台风“山竹”降水非对称特征及其与环境流场的相互作用研究

唐一宁; 冶磊; 李煜斌; 高志球

doi:10.16032/j.issn.1004-4965.2023.067

台风“山竹”降水非对称特征及其与环境流场的相互作用研究

doi: 10.16032/j.issn.1004-4965.2023.067

南京信息工程大学，江苏南京 210044

基金项目:

国家自然科学基金项目 42075072

详细信息

通讯作者:
李煜斌，男，江西省人，教授，从事大气边界层和热带气旋动力学研究。E-mail：liyubin@nuist.edu.cn

中图分类号: P444
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- 文章访问数: 140
- HTML全文浏览量: 20
- PDF下载量: 47
- 被引次数: 0
出版历程
- 收稿日期: 2022-01-05
- 修回日期: 2023-06-28
- 网络出版日期: 2023-12-30
- 刊出日期: 2023-10-20

ON THE ASYMMETRIC CHARACTERISTICS OF TYPHOON"MANGKHUT" PRECIPITATION AND ITS INTERACTION WITH ENVIRONMENTAL FLOW FIELD

Nanjing University of Information Science and Technology, Nanjing 210044, China

摘要

摘要: 基于卫星降水数据和再分析资料，识别了台风“山竹”的降水非对称特征及其与垂直风切变的相关性，并进一步使用WRF模式数值模拟探究了非对称降水引发的热带气旋内部动力过程对环境流场的反馈作用。(1) 台风“山竹”降水分布表现出明显的非对称性，强降水主要集中在南侧，而台风的平均风切变指向西南侧，强降水总是位于顺风切变的左侧。(2) 台风发展初期风切变指向强降水方位，之后逆时针旋转并不断增大，转至指向南侧时达到最大值，之后逐渐减小。(3) 非对称降水位置的改变伴随着非对称风场的改变，并影响着非对称温压场变化，而温压场的变化又进一步改变非对称风和降水，所以台风与环境流场存在着相互影响的反馈关系。
- 热带气旋 /
- 垂直风切变 /
- 非对称降水 /
- 数值模拟 /
- 环境流场
Abstract: Based on satellite-observed precipitation data and reanalysis data, this paper identifies the asymmetric characteristics of Typhoon"Mangkhut"precipitation and its correlation with vertical wind shear, and further uses WRF for numerical simulation to explore the feedback effect of asymmetric precipitation induced internal dynamic process on environmental flow. The main conclusions are as follows: (1) The precipitation distribution of Typhoon"Mangkhut"shows obvious asymmetry. It is mainly concentrated in the south, while the average wind shear of the typhoon points to the southwest, and the precipitation is always on the left side of the downshear. (2) At the initial stage of typhoon development, the wind shear points to the direction of heavy precipitation, rotates counterclockwise and increases continuously. It reaches the maximum when turning to the south, and then decreases gradually. (3) The change of asymmetric precipitation location is accompanied by the change of asymmetric wind field, and it affects the change of asymmetric temperature and pressure field; the change of temperature and pressure field further changes the asymmetric wind and precipitation. Therefore, there is an interactive feedback between Typhoon"Mangkhut"and the environmental flow field.
- tropical cyclone /
- vertical wind shear /
- asymmetric precipitation /
- numerical simulation /
- environmental flow field

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图 1 最佳路径数据集与TCE试验中的台风“山竹”

a. 路径；b. 强度。a中黑线为最佳路径集，灰线为TCE。b中黑色为最佳路径数据集，灰色为TCE，实线为10 m最大风速，虚线为最低气压。

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图 2 台风“山竹”降水方位分布与风切变指向的时间序列

a. GPM降水和ERA5风切变结果；b. TCE的结果。灰度填色图为降水，灰色短横线为风切的方向，黑色竖线之间的时间为分析台风降水与环境场的相互作用关系的时间段。

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图 3 距离台风“山竹”中心200~300 km环状区域内垂直各层平均风和风切变随时间变化

a. ERA5结果；b. TCE结果；c. NTCE结果；d. TCE减去NTCE的结果。d中灰圈标注区域为台风动力引起非对称风变化的主要区域。

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图 4 台风“山竹”300 km范围内平均降水图

a. 10日18时；b. 11日00时；c. 11日06时。

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图 5 台风“山竹”300 km范围内400 hPa垂直速度图

正值为向上的垂直速度。a. 10日18时；b. 11日00时；c. 11日06时。

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图 6 400 hPa高度处TCE与NTCE的非对称风和一波位势高度场差异图(上)，风场和一波温度图(下)

范围为中心向四周1 200 km。a. 10日18时高度场；b. 11日00时高度场；c. 11日06时高度场；d. 10日18时温度场；e. 11日00时温度场；f. 11日06时温度场。

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图 7 同图 6，但为800 hPa高度处

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