Case study of deep STE event of ozone at a low latitude Indian station using simultaneous balloon borne ozonesonde and surface ozone measurements

{kksHkeaMy esa vkst+ksu dh ek=k dks izHkkfor djus okys egRoiw.kZ dkjd vkst+ksu dk lerkieaMy {kksHkeaMy esa ijLij fofue; ¼STE½ dk gksuk gSA ;g loZekU; ckr gS fd fuEu v{kka’kksa ij lerkieaMy {kksHkeaMy fofue; ¼STE½ vis{kkd`r vlkekU; gksrk gSA blfy, bl 'kks/k i= esa vkstksu lkSans] mixzg ,oa ijkcSaxuh izdk’kfed vkst+ksu fo’ys"kd vkadM+ksa dk mi;ksx djrs gq, Hkkjr ds fuEu v{kka’k ij fLFkr Å".k dfVca/kh; vkst+ksu ds lerkieaMy {kksHkeaMy fofue; ¼STE½ dh ?kVuk dk xgjkbZ ls v/;;u fd;k x;k gSA Stratosphere Troposphere Exchange (STE) of ozone is an important factor influencing the budget of ozone in the troposphere. It is well established that STE is relatively uncommon at low latitudes. Therefore a case study of deep STE event of ozone at a low latitude tropical coastal site of India is presented in the paper using ozonesonde, satellite and UV photometric ozone analyzer data.

Study of SO2 and NO2 behaviour during the ozone-hole event at Antarctica by Brewer Spectrophotometer

Vertical column density of sulphur dioxide has been measured at Maitri (70.7°S, 11.7°E), the Indian station in the Antarctica from September, 1999 to December, 2006 by a Brewer Spectrophotometer. Simultaneously, nitrogen dioxide, ozone and the maximum value of UV-B have also been measured, we found an increase in SO2 during spring. An increase in NO2 column was also found during this period but not identical with that of SO2. These variations in SO2 and NO2 are not in phase with the increase in UV-B flux at the ground due to the decrease of ozone column in the stratosphere. The variation of SO2 column is explained by the downward shift of penetration depth of UV-B radiation during the ozone-hole event.