16

Y1 - 2004/10/16

N2 - The influence of Greenland's deglaciation on the atmospheric winter and summer circulation of the Arctic have been quantified with the high-resolution regional atmospheric model HIRHAM4. Greenland's deglaciation exerts a pronounced influence on the atmospheric winter circulation of the Arctic. The land areas over Siberia and the Canadian archipelago are warmed by up to 5°C. Parts of the Atlantic and the Arctic Ocean are cooled by up to 3°C. A north-eastward shift of the storm tracks occurs over the North Atlantic as well as an increase of synoptic activity over Alaska. The pronounced P-E changes connected with shifts in the synoptic storm tracks during winter would have important consequences for the atmospheric freshwater input into the Arctic Ocean and the Nordic sea with the potential to cause variability in the Arctic Ocean dynamics on centennial to millennial time scales. The significant differences between simulations with and without Greenland result in a decrease of the geopotential height and a dominant barotropic response of the Arctic atmosphere. These changes correspond to an enhanced winter polar vortex and stratospheric conditions more favorable for large Arctic ozone losses.

AB - The influence of Greenland's deglaciation on the atmospheric winter and summer circulation of the Arctic have been quantified with the high-resolution regional atmospheric model HIRHAM4. Greenland's deglaciation exerts a pronounced influence on the atmospheric winter circulation of the Arctic. The land areas over Siberia and the Canadian archipelago are warmed by up to 5°C. Parts of the Atlantic and the Arctic Ocean are cooled by up to 3°C. A north-eastward shift of the storm tracks occurs over the North Atlantic as well as an increase of synoptic activity over Alaska. The pronounced P-E changes connected with shifts in the synoptic storm tracks during winter would have important consequences for the atmospheric freshwater input into the Arctic Ocean and the Nordic sea with the potential to cause variability in the Arctic Ocean dynamics on centennial to millennial time scales. The significant differences between simulations with and without Greenland result in a decrease of the geopotential height and a dominant barotropic response of the Arctic atmosphere. These changes correspond to an enhanced winter polar vortex and stratospheric conditions more favorable for large Arctic ozone losses.

KW - 1610 Global change: Atmosphere (0315, 0325)

KW - 1620 Global change: Climate dynamics (3309)

KW - 3349 Meteorology and atmospheric dynamics: Polar meteorology

KW - 3354 Meteorology and atmospheric dynamics: Precipitation (1854)

KW - 3364 Meteorology and atmospheric dynamics: Synoptic-scale meteorology

UR - http://www.scopus.com/inward/record.url?scp=11044226913&partnerID=8YFLogxK

U2 - 10.1029/2004GL020714

DO - 10.1029/2004GL020714

M3 - Journal article

AN - SCOPUS:11044226913

SN - 1944-8007

VL - 31

JO - Geophysical Research Letters (Online)

JF - Geophysical Research Letters (Online)

IS - 19

ER -