摘要
An examination of the seasonal and spatial distribution of PSCs （polar stratospheric clouds） inferred from standard temperature profiles in the lower-middle atmosphere above Antarctica, as derived from the EOS （earth observing system） Aura MLS （microwave limb sounder） satellite observations and NCEP/NCAR （National Centers for Environmental Prediction/National Center for Atmospheric Research） assimilations, is provided. Chemical VMR （volume mixing ratio） observations of EOS Aura MLS v2.2 HCI （hydrogen chloride） were used to show the interannual variability of PSC formation with respect to stratospheric chlorine partitioning in 2006. A remarkable first set of results, obtained from an algorithm developed for modelling HCI depletion areas in the Antarctic polar vortex region, and based on satellite observations, is presented. In particular, the analysis of HCI concentration data obtained from 2006 indicated that the area processed for HCI was larger than the area of PSC during some periods of Antarctic winter, and that this result was robust with respect to the various PSC formation and HC1 depletion thresholds utilized. The results suggest that an underestimation in chlorine activation area can occur when temperature thresholds for PSC formation thresholds are employed.
