Simulation of the Influence of Ion-Produced NO_X and HO_X Radicals on the Antarctic Ozone Depletion with a One-Dimensional Model

A one -dimensional time-dependent photochemical model is used to simulate the influence of ion-produced NOx and HOx radicals on the Antarctic ozone depletion in polar night and polar spring at a latitude of 73 degrees south.Vertical transport and nitrogen-oxygen (NOx). hydrogen-oxygen (HOx) production by ionic reactions have been introduced into the model.NOx and HOx produced by precipitating ions are transported into the lower stratosphere by vertical motion and have some effects in the development of the Antarctic ozone depletion.From winter through spring the calculated ozone column decreases to 269.4 DU. However, this value is significantly higher than the total ozone observed at several Antarctic ozone stations.

Three-Year Observations of Ozone Columns over Polar Vortex Edge Area above West Antarctica

Ozone vertical column densities(VCDs)were retrieved by Zenith Scattered Light-Differential Optical Absorption Spectroscopy(ZSL-DOAS)from January 2017 to February 2020 over Fildes Peninsula,West Antarctica(62.22°S,58.96°W).Each year,ozone VCDs started to decline around July with a comparable gradient around 1.4 Dobson Units(DU)per day,then dropped to their lowest levels in September and October,when ozone holes appeared(less than 220 DU).Daily mean values of retrieved ozone VCDs were compared with Ozone Monitoring Instrument(OMI)and Global Ozone Monitoring Experiment 2(GOME-2)satellite observations and the Modern-Era Retrospective analysis for Research and Applications Version 2(MERRA-2)reanalysis dataset,with correlation coefficients(R2)of 0.86,0.94,and 0.90,respectively.To better understand the causes of ozone depletion,the retrieved ozone VCDs,temperature,and potential vorticity(PV)at certain altitudes were analyzed.The profiles of ozone and PV were positively correlated during their fluctuations,which indicates that the polar vortex has a strong influence on stratospheric ozone depletion during Antarctic spring.Located at the edge of polar vortex,the observed data will provide a basis for further analysis and prediction of the inter-annual variations of stratospheric ozone in the future.

Continuous Ozone Depletion over Antarctica After 2000 and Its Relationship with the Polar Vortex

Observations have shown highly variable ozone depletion over the Antarctic in the 2000s, which could affect the long-term ozone trend in this region as well as the global ozone recovery. By using the total column ozone data （1979-2011）, interannual variation of the springtime Antarctic ozone tow is investigated, together with its relationship with the polar vortex evolution in the lower stratosphere. The results show that springtime Antarctic ozone depletion has continued in the 2000s, seemingly contradicting the consensus view of a global ozone recovery expected at the beginning of the 21st century. The spring Antarctic polar vortex in the lower stratosphere is much stronger in the 2000s than before, with a larger area, delayed breakup time, and greater longevity during 2000-2011. Fhrther analyses show that the recent continuation of springtime Antarctic ozone depletion could be largely attributed to the abnormal variation of the Antarctic polar vortex.