Climatology and trend analysis of global Total Columnar Ozone using OMI satellite data during 2004 -2017

摘要

The depletion of ozone layer in the stratosphere changes the Earth's radiation budget and also causes human health effects. The ozone layer variation trend varies from location to location and drastic changes were found from equator to pole. In order to study the trend in the ozone layer OMI satellite L3 data on board Aqua has been utilized from 2004 to 2017 with 1° X 1° resolution data. The result shows the positive trend of 0.384 DU/year over the globe, whereas the Northern and Southern hemispheres are 0 499 DU/year, 0.383 DU/year. A highest positive recovery of 0.957 DU/year has been noticed over Antarctica region and an almost constant trend of 0.071 DU/year over Australia. A positive trend of 0.830 DU/year, 0.681 DU/year, 0.342 DU/year, 0.340 DU/year and 0.374 DU/year are noticed over North America, Asia, Europe, Africa and South America. Total Columnar Ozone (TCO) is high in the North Africa region. Highest depletion of ozone layer is found in 2007, 2012 and 2016 over Antarctica region and its depletion start at the end of the winter season. Nearly 300 DU TCO exists up to mid latitude and above 300 DU are in the high latitudes of Asia. Global mean value for the study period is 289.5 DU. The climatological values are 266 8 DU, 259.4 DU, 319.7 DU, 270 DU, 325 DU, 333.4 DU, 261.7 DU over Africa, Antarctica, Asia, Australia, Europe, North America and South America respectively. The climatological mean value over Northern hemisphere and Southern hemisphere are 294.4 DU and 275 DU respectively and the trends are 0 499, 0 383 respectively. Highest depletion of TCO is noticed in 2006 and 2015 early spring time over Antarctica.