Diagnosis and application of potential shear deformation wave-activity density in the torrential rain of Typhoon Morokat (2009)

Chu Yan-Li; Wang Zhen-Hui; Ran Ling-Kun; Hao Shou-Chang

doi:10.7498/aps.62.099201

Abstract

Based on previous studies of the interaction between wave and flow, combining the vertical component of disturbance convective vorticity vector, the disturbance horizontal divergence and the vertical gradient of disturbance generalized potential temperature, We define a new disturbance thermodynamic shear advection parameter in this paper. This parameter means a typical wave action density, its equation of tendency is a typical wave action equation, which could describe the development or evolution of mesoscale disturbance. With the wave action density and the wave action equation, we have conducted a diagnostic analysis of the heavy-rainfall event caused by landfall typhoon "Morakot" in 2009. Results show that the abnormal values of the wave action density (namely the disturbance thermodynamic shear advection parameter) will always change with the development of the observed precipitation regions, both their horizontal distribution and their temporal evolution are quite similar. Statistical analysis reveals a certain correspondence between the wave action density and the observed 6-hour accumulated surface rainfall in the summer of 2009, and they are intimately related to each other. The wave action density may be used to describe the typical vertical structure of dynamic and thermodynamic fields of a precipitation system, so it is closely related to the occurrence and development of the precipitation system and may have certain relation with the surface rainfall regions. The calculation of the wave action flux divergence shows that at the time around the landing of typhoon "Morakot" in the southeastern China coastal region, the potential vorticity of disturbance ageostrophic wind is the main forcing term affecting the local variation of wave action density. The contribution of the coupled term between the first-order disturbance advection and disturbance shear to the local variation of wave action density is secondary. While the exchange of disturbance momentum and disturbance heat between the basic state and disturbance has relatively weak influence on the development and evolution of disturbance. After the landing of typhoon "Morakot" in the southeastern China coastal region, these forcing terms and the wave action itself are apparently weakened.

Keywords:

Authors and contacts

1.
Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China;
2.
Institute of Urban Meteorology, CMA, Beijing 100089, China;
3.
Institute of Atmospheric Physics, CAS, Beijing 100029, China;
4.
Shanxi Provincial Meteorological Service, Taiyuan 030002, China
Funds: Project supported by the National Basic Research Program of China (Grant Nos. 2013CB430105, 2009CB421505), the Key Program of the Chinese Academy of Science (Grant No. KZZD-EW-05), the Project of CAMS (Grant No. 2011LASW-B15), the Spectial Scientific Research Fund of the Meteorological Public Welfare of Ministry of Sciences and Technology (Grant No. GYHY200906004), and the National Natural Science Foundation of China (Grant Nos. 41175060, 41075098, 41005005).

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[30]	Gao S T, Yang S, Xue M, Cui C 2008 Adv. Atmos. Sci. 25 11
[31]	Ran L K, Yang W X, Hong Y C 2009 Journal of Tropical Meteorology 15 167
[32]	Gao S T, Wang X R, Zhou Y S 2004 Geophys. Res. Lett. 31 12113
[33]	Tao Z Y, Zhou X G, Zheng Y G 2012 Meteorological Monthly 38 28 (in Chinese) [陶祖钰, 周小刚, 郑永光 2012 气象 38 28]

Cited By

[1]	Chen L S, Meng Z Y 2001 Chinese Journal of Atmospheric Sciences 25 420 (in Chinese) [陈联寿, 孟智勇 2001 大气科学 25 420]
[2]	Sun J H, Zhao S X 2000 Chinese Journal of Atmospheric Sciences 24 223 (in Chinese) [孙建华, 赵思雄 2000 大气科学 24 223]
[3]	Tao S Y 1980 China Heavy Rainfall (Beijing: Science Press) (in Chinese) [陶诗言 1980 中国之暴雨 (北京: 科学出版社) ]
[4]	Qiu Y Y 1997 Meteorological Monthly 23 3 (in Chinese) [仇永炎 1997 气象 23 3]
[5]	Chen J K, Ding Z Y 2000 Journal of Applied Meteorological Science 11 271 (in Chinese) [陈久康, 丁治英 2000 应用气象学报 11 271]
[6]	Zhang X Q, Ding Z Y, Wang Y 2001 Meteorological Monthly 27 3 (in Chinese) [张兴强, 丁治英, 王焱 2001 气象 27 3]
[7]	Zhu H Y, Chen L S, Xu X D 2000 Chinese Journal of Atmospheric Sciences 24 669 (in Chinese) [朱洪岩, 陈联寿, 徐祥德 2000 大气科学 24 669]
[8]	Rogers R, Chen S Y, Tenerelli J, Willoughby H 1998 Monthly Weather Review 131 1577
[9]	Chen L S, Xu X D, Luo Z X 2002 Introduction to Tropical Cyclone Dynamics (Beijing: Meteorological Press) (in Chinese) [陈联寿, 徐祥德, 罗哲贤 2002 热带气旋动力学引论 (北京: 气象出版社)
[10]	Lin Y L, Chiao S, Wang T A, Kaplan M L, Weglarz R P 2001 Weather and Forecasting 16 633
[11]	Dong M Y, Chen L S, Zheng P Q, Pan J S 2009 Journal of Tropical Meteorology 25 495 (in Chinese) [董美莹, 陈联寿, 郑沛群, 潘劲松 2009 热带气象学报 25 495]
[12]	Chen Z M, Yang K Q, Wu H Y 2009 Acta Phys. Sin. 58 4362 (in Chinese) [陈忠明, 杨康权, 伍红雨 2009 物理学报 58 4362]
[13]	Edmon H J, Hoskins B J, Mcintyre M E 1980 J. Atmos. Sci. 37 2600
[14]	Dai X G, Wang P 2004 Chin. Phys. 13 1770
[15]	Gao S T, Ran L K 2009 J. Geophys. Res. 114 08119
[16]	Huang F, Lou S Y, Gao Y 2009 Chin. Phys. B 18 4622
[17]	Huang R H 1983 Chinese Journal of Atmospheric Sciences 7 393 (in Chinese) [黄荣辉 1983 大气科学 7 393]
[18]	Feng G L, Dong W J, Jia X J 2004 Chin. Phys. 13 413
[19]	Ran L K, John P B 2008 Chin. Phys. B 17 1138
[20]	Petterssen S 1956 Weather Analysis and Forecasting (Vol. 1) (New York: McGraw-Hill)
[21]	Yoshio K (Translated by Tian C S) 1984 Introduction of atmospheric dynamics (Beijing: Meteorological Press) (in Chinese) [约斯特.K著田春生译 1984 大气动力学入门 (北京: 气象出版社)]
[22]	Liu S K, Liu S D 1999 Atmospheric Dynamics (Beijing: Peking University Press) (in Chinese) [刘适瓜, 刘适达 1999 大气动力学 (北京: 北京大学出版社)]
[23]	Zhang Y J 1983 Acta Meteor. Sin. 41 219 (in Chinese) [张元箴 1983 气象学报 41 219]
[24]	Deng Q H 1986 J. Appl. Meteor. Sci. 1 165 (in Chinese) [邓秋华 1986 应用气象学报 1 165]
[25]	Martin J E 1998 Mon. Wea. Rev. 126 2000
[26]	Wang X B, Wu R S 2000 Acta Meteor. Sin. 58 403 (in Chinese) [王兴宝, 伍荣生 2000 气象学报 58 403]
[27]	Han G R, He J H, Fan Y F, Deng H J 2005 Acta Meteor. Sin. 63 468 (in Chinese) [韩桂荣, 何金海, 樊永富, 邓华军 2005 气象学报 63 468]
[28]	Li D, Coluccis J 2005 J. Atmos. Sci. 62 4043
[29]	Liu G, Liu S D, Liu F, Liu S K 2007 Acta Sci. Nat. Univ. Pekin. 43 17 (in Chinese) [刘刚, 刘式达, 刘峰, 刘式适 2007 北京大学学报 (自然科学版) 43 17]
[30]	Gao S T, Yang S, Xue M, Cui C 2008 Adv. Atmos. Sci. 25 11
[31]	Ran L K, Yang W X, Hong Y C 2009 Journal of Tropical Meteorology 15 167
[32]	Gao S T, Wang X R, Zhou Y S 2004 Geophys. Res. Lett. 31 12113
[33]	Tao Z Y, Zhou X G, Zheng Y G 2012 Meteorological Monthly 38 28 (in Chinese) [陶祖钰, 周小刚, 郑永光 2012 气象 38 28]

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