Cause Analyses of Severe Cold and Snowy WeatherFormation in Yunnan in Early 2008

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Plateau Meteorology ›› 2009, Vol. 28 ›› Issue (4) : 870-879.

Cause Analyses of Severe Cold and Snowy WeatherFormation in Yunnan in Early 2008

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Abstract

Yunnan region suffered from a serious damage of durative severe cold and snowy weather in early 2008. The disaster weather heavily influence security of traffic, electric power, communication and people′s life and property. To investigate the forming causes of the weather, the anomalous change of atmospheric status and general circulation were firstly investigated. Secondly, the relationship between sea surface temperature (SST) in eastern equatorial Pacific and atmospheric circulation as well as the climate anomalies in Yunnan are analyzed. The results showed that the calamity weather was closely related to stronger cold air, westerly troughs in Bengal Bay, gradually weakening subtropical high in western equatorial Pacific. At the same time, atmospheric anomalies during severe weather in Yunnan region mainly exhibited the characteristics of highhumidity, stronger uplifted air flow, warming in mid-high level and cooling in low level of troposphere. Further, the results also showed that the important role of cold SST anomalies on the weather.

Key words

Yunnan / Low temperature and / Cold SST in eastern / Climatic anomaly

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. Cause Analyses of Severe Cold and Snowy WeatherFormation in Yunnan in Early 2008. Plateau Meteorology. 2009, 28(4): 870-879

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