ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 34 Issue 12 > 2008,34(12):11-20. DOI:10.7519/j.issn.1000-0526.2008.12.002 Prev Next
Propagation and Accumulation of Perturbation Energy in the Severe Cold Surge, Icesnow and Frozen Disaster in South China During January 2008
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Abstract:
By using the NCEP/NCAR reanalysis data and the diagnosis analysis meth od of wave packet propagation (WPD), wave packet propagation and accumulation du ring the extreme lowtemperature, heavy snowstorm and frost disasters occurred i n South China were analyzed. Results show that the characteristic of wave packe t propagation at 500 hPa and 700 hPa can better display four processes of rainst orm weather.Accumulated perturbation energy has been maintaining high value when these four processes occur. Frozen weather appears in the high value region of wave packet. The characteristic of wave packet propagation shows that the pe rsistent processes of severe weathers with cold surge, icesnow and frozen rain on January 2008 are influenced by the Indian and Burma trough (IBT) in the south side of the QinghaiXizang Plateau. Because it is quite active, it also favors to the moisture transportation to China along the YunnanGuizhou Plateau from th e Indian Ocean and Bay of Bengal. Perturbation energies of cold air in the north ward path and in the eastward side of western Pacific subtropical high (WPSTH) a re certainly reflected on the wavepacket map. It indicates that the diagnosis a nalysis of wave packet propagation (WPD) is meaningful to predict the weather pr ocess.
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