热带气象学报2024，Vol.40Issue(5)：776-788,13.DOI:10.16032/j.issn.1004-4965.2024.073
高层环境场对台风"黑格比"(2020)迅速增强的影响分析
Impact of Upper-tropospheric Environmental Field on Rapid Intensification of Typhoon Hagupit(2020)
摘要
Abstract
Rapid intensification(RI)remains a challenge in typhoon intensity forecasting.In order to enhance the understanding of the mechanism behind typhoon intensity variation and to improve the accuracy of typhoon intensity forecasts,this study analyzed the characteristics of the upper-tropospheric environmental field during the RI of Typhoon Hagupit(2020).Using the CMA Tropical Cyclone Best Track Dataset and the ERA5 reanalysis data,the present study discussed the possible mechanisms by which the upper-tropospheric environmental field affected typhoon intensity.The results show that:(1)The upper-level weather systems affecting the intensity of Typhoon Hagupit(2020)mainly included the South Asian high,the tropical upper-tropospheric trough,and the mid-latitude trough.(2)The upper-tropospheric environmental field facilitated the intensification of Typhoon Hagupit(2020)through its interaction with the upper-level outflow of the typhoon.On the one hand,favorable upper-tropospheric circulation enhanced the upper-level outflow by directing the eddy flux convergence of relative angular momentum to propagate toward the typhoon center.This process promoted the secondary circulation formed by the outflow and upward motion,leading to a decrease in the central pressure of Typhoon Hagupit(2020)and an increase in its intensity.On the other hand,the enhanced outflow restricted the development of the vertical wind shear and,consequently,weakened the ventilation effect and intensified the typhoon.(3)On the 360-K isentropic surface,the presence of small-scale positive potential vorticity(PV)anomalies atop the typhoon circulation enhanced the typhoon's intensity.At the same time,the"high-PV pool"in the stratosphere was connected with the positive PV anomaly region in the middle troposphere,which could promote the formation of the upper-level warm core and intensify the typhoon.The present study shows that a comprehensive analysis of the upper-tropospheric environmental field can offer insights for typhoon intensity forecasting.关键词
台风/迅速增强/高层环境场/高空外流/垂直风切变/位涡Key words
typhoon/rapid intensification/upper-tropospheric environmental field/upper-level outflow/vertical wind shear/potential vorticity分类
天文与地球科学引用本文复制引用
金茹,董美莹,李颖,王宁..高层环境场对台风"黑格比"(2020)迅速增强的影响分析[J].热带气象学报,2024,40(5):776-788,13.基金项目
浙江省科技计划项目(2024C03256) （2024C03256）
浙江省自然科学基金项目(LY21D050001) （LY21D050001）
国家自然科学基金项目(42205006) （42205006）
浙江省公益技术研究计划项目(LGF21D010001) （LGF21D010001）
浙江省气象局科技计划项目(2023YB09)共同资助 （2023YB09）
