Influence of Eurasian snow cover in spring on the Indian Ocean Dipole

Climate Research

Hongxi Pang¹  Yuanqing He Aigang Lu Jingdong Zhao Bo Song Baoying Ning Lingling Yuan¹ 

关键词: Eurasian snow cover;    Indian Ocean Dipole;    Ocean–atmosphere coupling;    Atmospheric circulation anomalies;   

DOI  :  10.3354/cr030013

来源: Inter-Research Science Publishing

【 摘 要 】

ABSTRACT: The Indian Ocean Dipole (IOD) shows a significant negative correlation with the extent of Eurasian snow cover in spring. The anomalies in the land–sea temperature contrast, which are induced by the anomalies of Eurasian snow cover in spring, reverse the patterns of convection activity anomalies over the western and eastern tropical Indian Ocean in summer. Moreover, for heavier and lighter than normal Eurasian snow cover in spring, anomalies in the vertical zonal circulation over the tropical Indian Ocean (Walker circulation) and in the vertical meridional circulation between the Indian Ocean and the Eurasian continent (Hadley circulation) occur in summer. The Walker and Hadley circulation anomalies probably play an important role in the occurrence and duration of IOD events. Eurasian snow cover in spring is presumably one of the factors that trigger IOD events. These results provide a basis for further investigation of the mechanisms linking snow cover, the Indian monsoon, atmospheric circulation, and sea surface temperature.

【 授权许可】

Unknown