Author(s)

M. Martinez, T. Arnold, T. Klupfel and D. Perner

Abstract

Within the EC-sponsored Arctic Tropospheric Ozone Chemistry (ARCTOC) project low ozone events, LOE, were studied at Ny Alesund, Spitsbergen, in spring. BrO and Og were determined spectroscopically by DO AS. Peroxy radicals, HO2/RO2, and C1/C1O mixing ratios were measured continuously and simultaneously by chemical amplification (ROx box). Under conditions with around 45 ppb ozone the ROx box signalled about 4 ppt of peroxy radicals at the daily noon maximum and zero at night. During low ozone events, LOEs, BrO reached up to 20 ppt. Then the daily maxima of the ROx box signals increased and at night CIO was foun

Keywords