大气低频振荡对2019年春季云南4次降水过程的影响  

Impact of Intraseasonal Oscillation on the four precipitation processes in Yunnan Province in the spring of 2019

作　　者：罗冬莉 赵尔旭 陈艳[2] 琚建华[2] LUO Dong-li;ZHAO Er-xu;CHEN Yan;JU Jian-hua(Yunnan Center of Meteorological Service,Kunming 650034,Yunnan,China;Yunnan Provincial Meteorological Administration,Kunming 650034,Yunnan,China)

机构地区：[1]云南省气象服务中心,云南昆明650034 [2]云南省气象局,云南昆明650034

出　　处：《云南大学学报（自然科学版）》2022年第5期990-997,共8页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金地区基金(NSFC41965005)。

摘　　要：利用云南125个气象站降水资料、NCEP/NCAR再分析资料、澳大利亚多变量实时热带季节内振荡(Madden-Julian Oscillation, MJO)指数,研究了大气低频振荡对2019年春季云南4次降水过程的影响.结果表明:(1)当强MJO事件位相位于第3、第4位相时,有利于云南春季的降水,2019年春季有2次明显的降水过程受此影响.(2)孟加拉湾附近地区的低频系统向北传递,能够把热带地区的对流系统或水汽带到云南地区,2019年春季云南有2次明显的降水过程与此有关.(3)中高纬地区的低频系统向南传递,能够把中高纬地区的冷空气带到云南地区,2019年春季云南最强的1次降水过程就是中高纬的冷空气与较好的水汽条件相结合造成的.The effects of Intraseasonal Oscillation on four precipitation processes in Yunnan in the spring of2019 were studied, based on precipitation data from 125 meteorological stations in Yunnan, NCEP/NCAR reanalysis data, and Australian multivariable real-time Madden-Julian Oscillation(MJO) index. The results show that:(1) When the strong MJO event phase is located in the third and fourth phases, it is beneficial to the spring precipitation in Yunnan, which affected two obvious precipitation processes in spring 2019.(2) The low frequency system near the Bay of Bengal moves northward and brings the convective system or water vapor from the tropical area to Yunnan, which was related to two significant precipitation processes in Yunnan in the spring of 2019.(3)The low frequency system in the middle and high latitudes moves southward, which can bring the cold air in the middle and high latitudes to Yunnan. The strongest precipitation in Yunnan in the spring of 2019 was caused by the combination of the cold air in the middle and high latitudes and fairly good water vapor conditions.

关 键 词：大气低频振荡 春季 降水过程 云南 

分 类 号：P466[天文地球—大气科学及气象学]