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Hydrographical characteristics and oxygen isotopic signatures of water in a coastal environment (Mangalore) along the southeastern Arabian Sea |
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| Authors: | Josia Jacob Prosenjit Ghosh A P Dineshbabu P Sabu K Srinivas Bindu Sulochanan |
| Institution: | 1. Centre for Earth Sciences, Indian Institute of Science, Bangalore, 560 012, India 5. Divecha Centre for Climate Change, Indian Institute of Science, Bangalore, 560 012, India 2. Mangalore Research Centre of Central Marine Fisheries Research Institute, Indian Council of Agricultural Research, Mangalore, 575 001, India 3. National Centre for Antarctic and Ocean Research, Ministry of Earth Sciences, Goa, 403 804, India 4. Indian National Centre for Ocean Information Services, Ministry of Earth Sciences, Hyderabad, 500 090, India |
| Abstract: | Coastal marine environments are important links between the continents and the open ocean. The coast off Mangalore forms part of the upwelling zone along the southeastern Arabian Sea. The temperature, salinity, density, dissolved oxygen and stable oxygen isotope ratio (δ18O) of surface waters as well as those of bottom waters off coastal Mangalore were studied every month from October 2010 to May 2011. The coastal waters were stratified in October and November due to precipitation and runoff. The region was characterised by upwelled bottom waters in October, whereas the region exhibited a temperature inversion in November. The surface and bottom waters presented almost uniform properties from December until April. The coastal waters were observed to be most dense in January and May. Comparatively cold and poorly oxygenated bottom waters during the May sampling indicated the onset of upwelling along the region. δ18O of the coastal waters successfully documented the observed variations in the hydrographical characteristics of the Mangalore coast during the monthly sampling period. We also noted that the monthly variability in the properties of the coastal waters of Mangalore was related to the hydrographical characteristics of the adjacent open ocean inferred from satellite-derived surface winds, sea surface height anomaly data and sea surface temperatures. |
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