廣西長低溫雨雪冰凍過程環流特征及低溫擾動分析
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2019年中國氣局預報員專項項目 (CMAYBY2019087)、 區局項目(桂氣科2017Z06、2020M07、2021M05)共同資助


Analysis on Characteristics of Atmospheric Circulation and Low Temperature Disturbance of Long-Term Catastrophic Freezing Weather in Guangxi
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    摘要:

    利用常規觀測和NCEP再分析資料,分析2008—2019年廣西低溫雨雪冰凍過程(簡稱低溫過程)。結果表明:廣西低溫過程分為穩定阻塞、減弱阻塞、兩槽一脊及多波動型,穩定阻塞型持續8~15 d,其余類型小于等于6 d。穩定阻塞型中高緯補充的冷空氣及低緯輸送的水汽是廣西低溫過程持續的重要因素,700 hPa西南氣流提供水汽和熱量,有利于融化層及凍雨形成,低層寬廣的溫度鋒區及大的平均鋒生函數利于低溫過程持續。穩定阻塞型具有云頂溫度-10~0 ℃、低層冷墊≤-7 ℃、中層融化層≥8 ℃的凍雨溫度層結,兩槽一脊型則為云頂溫度-20~-10 ℃、無融化層、低層冷墊達-10 ℃的純雪溫度層結。穩定阻塞型低溫擾動路徑為東路加西路,其他型為東路,前期強低溫擾動具有指示意義。東路加西路低溫擾動先從貝湖南移,再從巴湖東移補充;巴湖低溫擾動不斷補充對長周期過程有重要作用。由前期低溫擾動位置及環流型可對低溫過程路徑及持續時間作初步判斷。

    Abstract:

    Using conventional observation and NCEP reanalysis data, the catastrophic freezing weather process (low-temperature process for short) in Guangxi during 2008-2019 are analyzed. The results show that the low-temperature process in Guangxi was divided into stable blocking, weakened blocking, trough-ridge, and fluctuation. The stable blocking process lasted 8 to 15 days, and the rest type was 6 days or less. The cold air constantly supplied from high latitudes and the water vapour transported from low latitudes were two essential factors for continuing the low-temperature process in Guangxi. Water vapour and heat provided by southwest wind at 700 hPa were conducive to melting layer formation and freezing rain. The wide temperature front area and high value of average frontogenetic function were favourable for the long time low-temperature process. There was freezing rain temperature stratification with cloud top temperature of -10 to 0 ℃, low layer cold pad ≤-7 ℃, middle layer melting layer ≥8 ℃ in stable blocking and pure snow temperature stratification with cloud top temperature of -20 to -10 ℃, no melting layer, and low layer cold pad temperature of -10 ℃ in trough-ridge. Path of Low-temperature disturbance (LTD) in stable blocking was “east+west” path, and those of other types were east path. The previous strong LTD had instructive significance. LTD first moved southward from Lake Baikal to the north of Guangxi, then eastward from Lake Balkhash along the plateau’s north in the “east+west” path process. The continuous supplement of LTD in the area of 75°E near Lake Balkhash played an important role. Based on the location of the previous LTD and the circulation, the path and duration of the low-temperature process could be judged preliminarily.

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王艷蘭,伍靜,唐橋義,唐熠,黎微微.廣西長低溫雨雪冰凍過程環流特征及低溫擾動分析[J].氣象科技,2022,50(1):75~84

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  • 收稿日期:2020-10-18
  • 定稿日期:2021-08-25
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  • 在線發布日期: 2022-02-28
  • 出版日期: 2022-02-28
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