不同下墊面雷暴雷達(dá)回波特征與地閃的關(guān)系
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寧波市氣象局科技計(jì)劃項(xiàng)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(dá)資料,研究了寧波市城區(qū)、山區(qū)和海陸三種地區(qū)增強(qiáng)型雷暴的閃電活動(dòng)特征,結(jié)果表明:城區(qū)增強(qiáng)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(qū)增強(qiáng)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(biāo)與每6 min地閃次數(shù)都有很好的相關(guān)性;而海陸增強(qiáng)型雷暴的≥10 km回波頂高的回波面積與每6 min地閃次數(shù)的線性關(guān)系明顯,相關(guān)系數(shù)高達(dá)0.916;3種增強(qiáng)型雷暴對(duì)地閃密度分布的影響各有不同,城區(qū)增強(qiáng)型雷暴會(huì)產(chǎn)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(dá)回波特征與地閃的關(guān)系[J].氣象科技,2015,43(5):880~887

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  • 收稿日期:2014-09-20
  • 最后修改日期:2015-05-19
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  • 在線發(fā)布日期: 2015-11-02
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