论文

敦煌致洪暴雨的广义湿位涡分析

  • 王伏村- ,
  • 许东蓓 ,
  • 王宝鉴 ,
  • 付双喜 ,
  • 代德彬
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  • 中国气象局兰州干旱气象研究所/甘肃省干旱气候变化与减灾重点实验室, 甘肃 兰州730020;2. 甘肃省张掖市气象局, 甘肃 张掖734000;兰州中心气象台, 甘肃 兰州730020;4. 甘肃省人工影响天气办公室, 甘肃 兰州730020

网络出版日期: 2013-02-28

Diagnostic Analysis on Generalized Moist Potential Vorticity of a Torrential Rainstorm Caused Flood in Dunhuang, Gansu

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Online published: 2013-02-28

摘要

利用高空、 地面定时观测资料、 区域站降水资料、 FY-2E红外云图和NCEP 1°×1°再分析资料, 对2011年6月15-16日甘肃敦煌、 阿克塞和肃北的一次历史罕见暴雨天气过程的影响系统、 水汽条件、 广义湿位涡及其倾向变化进行了分析。结果表明, 这次暴雨是中高纬天气系统与低纬天气系统相互作用的结果。暴雨水汽来源于700 hPa新疆东部偏西气流输送和600 hPa附近河西走廊西部偏东气流输送。广义湿位涡正异常主要集中在850~750 hPa广义位温线密集区, 这与实际大气水汽主要集中在低层是一致的, 在一定程度上反映出暴雨期的水汽分布和水汽集中特征。800 hPa上广义湿位涡的正异常区基本与暴雨区一致, 与湿位涡相比, 广义湿位涡能更好地诊断出这次暴雨落区。广义湿位涡正异常大值区出现在绝对涡度异常大值区与大的相对湿度梯度相重叠的区域。单点广义湿位涡倾向异常值的负正、 正负转换及峰值变化与降水开始、 结束和雨强变化相一致。广义湿位涡除了可作为一个分析暴雨系统发生、 发展的动力变量外, 还可体现出暴雨时期高水汽集中的特点, 在暴雨分析中有一定的优势。

本文引用格式

王伏村- , 许东蓓 , 王宝鉴 , 付双喜 , 代德彬 . 敦煌致洪暴雨的广义湿位涡分析[J]. 高原气象, 2013 , 32(1) : 145 -155 . DOI: 10.7522/j.issn.1000-0534.2012.00015

Abstract

Using the sounding and surface data, the satellite cloud images and the NCEP reanalysis data with 1°×1°, the synoptic situation, water vapor condition and generalized moist potential vorticity (GMPV) of the torrential rainstorm occurred in Dunhuang from 15 to 16 June 2011 are analyzed. The results show that this torrential rainstorm is caused by the interaction of the middle-high latitude weather system and the low latitude weather system. The water vapor transport is originated from the westerly air current on 700 hPa in the eastern Xinjiang and the easterly air current near 600 hPa in the western Hexi Corridor. The positive anomaly of GMPV mainly occurs in the dense region of generalized potential temperature isoline between 850~750 hPa, which reflects the water vapor distribution during torrential rainstorm. The GMPV positive anomaly area on 800 hPa is basically consistent with the torrential rainstorm area. Comparing with the MPV, the GMPV can diagnose location of this torrential rainstorm well. The GMPV positive anomaly is occurring the region of overlap between the absolute vorticity great anomaly value and the great relative humidity gradient. The transformation from negative to positive, the transformation from positive to negative and the peak value change of the GMPV tendency of single point are consistent with the precipitation beginning, ending and the rainstorm intensity change, respectively. The GMPV and its tendency not only can be taken as dynamical variables to analyze the location and intensity tendency of torrential rainstorm, but also can reflect the distribution and concentration of water vapor, which are useful for the analysis of torrential rainstorm cases.

参考文献

[1]Ertel H. Ein neuer hydrodynamischer Wirbelsatz[J]. Meteor Zeitschr Braunschweig, 1942, 59: 272-281.
[2]Hoskins B J, McIntyre M E, Robertson A W. On the use and significance of isentropic potential vorticity maps[J].Quart J Roy Meteor Soc, 1985, 111: 877-946.
[3]Bennets D A, Hoskins B J. Conditional Symmetric instability: A possible explanation for frontal rainbands[J]. Quart J Roy Meteor Soc, 1979, 105: 945-962.
[4]吴国雄,蔡雅萍,唐晓菁.湿位涡和倾斜涡度发展[J].气象学报, 1995, 53(4): 387-405.
[5]Robison W A. On the structure of potential vorticity in baroclinic instability[J]. Tellus, 1989, 41: 275-284.
[6]Davis C A, Emanuel K A. Potential vorticity diagnostics of cyclogensis[J]. Mon Wea Rev, 1991, 119: 1929-1953.
[7]Cao Z, Cho H R. Generation of moist potential vorticity in extratropical cyclones[J]. J Atmos Sci, 1995, 52: 3263-3281.
[8]Thorpe A J. Diagnosis of balanced vortex structure using potential vorticity[J]. J Atmos Sci, 1985, 42: 397-406.
[9]Montgomery M T, Farrell B F. Tropical cyclone formation[J]. J Atmos Sci, 1993, 50: 285-310.
[10]Hertenstein R F A, Schubert W H. Potential vorticity anomalies associated with squall lines[J]. Mon Wea Rea, 1991, 119: 1663-1672.
[11]Thorpe A J. Frontogenesis at the boundary between airmasses of different potential vorticity[J]. Quart J Roy Meteor Soc, 1990, 116: 561-572.
[12]Montgomery M T, Farrell B F. Moist surface frontogenesis associated with interior potential vorticity anomalies in a semigeostrophic model[J]. J Atmos Sci, 1991, 48: 343-347.
[13]Cho H R, Chan D S T. Meso-β-scale potential vorticity anomalies and rainbands. Part II: Moist model simulations[J]. J Atmos Sci, 1991, 48: 331-341.
[14]Xu Q. Formation and evolution of frontal rainbands and geostrophic potential vorticity anomalies[J]. J Atmos Sci, 1992, 49: 629-648.
[15]张艳霞,钱永甫,翟盘茂.大气湿位涡影响夏季江淮降水异常的机理分析[J]. 高原气象, 2008, 27(1): 26-34.
[16]吴哲红, 虞苏青, 丁治英,等. 贵州地区一次暴雨的数值模拟及不稳定性诊断分析[J].高原气象, 2008, 27(6): 1307-1314.
[17]屠妮妮, 陈静, 何光碧. 高原东侧一次大暴雨过程动力热力特征分析[J].高原气象, 2008, 27(4): 796-806.
[18]黄楚惠,顾清源,李国平,等.一次高原低涡东移引发四川盆地暴雨的机制分析[J].高原气象, 2010, 29(4): 832-839.
[19]井喜,李社宏,屠妮妮,等.黄河中下游一次MCC和中-β尺度强对流云团相互作用暴雨过程综合分析[J].高原气象, 2011, 30(4): 913-928.
[20]宋雯雯, 李国平. 一次高原低涡过程的数值模拟与结构特征分析[J].高原气象, 2011, 30(2): 267-276.
[21]井喜, 高青云, 杨静. 两个不同降水量级的MCC对比分析[J].高原气象, 2011, 30(2): 328-338.
[22]葛晶晶,陆汉城,张群,等.强烈发展的中尺度涡旋影响下持续性暴雨的位涡诊断[J].高原气象, 2012, 31(4): 952-962.
[23]王宏,王万筠,余锦华,等.河北东北部暴雪天气过程的湿位涡分析[J].高原气象, 2012, 31(5): 1302-1308.
[24]黄美元,徐华英.云和降水物理[M].北京:科学出版社, 1999: 1-56.
[25]Gao Shouting, Wang X R, Zhou Y S. Generation of generalized moist potential vorticity in a frictionless and moist adiabatic flow[J]. Geophys Res Lett, 2004, 31: L12113,doi:10.1029/2003GL019152.
[26]Gao Shouting, Zhou Yushu, Lei Ting, et al. Analyses of hot and humid weather in Beijing city in summer and its dynamical identification[J]. Science in China(D), 2005, 48(Supp.II): 128-137.
[27]Yang S, Gao S, Wang D. Diagnostic analysis of the ageostrophic vector in the non-uniformly saturated, frictionless and moist adiabatic flow[J]. J Geophys Res, 2007, 112: D09114, doi:10.1029/2006JD008142.
[28]高守亭,崔春光.广义湿位涡理论及其应用研究[J].暴雨灾害, 2007, 26(1): 3-8.
[29]周玉淑,曹洁,王东海.非均匀饱和广义湿位涡在暴雨分析与预测中的应用[J].应用气象学报, 2007, 18(6): 754-759.
[30]段廷扬,邓国,王东海.广义湿位涡与暴雨落区预报的诊断分析[J].大气科学, 2007, 31(6): 1301-1307.
[31]周玉淑.广义湿位涡在江淮流域暴雨分析和预报中的应用[J].大气科学, 2009, 33(5): 1101-1110.
[32]ZhouGuanbo, CuiChunguang, GAO Shouting. Application of generalized moist potential vorticity to the analysis of a torrential rain case[J]. Acta Meteor Sin, 2010, 24(6): 732-739.
[33]Liang Zhaoming, Lu Chungu,Tollerud E I. Diagnostic study of generalized moist potential vorticity in a non-uniformly saturated atmosphere with heavy precipitation[J].Quart J Roy Meteor Soc, 2010, 136: 1275-1288.
[34]黄荣辉,陈际龙. 我国东、 西部夏季水汽输送特征及其差异[J]. 大气科学, 2010, 34(6): 1035-1045.
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