Contemporaneous Relationship between"0801 Snow Storm over Southern China"and Medium-term Activities of Mongolian High
By using the 1000 hPa geopotential height grid data during the 10 January--2 February in 1951—2008(from the NCEP／NCAR daily reanalysis dataset)，a set of circulation indices are calculated to statistically analyze the medium—term processes of the Mongolian high during the“0801 snow storm over southern China”period，including indices of the intensity P and centre position(λ_c,φ_c)of the high．The results show that the P and φ_c of Mongolian high had four consecutive oscillations during the period of 10 January-2 February 2008，which quasisynchronously related to the four medium—term processes of temperature fall and precipitation over southern China．On the composite dynamic diagram of P and(λ_c,φ_c)，the four active processes of Mongolian high corresponded well with four mediumterm temperature fall and precipitation oscillations．This unique characteristic of the medium—term development of Mongolian high has been shown only once since 1951．Therefore，under the condition of abundant water vapor supply，it is the strong and continuous outbreaks of Mongolian high that directly caused the“0801 snow storm over southera China”．
0801 snow stormsouthern ChinaMongolian highatmospheric circulation indicesanomalous medium-term process
国家科技期刊平台
NSTL
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