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Stratospheric control of the extratropical circulation response to surface forcing
Author(s) -
Fletcher Christopher G.,
Kushner Paul J.,
Cohen Judah
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl031626
Subject(s) - stratosphere , forcing (mathematics) , extratropical cyclone , climatology , atmospheric sciences , environmental science , troposphere , polar vortex , atmospheric circulation , sudden stratospheric warming , snow , circulation (fluid dynamics) , arctic oscillation , northern hemisphere , meteorology , geology , physics , thermodynamics
The transient atmospheric circulation response to fall season Siberia region snow forcing in an atmospheric general circulation model is investigated. The forcing generates a stratosphere‐troposphere interaction response whose coupling to the surface on multiple week timescales depends on the state of the stratosphere prior to the initiation of the forcing. An initially weak stratospheric polar vortex increases the likelihood of a negative Northern Annular Mode response at the surface. These results may provide useful insight for seasonal prediction of circulation anomalies arising from surface forcing in the extratropics.