In-Situ BrO Measurements in the Upper Troposphere / Lower Stratosphere: Validation of the ENVISAT Satellite Measurements and Photochemical Model Studies
Inorganic bromine species form the second most important halogen family affecting stratospheric ozone (WMO, 2003). Although the stratospheric bromine mixing ratio is about two orders of magnitude lower than the chlorine one, bromine has much higher ozone depleting potential (factor of about 45) comp...
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| Format: | Doctoral or Postdoctoral Thesis |
| Language: | English |
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Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
2007
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| Online Access: | https://juser.fz-juelich.de/record/58900 https://juser.fz-juelich.de/search?p=id:%22PreJuSER-58900%22 |
| Summary: | Inorganic bromine species form the second most important halogen family affecting stratospheric ozone (WMO, 2003). Although the stratospheric bromine mixing ratio is about two orders of magnitude lower than the chlorine one, bromine has much higher ozone depleting potential (factor of about 45) compared to chlorine. This study reports and discusses atmospheric bromine monoxide, BrO, measurements in the altitude range 15-30 km performed by the balloon-borne instrument TRIPLE and aircraft instrument HALOX employing the chemical conversion resonance fluorescence technique, which is the only proven in-situ technique for the measurements of BrO. 57 HALOX flights have been performed in the frame of five field campaigns ranging from the Arctic to tropics. Three TRIPLE flights were carried out at high and mid latitudes in the frame of the SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) validation. Calibration, consistency checks, data analysis, and error assessment for the in-situ measurements are described. The balloon measurements have yielded vertical profiles of BrO between 15 and 30 km altitude at northern mid- and at arctic latitudes. From the aircraft measurements a meridional BrO distribution from tropical to the arctic latitudes between 15 and 20 km altitude was obtained. For the SCIAMACHY validation the TRIPLE BrO profiles have been photochemically corrected by means of the Jülich CLaMS (Chemical Lagrangian Model of the Stratosphere) model in order to reflect the diurnal variation of BrO and adjust the profiles to the photochemical conditions of the corresponding SCIAMACHY measurements. Hereby appropriate SCIAMACHY profiles have been found to be systematically higher than the TRIPLE profiles but mostly within the bounds of the accuracies of both techniques. Improvements in the satelite retrieval procedures are ongoing. [.] |
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