摘要
使用1961～2013年广西80个气象观测站的日降水资料和NOAAOLR、NCEP／NCAR风场、高度场再分析资料。结果表明：当MJO第10位相时广西降水偏多，第1位相时偏少，第2位相时偏多，第3位相时大部偏少的周期性分布特征。原因可能为副热带高压随着MJ0向东移动而减弱东移，而且影响着中高纬度地区的波列分布和转播，当MJO对流位于第10、2位相时，形成的槽脊位置有利冷空气南下影响广西，使降水发生；在MJO对流所处位相向东移动过程中，当位于印度洋西部时孟加拉湾水汽输送到达广西最强，随着逐渐向东减弱，当位于第2位相以后，广西上空水汽输送来源转为南海地区。从不同位相来看。当MJO对流位相距离广西稍远时，MJO不同位相时哈德莱上升支的主要区别在上升气流高度略有不同和高空的强上升气流区分布范围不同。
Based on the daily precipitation data, NOAA OLR data and NCEP/NCAR monthly reanalysis data during 1961-2013, The results show that： there is a periodic distribution that the more rainfall in Guangxi when the MJO convection center is located in phase 10, and less rainfall in phase 1, and more in phase 2, and less in phase 3. The dynamical mechanism of that may be the moving eastward of MJO convection center leads to the subtropical high shift eastward and to be weakened, and also affects the distribution and broadcast of the wave in middle and high latitudes, when MJO convection center is located in phase 10, 2, the trough and ridge position are favorable of the cold air southward and the precipitation occurred in Guangxi. When MJO convection center move eastward to India Ocean and is located over the western Bay of Bengal, the strongest water vapor transport to Guangxi. The water vapor from South China Sea transport to Guangxi when MJO convection center move eastward and is located in phase 2. The slightly difference of the height and the altitude of the strong updraft of Hadley updraft when the MJO convection center far from Guangxi.
出处
《气象研究与应用》
2015年第1期25-30,共6页
Journal of Meteorological Research and Application
基金
广西自然科学基金资助(2013GXNSFBB053010)
广西自然科学基金资助(2013GXNSFAA019273)共同资助
