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| MESO-SCALE CHARACTERISTICS OF THE UNBALANCED FORCE OF ATMOSPHERIC MOTION AND ENVIRONMENTAL FIELDS OF RAIN STORM ON 20—21 JULY 1998 |
| Received:April 11, 2003 Revised:December 23, 2003 |
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| KeyWord:Abrupt heavy rain;Meso-scale convective system;Unbalanced force of atmospheric motion;Diagnostic analysis |
| Author Name | Affiliation | | Chen Zhongming | Chengdu Institute of Plateau Meteorology, Chengdu 610072 | | Min Wenbin | Chengdu Institute of Plateau Meteorology, Chengdu 610072 | | Xu Maoliang | 成都大学都江堰分部, 都江堰, 611830 | | Gao Wenliang | Chengdu Institute of Plateau Meteorology, Chengdu 610072 |
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| Abstract: |
The conventional and satellite data were collected and sorted by the Research Project Group of Cause and Prediction Application of 1998 Yangtze River and Nunjian River heavy rain. Besides convent ional physical variables such as vorticity, divergence, vertical velocity θse to represent the basic characteristics of atmospheric motion, We calculated thermodynamic parameter CD which reflects the sloppy development of vert ical vort icity and the diagnostic variable U which reflects the unbalanced quality of mesoscale atmospheric motion and variability of vertical vorticity ∂ζ/∂t. Their calculation expressions are as follows:  . |