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    Anomalous current structure in the eastern equatorial Indian Indian Ocean during the south-west monsoon of 1994

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    Mar_Freshwat_Res_52_727.pdf (2.024Mb)
    Date
    2001
    Author
    Unnikrishnan, A.S.
    Murty, V.S.N.
    Babu, M.T.
    Gopinathan, C.K.
    Charyulu, R.J.K.
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    Abstract
    Analysis of hydrographic data collected along 80 degrees, 84 degrees and 88 degrees E between 5 degrees N and 3 degrees S during peak south-west monsoon (July-August) of the eastern equatorial Indian Ocean (EEIO) reveals thermohaline variability and anomalous current structure in the upper ocean. A warm (28.4-28.8 degrees C) and less-saline (33 to 34.8) deep (60-75 m) homogeneous layer characterizes the surface mixed layer. The south-west monsoon current, advecting the Arabian Sea High Salinity Water eastwards, appears as an eastward undercurrent (approx. 50 cm s sup(-1)) below 125 m at 80 degrees E between 1 degree and 1.5 degrees N and in the upper 100 m in the vicinity of the equator with an eastward increase of core velocity between 75 and 100 m. This undercurrent has a transport of 4 Sv at 80 degrees E. The westward flow in the upper layers north of he equator is anomalous, as the surface winds have an eastward zonal component. The associated westward transport is 44 Sv between 84 degrees and 88 degrees E. The equatorial westward flow appears to be influenced by the anomalously strong north-westward coastal current off Sumatra and westward propagating Rossby waves
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    http://drs.nio.org/drs/handle/2264/1590
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