| 台风“麦莎”的强度对台风前部飑线发展过程影响的研究 |
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| 引用本文： | 刘佳,沈新勇,张大林,许映龙,毕明玉.台风“麦莎”的强度对台风前部飑线发展过程影响的研究[J].大气科学,2013,37(5):1025-1037. |
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| 作者姓名： | 刘佳 沈新勇 张大林 许映龙 毕明玉 |
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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 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)项目2013CB430103;国家公益性行业(气象)科研专项GYHY200806009;国家自然科学基金资助项目41075039、41175065;江苏省普通高校研究生科研创新计划项目 |
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| 摘 要： | 对2005年8月5日16时(UTC,下同)至6日00时发生的一次台风前部飑线过程进行了数值模拟,分析表明:台前飑线在母体台风和副高之间的湿区生成。台风为这次台前飑线过程提供了有利的条件,包括强的低空急流输送充沛的水汽,强的不稳定环境产生大的对流有效位能以及强的地表辐合,使得初始的离散的对流单体组织发展形成台前飑线。成熟时期的台前飑线虽然比中纬度和热带飑线的变压强度小,但是具有更强的低层暖湿空气入流,中层的入流范围也更加宽广。敏感性试验结果表明:台风强度越强,其台前飑线的回波强度越强,移动速度更快,生命史也更长。强台风使得低空垂直风切变更大,有利于台前飑线的生成和发展,在台前飑线发展成熟后,低空垂直风切变强度减小,不利于台前飑线的维持,加之低空水汽输送的减少,使其逐渐趋向衰亡。
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| 关 键 词： | 台风麦莎 台前飑线 低空垂直风切变 位涡反演 敏感性试验 |
| 收稿时间： | 2012/8/21 0:00:00 |
| 修稿时间： | 2013/1/17 0:00:00 |
Impact of Typhoon Intensity on the Development of a Pre-Tropical Cyclone Squall Line |
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| LIU Ji,SHEN Xinyong,ZHANG Dalin,XU Yinglong and BI Mingyu.Impact of Typhoon Intensity on the Development of a Pre-Tropical Cyclone Squall Line[J].Chinese Journal of Atmospheric Sciences,2013,37(5):1025-1037. |
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| Authors: | LIU Ji SHEN Xinyong ZHANG Dalin XU Yinglong and BI Mingyu |
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| Institution: | 1.Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 2100442.Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland 20742, USA3.National Meteorological Center, Beijing 100081 |
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| Abstract: | A severe pre-TC (Tropical Cyclone) squall line that preceded Typhoon Matsa (2005) was investigated using the non-hydrostatic "Weather Research and Forecast" model. The results showed that this pre-TC squall line formed in the moist transition zone between the parent TC and a subtropical high. It was found that Matsa may have contributed to convective development in the squall line by producing conditional instability and enhancing low-level moisture convergence, leading to the organization of the early discrete convection into a linear rainband. Although the pre-TC squall line caused fewer surface pressure perturbations at its mature stage than is typically observed at mid-latitudes, it exhibited stronger moisture convergence in the boundary layer and a larger area of inflow in the mid-troposphere. Sensitivity analyses showed that stronger TCs give pre-TC squall lines that are longer lived and faster moving, with more intense rainfall. The results showed that a stronger TC tends to produce more low-level vertical wind shear in the transition zone, which favors the organization of early discrete convection into a squall line. However, low level vertical wind shear in the vicinity of the pre-TC squall line decreases when the mature stage is entered. This, in addition to the likelihood of a reduced low-level moisture supply, appears to be one of the factors that is unfavorable for the pre-TC squall line being maintained. |
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| Keywords: | Typhoon Matsa Pre-TC squall line Low level vertical wind shear PV (potential vorticity) inversion Sensitivity experiment |
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