摘要
采用REOF,SVD分析方法,首先指出东北和华北东部气温异常是全国气温异常的第一主分量,进而分析其异常特征及成因。结果表明:全区年、季气温均呈上升趋势,其中冬季增温最大,极端低温较极端高温升高明显。近百年来,全区增温幅度明显高于20世纪全球平均增暖水平。冬季,对流层中、低层上,当纬向西风偏强时,东北和华北东部易高温;而当经向风强盛时,易低温。夏季,气温异常与东北冷涡活动有关;1980年代以来气温显著变暖与对流层中、低层气压场的年代际突变有关。冬夏季气温与东亚冬夏季风、Nino3区海温的关系并不显著,但在1990年代以前,东北夏季低温与ElNi^no的对应关系较好。
It is demonstrated that the temperature anomaly in the Northeast China and the east of North China （NEEN） is the first rotating loading eigenvector of temperature anomaly of China, then its anomaly features and mechanism are studied based on REOF, SVD methods. The main results are as follows： There is warming trend of yearly and seasonal temperatures in the NEEN, especially in winter, and mean minimums temperature increases more obvoius than mean maximum ones; NEEN＇s warming extend is more than 20^th century average warming value of the global in the recent 100 years. On both lower and middle layers of the troposphere in winter, NEEN＇s temperature is higher when west wind is stronger, and it is contrary when longitudinal wind is stronger. In summer, NEEN＇s temperature anomaly is related to the strong or weak stages of Northeastern cold vortex on 500 hPa; It exists some relationship between NEEN＇s warming and pressure field interdecadal variation in lower-middle troposphere from 1980＇s, but their relation isnrt notable between summer/winter temperatures and East Asian summer/winter monsoons, sea surface temperature in Nino 3. The temperature is always lower in the Northeast China when the sea surface temperature is higher in Nino3 before 1990.
出处
《高原气象》
CSCD
北大核心
2005年第6期1024-1033,共10页
Plateau Meteorology
基金
国家自然科学基金项目(40231018)
973计划项目专题(2004CB418507-1)共同资助
关键词
东北
华北东部
气温异常
Nino
3区海温
Northeast China and east of North China
Temperature anomaly
SST of Nino 3
