Interannual variability of the winter stratospheric polar vortex in the Northern Hemisphere and their relations to QBO and ENSO |
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Authors: | Wen Chen Ke Wei |
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Institution: | Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100190 and Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100190 |
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Abstract: | We investigated the interannual variations of the winter stratospheric polar vortex in this paper.
EOF analysis shows that two modes of variability dominate the stratospheric polar vortex on interannual
timescales. The leading mode (EOF1) reflects the intensity variation of the polar vortex and is characterized
by a geopotential height seesaw between the polar region and the mid-latitudes. The second one (EOF2) exhibits
variation in the zonal asymmetric part of the polar vortex, which mainly describes the stationary planetary
wave activity. As the strongest interannual variation signal in the atmosphere, the QBO has been shown to
influence mainly the strength of the polar vortex. On the other hand, the ENSO cycle, as the strongest
interannual variation signal in the ocean, has been shown to be mainly associated with the variation of
stationary planetary wave activity in the stratosphere. Possible influences of the stratospheric polar
vortex on the tropospheric circulation are also discussed in this paper. |
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Keywords: | stratospheric polar vortex EOF stationary wave QBO ENSO |
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