Regensburg 2007 – scientific programme
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UP: Fachverband Umweltphysik
UP 17: Satellitengestützte Messmethoden
UP 17.2: Talk
Wednesday, March 28, 2007, 14:00–14:15, H48
Stratospheric Trace Gases from SCIAMACHY Limb Measurements Using 3D Full Spherical Monte Carlo Radiative Transfer Model Tracy-II — •Janis Pukite1,3, Sven Kühl1, Tim Deutschmann2, Ulrich Platt2, and Thomas Wagner1 — 1Max-Planck-Institut für Chemie, Mainz, Germany — 2Institut für Umweltphysik, University of Heidelberg, Germany — 3Institute of Atomic Physics and Spectroscopy, University of Latvia, Latvia
A two step method for the retrieval of stratospheric trace gases (NO2, BrO, OClO) from SCIAMACHY limb observations in the UV/VIS spectral region is presented: First, DOAS is applied on the spectra, yielding slant column densities (SCDs) of the respective trace gases. Second, the SCDs are converted into vertical concentration profiles applying radiative transfer modeling.
The Monte Carlo method benefits from conceptual simplicity and allows realizing the concept of full spherical geometry of the atmosphere and also its 3D properties, which are important for a realistic description of the limb geometry. The implementation of a 3D box air mass factor concept allows accounting for horizontal gradients of trace gases.
An important point is the effect of horizontal gradients on the profile inversion. This is of special interest in Polar Regions, where the Sun elevation is typically low and photochemistry can highly vary along the long absorption paths. We investigate the influence of horizontal gradients by applying 3-dimensional radiative transfer modelling.