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GEOPHYSICAL RESEARCH LETTERS,
VOL. 34,
L10811,
6 PP., 2007
doi:10.1029/2006GL028341
An ITCZ-like convergence zone over the Indian Ocean in boreal late autumn
Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
Center for Climate System Research, University of Tokyo, Kashiwa, Japan
We examined the convective activity over the tropical Indian Ocean in boreal autumn using satellite-observation data. In November and December, we detected an intertropical convergence zone-like (ITCZ-like) precipitation zone between Maldives and Somalia that is unobserved in the other periods of the year. It accompanied a high sea-surface temperature (SST) north of the equator, and a cold tongue near the equator, similar to the ITCZs over the Pacific and Atlantic Oceans. However, the formation mechanism of the SST anomalies over the Indian Ocean is not the same as that in the Pacific and Atlantic Oceans. The high-SST region forms in early November corresponding to weak sea-surface wind during the monsoon transition. The low SST along the equator appears, associated with the upwelling of the subsurface water.
Received 2 October 2006; accepted 19 April 2007; published 26 May 2007.
Citation: (2007), An ITCZ-like convergence zone over the Indian Ocean in boreal late autumn, Geophys. Res. Lett., 34, L10811, doi:10.1029/2006GL028341.
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