Dresden 2020 – scientific programme

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UP: Fachverband Umweltphysik

UP 9: Aerosols

UP 9.3: Talk

Thursday, March 19, 2020, 14:40–15:00, HSZ 105

Stratospheric aerosol particle size retrievals based on SAGE III/ISS — •Felix Wrana, Christian von Savigny, and Jacob Zalach — Universität Greifswald

Because of its role in the radiative balance of the atmosphere and in atmospheric chemistry interest in the particle size distribution (PSD) of stratospheric aerosol is growing in recent years. Here, the use of remote sensing using satellite measurements yields the benefit of a much greater spatial coverage in aerosol data, than ground based or in-situ measurements can provide. In this work the solar occultation data set of the SAGE III instrument mounted on the ISS, which is active since summer 2017, was used to derive the PSD parameters for stratospheric aerosol. For this, color ratios of extinction measurements at three different wavelengths were used to retrieve median radii and mode widths. While in the past it was often necessary to assume one parameter to determine the other, the broad wavelength spectrum of SAGE III allows the simultaneous retrieval of both parameters, which was done here. Number densities and effective radii were also calculated. While the median radii and mode widths interestingly show reverse trends with increasing height, the results seem to be in general agreement with other comparable works.