摘要
为更好地分析极端异常北上台风“美莎克”的影响机制,利用ERA50.5°×0.5°逐6 h再分析资料,FY-2G卫星资料,NCEP再分析资料及东北地区常规气象观测资料,就台风北上过程的大尺度环流背景、动力、热力、水汽条件等方面进行诊断分析。结果表明,西太平洋副热带高压与鄂霍茨克海上的高压脊合并加强、稳定维持是造成“美莎克”北上的主要原因,与西风带低涡相互作用使得台风持续时间较长,台风结构在与西风带系统逐渐融合且北上的过程中强度逐渐减弱,雨强也随之迅速减弱。高空急流的抽吸作用及低层辐合、高层辐散的配置,使降水稳定维持,3条水汽通道的建立使多地区出现台风暴雨,物理量条件的非对称性分布造成了降水的非对称性。台风登陆前后不稳定性有所变化,登陆后短时间内不稳定性增强对应着降水的增幅,登陆后主要以稳定性降水为主。干冷空气入侵初期增强了降水不稳定性,冷空气的深入使台风暖心结构遭到破坏,随后减弱变性。
In order to better analyze the impact mechanism of the extremely abnormal northward typhoon“Maysak”,based on ERA50.5°×0.5°6 hourly reanalyzed data,NCEP reanalyzed data,the conventionally observed data,FY-2G satellite data,analyzed the large scale circulation background、power、heat and moisture conditions,etc.The results show that Strengthen,stability of the Western Pacific subtropical high and Okhotsk blocking high was the main cause of“May-sak”always toward the north,interaction with the westerlies low vortex makes a longer duration of typhoon,precipitation intensity weakened as the typhoon weakened.Jet pumping function,the configuration of low-level convergence and high-level divergence makes steady rainfall,the establishment of three water vapor channels makes many regions appeared ty-phoon heavy rain,the asymmetry of precipitation due to the asymmetry distribution of physical conditions.The instability changes during the typhoon landfall,the increase in instability in a short period of time after landfall corresponds to the increase in precipitation.the precipitation is mainly stable after landfall.Dry cold air initial invasion increased the insta-bility,warm heart structure was destroyed,the typhoon weakened with the constant intrusion of cold air.
作者
李瑶
巩远发
谭政华
王梅
赵美玲
任丽
LI Yao;GONG Yuanfa;TAN Zhenghua;WANG Mei;ZHAO Meiling;REN Li(College of Atmosphere Science,Chengdu University of Information Technology,Chengdu 610225,China;Daxinganling Meteorological Administration,Daxinganling 165000,China;Liaoning Meteorological Observatory,Shenyang 110000,China;Heilongjiang Meteorological Observatory,Harbin 150060,China)
出处
《成都信息工程大学学报》
2024年第6期739-748,共10页
Journal of Chengdu University of Information Technology
基金
黑龙江省自然科学基金联合引导资助项目(LH2019D016)。
关键词
台风
暴雨
非对称性
物理量
急流
typhoon
rainstorm
asymmetry
physical quantities
jet
