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UP: Fachverband Umweltphysik
UP 11: Atmosphäre und Aerosole: Datenauswertung und Modellierung
UP 11.3: Vortrag
Donnerstag, 13. März 2008, 11:30–11:45, 3B
Time-Resolved Profiling of Stratospheric Radical Species by Balloon-Borne Skylight Limb Observations — •Lena Kritten1, Andre Butz1, Marcel Dorf2, Katja Grunow3, Herman Oelhaf4, Benjamin Simmes2, Frank Weidner2, Gerald Wetzel4, and Klaus Pfeilsticker2 — 1SRON, Utrecht, Netherlands — 2Institut für Umweltphysik, Universität Heidelberg, Heidelberg, Germany — 3Meteorologisches Institut der Freien Universität Berlin, Berlin, Germany — 4Institut für Meteorologie und Klima (IMK), Forschungszentrum Karlsruhe, Karlsruhe, Germany
A balloon-borne spectrometer performing skylight observations in limb geometry was deployed for the first time at low latitudes in north-eastern Brazil in June 2005. Absorption spectra of UV/vis absorbing trace gases were measured from different balloon platforms (LPMA/DOAS, MIPAS, LPMA/IASI) in the upper troposphere and lower stratosphere. The instrument provides time-resolved profile information of atmospheric trace-gas species such as O3, NO2, HONO, BrO, OClO, IO. The measured spectra are analysed applying the DOAS method. When combined with 3D radiative-transfer modelling and an optimal estimation inversion technique, stratospheric concentration profiles of the targeted trace-gases can be inferred for each limb scan [Weidner et al., 2005]. Comparing these measurements to 1-D photochemical modelling based on initialisation by trace-gas observations of the LPMA/DOAS and MIPAS payloads allows to draw conclusions for the photochemistry of radicals important for the tropical ozone layer.