| 地基GPS水汽资料在江西一次大暴雨过程的应用分析 |
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| 引用本文： | 廖敏,邹海波,单九生,吴琼.地基GPS水汽资料在江西一次大暴雨过程的应用分析[J].气象与减灾研究,2012(3):33-38. |
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| 作者姓名： | 廖敏 邹海波 单九生 吴琼 |
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| 作者单位： | [1]宜春市气象局,江西宜春336000 [2]江西省气象科学研究所,江西南昌330046 |
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| 基金项目： | 公益性行业（气象）科研专项（编号：GYHY201106003）; 江西省科技厅项目（编号：20111BBG70031-1）; 江西省气象局重点项目“GPS/MET水汽反演技术在江西的本地化研究” |
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| 摘 要： | 利用江西省54个地基GPS站的逐时GPS PW、降雨资料和NCEP 1°×1°的fnl分析资料,综合分析了2012年5月12日江西中北部地区的大暴雨过程。结果表明,所有地基GPS站的降雨都出现在GPS可降水量(PW)持续增长4—21 h后,其中72.2%的测站的降雨出现在GPS PW持续增长4—12 h后,降雨都结束于GPSPW明显减小至某一稳定值(55 mm左右)时。降雨出现时GPS PW均大于某一值(阈值),且不同GPS站的阈值不相同,阈值会随海拔高度的增大而减小,特别是海拔高度大于200 m后,阈值随海拔高度的增加而减小的趋势更加明显。GPS PW的迅速增长是由低层(850 hPa)暖湿西南风急流加强东移至江西地区造成的。GPS PW的明显减小,是由于之前的强降雨消耗了空气的水汽所致。
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| 关 键 词： | 地基GPS PW 暴雨 急流 |
APPLICATION ANALYSIS OF GROUND-BASED GPS PW DATA ON A HEAVY RAINFALL EVENT IN JIANGXI |
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| Liao Min,Zou Haibo,Shan Jiusheng,Wu Qiong.APPLICATION ANALYSIS OF GROUND-BASED GPS PW DATA ON A HEAVY RAINFALL EVENT IN JIANGXI[J].Meteorology and Disaster Reduction Research,2012(3):33-38. |
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| Authors: | Liao Min Zou Haibo Shan Jiusheng Wu Qiong |
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| Institution: | 1.Meteorology Bureau of Yichun City,Yichun 336000,China 2.Meteorological Sciences Institute of Jiangxi Province,Nanchang 330046,China |
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| Abstract: | Based on Jiangxi GPS precipitable water（PW） data,precipitation data and NCEP fnl analysis data,the heavy rainfall process occurred in the north central Jiangxi on May 12 2012 is analyzed.The results show that the GPS PWs will continuously increase 4—21 hours before the rainfall begins,with those from 72.2% GPS observation stations continuously increasing 4—12 hours;and decreases to a stable value（about 55 mm） when the rainfall ends.The GPS PW is larger than a threshold value when the rainfall occurs,and this threshold value decreases with increasing altitude of GPS station,especially when the station altitude is greater than 200 m.Analysis of large-scale weather pattern indicates that 850 hPa southwesterly jet stream reinforces and shifts eastwards to Jiangxi will result in the rapidly increasing of GPS PW.The GPS PW value apparently decreases after the rainfall due to the consumption of water vapor in air by the heavy rainfall. |
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| Keywords: | Ground-Based GPS Precipitable water（PW） Heavy rainfall Jet stream |
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