大气季节内振荡对夏季登陆广东台风的影响  

A Study on the Effect of Atmospheric Intraseasonal Oscillations on the Typhoons Landfalling on Guangdong in Summer

作　　者：叶烁旎 凌征 YE Shuo-ni;LING Zheng(College of Marine Sciences and Meteorology,Guangdong Ocean University,Zhanjiang 524088;Guangdong Key Laboratory on Offshore Marine Environmental Change and Disaster Pre-warning,Zhanjiang 524088)

机构地区：[1]广东海洋大学海洋与气象学院,广东湛江524088 [2]广东省近海海洋环境变化与灾害预警重点实验室,广东湛江524088

出　　处：《广东气象》2020年第2期1-6,共6页Guangdong Meteorology

基　　金：广东省大学生创新创业训练计划项目(CXXL2018056);广东海洋大学科研启动经费资助项目(R17073)。

摘　　要：基于热带气旋最佳路径资料和向外长波辐射数据,结合高斯滤波、经验正交函数分解和合成分析等方法,探讨了20~90 d周期的MJO(Madden-Julian Oscillation)和10~20 d周期的QBWO(Quasi-Biweekly Oscillation)两类大气季节内振荡对夏季(5-9月)登陆广东台风的影响。结果表明:MJO和QBWO对登陆广东台风个数、强度、位置和运动方向均有显著影响:当MJO和QBWO的对流中心(抑制中心)靠近广东沿岸时,登陆广东的台风数量多(少)、强度大(小)、登陆位置偏东(西)、登陆后东向运动的台风数量偏多(少)。在此基础上,还进一步探讨了MJO和QBWO对生成于南海和西北太平洋的这两类登陆广东台风的影响及两者对登陆广东台风的共同影响。Based on optimized track data of tropical cyclones and outgoing longwave radiation data and with the methods of Gaussian Filter, Empirical Orthogonal Function and composite analysis, this work inquires into the effect of two kinds of atmospheric intraseasonal oscillations, i.e., Madden-Julian Oscillation(MJO), at periods of 20-90 d, and Quasi-Biweekly Oscillation(QBWO), at periods of 10-20 d, on the typhoons landfalling on Guangdong in summer(from May to September). The result is shown as follows. Both MJO and QBWO had significant effects on their number, intensity, location and movement direction. When the convection(restricting) centers of MJO and QBWO approached the coast of Guangdong, the typhoons landfalling on the province would be more(less), with large(small) intensity, eastward(westward) landfalling location and more(less) likelihood to move to the east after landfall. On the basis of the above research, this work also studies the effect of MJO and QBWO on two kinds of Guangdong-landfalling typhoons, one generated from the South China Sea and the other from the northwest Pacific, and their joint effect on the typhoons making landfall on Guangdong.

关 键 词：气候学 季节内振荡 登陆台风 夏季 广东 

分 类 号：P46[天文地球—大气科学及气象学]