西太平洋副熱帶高壓位置對華北盛夏降水的影響
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國家科技部社會公益類項目(2002DIB20067)資助


Effect of West Pacific Subtropical High on Summer Precipitation in North China
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    摘要:

    應用1958~2002年NCEP/NCAR 500 hPa再分析資料,分析夏季逐日西太平洋副熱帶高壓在110°~130°E、20°~50°N區域脊線活動情況。發現盛夏(7~8月)副高在588 dagpm以上、脊線在30°N以北的日數與華北降水有大范圍正相關區,中心相關系數0.561(顯著性水平為0.001)。分析發現西太平副熱帶高壓越過30°N的初日(連續3天副高脊線越過30°N的首日)早晚與華北盛夏降水量顯著相關,初日與華北盛夏的平均降水量相關系數為-0.385,即副高北上早華北盛夏降水多,反之副高北上晚華北盛夏降水少。110°~130°E區域副高脊線越過30°N的日數和初日能更好地描述西太平洋副高與華北乃至我國東部盛夏降水的關系,對實際業務工作具有重要意義。

    Abstract:

    The daybyday ridge line positions of the West Pacific subtropical high in the area of 110°to 130°E and 20°to 50 °N are analyzed by means of the NCEP/NCAR reanalysis 500 hPa data from 1958 to 2002. The results show that there is a large positive correlation area in North China, where the precipitation in midsummer (July and August) is related to the number of days with the West Pacific subtropical high intensity being over 5880 gpm and the ridge line being north of 30°N (the correlation coefficient at the center being 0.561 and the significant level being 0.001). In addition, the date of the first day of West Pacific subtropical high crossing 30°N, i.e., the first day of the subtropical high ridge line being north f 30°N in three successive days, is closely correlated with the midsummer precipitation over North China, with a correlation coefficient of -0.385. The midsummer precipitation in North China was heavier when the West Pacific subtropical high moved northward earlier, and vise versa. The results indicate that the number of the days of the subtropical high ridge line being north of 30°N and the date of the ridge line crossing 30°N for the first time in the area of 110° to 130°E can well describe the relationship between West Pacific subtropical high and midsummer precipitation in North China, even in the eastern China, which is important for heavy rainfall forecasting.

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段麗瑤,榮艷淑,梁平德.西太平洋副熱帶高壓位置對華北盛夏降水的影響[J].氣象科技,2008,36(3):273~276

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  • 收稿日期:2006-02-06
  • 定稿日期:2007-04-23
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