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Tropospheric Aerosol Scattering and Absorption Over Central Europe: a Closure Study for the Dry Particle State : Volume 13, Issue 10 (28/10/2013)

By Ma, N.

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Book Id: WPLBN0003996464
Format Type: PDF Article :
File Size: Pages 44
Reproduction Date: 2015

Title: Tropospheric Aerosol Scattering and Absorption Over Central Europe: a Closure Study for the Dry Particle State : Volume 13, Issue 10 (28/10/2013)  
Author: Ma, N.
Volume: Vol. 13, Issue 10
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Müller, T., Tuch, T., Xu, W. Y., Birmili, W., Cheng, Y. F., Zhao, C. S.,...Wiedensohler, A. (2013). Tropospheric Aerosol Scattering and Absorption Over Central Europe: a Closure Study for the Dry Particle State : Volume 13, Issue 10 (28/10/2013). Retrieved from

Description: Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany. This work analyses optical properties of the dry tropospheric aerosol measured at the regional GAW observation site Melpitz in East Germany. For a continuous observation period between 2007 and 2010, we provide representative values of the dry-state scattering coefficient, the hemispheric backscattering coefficient, the absorption coefficient, single scattering albedo, and the Ångström exponent. Besides the direct measurement, the aerosol scattering coefficient was alternatively computed from experimental particle number size distributions using a Mie code. Within pre-defined limits, a closure could be achieved with the direct measurement. The achievement of closure implies that such calculations can be used as a high-level quality control measure for data sets involving multiple instrumentation.

All dry optical properties showed significant annual variations, which were attributed to corresponding variations in the regional emission fluxes, the intensity of secondary particle formation, and the mixed layer height. Air mass classification showed that atmospheric stability is a major factor influencing the dry aerosol properties at the GAW station. In the cold season, temperature inversions limit the volume available for atmospheric mixing, so that the aerosol optical properties near the ground proved quite sensitive to the geographical origin of the air mass. In the warm season, when the atmosphere is usually well-mixed during day-time, considerably less variability was observed for the optical properties between different air masses. This work provides, on the basis of quality-checked in-situ measurements, a first step towards a climatological assessment of direct aerosol radiative forcing in the region under study.

Tropospheric aerosol scattering and absorption over Central Europe: a closure study for the dry particle state

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