INCOIS-GODAS

The INCOIS-GODAS (Indian National Centre for Ocean Information Services-Global Ocean Data Assimilation System), a modified version of NCEP-GODAS (National Centre for Environmental Prediction-Global Ocean Data Assimilation System), is an Ocean General Circulation Model (OGCM) with assimilation capabilities. The OGCM is Modular Ocean Model-4.0 (MOM-4.0). The assimilation schemes used in INCOIS-GODAS is 3DVAR and Newtonian relaxation (Nudging). The 3DVAR assimilation scheme is used to assimilate observed temperature and salinity profiles, in the top 700m, from observational platforms like Argo, Moored buoys (RAMA, PIRATA/TRITON, TAO, NIOT buoys etc.), and ship-based (XBT, CTD, XCTD, etc.). Using the Newtonian relaxation scheme the model SST is nudged towards satellite blended gridded fields of SST.

Major differences between NCEP-GODAS and INCOIS-GODAS

Data Products

The INCOIS-GODAS runs every day to provide global ocean analysis of temperature, salinity, sea surface height, and currents from the surface to the bottom of the ocean on real time basis (products are available with just 1-day delay). Various tailor made products (ElNino indices, Global maps of monthly SST anomalies, depth-wise distribution of temperature anomalies, TCHP, etc.) are also being made available using these INCOIS-GODAS ocean analysis.Ocean analysis data from INCOIS-GODAS is available for free from 2003 to till date on INCOIS ftp server (ftpser.incois.gov.in) and also on INCOIS Live Access Server (las.incois.gov.in ; under ocean analysis folder). For data access, users are requested to contact

Dr. Abhisek Chatterjee, Scientist D, INCOIS

E-mail: abhisek.c@incois.gov.in

In case of utilizing the products of INCOIS-GODAS we ask you to kindly cite the following paper

Sivareddy, S., 2015, A study on global ocean analysis from an ocean data assimilation system and its sensitivity to observations and forcing fields. Ph.D. thesis, Andhra University

Ravichandran, M., D. Behringer, S. Sivareddy, M. Girishkumar, N. Chacko, and R. Harikumar, 2013: Evaluation of the global ocean data assimilation system at INCOIS: The tropical Indian Ocean. Ocean Modelling, 69, 123-135.

Publications

• Sivareddy, S., Ravichandran, M., Girishkumar, M.S., & Prasad, K.V.S.R. (2015). Assessing the impact of various wind forcing on INCOIS-GODAS simulated ocean currents in the equatorial Indian Ocean. Ocean Dynamics, 65, 1235–1247.
• Bell, M.J., Schiller, A., Le Traon, P.-Y., Smith, N.R., Dombrowsky, E., & Wilmer-Becker, K. (2015). An introduction to GODAE OceanView. Journal of Operational Oceanography, 8(sup1), s2–s11.
• Mukherjee, A., Shankar, D., Fernando, V., Amol, P., Aparna, S. G., Fernandes, R., Michael, G. S., Khalap, S. T., Satelkar, N. P., Agarvadekar, Y., Gaonkar, M. G., Tari, A. P., Kankonkar, A., & Vernekar, S. (2014). Observed seasonal and intraseasonal variability of the East India Coastal Current on the continental slope. Journal of Earth System Science, 1–36.
• Pandey, V.K., & Kurtakoti, P. (2014). Evaluation of GODAS using RAMA mooring observations from the Indian Ocean. Marine Geodesy, 37(1), 14–31.
• Sengupta, S., Parekh, A., Chakraborty, S., Ravikumar, K., & Bose, T. (2013). Vertical variation of oxygen isotope in Bay of Bengal and its relationships with water masses. Journal of Geophysical Research: Oceans, 118(12), 6411–6424.
• Ravichandran, M., Behringer, D., Sivareddy, S., Girishkumar, M.S., Chacko, N., & Harikumar, R. (2013). Evaluation of the Global Ocean Data Assimilation System at INCOIS: The Tropical Indian Ocean. Ocean Modelling, 69, 123–135. doi:10.1016/j.oceamod.2013.05.003
• Ramu, V., Patnaik, K.V.K.R., Prasad, K.V.S.R., Arunkumar, S.V.V., & Acharyulu, P.S.N. (2012). Upper Ocean thermal features during Tropical Cyclones over Bay of Bengal. International Journal of Innovative Research and Development, 1(10).
• Ravichandran, M., Behringer, D., Sivareddy, S., Girishkumar, M.S., Chacko, N., & Harikumar, R. (2011). INCOIS-GODAS-MOM: Ocean Analysis for the Indian Ocean: Configuration, Validation and Product Dissemination. INCOIS Technical Report, No. INCOIS-MOG-TR-2011-06.