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Evaluation of GODAS Using RAMA Mooring Observations from the Indian Ocean

Pandey, Vivek Kumar and Kurtakoti, Prajvala (2014) Evaluation of GODAS Using RAMA Mooring Observations from the Indian Ocean. In: MARINE GEODESY, 37 (1). pp. 14-31.

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Official URL: http://dx.doi.org/10.1080/01490419.2013.859642


We present a comparison of the Global Ocean Data Assimilation System (GODAS) five-day ocean analyses against in situ daily data from Research Moored Array for African-Asian-Australian Monsoon Analysis and Prediction (RAMA) moorings at locations 90 degrees E, 12 degrees N; 90 degrees E, 8 degrees N; 90 degrees E, 0 degrees N and 90 degrees E, 1.5 degrees S in the equatorial Indian Ocean and the Bay of Bengal during 2002-2008. We find that the GODAS temperature analysis does not adequately capture a prominent signal of Indian Ocean dipole mode of 2006 seen in the mooring data, particularly at 90 degrees E 0 degrees N and 90 degrees E 1.5 degrees S in the eastern India Ocean. The analysis, using simple statistics such as bias and root-mean-square deviation, indicates that standard GODAS temperature has definite biases and significant differences with observations on both subseasonal and seasonal scales. Subsurface salinity has serious deficiencies as well, but this may not be surprising considering the poorly constrained fresh water forcing, and possible model deficiencies in subsurface vertical mixing. GODAS reanalysis needs improvement to make it more useful for study of climate variability and for creating ocean initial conditions for prediction.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the TAYLOR & FRANCIS INC, 520 CHESTNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA
Keywords: tropical convergence zone; RAMA; VPS; mooring; Indian Ocean dipole; GODAS; intra-seasonal variability; CFS
Department/Centre: Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited: 23 Apr 2014 07:39
Last Modified: 23 Apr 2014 07:40
URI: http://eprints.iisc.ac.in/id/eprint/48882

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