Heidelberg 2015 – scientific programme
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UP: Fachverband Umweltphysik
UP 4: Postersession Atmosphäre
UP 4.7: Poster
Wednesday, March 25, 2015, 10:45–19:45, G/Foyer
Simultaneous balloon-borne measurements of the key inorganic bromine species BrO and BrONO2 in the stratosphere: (DOAS evaluation) — •S. Kazarski1,3, G. Maucher1, A. Ebersoldt2, A. Butz1, H. Oelhaf1, F. Friedl-Vallon1, H. Nordmeyer1, M. Hoepfner1, S. Schmitt3, L. Scalone3, K. Grossmann3, T. Hueneke3, K. Pfeilsticker3, and J. Orphal1 — 1IMK, Karlsruhe Institute of Technology, Karlsruhe, Germany — 2IPE, Karlsruhe Institute of Technology, Karlsruhe, Germany — 3IUP, University of Heidelberg, Heidelberg, Germany
Inorganic bromine contributes to a loss of stratospheric ozone of about 25 - 30%. Past studies have demonstrated several uncertainties in the photochemistry of stratospheric bromine, especially by considering the three body reaction (kBrONO2) BrO + NO2 + M→ BrONO2 + M, and the photolysis frequencies of BrONO2 (jBrONO2). Hence, an improved knowledge of the ratio jBrONO2/kBrONO2 is crucial to better assess the bromine-related loss of ozone as well as the total amount of bromine in the stratosphere. Here, we report on the first simultaneous balloon-borne measurements of NO2, BrO, and BrONO2 in the stratosphere, performed over Timmins (Ontario)/Northern Canada on Sept., 7th and 8th, 2014. During the flight the targeted species NO2 and BrO were monitored by remote sensing in the UV and visible spectral ranges by Differential Optical Absorption Spectroscopy (DOAS). The analysis and interpretation of the measurements involves radiative transfer as well as photochemical modelling. Major features of the applied techniques are reported and first results are discussed.