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Comparison of Grid Averaged Altimeter and Buoy Significant Wave Heights in the Northern Indian Ocean

Sabique, L and Balakrishnan Nair, TM and Srinivas, K and Nayak, SR (2013) Comparison of Grid Averaged Altimeter and Buoy Significant Wave Heights in the Northern Indian Ocean. Marine Geodesy, 36 (1). pp. 72-85.

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A quantitative comparison of the collocated inter-annual significant wave height (SWH) data collected between 2006 and 2009 from buoys and altimeters at nine buoy locations (total n = 2241) in the Northern Indian Ocean is attempted for assessing the validity of daily averaged gridded altimeter significant wave height (ASWH) provided by AVISO for operational use. ASWH is underestimated by 0.20 m, the root-mean-square error (RMSE) is less than 0.30 m, the Scatter Index is less than 20, and the correlation coefficient is greater than 0.90. Further, at three locations, the examination of the above statistics showed that the bias and RMSE is high during the southwest monsoon season compared with the Northeast monsoon. Scatter Index showed only slight variation (14-18) for different ranges of SWH. The response of the daily average gridded ASWH data during extreme conditions (cyclones) in the vicinity of the buoy locations is poor at all compared buoy locations. The gridded ASWH from different satellite missions provided by AVISO can be used for basin scale validation experiments of the wave model and for climatological studies in the Indian Ocean, except during cyclone conditions.

Item Type: Article
Additional Information: Copyright of this article belongs to Taylor & Francis
Uncontrolled Keywords: Validation;Northern Indian Ocean;satellite altimeter; significant wave height;ocean buoys;tropical cyclones
Subjects: Oceanography > oceanography
Depositing User: INCOIS Library
Date Deposited: 14 Dec 2013 05:34
Last Modified: 14 Dec 2013 05:34

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