| Initiation Mechanism of Meso-β Scale Convective Systems |
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| 作者姓名： | Peng Jiayi Wu Rongsheng Wang Yuan |
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| 作者单位： | Peng Jiayi Wu Rongsheng and Wang YuanKey Laboratory of Mesoscale Severe Weather，Ministry of Education，ChinaDepartment of Atmospheric Sciences，Nanjing University，Nanjing 210093Department of Atmospheric Science，Nanjing Institute of Mete |
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| 基金项目： | 南京大学校科研和教改项目，江苏省自然科学基金，江苏省自然科学基金，the State Key Basic Program: CHERES |
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| 摘 要： | With the aid of the Penn State-NCAR MM5 model, the initiation mechanism of meso-β scaleconvective systems (MCS) is investigated on the basis of simulation of the temporal and spatialthermodynamic structure of the MCS that occurred in Wuhan, Hubei, China and its surrounding area on 21July 1998. Using the PV inversion method, comparisons among the upper-, middle-, and low-leveltropospheric potential vorticity (PV) perturbations, as well as their effects on the initiation of MCS, indicatethat the low-level tropospheric PV perturbations play an important role in the triggering of MCS. Furtheranalysis reveals that the interaction between the southwest low-level jet and the gravity-inertia wave indeedinitiates MCS in the conditionally unstable ambient atmosphere.
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| 关 键 词： | 触发机制 β中尺度对流系统 低空急流 重力波 不稳定层结 |
| 收稿时间： | 11 September 2001 |
Initiation mechanism of meso-β scale convective systems |
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| Peng Jiayi,Wu Rongsheng,Wang Yuan.Initiation mechanism of meso-β scale convective systems[J].Advances in Atmospheric Sciences,2002,19(5):870-884. |
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| Authors: | Peng Jiayi Wu Rongsheng Wang Yuan |
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| Institution: | Key Laboratory of Mesoscale Severe Weather, Ministry of Edueation, China ;Department of Atmospheric Science, Nanjing Institute of Meteorology, Nanjing, 210044,Department of Atmospherie Sciences, Nanjing University, Nanjing 210093,Department of Atmospherie Sciences, Nanjing University, Nanjing 210093 |
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| Abstract: | With the aid of the Penn State-NCAR MM5 model, the initiation mechanism of meso-β scale convective systems (MCS) is investigated
on the basis of simulation of the temporal and spatial thermodynamic structure of the MCS that occurred in Wuhan, Hubei, China
and its surrounding area on 21 July 1998. Using the PV inversion method, comparisons among the upper-, middle-, and low-level
tropospheric potential vorticity (PV) perturbations, as well as their effects on the initiation of MCS, indicate that the
low-level tropospheric PV perturbations play an important role in the triggering of MCS. Further analysis reveals that the
interaction between the southwest low-level jet and the gravity-inertia wave indeed initiates MCS in the conditionally unstable
ambient atmosphere. |
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| Keywords: | mesoscale convective systems low-level jet Gravity-inertia wave |
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