Airborne measurements during the Arctic Stratospheric Experiment: Observation of O3 and NO2

Abstract

During winter 1991/92 DOAS (Differential Optical Absorption Spectroscopy) measurements were performed from a C130 Transall aircraft within the framework of the EASOE (European Arctic Stratospheric Ozone Experiment) campaign. The campaign extended from Dec. 1991 until March 1992 with a series of flights in the Arctic (60°W to 60°E, 85°N to 48°N). Two spectrometers were operated on the aircraft: an UV‐instrument (see Brandtjen et al., this issue) and a DOAS‐vis instrument to detect O3, O4, NO2 and NO3 in the visible band (363 nm–680 nm). The DOAS‐vis ozone measurements were largely influenced by the presence of the Mt Pinatubo aerosol cloud. A correction of the data by actual Mie‐profiles is described. A NO2 depletion with minimum values of 2.3*1014/cm² in Jan. 92 was observed. Occasionally, OClO could also be detected. Copyright 1994 by the American Geophysical Union.