Based on the criteria of WMO (World Meteorological Organization), 52 SSW (stratospheric sudden warming) events during 1957-2002 were firstly classified into two types:31 major warming and 21 minor warming events, then 31 major warming events were divided into 20 vortex displacement events and 11 vortex splitting events according to their forms of vortex. Using the ERA-40 daily reanalysis data from ECMWF, composition analysis was used to study these three types of SSW events from 1957 to 2002, including 20 vortex displacement major warming, 11 vortex splitting major warming and 21 minor warming events. The changes of stratosphere of these three were studied, and the anomalies of lower stratospheric planetary wave-number 1, wave-number 2 and the corresponding EP fluxes during the sudden warming period were also interviewed in detail. The results showed that the vortex displacement major warming offsets its low temperature center and the vortex, and reverses wind field of high latitude from westerly to easterly wind. The vortex splitting type splits its low temperature center and the vortex, and reverses wind field of high latitude into easterly wind as well as the vortex displacement event. Minor warming events only offsets its low temperature center, the vortex and wind field of high latitude remain stable. For all these three SSW types, the amplitude of wave-number 1 anomalously increases before the sudden warming and the amplitude of wave-number 1 reaches its climax when the warming occurs, but the climax reaching date and the degree of amplitude increase is different according to the different types. The vortex displacement events and minor warming events remain its climax of amplitude of wave-number 1 for approximately 6~8 days, while the vortex splitting type decreases its amplitude of wave number 1 when the warming occurs. As to the wave-number 2, the vortex displacement type and minor warming events are alike, the amplitudes increase before the sudden warming, and then decrease when the warming began. The vortex splitting type increases its amplitude of wave number 2 after the warming begins. The EP flux of wave-number 1 and wave-number 2 were also calculated and analyzed. The minor warming type and vortex displacement type both have strong upward wave-number 1 EP flux, but the vortex displacement type is stronger, these strongly uploaded EP fluxed of wave number 1 causes the strong increase of the amplitudes of wave number 1. However, the upward wave-number 2 EP flux of these two types is much weaker. For the vortex splitting type, the upward wavenumber 2 EP flux is quite strong, which leads to the increase of the amplitude of wave number 2.
XU Luyang
,
CHEN Quanliang
. Planetary Wave Activity and Its Impact on Different Types of SSW Events[J]. Plateau Meteorology, 2016
, 35(5)
: 1389
-1400
.
DOI: 10.7522/j.issn.1000-0534.2015.00051
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