El Nino事件与中国东部气温异常

EL NINO EVENT ANO THE TEMPERATURE ANOMALIES IN EASTERN CHINA

摘要:

本文进行的多年历史资料的分析表明,中国东部地区的气温异常同El Nino事件有密切的关系 在El Nino年夏季中国东北及附近地区气温多比常年偏低,而在反El Nino年夏季那里气温多出现高温异常。在El Nino年冬季,中国东部广大地区气温比常年偏高:反El Nino年冬季,中国东部广大地区气温比常年编低。中国东部地区的温度异常同El Nino所造成的大气环流异常的关系,本文亦作了分析研究。 中国东部地区冬半年气温的持续编低同El Nino事件的发生有密切关系,表明东亚地区持续的强高空槽活动(寒潮活动)可能是El Nino事件发生的重要触发机制。

Abstract:

According to the data analyses for many years it is clear that the temperature anomalies in Eastern China are closely related to El Nino. The surface temperature in Northeastern China and the neighbouring region is lower than normal buring summer in most of the El Nino years,but it is higher than normal during summer in most of the inverse El Nino years. During the winter associated with El Nino,there are positive anomalies of the temperature in Eastern China,but negative anomalies of the temperature associated with the inverse El Nino. The analyses for the general circulation show that the abovementioned surface temperature anomalies in Eastern China resulted from the anomalous atmospheric circulation causeb by ElNino.There are obvious negative temperature anomalies in Eastern China and obvious positive pressure,anomalies in Mongolia during wintertime prior to the occurrence of El Nino. This means the sustained anomalies of the surface temperature in Eastern China in the wintertime are elosely related to the occurrence of El Nino and the frequent activities of the stronger troughs (cold waves) in East Asia during the wintertime are important mechanism to cause El Nino event.