Effect of El Niæo observed over Indian continent from satellite-derived ozone data



After the discovery of the ozone hole over Antarctica, assessment of the long-term trend of ozone in different regions of the globe has become a frontline topic of Earth system sciences. Trends in total ozone column (TOC) have been estimated by various authors [McPeters et al., 1996; Hollandsworth et al., 1995] using the data obtained from the Dobson spectrophotometer, satellite-borne instruments, and balloon-borne ozonesondes.

Most such studies are for mid- and highlatitude regions, whereas studies made with data from low-latitude regions are meager. No detailed sensor-based approach has been undertaken so far to understand the total ozone scenario from an Indian perspective, apart from a few observations [Chakrabarty et al., 1998] that were largely based on a ground-based Dobson spectrophotometer at major Indian cities.