不同下墊面雷暴雷達回波特征與地閃的關系
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寧波市氣象局科技計劃項目(NBQX2012010B)資助


Correlation Analysis of Lightning Activity and Radar Echo Characteristics of 〖JP〗 Thunderstorm under Different Underlying Surface
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    摘要:

    利用閃電定位資料和雷達資料,研究了寧波市城區、山區和海陸三種地區增強型雷暴的閃電活動特征,結果表明:城區增強型雷暴的≥50 dBz組合反射率面積和≥9 km、≥10 km回波頂高的回波面積,以及山區增強型雷暴的≥45 dBz組合反射率面積和≥12 km的回波頂高的回波面積,這些指標與每6 min地閃次數都有很好的相關性;而海陸增強型雷暴的≥10 km回波頂高的回波面積與每6 min地閃次數的線性關系明顯,相關系數高達0.916;3種增強型雷暴對地閃密度分布的影響各有不同,城區增強型雷暴會產生更多的地閃。

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    Based on the lightning detection and radar echo data, the CG (CloudtoGround) lightning characteristics of three kinds of enhanced thunderstorms (namely downtown, hilly and coastal areas) on the three different underlying surfaces are investigated. Result shows that there exists relationship between the CG lightning frequency at 6 min intervals and the coverage of composite reflectivity and echo top for the three kinds of intensified thunderstorms. In the downtown areas, the CG lightning frequency at 6 min intervals is closely related to the coverage of the composite reflectivity above 50 dBz, and the coverage of echo top exceeding 9 km and 10 km respectively. In the hilly areas, the frequency is correlated with the coverage of the composite reflectivity above 45 dBz and the coverage of echo top exceeding 12 km, while in the hilly areas, there is obvious linear relation between the CG lightning frequency and the coverage of echo top exceeding 10 km, with correlation coefficient up to 0.916. The CG lightning characteristics in three kinds of the intensified thunderstorm are different, and more CG lightning happens in urban thunderstorms.

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石湘波,黃旋旋,沈一平,鄭玲,王煥邦.不同下墊面雷暴雷達回波特征與地閃的關系[J].氣象科技,2015,43(5):880~887

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  • 收稿日期:2014-09-20
  • 定稿日期:2015-05-19
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  • 在線發布日期: 2015-11-02
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