摘要
文章研究了欧亚春季雪盖对印度洋偶极子的影响。研究发现,欧亚春季雪盖与印度洋偶极子关系密切,两者之间存在显著的反相关关系。欧亚春季雪盖异常导致夏季赤道印度洋垂直纬向环流以及印度洋和欧亚大陆之间的垂直经向环流发生异常,是欧亚春季雪盖与印度洋偶极子存在反相关关系的主要原因。欧亚春季雪盖异常可能是印度洋偶极子发生的一个重要的外在诱发因子。
The influence of Eurasian snow cover in spring on Indian Ocean Dipole (IOD) was first studied in this paper. The results indicate that IOD is significantly correlated negatively with Eurasian snow cover extent in spring. The anomalies of Eurasian snow cover in spring bring about the anomalies of the vertical zonal circulation over the equatorial Indian Ocean and the vertical meridional circulation between the Indian Ocean and Eurasian continent in summer. The anomalies of the vertical zonal and meridional circulations play an important role in occurrence of the Indian Ocean Dipole and its maintaining, leading a significantly negative correlation between the Eurasian snow cover in spring and the Indian Ocean Dipole. It is presumable that the Eurasian snow cover in spring as one of the causal factors could trigger IOD events. The results in the paper are important for us to further investigate the links between snow cover, atmosphere circulation and sea temperature and the possible mechanisms between them.
出处
《地理科学》
CSCD
北大核心
2006年第6期682-686,共5页
Scientia Geographica Sinica
基金
国家自然科学基金资助项目(40501014
90511007)
中国科学院创新团队国家合作伙伴计划项目(CXTD-Z2005-2)
中国科学院特殊学科人才培养基金项目(J0130084)资助
关键词
欧亚雪盖
印度洋偶极子
Eurasian snow cover
Indian Ocean Dipole