STUDY OF DOUBLE RAIN BANDS IN A PERSISTENT RAINSTORM OVER SOUTH CHINA

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Hhd eqIq4~B@0STUDY OF DOUBLE RAIN BANDS IN A PERSISTENT RAINSTORM OVER SOUTH CHINA

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"c&j8IjD0Abstract:Using the U.S.National Centers for Environmental Prediction/National Center for Atmospheric Research reanalysis data at 1°× 1° resolution,analysis is performed on a persistent heavy rainfall event with two rain bands to the south of the Yangtze River during 17-22 June 2005.The northern rain band was related to the atmospheric mass adjustment of cold front precipitation and the associated ageostrophic feature to the rear right of subtropical westerly jets,while the southern counterpart formed under the joint influence of easterly/westerly jets and the South Asian high(SAH).The ageostrophic wind field to the rear right of the easterly jet center gives rise to an anti-circulation that favors the genesis of the southern belt.The feature of du/dt <0 around the SAH ridge line and to the rear right of the easterly jet streak results in a strong ν-νg0 feature appears to the north of the rain region,i.e.,behind the center of the westerly jets.The associated mass adjustment leads to vigorous divergence over the rain region,which is responsible for the strong precipitation from the warm sector of the front.Also,a θe front at the middle level of the southern rain band and the cold front favor the release of instable energy to enhance the rainstorm.The southern and northern fronts approach each other and the two rain belts merge into one.水利论文q~+L P#uNOQ;q{(n{

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作者:

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DING Zhi-ying[1] LIU Cai-hong[1] CHANG Yue[2] SHEN Xin-yong[1] HE Jin-hai[1] XU Hai-ming[1]

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aY^"SK0~0Jiangsu Key Laboratory of Meteorological Disasters, Nanjing University of Information Science & Technology(NUIST), Nanjing 210044 China;College of Atmospheric Sciences, NUIST, Nanjing 210044 ChinaGuangzhou Municipal Meteorological Center, Guangzhou 510080 China水利论文tST m6t

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JOURNAL OF TROPICAL METEOROLOGY水利论文 r.H l])hG_

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2010, 16(4)水利论文A ~cL p7Z+Nbl

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Keywords:水利论文m;W5v2c'[ k ]

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easterly/westerly upper-air jets

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warm-region rainstorm水利论文U3PoBX1O

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middle-level θ front水利论文*ZI~5V^/sn$l

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SOUTH CHINA southern the South Asian high region Center the Yangtze River northern reanalysis data heavy rainfall wind field ridge line divergence influence Research mass approach results related genesis two

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E8BV RW+^0National Program on Basic Research Project(973 Program),Natural Science Foundation of China,Natural Science Foundation of China水利论文[;sevRH?

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