The monsoon currents in the north Indian Ocean (Downloadable article) [WorldCat.org]
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The monsoon currents in the north Indian Ocean

Author: Shankar, D; Vinayachandran, PN; Unnikrishnan, AS
Publisher: Elsevier Science
Edition/Format:   Downloadable article : English
Publication:Shankar, D and Vinayachandran, PN and Unnikrishnan, AS (2002) The monsoon currents in the north Indian Ocean. In: Progress in Oceanography, 52 (1). pp. 63-120.
Summary:
The monsoon currents are the seasonally reversing, open-ocean currents that flow between the Arabian Sea and the Bay of Bengal, the two wings of the north Indian Ocean. The Summer Monsoon Current (SMC) flows eastward during the summer monsoon (May-September) and the Winter Monsoon Current (WMC) flows westward during the winter monsoon (November-February). We assemble data on ship drifts, winds and Ekman drift, and  Read more...
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Details

Genre/Form: Journal Article
PeerReviewed
Material Type: Internet resource
Document Type: Internet Resource, Article
All Authors / Contributors: Shankar, D; Vinayachandran, PN; Unnikrishnan, AS
OCLC Number: 1061272043
Language Note: English
Notes: application/pdf

Abstract:

The monsoon currents are the seasonally reversing, open-ocean currents that flow between the Arabian Sea and the Bay of Bengal, the two wings of the north Indian Ocean. The Summer Monsoon Current (SMC) flows eastward during the summer monsoon (May-September) and the Winter Monsoon Current (WMC) flows westward during the winter monsoon (November-February). We assemble data on ship drifts, winds and Ekman drift, and geostrophic Currents derived from altimetry and hydrography to describe the observed climatological seasonal cycle of the monsoon currents. We then use an Oceanic General Circulation Model (OGCM) to simulate these currents and estimate their transports, and a 11/2-layer reduced-gravity model to investigate the processes that force them. The monsoon currents extend over the entire basin, from the Somali coast to the eastern Bay of Bengal. They do not, however, come into being, or decay, over this entire region at a given time. Different parts of the currents form at different times, and it is only in their mature phase that the currents exist as trans-basin flows. The westward WMC first forms south of Sri Lanka in November and is fed initially by the equatorward East India Coastal Current (EICC); the westward WMC in the southern Bay appears later. In its mature phase during December-March, the WMC flows westwards across the southern Bay; it divides into two branches in the Arabian Sea. One of these branches continues flowing westwards, whereas the other turns around the Lakshadweep high (a sea-level high off southwest India) to flow into the poleward West India Coastal Current (WICC). The WMC is primarily a geostrophic current, modulated by Ekman drift. The eastward flowing SMC first appears in the southern Bay during May. In its mature phase, which peaks with the summer monsoon in July, the SMC in the Arabian Sea is a continuation of the Somali Current and the coastal Current off Oman. It flows eastward and southeastward across the Arabian Sea and around t

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