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Accession Number
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N20120011274
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Title
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Influence of North Pacific Sea Surface Temperature on the Arctic Winter Climate.
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Publication Date
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2012
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Media Count
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33p
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Personal Author
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C. I. Garfinkel M. M. Hurwitz P. A. Newman
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Abstract
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Differences between two ensembles of Goddard Earth Observing System Chemistry-Climate Model simulations isolate the impact of North Pacific sea surface temperatures (SSTs) on the Arctic winter climate. One ensemble of extended winter season forecasts is forced by unusually high SSTs in the North Pacific, while in the second ensemble SSTs in the North Pacific are unusually low. High Low differences are consistent with a weakened Western Pacific atmospheric teleconnection pattern, and in particular, a weakening of the Aleutian low. This relative change in tropospheric circulation inhibits planetary wave propagation into the stratosphere, in turn reducing polar stratospheric temperature in mid- and late winter. The number of winters with sudden stratospheric warmings is approximately tripled in the Low ensemble as compared with the High ensemble. Enhanced North Pacific SSTs, and thus a more stable and persistent Arctic vortex, lead to a relative decrease in lower stratospheric ozone in late winter, affecting the April clear-sky UV index at Northern Hemisphere mid-latitudes.
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Keywords
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Arctic regions
Atmospheric composition
Climate models
Forecasting
Ozone
Planetary waves
Sea surface temperature
Tropospheric waves
Wave propagation
Winter
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Source Agency
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National Aeronautics and Space Administration
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NTIS Subject Category
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55C - Meteorological Data Collection, Analysis, & Weather Forecast
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Corporate Author
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Goddard Space Flight Center, Greenbelt, MD.
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Document Type
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Journal article
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Title Note
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N/A
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NTIS Issue Number
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1226
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Contract Number
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N/A
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