浙北梅雨季低空急流特征及其與暴雨的關系
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Characteristics of Low Level Jets over Northern Zhejiang in Meiyu Season and Their Relationship with Heavy Rain Events
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    摘要:

    應用2004—2011年常規探空資料、浙江北部雨量資料和2011年NCEP/NCAR再分析資料,對梅雨季影響浙北的西南低空急流進行統計,并在此基礎上對急流活動與浙北暴雨的關系進行了分析,為浙江北部梅雨期暴雨的預報提供實際參考價值。結果表明:西南風低空急流在700 hPa層上出現次數最多,自上而下減少,其活動有明顯的日變化特征,早晨增強,傍晚減弱;在不同類型的低空急流中,以SJ型、DJU型和TJ型居多,而DJL型急流偏少。浙北梅雨季暴雨發生前近90%伴有急流活動,其中DJU型急流較多;夜間暴雨比白天暴雨更依賴于低空急流,夜間暴雨發生前12 h即有低空急流建立。2011年6月中旬的暴雨集中期對應著兩次西南風低空急流的增強過程,低空急流最大風速出現在600 hPa附近并向低層伸展。

    Abstract:

    Based on the conventional radiosonde rainfall data from 2004 to 2011 of the northern Zhejiang and 2011 NCEP/NCAR reanalysis data, analyzed are the statistic Characteristics of low level jets and their relationship with heavy rain events. The results show that the south west low level jet at 700 hPa appeared most frequently; the frequency decreased with altitude, and there was significant diurnal variation, strengthening in the morning and weakening in the evening; in different types of low level jets, SJ DJU, and TJ occurred relatively frequently. There were nearly 90% rainstorms over the northern Zhejiang in Meiyu season accompanied with low level jets, most of which were the DJU type. The night rainstorms were more closely related to low level jets, compared with daytime rainstorms, and low level jets occur usually 12 h before the happening of the night storms. The heavy rain process in mid June 2011 corresponded to two enhancing processes of the south west low level jet, with the maximum wind speed at 600 hPa and stretching down to the lower levels.

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徐娟,陳勇明.浙北梅雨季低空急流特征及其與暴雨的關系[J].氣象科技,2013,41(2):314~319

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  • 收稿日期:2011-10-31
  • 定稿日期:2012-04-05
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  • 在線發布日期: 2013-04-11
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