Berlin 2005 – wissenschaftliches Programm
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UP: Umweltphysik
UP 6: Poster: Aerosole
UP 6.1: Poster
Dienstag, 8. März 2005, 10:15–12:15, Poster TU HTF
SAGE AEROSOL EXTINCTION MEASUREMENTS IN THE ARCTIC UPPER TROPOSPHERE/LOWER STRATOSPHERE — •Renate Treffeisen1, Andreas Herber2, and Larry Thomason3 — 1Alfred Wegener Institute for Polar and Marine Research, Am Telegrafenberg A45, 14473 Potsdam, Germany — 2Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany — 3NASA Langley Research Center Hampton, VA, USA
The Stratospheric Aerosol and Gas Experiment (SAGE) II has collected vertical profiles of aerosol extinction in the Arctic at four wavelengths (385 to 1020 nm) from its launch in 1984 aboard the Earth Radiation Budget Satellite to the present. SAGE III, launched in late 2001, measures aerosol extinction at nine wavelengths from 385 nm to 1540 nm. While these instruments are nominally designed to measure stratospheric aerosol, they had produced a considerable amount of aerosol extinction observations in the Arctic middle and upper troposphere particularly at the longer wavelength channels.
In this presentation, we will demonstrate the robustness of the measurements. Since SAGE uses the solar occultation technique, the integration path through the atmosphere is long, and inhomogeneity along the path particularly within the troposphere and in the presence of clouds is a significant limitation to the use of this data. The study shows that the presence of clouds can be detected and adequately excluded from the data analysis.