Int J Cur Res Rev | Vol 10 • Issue 10 • May 2018 53 International Journal of Current Research and Review DOI: 10.31782/IJCRR.2018.10108 Unusual Changes in Stratospheric Ozone and Water Vapor Over Antarctica and its Relation to Mesosphere Dynamics during a Minor Sudden Stratosphere Warming G. Venkata Chalapathi 1 , S. Eswaraiah 2* , P. Vishnu Prasanth 3 , Jaewook Lee 2 , K. Niranjan Kumar 4 , Yong Ha Kim 2 1 Department of Physics, Govt. Degree college, Anantapur-515001, India; 2 Department of Astronomy and Space Science, Chungnam National University, Daejeon- 305-764, Korea; 3 Department of Physics, Sree Vidyanikethan Engineering College, Tirupati- 517102, India; 4 Atmosphere and Ocean Research Institute (AORI), The University of Tokyo, Chiba, 277-8568, Japan. ABSTRACT Objective: Usually, the stratospheric ozone will show its significance in the variability of mesospheric tides in normal days over the low-latitude region. But during sudden stratosphere warmings, the water vapor and ozone over the polar region will change and shows some different effects on mesosphere tides. In the present study, we have provided the unusual changes in both water vapor and ozone over Antarctica and their role in altering the mesospheric tides. Method: Using MLS data in the stratosphere and Rothera (68oS, 68oW) MF radar observations in the mesosphere, the vari- ability of Antarctica ozone and H2O during sudden stratospheric warming (SSW) winter 2010, and their influence on mesosphere dynamics has presented. The unusual increment of ozone reduction is noticed and consequent enhancement in H2O and HNO3 is also observed during the warming period. Mesospheric tidal components (diurnal, semi-diurnal and terr-diurnal) have been estimated using the hourly wind data from the MF radar. Result: The unusual changes in H2O and Ozone were observed during the warming period the similar behavior was observed in semi-diurnal tidal components during 2010 winter and their relation to ozone enhancement is discussed. Conclusion: The observations indicate that the enhancement of H2O and HNO3 leads to produce the ozone during warming period and hence the increment in ozone reduction is achieved over the polar region. Further, the enhancement of Brewer- Dobson mean circulation was clearly noticed through ozone transport during the warming period. The tidal enhancement after the SSW could be due to the non-linear interaction between planetary waves and tides. Key Words: Sudden Stratospheric Warming, Ozone and H2O variability, Mesospheric Tides, MF Radar Corresponding Author: Dr. Sunkara Eswaraiah, Department of Astronomy and Space Science, Chungnam National University, Daejeon, Korea; Ph:+82-10-30690508; E-mail: eswar.mst@gmail.com ISSN: 2231-2196 (Print) ISSN: 0975-5241 (Online) Received: 20.02.2018 Revised: 22.03.2018 Accepted: 25.04.2018 INTRODUCTION It is well known that in the winter polar stratosphere, strat- ospheric sudden warming (SSW) occurs as a result of the interactions between vertically propagating planetary waves and the zonal winds (15). Ozone destruction occurs over both the polar regions in local winter-spring. In the Ant- arctic, essentially complete removal of lower-stratospheric ozone currently results in an ozone hole every year (14). In the winter polar lower stratosphere, low temperatures induce condensation of water vapor (H O) and nitric acid (HNO ) into polar stratospheric clouds (PSCs). Further, it is under- stood that PSCs along with cold aerosols provide surfaces for heterogeneous conversion of chlorine from longer-lived reservoir species, such as chlorine nitrate (ClONO ) and hydrogen chloride (HCl), into reactive (ozone-destroying) forms, with chlorine monoxide (ClO) predominant in day- light (20). In the Antarctic, enhanced ClO is usually present for 4-5 months (through to the end of September) (19), lead- ing to the destruction of most of the ozone in the polar vortex between 14 and 20 km altitude. IJCRR Research Article Section: Life sciences Sci. Journal Impact Factor 4.016 ICV: 71.54