Modulation of the SSTA decadal variation on ENSO events and relationships of SSTA With LOD,SOI, etc

Details Modulation of the SSTA decadal variation on ENSO events and relationships of SSTA With LOD,SOI, etc Modulation of the SSTA decadal variation on ENSO events and relationships of SSTA With LOD,SOI, etc

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007acasn..48...36l&link_type=abstract

Acta Astronomica Sinica, vol. 48, no. 1, p. 36-47

Astronomy and Astrophysics

Astronomy

Enso Events, Variations Of The Lod, Anomalies Of The Sst

Scientific paper

Interannual and decadal components of the length of day (LOD), Southern Oscillation Index (SOI) and Sea Surface Temperature anomaly (SSTA) in Nino regions are extracted by band-pass filtering, and used for research of the modulation of the SSTA on the ENSO events. Results show that besides the interannual components, the decadal components in SSTA have strong impacts on monitoring and representing of the ENSO events. When the ENSO events are strong, the modulation of the decadal components of the SSTA tends to prolong the life-time of the events and enlarge the extreme anomalies of the SST, while the ENSO events, which are so weak that they can not be detected by the interannual components of the SSTA, can also be detected with the help of the modulation of the SSTA decadal components. The study further draws attention to the relationships of the SSTA interannual and decadal components with those of LOD, SOI, both of the sea level pressure anomalies (SLPA) and the trade wind anomalies (TWA) in tropic Pacific, and also with those of the axial components of the atmospheric angular momentum (AAM) and oceanic angular momentum (OAM). Results of the squared coherence and coherent phases among them reveal close connections with the SSTA and almost all of the parameters mentioned above on the interannual time scales, while on the decadal time scale significant connections are among the SSTA and SOI, SLPA, TWA, ?3w and ?3w+v as well, and slight weaker connections between the SSTA and LOD, ?3pib and ?3bp

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