Journal
ACTA OCEANOLOGICA SINICA
Volume 34, Issue 5, Pages 22-28Publisher
SPRINGER
DOI: 10.1007/s13131-015-0663-2
Keywords
salinity effect; SSDH; ENSO; Argo; western tropical Pacific
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Funding
- National Program for Support of Top-notch Young Professionals
- National Basic Research Program (973 Program) of China [2012CB417404]
- Chinese Academy Sciences' Project Western Pacific Ocean System: Structure, Dynamics and Consequences (WPOS) [XDA10010405]
- National Natural Science Foundation of China [41176014]
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In this paper, interannual variations of the ocean dynamic height over the tropical Pacific are diagnosed using three-dimensional temperature and salinity fields from Argo profiles, with a focus on the effects of interannually varying salinity on the El Nino-Southern Oscillation (ENSO) evolutions. The diagnostic analyses clearly demonstrate a significant and large role that the salinity field plays in modulating the sea surface dynamic height (SSDH) in the western tropical Pacific. In particular, the contribution of the interannually varying salinity to the interannual variations in SSDH approximately equals to that of the interannually varying temperature. Over the western equatorial Pacific, the salinity variability was responsible for a 30% to 40% reduction in SSDH anomaly in opposition to the thermal build up in SSDH anomaly, providing an important contribution to modulating the seasonal-to-interannual evolution of the tropical Pacific Ocean and affecting the developing of ENSO events.
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