春季亚洲地面湿度异常对月、季气候影响的模拟研究

通过大气环流模式试验,研究了春季亚洲中纬带地面湿度异常对其后4个月月平均气候参数的影响.结果发现:正的地面湿度异常对其后气候参数的影响在第1个月最弱,第3个月最强;它导致欧亚中高纬带在第2～4个月对流层内的高度和温度都降低,低值系统发展,副热带高压亦发展,中纬度西风急流相应增强;同时北美东岸有明显的遥相关响应.

The Impact of the Ground Wetness Anomalies in Spring on the Climate of Following Months

The impact of anomalous ground wetness (GW) in spring over Asian mid-latitudes on the monthly climatic parameters in the following four months is investigated with a GCM experiment. The main results are summarized as follows: the effect of positive GW anomalies on the monthly climatic parameters is the weakest for the first following month and the strongest for the third following months; the positive anomalous GW leads to decreases of both height and temperature in the whole troposphere over most mid-high latitudes of Asia for all following four months, to developments of both the depressions in mid-high latitudes and the subtropical high, and thus to intensification of the westerly jet; and some evidences of teleconnection remarkably appear in the atmospheric circulation over the east coast of North America.