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

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

doi:10.1117/12.2228041

9 May 2016 Evaluation of MODIS/CERES downwelling shortwave and longwave radiation over global tropical oceans

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

Proceedings Volume 9876, Remote Sensing of the Atmosphere, Clouds, and Precipitation VI; 98761F (2016) https://doi.org/10.1117/12.2228041
Event: SPIE Asia-Pacific Remote Sensing, 2016, New Delhi, India

Abstract

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.

Citation Download Citation

Venugopal T., H. Rahaman, M. Ravichandran, and S. S. V. S. Ramakrishna "Evaluation of MODIS/CERES downwelling shortwave and longwave radiation over global tropical oceans", Proc. SPIE 9876, Remote Sensing of the Atmosphere, Clouds, and Precipitation VI, 98761F (9 May 2016); https://doi.org/10.1117/12.2228041

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