Principal modes of the boreal wintertime SSTA in the South Pacific and their relationships with the ENSO

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Principal modes of the boreal wintertime SSTA in the South Pacific and their relationships with the ENSO[J]. Haiyang Xuebao, 2012, 34(2): 48-56.

Citation:

Principal modes of the boreal wintertime SSTA in the South Pacific and their relationships with the ENSO[J]. Haiyang Xuebao, 2012, 34(2): 48-56.

Principal modes of the boreal wintertime SSTA in the South Pacific and their relationships with the ENSO[J]. Haiyang Xuebao, 2012, 34(2): 48-56.

Citation:

Principal modes of the boreal wintertime SSTA in the South Pacific and their relationships with the ENSO[J]. Haiyang Xuebao, 2012, 34(2): 48-56.

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Principal modes of the boreal wintertime SSTA in the South Pacific and their relationships with the ENSO

1.
Institute of Meteorology,PLA University of Science and Technology,Nanjing 211101,China
2.
Institute of Meteorology,PLA University of Science and Technology,Nanjing 211101,China;LASG,Institute of Atmnospheric Physis, Chinese Academyof Sciences,Beijing 100029,China
3.
Institute of Meteorology,PLA University of Science and Technology,Nanjing 211101,China;No. 94162 Unit of PLA,Xi’an 710614, China

Received Date: 2011-03-13
Rev Recd Date: 2011-05-31

Abstract

Abstract

Based on the monthly-mean Extended Reconstruction sea surface temperature data (ERSST. V3) from NOAA, the primary modes of the boreal wintertime (December-next year’s Feburary) SST anomalies (SSTA) from 1950/1951 to 2008/2009 in the South Pacific and their relationships with ENSO are studied. The results show that there are two dominant modes in the boreal wintertime of South Pacific, and the first mode with a periodicity of 11-16 a represents an interdecadal fluctuation with response in the north part of South Pacific and out of phase fluctuations of moderate amplitude in the south part of South Pacific,the second mode with a periodicity of 18-24 a also has an interdecadal nature with larger response in the west of South Pacific and out of phase fluctuations of smaller amplitude in the east of South Pacific. The interannual timescale characteristic of the two modes aren’t evident. The first mode coincides well with the occurrence of the ENSO event, and the second mode has an impact on the occurrence of ENSO in the next year. In order to study their interannual and interdecadal characteristic, their time series have been high-pass filtered and low-pass filtered respectively. After filtering, the relationship between the two modes and ENSO is consonant with the relationship before filtering in the interannual time scale. In the interdecadal time scale, the interdecadal variations of the first mode may respond to the interdecadal variations of ENSO event, and the second mode may not only have response to the former ENSO event but also have impact on the latter ENSO event to some extent.
- the South Pacific ocean,
- sea surface temperature modes,
- boreal wintertime,
- ENSO,
- interaction

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References(22)

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