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The derivation of a numerical diagnostic model for the forcing of the geopotential
Yuan, ZJ; Wu, JJ; Cheng, XH; Jian, MQ;
AbstractSimply applying the divergence operator to the horizontal velocity equation in spherical-isobaric coordinates yields a more solvable linear geopotential equation (than the geopotential tendency and the omega equations) for diagnosing the geopotential and its anomalies responsible for global floods and droughts. This geopotential model is freed from the zero-denominator problem caused by the observed neutral stability which affects the geopotential tendency and omega equations. The geopotential equation's forcing terms 2-5 (the direct operation results of the horizontal advection term in the velocity equation) can identify the synoptic signals mixed up by the classical divergence equation's quadratic and Jacobian terms (the manipulated results of the above terms 2-5). Solving this geopotential equation with the successive-over-relaxation method and the neutral stability as calculated from the reanalysis data produces reasonably good reconstructions of the global and local geopotential fields. The additional advantages of the present geopotential model over the geopotential tendency. omega and divergence models are that the geopotential model reveals and explains the following mechanisms which received less attention in previous studies. (1) The saddle patterns favour the high systems. (2) The equatorial easterlies favour the low systems. (3) The contributions of ageostrophic processes associated with jets and saddle flows to the transitions of weather patterns might be overlooked by the geopotential tendency model in which neutral stability and static instability in cold domes as well as jet-induced inertial instability are smoothed out artificially. Copyright (C) 2008 Royal Meterological Society
Department[Yuan, Zhuojian; Wu, Junjie; Jian, Maoqiu] Sun Yat Sen Univ, Dept Atmospher Sci, Ctr Monsoon & Reg Environm, Guangzhou 510275, Guangdong, Peoples R China; [Cheng, Xuhua] Chinese Acad Sci, S China Sea Inst Oceanol, LED, Guangzhou, Guangdong, Peoples R China
KeywordNumerical Diagnoses Instabilities Saddle Patterns Floods And Droughts
Subject AreaMeteorology & Atmospheric Sciences
Indexed Bysci
Funding ProjectLED
WOS IDWOS:000263166300008
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Recommended Citation
GB/T 7714
Yuan, ZJ,Wu, JJ,Cheng, XH,et al. The derivation of a numerical diagnostic model for the forcing of the geopotential[J]. QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY,2008,134(637):2067-2078.
APA Yuan, ZJ,Wu, JJ,Cheng, XH,Jian, MQ,& derivation of a numerical diagnostic model for the forcing of the geopotential.QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY,134(637),2067-2078.
MLA Yuan, ZJ,et al."The derivation of a numerical diagnostic model for the forcing of the geopotential".QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY 134.637(2008):2067-2078.
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