Buoyancy of convective-scale updrafts in the outer cores of sheared tropical cyclones

论文摘要

通常认为局地浮力与对流活动息息相关。本文统计分析了不同强度垂直风切变影响下热带气旋外核区对流尺度上升运动的浮力特征。研究发现,弱至中等强度的垂直风切变环境下,顺切变象限的浮力大于逆切变象限的浮力,顺切变象限的总浮力随风切变的增大而减小。而在极端强度的风切变影响下,大部分总浮力为负值。热力浮力、动力浮力与上升运动垂直质量输送没有明显相关性,因此总浮力和垂直质量输送也无显著相关性。上述结果加深了我们对热带气旋外核区对流发生发展过程的物理认识。

论文目录

• 1. Introduction
• 2. Experimental setup and updraft identification
•   2.1. Setup of the numerical experiments
•   2.2. Convective-scale updraft identification
• 3. Buoyancy characteristics of outer-core updrafts
• 4. Summary

文章来源

类型: 期刊论文

作者: LI Qingqing,FANG Qiaoxian

关键词: 热带气旋,垂直风切变,外核区,上升运动,浮力

来源: Atmospheric and Oceanic Science Letters 2019年01期

年度: 2019

分类: 基础科学

专业: 气象学

单位: Pacific Typhoon Research Center, Key Laboratory of Meteorological Disaster of the Ministry of Education, Nanjing University of Information Science and Technology,State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences

基金: supported by the National Key Research and Development Program of China [grant numbers 2017YFC1501601 and 2015CB452803],the National Natural Science Foundation of China [grant numbers41475058,41730961,and 41875054],the Basic Research Fund of the Chinese Academy of Meteorological Sciences[grant number 2016Z003],the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions(TAPP)

分类号: P444

页码: 58-65

总页数: 8

文件大小: 1879K

下载量: 16