| 冷空气影响辽东半岛热带气旋降水的数值试验 |
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| 引用本文： | 梁军,陈联寿,张胜军,等.冷空气影响辽东半岛热带气旋降水的数值试验[J].大气科学,2008,32(5):1107-1118. |
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| 作者姓名： | 梁军 陈联寿 张胜军 等 |
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| 作者单位： | 1.大连市气象台,大连 116001 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金 |
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| 摘 要： | Matsa（0509）是直接登陆辽东半岛的变性台风，利用MM5v3模式对2005年8月8~9日在山东半岛和辽东半岛发生的暴雨过程进行模拟，并通过敏感试验研究冷空气对辽东半岛热带气旋降水的影响。结果表明:冷空气入侵热带气旋外围，对辽东半岛地区对流云团的强度、上升运动及其降水具有明显的增强作用。对流层中下层弱冷空气和对流层中上层较强冷空气的作用，使辽东半岛地区的回波强度和上升运动明显加强，有利于半岛地区暴雨增幅，其中对流层中上层较强冷空气对辽东半岛暴雨的作用显著。无冷空气影响或对流层中下层强冷空气作用时，辽东半岛上空的上升运动和回波强度明显减弱，强对流维持时间短，半岛地区的降水量明显减少。
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| 关 键 词： | 冷空气 热带气旋 辽东半岛 暴雨 |
Numerical Study of Impact of Cold Air on Rainfall of Tropical Cyclone over Liaodong Peninsula |
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| LIANG Jun,CHEN Lianshou,ZHANG Shengjun and et al.Numerical Study of Impact of Cold Air on Rainfall of Tropical Cyclone over Liaodong Peninsula[J].Chinese Journal of Atmospheric Sciences,2008,32(5):1107-1118. |
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| Authors: | LIANG Jun CHEN Lianshou ZHANG Shengjun and |
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| Institution: | 1.Dalian Meteorological Observatory, Dalian 1160012.State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081 |
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| Abstract: | Matsa(0509) is an extratropical transition(ET) typhoon which made landfall in Liaodong Peninsula in 2005.The PSU/NCAR non-hydrostatic mesoscale model MM5 is used to simulate the heavy rainfall process in Shandong Peninsula and Liaodong Peninsula during 8-9 August 2005.Several sets of numerical simulations are performed to study the impact of cold air on the rainfall of landfall tropical cyclone(TC) over Liaodong Peninsula.Results indicate that the intensity of convective cloud clusters,vertical upward motion and precipitation in Liaodong Peninsula are increased obviously when the cold air is invading the external area of TC.Both of the weak cold air in the lower and middle troposphere and the rather strong cold air in the upper troposphere can lead to notable intensification of radar reflectivity and ascending motion in Liaodong Peninsula,which is favorable for enhancement of precipitation there.The latter effect is more significant than the former one.Without the impact of cold air in the lower and middle troposphere,the heavy rainfall center would occur in the north of Liaodong Peninsula.The severe cold air in the lower and middle troposphere can result in the weakening of vertical velocity and TC circulation over Liaodong Peninsula,thus TC rainfall decreases remarkably in that area. |
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| Keywords: | cold air tropical cyclone Liaodong Peninsula heavy rainfall |
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