Abstract Analysis of the meteor radar wind observations in the upper mesosphere and lower thermosphere (UMLT) region (82–98 km) over Rothera (67.5°S, 68.1°W) reveals that the monthly mean zonal winds show a large interannual variability during November-December, when compared to other months. Large westward winds are observed during November-December of the years 2006–2011, 2015, 2018 and 2020, when the amount of ozone loss is more in the southern high-latitude stratosphere (57.5°S–77.5°S). The ERA-5 reanalysis winds at 30 hPa over 67.5°S also show an interannual variability with large eastward winds at stratospheric heights during October-November of those years. The presence of high meridional heat flux due primarily to the planetary wave (PW) of zonal wavenumber 1 in the other years increases the polar stratospheric temperature and subsequently reduces the catalytic destruction of ozone by preventing the formation of polar stratospheric clouds (PSCs). Further, it is also found that the ozone loss influences the migrating semi-diurnal (SW2) tidal variabilities at upper mesospheric heights with low activity corresponding to the years having more ozone loss. These results indicate the impact of planetary waves on the catalytic destruction of Antarctic ozone leading to the circulation and tidal amplitude changes extending up to the UMLT region.
Impact of stratospheric planetary wave and ozone variabilities on the austral polar middle atmospheric circulation
Advances in Space Research ; 69 , 8 ; 2976-2988
2022-01-21
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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