• Login
    View Item 
    •   DSpace Home
    • Institute's contributions
    • Scholarly literature
    • View Item
    •   DSpace Home
    • Institute's contributions
    • Scholarly literature
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    A biweekly mode in the equatorial Indian Ocean

    Thumbnail
    View/Open
    J_Geophys_Res_C_109_C10003.pdf (2.595Mb)
    Date
    2004
    Author
    Sengupta, D.
    Senan, R.
    Murty, V.S.N.
    Fernando, V.
    Metadata
    Show full item record
    Abstract
    The National Institute of Oceanography, Goa, India, deployed moorings with several subsurface current meters at 0 degrees, 93 degrees E (in February 2000) and 0 degrees, 83 degrees E (in December 2000) in the eastern Indian Ocean. Observed meridional current at all depths has a 10- to 20-day (or biweekly) variability that is distinct from longer period (20- to 60-day) subseasonal variability. Lags between different instruments suggest the presence of groups of westward and vertically propagating biweekly waves with zonal wavelength in the range 2100 to 6100 km. An ocean model forced by high-resolution scatterometer wind stress is used to show that the observed biweekly variability is due to equatorially trapped mixed Rossby-gravity waves generated by subseasonal variability of winds. It is demonstrated that quasi-biweekly fluctuations of surface meridional wind stress resonantly excite ocean waves with westward and upward phase propagation, with a typical period of 14 days and zonal wavelength of 3000-4500 km. The biweekly wave is associated with fluctuating upwelling/downwelling in the equatorial Indian Ocean, with amplitude of 2-3 m per day located 2-3 away from the equator. Possible reasons for eastward intensification of biweekly energy are discussed
    URI
    http://drs.nio.org/drs/handle/2264/1184
    Collections
    • Scholarly literature [9074]

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV
     

     

    Browse

    All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV