Arctic stratospheric winter warming forced by observed SSTs

Details Arctic stratospheric winter warming forced by observed SSTs Arctic stratospheric winter warming forced by observed SSTs

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3611707h&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 11, CiteID L11707

Physics

2

Atmospheric Processes: Stratosphere/Troposphere Interactions, Atmospheric Processes: General Circulation (1223), Atmospheric Processes: Global Climate Models (1626, 4928), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513)

Scientific paper

Observations showed warming trends in the Arctic stratosphere in early winter months in the past few decades, in contrast to cooling trends in late winter months mainly due to ozone depletion. To examine whether observed warming trends is caused by sea surface temperature (SST) increases, we analyze results from AMIP simulations which are forced by observed time-varying SSTs. It is found that all AMIP simulations demonstrate warming trends in the Arctic lower stratosphere. It also shows a weakened Arctic polar vortex, in responding to the polar warming. Empirical Orthogonal function (EOF) analysis shows a downward trend toward the negative polarity of an annular-like mode. Further analyses indicate that the Arctic stratospheric warming is associated with increasing wave activity and enhanced wave-flux convergence in the extratropical stratosphere, suggesting that the polar warming is caused by enhanced wave-driven adiabatic heating due to SST increases.

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