DIAGNOSIS OF WAVE ACTIVITY OVER RAINBAND OF LANDFALL TYPHOON

RAN Ling-kun; Abdul REHIM; AL RAMANATHAN

Abstract:

A generalized wave-activity density, which is defined as an absolute value of production of three-dimensional vorticity vector perturbation and gradient of general potential temperature perturbation, is introduced and its wave-activity law is derived in Cartesian coordinates. Constructed in an agoestrophic and nonhydrostatic dynamical framework, the generalized wave-activity law may be applicable to diagnose mesoscale weather systems leading to heavy rainfall. The generalized wave-activity density and wave-activity flux divergence were calculated with the objective analysis data to investigate the character of wave activity over heavy-rainfall regions. The primary dynamical processes responsible for disturbance associated with heavy rainfall were also analyzed. It was shown that the generalized wave-activity density was closely correlated to the observed 6-h accumulative rainfall. This indicated that the wave activity or disturbance was evident over the frontal and landfall-typhoon heavy-rainfall regions in middle and lower troposphere. For the landfall-typhoon rainband, the portion of generalized wave-activity flux divergence, denoting the interaction between the basic-state cyclonic circulation of landfall typhoon and mesoscale waves, was the primary dynamic process responsible for the evolution of generalized wave-activity density.

Get Citation+

RAN Ling-kun, Abdul REHIM, AL RAMANATHAN. DIAGNOSIS OF WAVE ACTIVITY OVER RAINBAND OF LANDFALL TYPHOON [J]. Journal of Tropical Meteorology, 2009, (2): 121-129.

Export:

Article Metrics

DIAGNOSIS OF WAVE ACTIVITY OVER RAINBAND OF LANDFALL TYPHOON

Institute of Atmospheric Physics, Chinese Academy of Sciences

Abstract: A generalized wave-activity density, which is defined as an absolute value of production of three-dimensional vorticity vector perturbation and gradient of general potential temperature perturbation, is introduced and its wave-activity law is derived in Cartesian coordinates. Constructed in an agoestrophic and nonhydrostatic dynamical framework, the generalized wave-activity law may be applicable to diagnose mesoscale weather systems leading to heavy rainfall. The generalized wave-activity density and wave-activity flux divergence were calculated with the objective analysis data to investigate the character of wave activity over heavy-rainfall regions. The primary dynamical processes responsible for disturbance associated with heavy rainfall were also analyzed. It was shown that the generalized wave-activity density was closely correlated to the observed 6-h accumulative rainfall. This indicated that the wave activity or disturbance was evident over the frontal and landfall-typhoon heavy-rainfall regions in middle and lower troposphere. For the landfall-typhoon rainband, the portion of generalized wave-activity flux divergence, denoting the interaction between the basic-state cyclonic circulation of landfall typhoon and mesoscale waves, was the primary dynamic process responsible for the evolution of generalized wave-activity density.

HTML

Reference (29)

[1]	LINDZEN R. S., HOLTON J. R. A theory of thequasi-biennial oscillatinn [J]. J. Atmos.Sci., 1968, 25:1095-1107.
[2]	MATSUNO T. Vertical propagation of stationary planetarywaves in the winter northern hemisphere [J]. J. Atmos. Sci.1970, 27: 871-883.
[3]	GAO Shou-ting, TAO Shi-yan, DING Yi-hui. Thegeneraised E-P flux wave-meamow interactions [J]. Sci. inChina (Ser. B). 1990, 33: 704-715.
[4]	PFEFFER R L. A study of eddy-induced fluctuations of thezonal-mean wind using conventional and transformed Euleriandiagnostics. [J] J. Atmos. Sci. 1992, 49: 1036-1050.
[5]	ANDREWS D G. Finite-amplitude Eliassen-Palm theoremin isentropic coordinates [J]. J. Atmos. Sci. 1983, 40:1877-1883.
[6]	BRUNET G., HAYNES P H. Low-latitude reflection ofRossby wave trains [J]. J. Atmos. Sci. 1996, 53: 482-496.
[7]	DURRAN D R. Pseudomomentum diagnostics fortwo-dimensional stratified compressible flow [J]. J. Atmos. Sci.1995, 52: 3997-4008.
[8]	MAGNUSDOTTIR G, HAYNES P H. Application ofwave-activity diagnostics to baroclinic-wave life cycles [J]. J.Atmos. Sci. 1996, 53: 2317-2353.
[9]	MU M. Energy casimir method in the study of nonlinearstability of the atmospheric motions [J]. Adv. in Mechan.,1998, 28: 235-249.
[10]	MU M, VLADIMIROV V, WU Yong-hui.Energy�Ccasimir and energy�Clagrange methods in the study ofnonlinear symmetric stability problems [J]. J. Atmos. Sci.,1999, 56: 400-411.
[11]	MURRAY D M. A pseudoenergy conservation law for thetwo-dimensional primitive equations [J]. J. Atmos. Sci. 1998,55: 2261-2269.
[12]	ELIASSEN A, PALM E. On the transfer of energy instationary mountain waves [J]. Geofys. Publ., 1961,22(3):1-23.
[13]	ANDREWS D G, MCINTYRE M E. Planetary waves inhorizontal and vertical shear: The generalized Eliassen-Palmrelation and the mean zonal acceleration [J]. J. Atmos. Sci.,1976, 33: 2031-2048.
[14]	GAO Shou-ting, ZHANG Heng-de, LU Wei-song.Ageostrophic Generalized E-P flux in Baroclinic Atmosphere[J]. Chin. Phys. Lett., 2004, 21: 576-579.
[15]	SCINOCCA J F, SHEPHERD T G. Nonlinearwave-activity conservation laws and Hamiltonian structure forthe two-dimensional anelastic equations [J]. J. Atmos. Sci.1992, 49: 5-27.
[16]	HAYNES P H. Forced, dissipative generalizations offinite-amplitude wave activity conservation relations for zonaland nonzonal basic flows [J]. J. Atmos. Sci., 1988, 45:2352-2362.
[17]	ZENG Qing-cun. Evolution of large-scale disturbancesand their interaction with mean flow in a rotating barotropicatmosphere [J]. Adv. Atmos. Sci., 1986, 3: 172-188.
[18]	ZENG Qing-cun, ZHANG Min. Wave-mean flowinteraction: the role of continuous-spectrum disturbances [J].Adv. Atmos. Sci., 2000, 17: 1-17.
[19]	HUANG Rong-hui. The role of greenland plateau in theformation of the northern hemispheric stationary planetarywaves in winter [J]. Chin. J. Atmos. Sci., 1983, 7: 393-402.
[20]	HUANG Rong-hui, GAMBO K. On other wave guide instationary planetary wave propagations in the winter NorthernHemisphere [J]. Sci. in China (Ser. B), 1983, 10: 940-950.
[21]	WU Guo-xiong, CHEN B. Non-acceleration theorem in aprimitive equation system. I: Acceleration of zonal meanflow[J]. Adv. Atmos. Sci., 1989, 6: 1-20.
[22]	LIU Shi-kuo, LIU Shi-da. Atmospheric Dynamics [M].Beijing: Peking University Press, 1999. 292-310.
[23]	LU Ke-li. Conservation conditions of potential vorticityand wave energy,action and enstrophy for Rossby waves.[J]. J.Trop. Meteor., 1995, 11: 258-268.
[24]	DING Yi-hui, SHEN Xin-yong. The Interactions betweenSymmetric Disturbance and Zonally Basic Flow. Part I: SlantE-P Flux Theory [J]. Chin. J. Atmos. Sci., 1998, 22: 735-743.
[25]	MCINTYRE M E, SHEPHERD T G. An exact localconservation theorem for finite amplitude disturbances tonon-parallel shear flows, with remarks on Hamiltonianstructure and on Arnold’s stability theorems [J]. J. Fluid.Mech., 1987, 181: 527-565.
[26]	RAN L, GAO S. A three-dimensional wave-activityrelation for pseudomomentum [J]. J. Atmos. Sci., 2007, 64:2126-2134.
[27]	RAN Ling-kun, BOYD J P. The theory of interactionbetween wave and basic flow. [J]. Chin. Phys., 2008, 17:1138-1146.
[28]	GAO S, RAN L. Diagnosis of wave activity in aheavy-rainfall event [J]. J. Geophys. Res., 2009, 114:D08119, doi:10.1029/2008JD010172.
[29]	GAO S, WANG X, ZHOU Y. Generation of generalizedmoist potential vorticity in a frictionless and moist adiabaticflow [J]. Geophys. Res. Lett., 2004, 31: L12113,doi:10.1029/2003GL019152.

DIAGNOSIS OF WAVE ACTIVITY OVER RAINBAND OF LANDFALL TYPHOON

Abstract:

References

Get Citation+

Share Article

Article Metrics

Proportional views

Manuscript History

Online:

通讯作者: 陈斌, bchen63@163.com