SCIAMACHY VALIDATION USING GROUND-BASED DOAS MEASUREMENTS OF THE UNIVERSITY OF BREMEN BREDOM NETWORK

• Main Authors: A. Richter, D. Adukpo, S. Fietkau, A. Heckel, A. Ladstätter-weißenmayer, A. Löwe, T. Medeke, H. Oetjen, F. Wittrock, J. P. Burrows
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Arctic
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.212.1061; http://envisat.esa.int/pub/ESA_DOC/envisat_val_1202/proceedings/ACV/ground_based/18_AOID331_DOAS.pdf

A network of ground-based UV/visible DOAS instruments operated by the University of Bremen is used to validate total column measurements from the SCIAMACHY instrument on ENVISAT from the tropics to the Arctic. Measurement quantities include vertical columns of O3, NO2, and BrO. Depending on atmospheric conditions, also slant columns of OClO (during chlorine activation) and SO2, HCHO or IO can be measured. In addition to the standard zenith-sky measurement, all instruments perform off-axis horizon measurements that provide information on the tropospheric burden of the observed species. This quantity will also be used for validation once tropospheric products become available from SCIAMACHY. In this paper, the instruments and their operation is briefly described as well as the analysis procedures used. Preliminary validation results using SCIAMACHY ozone columns from the Meteo product and NO2 columns from a DOAS analysis performed on SCIAMACHY lv1 data at the University of Bremen are also presented. Although still little data is available at the time of writing, the first comparisons show the high potential of the SCIAMACHY measurements. 1. THE BREDOM NETWORK The BREDOM is a network of high quality UV/visible spectrometers for atmospheric observation that is currently set up by the University of Bremen, Germany. The aim is to provide long-term, continuous measurements of a number of stratospheric and tropospheric species at latitudes ranging from the Arctic to the equator. The instruments used for the network are NDSC-qualified [10], and close co-operation exists with the NDSC and other DOAS networks (from the University of Heidelberg, IASB, NIWA) and the SAOZ network of the CNRS, adding to the global atmosphere observation system.