Mr. Venugopal R. Thandlam Profile

Venugopal R. Thandlam

PhD Student at Uppsala Univ

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Proceedings Article | 9 May 2016 Paper

Evaluation of MODIS/CERES downwelling shortwave and longwave radiation over global tropical oceans

Venugopal T., H. Rahaman, M. Ravichandran, S. S. V. Ramakrishna

Proceedings Volume 9876, 98761F (2016) https://doi.org/10.1117/12.2228041

KEYWORDS: Curium, Shortwaves, Clouds, Satellites, Climatology, Data modeling, Information operations, Solar radiation models, Imaging systems, Environmental sensing

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In the present work, we have evaluated the satellite estimated daily downwelling shortwave (Q_I) and Longwave (Q_A) radiation from Moderate Resolution Imaging Spectrometer (MODIS) /Clouds and the Earth's Radiant Energy System (CM) with moored buoy observations of Global Tropical Moored Buoy Array (GTMBA) during 2001-2009. The global observed mean of Q_I and Q_A in GTMBA (CM) are 228 (233) W/m² and 410 (405) W/m² respectively. The mean Q_I shows a positive bias (~3- 7 W/m²) whereas Q_A underestimates with a mean negative bias of ~3-6 W/m² in the tropical Pacific, Atlantic and Indian Ocean. CM underestimates the buoy observed variability in both Q_I and Q_A in all the tropical oceans. The correlation coefficient (CC) values in Q_I (Qa) are 0.79(0.88) 0.79(0.84) and 0.81(0.94) over the Pacific, Atlantic and Indian ocean respectively. The Root Mean Square Error (RMSE) values in Q_I ranged between 35-43 W/m² with lowest values in the Atlantic Ocean and highest in the Indian Ocean. The RMSE values in Q_A are less as compared to Q_I and it is ~9 W/m² in all the tropical ocean. The spatial distributions of Q_I and Q_A shows seasonality with lower and higher values coinciding with the Inter Tropical Convergence Zone(ITCZ) locations in the Q_I and Q_A.

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