We investigated the characteristics of the total ozone column (TOC) around West Antarctica (near the Weddell Sea) compared with ambient meteorological factors. For this analysis, we used ground-based and satellite TOC measurements as well as meteorology (air temperature, potential vorticity and wind field) from reanalysis data. Long-term patterns of TOC show the large year-to-year variation (e.g., maximumly ∼200 DU at King Sejong) but a steady recovering trend recently. Despite a generally consistent pattern, the TOC around West Antarctica did not correlate well between high- and low-latitude regions during austral spring; this result implies that the ozone hole area had a spatial variation over West Antarctica. The TOC pattern around West Antarctica correlated well with air temperature but showed a vertical difference; high positive correlations appeared in the lower stratosphere (maximumly R > 0.9 at ∼50–100 hPa height) showing enhanced ozone depletion in colder conditions, but negative correlations appeared in the upper stratosphere (minimum R < −0.8 at ∼5–10 hPa height) associated with the temperature dependence of ozone chemistry. The TOC also showed an interesting relationship to the potential vorticity: high positive correlation in the upper stratosphere (maximumly R > 0.9 at ∼500–600 K height) during the austral spring but a moderately negative correlation in the lower stratosphere (minimum R < −0.6 at ∼300–350 K height) during the austral summer. This peculiar pattern probably relates to the polar vortex intensification in the stratosphere and the stratosphere-troposphere airmass exchange near the tropopause. There were also some correlations with wind field (R = ∼0.4–0.6) showing air-mass mixing effects. These findings indicate a large meteorological influence on the spatiotemporal pattern of the TOC in West Antarctica.
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© 2018 Elsevier Ltd
All Science Journal Classification (ASJC) codes
- General Environmental Science
- Atmospheric Science