Ozone and water vapour are two important climate relevant trace gases in the atmosphere, and temperature is one of the most significant climate parameters. Therefore, careful and consistent monitoring of these gases and temperature is essential for understanding temporal and spatial changes of these parameters in the past and thus, predicting expected changes of climate in future.

Long-term monitoring of trace gases also demands novel techniques and new sensors for continued environmental surveillance. The INSAT-3D/3DR instruments are the contributions of India towards understanding temporal evolution and spatial variability of these traces gases, and their connection with climate.

Since it is necessary to validate new measurements prior to their scientific use, we propose the validation and accuracy estimation of ozone, temperature and water vapour retrievals of the INSAT- 3D/3DR measurements. These validated measurements then will be used for the studies on Monsoon Inversion over the north Indian Ocean region and ozone-ENSO relationships in the tropics.