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Observations of currents over the deep southern Bay of Bengal-with a little luck

TitleObservations of currents over the deep southern Bay of Bengal-with a little luck
Publication TypeJournal Article
Year of Publication2016
AuthorsWijesekera H.W, Teague W.J, Jarosz E., Wang D.W, Jensen T.G, Jinadasa S.UP, Fernando H.JS, Centurioni LR, Hallock Z.R, Shroyer E.L, Moum J.N
Date Published2016/06
Type of ArticleArticle
ISBN Number1042-8275
Accession NumberWOS:000380572500015
Keywordsarabian sea; circulation; coastal current; mixed-layer; north indian-ocean; of-bengal; southwest monsoon; sri-lanka; summer monsoon; variability

Long-term time series of velocity, hydrographic, and turbulence fields were collected from a six-element subsurface mooring array in the southern Bay of Bengal. The moorings, deployed in December 2013 and recovered in August 2015, were entangled with commercial fishing nets and lines, while top subsurface buoys ended up being serendipitously closer to the surface than planned. In spite of these unexpected events, almost all the sensors and data were recovered. The moorings provided currents between 6 m and 500 m depths from acoustic Doppler current profilers, supplemented by hydrographic data and turbulent dissipation rates at selected depths. The observations captured the summer and winter monsoon currents, eddies, and intraseasonal oscillations. Near-surface currents as large as 1.75 m s(-1) were observed in July 2014. Currents stronger than 0.5 m s(-1) were confined to the upper 200 m. Observations of currents, temperature, and sea surface height (SSH) fields revealed eddylike features with positive and negative SSH anomalies (similar to 20 cm) moving westward at speeds of about 0.1 m s(-1). Intraseasonal oscillations with periods of 30 to 90 days were strongest near the surface. For the duration of the deployment, root-mean-square velocity fluctuations were about 0.1 m s(-1) near the surface but decayed with depth and became nearly uniform (similar to 0.03-0.06 m s(-1)) below 100 m.

Short TitleOceanography
Student Publication: