ANALYSES OF THE IMPACTS OF EXTRATROPICAL ATMOSPHERE IN THE NORTH PACIFIC ON THE SST AROUND TROPICAL EASTERN PACIFIC DURING ENSO TRANSITION PHASE
XUE Yi-di
WANG Ya-fei
Abstract：Using the composite analysis,correlation analysis and SVD methods,the impacts of extratropical atmosphere in the North Pacific on the sea surface temperature (SST) around tropical eastern Pacific during ENSO transition phase are analyzed by using the global atmospheric reanalysis datasets from NCEP/NCAR,ERSST.V4 from NOAA and ORAS4 from ECMWF.The results are as follows:(1) The positive SLPA of the key area (155～130 °W,10～30 °N) in June are strongly correlated with the negative SSTA around tropical eastern Pacific over the same phase and later.The probability of the positive SLPA in the key area for the E-L type,in which an La Ni(n)a occurs in the following year of El Ni(n)o,is greater than the E-N type,in which no event occurs in the following year of an El Ni(n)o event;(2) The results between the SLP in the North Pacific from March to June and the SST in December by means of SVD methods also confirm the negative correlation between the SLPA in the key area and the SSTA around tropical eastern Pacific;(3)The propagation of the positive phase of OKJ wave train in June may contribute to the positive SLPA in the key area;(4) The positive SLPA in the key area in June may result in more southward surface current velocity anomalies around the key area from July to September,which may contribute to transmit more cold water from the middle latitude to the equator.It may cause the negative SSTA around tropical eastem Pacific in December,to some extent,which may be conducive to the formation of La Ni(n)a.
Keywords：ENSOSLPASSTASVD methodsOKJ wave trainsea surface current anomaly
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：15( 162-176 )