Sea surface heights obtained from Modular Ocean Model simulation and comparison with Topex/Poseidon data for the Indian Ocean |
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Authors: | P S Swathi K S Yajnik |
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Institution: | (1) Present address: Regal Manor, 2/1 Bride St, 560 025 Langford Town, Bangalore, India;(2) CSIR Centre for Mathematical Modelling and Computer Simulation (C-MMACS), 560 037 Bangalore, India |
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Abstract: | The Modular Ocean Model (MOM) is perhaps the most versatile ocean model available today for the simulation of the large scale
circulation of the ocean. The Topex/Poseidon altimeter which has been operating since September 1992 has been providing sea
surface heights (SSH) of the accuracy of 5–10 cms with a repeat cycle of 10 days. We examine in this paper, the SSH in the
Indian Ocean obtained from a global simulation of MOM with a resolution of 1° in the longitude, 1/3° in the latitude between
30°S and 30°N and 20 levels in the vertical with climatological windforcing and restoring conditions on temperature and salinity.
They are compared with the SSH from the Topex/Poseidon altimeter after suitable filtering in the time domain to remove smaller
time and length scales. In addition, unfiltered data from both sources are analysed by estimating the cross-spectral density
to find the coherence and crossphase at different frequencies. The agreement between the two, over most of the Northern Indian
Ocean, especially the Arabian Sea and the Bay of Bengal is quite good. |
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Keywords: | Topex/Poseidon altimeter Modular Ocean Model Indian Ocean large scale circulation cross-spectral density |
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