When there are cold SST anomalies in the SCS and the Bay of Bengal and warm anomalies in the western tropical Pacific Ocean, there is anomalous northeasterly over the SCS in February and March.

• 确切地说,南海冷水年份，即南海和孟加拉湾负距平、西太平洋正距平的年份，2，3月份南海有东北风异常；