COMPARISON OF MODELLED AND MEASURED CHLORINE DIOXIDE SLANT COLUMNS FOR THE ARCTIC WINTER 2004/2005

• Main Authors: H Oetjen, H Bovensmann, T Medeke, A Richter, N Sheode, B.-M Sinnhuber, F Wittrock, J P Burrows
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Arctic; Ny-Ålesund; Ny Ålesund
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1060.5682; http://www.sciamachy.org/validation/documentation/proceedings_ACVE-3/oetjen.pdf

ABSTRACT In this paper, OClO measurements from SCIAMACHY are presented and validated with ground-based DOAS observations. In addition, the different measurements are compared to model calculations including the photochemical change along the light path to investigate the degree of overall consistency. Although OClO does not participate directly in the destruction of Ozone, its accurate measurement as well as modelling is crucial to understand the highly perturbed chlorine chemistry in the polar vortices. SCIAMACHY OClO slant columns for the spring 2005 have been validated by comparison with measurements in Ny-Ålesund (79°N, 12°E), Summit (73°N, 38°W), and Bremen (53°N, 9°E). Also, modelled OClO slant column densities, synchronised to the solar zenith angle of the measurements are included in this comparison. Overall, a good agreement is found between the SCIAMACHY and the ground-based measurements. However, the model predictions significantly disagree with the measurements by under-estimating the OClO for periods with strong chlorine activation.