| MOIST POTENTIAL VORTICITY DIAGNOSIS OF A MEIYU FRONTAL HEAVY RAIN PROCESS SIMULATION DURING SUMMER,1991 |
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| 作者姓名： | 张晶 韦统健 张向东 |
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| 作者单位： | Department of Geophysics Peking University，Beijing 100871，Department ot Atmospheric Sciences，Nanjing University，Nanjing 210093，Chinese Academy of Meteorological Sciences，Beijing 100081 |
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| 摘 要： | In this paper,the heavy rain process from June 30 to July 2,1991,has been simulated by MM4.and three-dimensional moist potential vorticity distribution of the simulation results has beencalculated.It is shown that moist potential vorticity is an important physical variable to reveal heavyrain structure and dynamic mechanisms.Negative moist potential vorticity corresponds to the Meiyufront-wind shear line system and the negative center corresponds to the heavy rain center.Negativemoist potential vorticity mainly attributes to the effects of meridional baroclinic term and convectiveunstable term.The former is favourable to the maintenance of zonal precipitation and the latter is themechanism of the heavy rain center propagating along the rain belt.The heavy rain is contributed bythe cooperative effects of conditional convective instability,baroclinic instability and upper air inertialinstability.
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MOIST POTENTIAL VORTICITY DIAGNOSIS OF A MEIYU FRONTAL HEAVY RAIN PROCESS SIMULATION DURING SUMMER,1991 |
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| Zhang Jing.MOIST POTENTIAL VORTICITY DIAGNOSIS OF A MEIYU FRONTAL HEAVY RAIN PROCESS SIMULATION DURING SUMMER,1991[J].Acta Meteorologica Sinica,1995(4). |
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| Authors: | Zhang Jing |
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| Affiliation: | Zhang Jing Department of Geophysics,Peking University,Beijing 100871Wei Tongjian Department of Atmospheric Sciences,Nanjing University,Nanjing 210093Zhang Xiangdong Chinese Academy of Meteorological Sciences,Beijing 100081 |
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| Abstract: | In this paper,the heavy rain process from June 30 to July 2,1991,has been simulated by MM4. and three-dimensional moist potential vorticity distribution of the simulation results has been calculated.It is shown that moist potential vorticity is an important physical variable to reveal heavy rain structure and dynamic mechanisms.Negative moist potential vorticity corresponds to the Meiyu front-wind shear line system and the negative center corresponds to the heavy rain center.Negative moist potential vorticity mainly attributes to the effects of meridional baroclinic term and convective unstable term.The former is favourable to the maintenance of zonal precipitation and the latter is the mechanism of the heavy rain center propagating along the rain belt.The heavy rain is contributed by the cooperative effects of conditional convective instability,baroclinic instability and upper air inertial instability. |
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| Keywords: | moist potential vorticity heavy rain Meiyu mesoscale model 4(MM4) |
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