同期MJO对广西汛期强降水过程的影响  

The influence of Madden Julian Oscillation on the heavy rainfall process during flood season in Guangxi

作　　者：覃卫坚 李耀先 陈思蓉 

机构地区：[1]广西区气候中心,广西南宁530022 [2]广西区气象局,广西南宁530022

出　　处：《气象研究与应用》2017年第4期18-21,共4页Journal of Meteorological Research and Application

基　　金：广西自然科学基金(2013GXNSFAA019273);广西区气象局气象科研计划(桂气科2016Z04);广西延伸期气候预测创新团队项目共同资助

摘　　要：使用1978~2013年广西80个气象观测站的日降水资料、NOAA MJO指数逐候资料和OLR逐日资料,研究MJO活动对广西汛期强降水的影响,得到结果:当MJO对流所处各位相位于第1位相(80E)时,广西暴雨频数偏少;当MJO对流所处各位相位于第3位相(120E)时,广西暴雨频数偏多。广西降水与赤道MJO对流和中纬度季节内振荡有密切的关系,赤道地区MJO对流强度偏强,有向北传播时广西降水偏多,赤道地区MJO对流强度偏弱时广西降水偏少。The influence of MJO on the heavy rainfall process during flood season in Guangxi was studied by using daily precipitation data from the 80 meteorological stations in Guangxi, NOAA MJO index pentad da- ta, and OLR daily data from 1961~2013. The results showed that： when the MJO convection center was lo- cated in phase 1 （80E）, the frequency of rainstorm in Guangxi decreased; but when the MJO-convection center was located in phase 3 （120E）, the frequency of rainstorm increased. The precipitation in Guangxi was closely related to the equatorial MJO convection and the mid latitude intraseasonal oscillation. When the intensity of MJO convection in the equatorial region became stronger and moved toward the north, the pre- cipitation in Guangxi increased; in other words, when the intensity of MJO convection in the equatorial re- gion was weaker, the precipitation in Guangxi decreased.

关 键 词：MJO 暴雨 广西 

分 类 号：P46[天文地球—大气科学及气象学]