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| 2005年初夏云南严重干旱的诊断分析 | |
| 引用本文： | 刘瑜,赵尔旭,黄玮,孙丹,琚建华.2005年初夏云南严重干旱的诊断分析[J].热带气象学报,2007,23(1):35-40. |
| 作者姓名： | 刘瑜 赵尔旭 黄玮 孙丹 琚建华 |
| 作者单位： | 1. 云南省气候中心,云南 昆明 650034 2. 云南省气象科技服务中心,云南 昆明 650034 3. 云南大学大气科学系,云南 昆明 650091 4. 中国气象局培训中心,北京 100081 |
| 基金项目： | 国家自然科学基金;国家重点基础研究发展计划(973计划);江苏省自然科学基金;江苏省气象局科研项目;江苏省重点实验室基金 |
| 摘 要： | 利用MM5V3.6模式对2005年4月25日一次典型的西南涡影响下的广西强降水过程进行了数值模拟与诊断分析,结果表明,在500hPa低槽、700hPa西南涡东南移的过程中,在西南涡的南端,由于对流层高层高值干位涡下传引起低层气旋性涡度增加,低涡向南伸出一低槽,使西南涡发展成“北涡南槽”形式,广西强降水出现在西南涡的南伸低槽附近。西南涡的南伸低槽附近垂直剖面上为等θe线陡立密集区,700hPa上MPV1<0,MPV2>0,低层有强烈辐合,高层有强烈辐散,从低层到高层都有上升运动。螺旋度对强降水的落区以及造成强降水的中尺度系统的发展有较好的指示性,它反映了大气的动力场特征,运用螺旋度作强降水预报还要结合水汽和不稳定条件。 |
| 关 键 词： | 西南涡 强降水 数值模拟 诊断分析 |
| 文章编号： | 1004-4965(2007)01-0027-08 |
| 收稿时间： | 2005/9/12 0:00:00 |
| 修稿时间： | 2005-10-09 |
DIAGNOSTIC ANALYSIS OF THE SEVERE DROUGHT OVER YUNNAN AREA IN THE EARLY SUMMER OF 2005 |
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| LIU Yu,ZHAO Er-xu,HUANG Wei,SUN Dan and JU Jian-hua.DIAGNOSTIC ANALYSIS OF THE SEVERE DROUGHT OVER YUNNAN AREA IN THE EARLY SUMMER OF 2005[J].Journal of Tropical Meteorology,2007,23(1):35-40. | |
| Authors: | LIU Yu ZHAO Er-xu HUANG Wei SUN Dan and JU Jian-hua |
| Institution: | Climate Center of Yunnan, Kunming 650034, China;Meteorological Science & Technology Services Center of Yunnan, Kunming 650034, China;Climate Center of Yunnan, Kunming 650034, China;Department of Atmospheric Science, Yunnan university, Kunming 650091, China;China Meteorological Administration Training Center, Beijing 100081, China |
| Abstract: | High temperature and drought occurred in Yunnan province during the late spring and early summer of 2005,which is the most severe event in this region since the 1950's.Based on the observational data and relevant diagnoses,this extreme weather event was studied and discussed.The results show that the occurrence of this event could be due to the following observational facts that happened in 2005.(1) The seasonal adjustment of middle-and high-level atmospheric circulation was delayed.(2) The cold air activity center was deviated north.(3) The onset of summer monsoon over the South China Sea was delayed.(4) The tropical convection was much weaker than usual.(5) The subtropical high over the western Pacific was located southwestwards and relatively strong. |
| Keywords: | southwest vortex heavy precipitation numerical simulation diagnostic analysis |
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