Observations of depleted stratospheric NO2following the Pinatubo volcanic eruption

摘要: Following the eruption of Mount Pinatubo, and subsequent transport volcanic aerosol, significant depletions stratospheric NO2 were observed at Lauder, New Zealand (45°S, 170°E). The effect was more pronounced in columns measured sunrise than those sunset, column amounts reduced by 40% October 1991. Concurrent ozone measurements obtained using same technique compared with Dobson which confirmed that October, apparent reductions only 10–15% can be explained geometric changes scattering caused aerosols. We therefore conclude a real depletion has occurred. levels twilight are dependent on many factors, but these observations may provide supporting evidence for hypothesis heterogeneous processes convert N2O5 to HNO3 sulfate aerosol surfaces [Rodriguez et al, 1991]. If this proves case it could, presence current high chlorine volcanically enhanced densities, lead accelerated global depletion.