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dc.contributor.authorXu, Kang  Concept link
dc.contributor.authorHuang, Rui Xin  Concept link
dc.contributor.authorWang, Weiqiang  Concept link
dc.contributor.authorZhu, Congwen  Concept link
dc.contributor.authorLu, Riyu  Concept link
dc.date.accessioned2017-08-29T18:53:57Z
dc.date.available2018-01-21T09:52:20Z
dc.date.issued2017-07-21
dc.identifier.citationJournal of Climate 30 (2017): 6611-6627en_US
dc.identifier.urihttps://hdl.handle.net/1912/9196
dc.descriptionAuthor Posting. © American Meteorological Society, 2017. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 30 (2017): 6611-6627, doi:10.1175/JCLI-D-16-0291.1.en_US
dc.description.abstractThe interannual fluctuations of the equatorial thermocline are usually associated with El Niño activity, but the linkage between the thermocline modes and El Niño is still under debate. In the present study, a mode function decomposition method is applied to the equatorial Pacific thermocline, and the results show that the first two dominant modes (M1 and M2) identify two distinct characteristics of the equatorial Pacific thermocline. The M1 reflects a basinwide zonally tilted thermocline related to the eastern Pacific (EP) El Niño, with shoaling (deepening) in the western (eastern) equatorial Pacific. The M2 represents the central Pacific (CP) El Niño, characterized by a V-shaped equatorial Pacific thermocline (i.e., deep in the central equatorial Pacific and shallow on both the western and eastern boundaries). Furthermore, both modes are stable and significant on the interannual time scale, and manifest as the major feature of the thermocline fluctuations associated with the two types of El Niño events. As good proxies of EP and CP El Niño events, thermocline-based indices clearly reveal the inherent characteristics of subsurface ocean responses during the evolution of El Niño events, which are characterized by the remarkable zonal eastward propagation of equatorial subsurface ocean temperature anomalies, particularly during the CP El Niño. Further analysis of the mixed layer heat budget suggests that the air–sea interactions determine the establishment and development stages of the CP El Niño, while the thermocline feedback is vital for its further development. These results highlight the key influence of equatorial Pacific thermocline fluctuations in conjunction with the air–sea interactions, on the CP El Niño.en_US
dc.description.sponsorshipThis work is jointly supported by the Funds for Creative Research Groups of China (Grant 41521005), the Special Fund for Public Welfare Industry (GYHY201506013), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant XDA11010301), and the National Natural Science Foundation of China (Grants 41406033, 41475057, 41376024, 41676013) and the CAS/SAFEA International Partnership Program for Creative Research Teams.en_US
dc.language.isoenen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.urihttps://doi.org/10.1175/JCLI-D-16-0291.1
dc.subjectThermoclineen_US
dc.subjectEl Ninoen_US
dc.titleThermocline fluctuations in the equatorial Pacific related to the two types of El Niño eventsen_US
dc.typeArticleen_US
dc.description.embargo2018-01-21en_US
dc.identifier.doi10.1175/JCLI-D-16-0291.1


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