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Sea Level Expression of Intrinsic and Forced Ocean Variabilities at Interannual Time Scales

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      A dipole mode in the tropical Indian Ocean.

      For the tropical Pacific and Atlantic oceans, internal modes of variability that lead to climatic oscillations have been recognized, but in the Indian Ocean region a similar ocean-atmosphere interaction causing interannual climate variability has not yet been found. Here we report an analysis of observational data over the past 40 years, showing a dipole mode in the Indian Ocean: a pattern of internal variability with anomalously low sea surface temperatures off Sumatra and high sea surface temperatures in the western Indian Ocean, with accompanying wind and precipitation anomalies. The spatio-temporal links between sea surface temperatures and winds reveal a strong coupling through the precipitation field and ocean dynamics. This air-sea interaction process is unique and inherent in the Indian Ocean, and is shown to be independent of the El Niño/Southern Oscillation. The discovery of this dipole mode that accounts for about 12% of the sea surface temperature variability in the Indian Ocean--and, in its active years, also causes severe rainfall in eastern Africa and droughts in Indonesia--brightens the prospects for a long-term forecast of rainfall anomalies in the affected countries.
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        On the meridional extent and fronts of the Antarctic Circumpolar Current

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          Interdecadal Modulation of ENSO Teleconnections

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            Author and article information

            Journal
            Journal of Climate
            J. Climate
            American Meteorological Society
            0894-8755
            1520-0442
            November 2011
            November 2011
            : 24
            : 21
            : 5652-5670
            10.1175/JCLI-D-11-00077.1
            © 2011

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