Long-Term Measurements of NO2 at Lauder, New Zealand (original) (raw)

Abstract

Daily NO2 column measurements have been made at Lauder, New Zealand (45S, 170E) since 1980. The measurement technique utilizes the highly structured absorptions by NO2 which are present in sunlight scattered from the zenith sky at twilight (dawn and dusk). The site is well suited to stratospheric observations because of the very clear troposphere and negligible amounts of NO2 in the boundary layer. The importance of nitrogen oxides, in particular the so called NOx species (NO and NO2), in determining stratospheric ozone concentrations has long been recognized. The NOx species catalytically destroy ozone but in the anthropogenically perturbed lower stratosphere, they can inhibit ozone depletion by converting active halogen and hydrogen compounds into their unreactive reservoirs (e.g. ClONO2 and HNO3). The dominant variation in the measured NO2 values at Lauder is the photochemically induced diurnal and annual cycles, with the El Chichon and Pinatubo volcanic eruptions producing signi...

Richard McKenzie hasn't uploaded this paper.

Let Richard know you want this paper to be uploaded.

Ask for this paper to be uploaded.