摘要
The sea level anomalies(SLAs)pattern in the northwestern Pacific delineated significant differences between La Ni?a events occurring with and without negative Indian Ocean Dipole(IOD)events.During the pure La Ni?a events,positive the sea surface level anomalies(SLAs)appear in the northwestern Pacific,but SLAs are weakened and negative SLAs appear in the northwestern Pacific under the contribution of the negative IOD events in 2010/2011.The negative IOD events can trigger significant westerly wind anomalies in the western tropical Pacific,which lead to the breakdown of the pronounced positive SLAs in the northwestern Pacific.Meanwhile,negative SLAs excited by the positive wind stress curl near the dateline propagated westward in the form of Rossby waves until it approached the western Pacific boundary in mid-2011,which maintained and enhanced the negative phase of SLAs in the northwestern Pacific and eventually,it could significantly influence the bifurcation and transport of the North Equatorial Current(NEC).
The sea level anomalies(SLAs) pattern in the northwestern Pacific delineated significant differences between La Ni?a events occurring with and without negative Indian Ocean Dipole(IOD) events. During the pure La Ni?a events, positive the sea surface level anomalies(SLAs) appear in the northwestern Pacific, but SLAs are weakened and negative SLAs appear in the northwestern Pacific under the contribution of the negative IOD events in 2010/2011. The negative IOD events can trigger significant westerly wind anomalies in the western tropical Pacific, which lead to the breakdown of the pronounced positive SLAs in the northwestern Pacific. Meanwhile,negative SLAs excited by the positive wind stress curl near the dateline propagated westward in the form of Rossby waves until it approached the western Pacific boundary in mid-2011, which maintained and enhanced the negative phase of SLAs in the northwestern Pacific and eventually, it could significantly influence the bifurcation and transport of the North Equatorial Current(NEC).
基金
The SOA Program on Global Change and Air-Sea Interactions under contract Nos GASI-IPOVAI-02,GASI-IPOVAI-03 and GASI-03-01-01-04
the National Key Research and Development Program of China under contract Nos 2016YFC1402607,2016YFC1401003 and 2016YFC1401403
the Chinese Academy of Sciences Strategic Leading Science and Technology Projects under contract No.XDA1102030104
the National Natural Science Foundation of China under contract No.41505041
