2019年初浙江罕見連陰雨過程的成因分析
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浙江省氣象局預報員專項項目(2021YBY03)、浙江省基礎公益研究計劃(GF21D050002)資助


Cause Analysis of Rarely Continuous Rainy Weather in Zhejiang Province during Early 2019
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    摘要:

    利用浙江省2019年2月地面氣象觀測資料、FY-2G紅外云圖資料、NCEP和ERAInterim再分析資料,對浙江省2019年冬末春初典型的連陰雨天氣過程的成因進行了分析,得出以下結論:①連陰雨期間500 hPa極渦呈偶極型,主體持續收縮在北極附近,浙江位于700 hPa和850 hPa切變南側穩定的西南氣流及溫度正距平中,對流層高層西風急流持續偏強、位置偏北,強度和位置變化超前于降雨;②源自孟加拉灣北部至青藏高原、中南半島到南海的兩條水汽通道持續輸送水汽至我國華東地區,浙江同時受兩條水汽帶疊加影響時雨強達到最大,紅外衛星云圖分析可對水汽輸送通道和天氣形勢作大致判斷,提供降雨預報輔助性參考;③700 hPa濕Q矢量顯著輻合區和850 hPa經向風0 m·s-1等風速線重疊的區域易出現明顯降雨,集中降雨時段浙江上空存在很大的低層假相當位溫和水汽通量的水平梯度,水汽輸送帶位于梯度區之上。

    Abstract:

    An event of continuous rainy weather occurred in Zhejiang Province in February 2019. The characteristics of atmospheric circulation are analyzed based on conventional observed data, FY-2E infrared satellite data, NCEP and ERAInterim reanalysis data. The results show: (1) The polar vortex shrinked near the North Pole in February 2019, which caused positive temperature and southwest wind anomaly at 700 hPa and 850 hPa; the westerly jet on the upper troposphere was norther and stronger than usual. The intensity and location of the jet changed ahead of rainfall. (2) There were two water vapour transport channels during continuous rainy weather, which were from the Tibet Plateau and Bay of Bengal vapour channel, Indo-China Peninsula and northern South China Sea. There will be heavy rain when both water vapour transport channels are strong in Zhejiang Province, and it can be clearly seen from the infrared cloud image. (3) The wet Q Vector convergence area at 700 hPa overlapped with the 0 m·s-1 longitudinal wind area at 850 hPa corresponded well with heavy rain area. There were large pseudoequivalent potential temperatures and water-vapour flux horizontal gradient in the lower troposphere, water vapour transport belt was under it.

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陳光宇,沈杭鋒,方陸俊,陶然亭,樊李苗.2019年初浙江罕見連陰雨過程的成因分析[J].氣象科技,2023,51(4):532~540

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  • 收稿日期:2022-06-21
  • 定稿日期:2023-04-18
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  • 在線發布日期: 2023-08-29
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