| WRF中地形重力波参数化方案在一次华南暖区暴雨形成机制分析中的应用 |
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| 引用本文： | 刘蕾,丁治英,常越,陈茂钦.WRF中地形重力波参数化方案在一次华南暖区暴雨形成机制分析中的应用[J].气象科技,2012,40(2):232-240. |
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| 作者姓名： | 刘蕾 丁治英 常越 陈茂钦 |
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| 作者单位： | 1. 南京信息工程大学/气象灾害省部共建教育部重点实验室,南京210044;南京信息工程大学大气科学学院,南京210044
2. 广州市气象局,广州,510080 |
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| 基金项目： | 国家重点基础研究发展规划项目（No.2009CB421503）、国家自然科学基金项目（40775033、40975037） 共同资助 |
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| 摘 要： | 华南地形复杂多变，局地强对流天气频繁发生又难于预报。要准确模拟华南地区的降水情况必须考虑地形的影响。以发生在云雾山东南侧一次暖区暴雨过程为例，探讨中尺度WRFV3.1版本中新增加的地形重力波拖曳（GWDO）参数化方案对山区暴雨的模拟能力，以及本次暴雨的形成机制。数值试验利用2008年6月5日00:00至2008年6月6日12：00的每6 h一次的NCEP分析资料（水平分辨率为1°×1°）积分36 h对发生在云雾山东南侧暴雨过程进行模拟，通过与实况对比分析后得出：①模式中考虑了GWDO参数化方案的敏感性试验较好地模拟了广东阳江地区强降水的中心和强度，再现了暴雨过程中大尺度环流形势及其演变状况，成功地复制了中尺度低涡的位置及移向，而未考虑此方案的控制试验没能模拟出此次暴雨，其在中心位置和降水强度方面都与实况差别较大。②GWDO参数化方案的引入有效地减少由地形引起的对流层中层纬向风的偏差，比较合理地模拟出了地形对气流的影响，从而使山区暴雨的模拟效果更接近于实况。③由试验得出，地形重力波拖曳可以使能量在中层辐散，导致垂直上升运动加强并使降水加强和降水的范围相对集中，是本次特大暴雨产生的主要原因。
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| 关 键 词： | 华南 暴雨 GWDO参数化方案 数值模拟 地形 |
| 收稿时间： | 8/4/2010 12:00:00 AM |
| 修稿时间： | 2011/1/17 0:00:00 |
Application of Parameterization of Orographic Gravity Wave Drag in WRF Model to Mechanism Analysis of a Heavy Rain in Warm Sector over South China |
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| Liu Lei,Ding Zhiying,Chang Yue and Chen Maoqin.Application of Parameterization of Orographic Gravity Wave Drag in WRF Model to Mechanism Analysis of a Heavy Rain in Warm Sector over South China[J].Meteorological Science and Technology,2012,40(2):232-240. |
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| Authors: | Liu Lei Ding Zhiying Chang Yue and Chen Maoqin |
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| Institution: | 1 Key Laboratory of Meteorological Disasters of Ministry of Education, NUIST, Nanjing 210044; 2 Department of Atmospheric Sciences, NUIST, Nanjing 210044;1 Key Laboratory of Meteorological Disasters of Ministry of Education, NUIST, Nanjing 210044; 2 Department of Atmospheric Sciences, NUIST, Nanjing 210044;Guangzhou Meteorological Service, Guangzhou 510080;1 Key Laboratory of Meteorological Disasters of Ministry of Education, NUIST, Nanjing 210044; 2 Department of Atmospheric Sciences, NUIST, Nanjing 210044 |
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| Abstract: | The contribution of sophisticated terrain is a key factor of the generation of strong convective weather,which is hard to forecast.In order to improve the model simulation of rainfall in South China,the impact of terrain must be taken into account.A rainstorm occurred in the warm section in the southeast of Yunwushan is used as an example to investigate the simulation capability of Gravity Wave Drag by Orography(GWDO) parameterization,which is newly added into WRFV3.1,and its mechanisms.The simulation is conducted for 36 hours using the reanalysis data of NCEP(1°×1°) from 5 to 6 June 2008.Through the analysis and comparison of two experiments,it is concluded:(1) The sensitivity experiment achieved a success in the simulation of the center and strength of the rainstorm,and it revealed the large-and meso-scale circulation pattern and evolution of the heavy rain event and successfully duplicated the mesoscale low-vortex,whose temporal evolution characteristics were in accord with the movement of the precipitation center,while the control experiment without using the parameterization scheme failed.(2) The using of GWDO parameterization effectively reduced the zonal wind deviation in the middle troposphere,and the impact of terrain on the dynamic uplift of airflow was simulated reasonably.(3) According to experiments,the energy divergence in the middle caused by the orography-induced gravity wave was the main cause of the rainstorm,which enhanced the vertical movement and made the precipitation strengthened and relatively concentrated. |
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| Keywords: | heavy rain South China GWDO parameterization numerical simulation terrain |
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