摘要
利用中国科学院大气物理研究所发展的热带太平洋环流模式（ＯＧＣＭ）和海－气耦合模式（ＣＧＣＭ）分别就冬半年东亚冬季风异常对赤道太平洋的作用进行了数值模拟研究。结果清楚地表明，无论在ＯＧＣＭ中还是在ＣＧＣＭ中，持续的冬季风强异常将引起赤道中东太平洋海表水温（ＳＳＴ）的明显正异常，其分布类似观测到的ＥｌＮｉｎｏ事件；而持续的冬季风弱异常将引起赤道中东太平洋ＳＳＴ的明显负异常，其分布十分类似观测到的ＬａＮｉｎａ事件。因此，数值模拟进一步证实了我们过去从资料诊断和理论分析中得到的结论，即东亚冬季风异常是激发产生ＥＮＳＯ的重要机制。对模式资料的分析还清楚表明，异常东亚冬季风将激发异常海洋Ｋｅｌｖｉｎ波和使热带大气季节内振荡出现强异常，它们是激发ＥＮＳＯ的重要物理因素，这与观测资料的分析结果相一致。
In this paper, we investigate influences of anomalous winter monsoon in East Asia on the equatorial Pacific Ocean with tropical Pacific ocean model (OGCM) and coupled ocean-atmospheric general circulation model (CGCM), respectively. The results clearly show that continually stronger winter monsoon is able to lead to obviously positive sea surface temperature anomaly (SSTA) in the equatorial central and the eastern Pacific Ocean and its horizontal distribution is well identical with the large-scale feature of natural El Ni[AKn～D]o events; however, consecutively weaker winter monsoon will make SST decrease in that area and its pattern can be compared to La Nia. Therefore, numerical experiments further prove the conclusion unraveled based on the observed data diagnoses and theoretical analyses in the previous studies — anomalous winter monsoon in East Asia is an important exciting mechanism of ENSO; the simulation results also show that the anomalous Kelvin waves in the ocean and the anomalies of atmospheric intraseasonal oscillation caused by anomalous winter monsoon play an important role in the occurrence of ENSO as that shown in the observation.
出处
《大气科学》
CSCD
北大核心
1998年第4期481-490,共10页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金
关键词
季风
厄尔尼诺
数值模拟
东亚地区
KELVIN波
East-Asian winter monsoon ENSO Kelvin wave tropical atmospheric intraseasonal oscillation
