摘要
运用欧洲中期数值天气预报中心的格点资料、天气图和ＯＬＲ资料，计算和分析了１９８０—１９９２年中丰（５年）、歉（５年）和正常（３年）梅雨年各年梅雨期间中低纬度地区的各种平均场和距平场、主要天气系统的活动，发现：它们的平均流场和距平场、垂直经圈环流、副高脊线和ＩＴＣＺ位置、相对湿度场、垂直运动场以及ＯＬＲ场均有重大差异；梅雨强度与西南季风、越赤道气流和副高西南侧的偏东风三者之间汇合的位置以及华北或西北地区较强冷空气的活动关系最为密切；副高对梅雨强度的影响，取决于副高脊线所在的纬度和其西脊点的经度；索马里急流、孟加拉湾一带的西南季风和梅雨三者之间的强度。
The average and anomalous fields on several meteorological elements and the features of important tropical weather systems plentiful and lean and normal mei yu years during 1980—1992 are computed and analyzed using grid point data from ECMWF.It is foud :(1) the mean flow and anomalous fields,maximum relative humidity and vertical motion,locations of subtropical ridge and ITCZ at 850hPa,and vertical meridional circulation and OLR field are quite different between plentiful and lean mei yu years;(2)mei yu intensitry relates to confluence position of southwest monsoon and cross equatorial flow and southeast flow ,and cold air from north or northwest China intruding into mei ye area;(3)the effect of subtropkical high on mei yu intensity depends on the locations of its ridge line and its western ridge point;(4)there are not exact relationships between the intensities of Somali jet and southwest monsoon and mei yu rain.
出处
《热带气象学报》
CSCD
北大核心
1997年第1期47-56,共10页
Journal of Tropical Meteorology
基金
中国气象局气象科学基金
