Assessment of SARAL-ALTIKA Tidal Corrections in the Coastal Oceans Around India |
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| Authors: | R K Nayak M Salim S K Sasamal P C Mohanthy R K Bharadwaj K H Rao |
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| Institution: | 1. National Remote Sensing Centre, ISRO, Balanagar, Hyderabad, India;2. Center for Earth, Atmosphere and Weather Modification Technologies, Jawaharlal Nehru Technological University, Hyderabad, India;3. Indian National Centre for Ocean Information Services, Hyderabad, India;4. National Institute of Technology, Warangal, Telangana, India |
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| Abstract: | The present tidal correction of sea level records of Satellite with ARgoes and ALtimeter (SARAL) is based on the finite element solution (FES) of global tide model FES2012 tidal solution. In this study, we examined the validity of the tidal corrections in the coastal oceans around India using tide gauge measurements and a regional tidal model. Our regional model is based on the barotropic version of the Princeton Ocean Model that is forced by the time-varying tidal levels at the open ocean end based on the global FES99 tidal solution. Tide charts prepared from the simulated tidal levels are very similar to the FES tidal solutions. Comparison with the tide gauge measurement shows close agreement with the regional tidal solutions. On the other hand, the agreement with the FES tide models differ significantly in the Gulf of Khambhat and the Gulf of Kutch on the northwest, and in the Hooghly estuary on the northeast continental shelf. However, the agreement is exceptional in other parts of the study domain. These tidal solutions are used in the SARAL-ALTIKA X-track data to assess the FES tidal correction and to draw some inferences associated with the coastal processes. It is revealed that these corrections are reasonably accurate for the coastal oceans around India except the aforementioned converging channels. |
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| Keywords: | FES2012 India coast SARAL-ALTIKA satellite altimeter tide gauge tides |
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