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Connection of sea level variability between the tropical western Pacific and the southern Indian Ocean during recent two decades

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Abstract

Based on the merged satellite altimeter data and in-situ observations, as well as a diagnosis of linear baroclinic Rossby wave solutions, this study analyzed the rapidly rise of sea level/sea surface height (SSH) in the tropical Pacific and Indian Oceans during recent two decades. Results show that the sea level rise signals in the tropical west Pacific and the southeast Indian Ocean are closely linked to each other through the pathways of oceanic waveguide within the Indonesian Seas in the form of thermocline adjustment. The sea level changes in the southeast Indian Ocean are strongly influenced by the low-frequency westward-propagating waves originated in the tropical Pacific, whereas those in the southwest Indian Ocean respond mainly to the local wind forcing. Analyses of the lead-lag correlation further reveal the different origins of interannual and interdecadal variabilities in the tropical Pacific. The interannual wave signals are dominated by the wind variability along the equatorial Pacific, which is associated with the El Niño-Southern Oscillation; whereas the interdecadal signals are driven mainly by the wind curl off the equatorial Pacific, which is closely related to the Pacific Decadal Oscillation.

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Authors and Affiliations

  1. State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China

    TianYu Wang, Yan Du & Wei Zhuang

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    TianYu Wang

  3. Scripps Institution of Oceanography, La Jolla, California, 92093, USA

    JinBo Wang

Authors
  1. TianYu Wang
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  2. Yan Du
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  3. Wei Zhuang
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  4. JinBo Wang
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Correspondence to Yan Du.

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Wang, T., Du, Y., Zhuang, W. et al. Connection of sea level variability between the tropical western Pacific and the southern Indian Ocean during recent two decades. Sci. China Earth Sci. 58, 1387–1396 (2015). https://doi.org/10.1007/s11430-014-5048-4

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  • DOI: https://doi.org/10.1007/s11430-014-5048-4

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