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| Abstract: | Of the several physical processes occurring in the sea, vertical motions have special significance because of their marked effects on the oceanic environment. upwelling is the process in the sea whereby subsurface layers move up towards the surface. The reverse process of surface water sinking to subsurface depths is called sinking. Upwelling is a very conspicuous feature along the west coasts of continents and equatorial regions, though upwelling also occurs along certain east coasts of continents and other regions, The Thesis is an outcome of some investigations carried out by the author on upwelling and sinking off the west and east coasts of India. The aim of the study is to find out the actual period and duration of upwelling and sinking, their driving mechanism, various associated features and the factors that affect these processes. It is achieved by analysing the temperature and density fields off the west and east coasts of India, and further conclusions are drawn from the divergence field of surface currents, wind stress and sea level variations. |
| Description: | School of marine sciences, Cochin University of Science And Technology |
| URI: | http://dyuthi.cusat.ac.in/purl/3320 |
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| Dyuthi-T1291.pdf | (9.364Mb) |
| URI: | http://dyuthi.cusat.ac.in/purl/1154 |
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| Basil Mathew 1983.PDF | (308.5Kb) |
| Abstract: | In the present study the availability of satellite altimeter sea level data with good spatial and temporal resolution is explored to describe and understand circulation of the tropical Indian Ocean. The derived geostrophic circulations showed large variability in all scales. The seasonal cycle described using monthly climatology generated using 12 years SSH data from 1993 to 2004 revealed several new aspects of tropical Indian Ocean circulation. The interannual variability presented in this study using monthly means of SSH data for 12 years have shown large year-to-year variability. The EOF analysis has shown the influence of several periodic signals in the annual and interannual scales where the relative strengths of the signals also varied from year to year. Since one of the reasons for this kind of variability in circulation is the presence of planetary waves. This study discussed the influence of such waves on circulation by presenting two cases one in the Arabian Sea and other in the Bay of Bengal. |
| URI: | http://dyuthi.cusat.ac.in/purl/2506 |
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| Dyuthi-T0670.pdf | (23.75Mb) |
| URI: | http://dyuthi.cusat.ac.in/purl/1691 |
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| Thermocline var ... c propagation,Chap-1&2.PDF | (59.49Mb) |
| Thermocline var ... c propagation,Chap-3-4.PDF | (21.16Mb) |
| Thermocline var ... c propagation,Chap-5-6.PDF | (22.01Mb) |
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