An undercurrent off the east coast of Sri Lanka

TitleAn undercurrent off the east coast of Sri Lanka
Publication TypeJournal Article
Year of Publication2017
AuthorsAnutaliya A., Send U, McClean JL, Sprintall J, Rainville L, Lee CM, Jinadasa S.UP, Wallcraft A.J, Metzger E.J
JournalOcean Science
Volume13
Pagination1035-1044
Date Published2017/12
Type of ArticleArticle
ISBN Number1812-0784
Accession NumberWOS:000417287000001
Keywordsbengal currents; circulation; currents; equatorial; monsoon current; north indian-ocean; salinity; seasonal variability; southern bay; topex/poseidon; transports
Abstract

The existence of a seasonally varying undercurrent along 8 degrees N off the east coast of Sri Lanka is inferred from shipboard hydrography, Argo floats, glider measurements, and two ocean general circulation model simulations. Together, they reveal an undercurrent below 100-200 m flowing in the opposite direction to the surface current, which is most pronounced during boreal spring and summer and switches direction between these two seasons. The volume transport of the undercurrent (200-1000 m layer) can be more than 10 Sv in either direction, exceeding the transport of 1-6 Sv carried by the surface current (0-200 m layer). The undercurrent transports relatively fresher water southward during spring, while it advects more saline water northward along the east coast of Sri Lanka during summer. Although the undercurrent is potentially a pathway of salt exchange between the Arabian Sea and the Bay of Bengal, the observations and the ocean general circulation models suggest that the salinity contrast between seasons and between the boundary current and interior is less than 0.09 in the subsurface layer, suggesting a small salt transport by the undercurrent of less than 4 % of the salinity deficit in the Bay of Bengal.

DOI10.5194/os-13-1035-2017
Short TitleOcean Sci.
Student Publication: 
Yes
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