气象科学2017，Vol.37Issue(2)：213-221,9.DOI:10.3969/2016jms.0030
热带气旋Haiyan(2013)快速增强过程内核涡度变化机制的数值模拟研究
Numerical simulation on change mechanism of the inner-core vorticity in the rapid intensification of tropical cyclone Haiyan (2013)
摘要
Abstract
Mesoscale numerical model WRF (Weather Research and Forecasting) was used to numerically simulate the Rapid Intensification (RI) process of Tropical Cyclone (TC) Haiyan (2013) over Northwest Pacific at high space-time resolution.A vertical vorticity diagnostic equation involving the interaction among systems with different scales was deduced to investigate the variation mechanism of inner -core vorticity of TC and its relation with RI process.Results show that vortex-scale stretching term (stre2),tilting term (tilt2) and vertical-advection term (advv2) play the most important role in vorticity tendency.Before the onset of RI process,the stre2 contributes to the generation of vorticity in the boundary layer,but it tends to suppress above the layer;the tilt2 promotes the vorticity tendency in lower atmosphere layers;the distribution of the advv2 is approximately contrary to that of the stre2.After the onset of RI process,the positive (negative) contribution of stre2 to vorticity tendency tends to strengthen at low (upper) levels;the tilt2 has more robust low-level upgrading influence as well as stronger upperlevel reducing influence in company with the alternately positive effect and negative effect at mid-levels;the positive contribution of the advv2 is able to enhance at low levels.关键词
热带气旋Haiyan/RI/数值模拟/不同尺度/涡度诊断Key words
TC Haiyan/RI/Numerical simulation/Different scales/Vorticity diagnosis分类
天文与地球科学引用本文复制引用
孙磊,余锦华..热带气旋Haiyan(2013)快速增强过程内核涡度变化机制的数值模拟研究[J].气象科学,2017,37(2):213-221,9.基金项目
国家自然科学基金资助项目(41575083,41575108) （41575083,41575108）
国家科技支撑计划(2012BAC21B02) （2012BAC21B02）
