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Atmospheric Aerosol Characterization with a Ground-based Spex Spectropolarimetric Instrument : Volume 7, Issue 12 (10/12/2014)

By Van Harten, G.

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Book Id: WPLBN0003999561
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: Atmospheric Aerosol Characterization with a Ground-based Spex Spectropolarimetric Instrument : Volume 7, Issue 12 (10/12/2014)  
Author: Van Harten, G.
Volume: Vol. 7, Issue 12
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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H. Rietjen, J. H., Noia, A. D., Volten, H., Snik, F., Keller, C. U., Harten, G. V.,...Boer, J. D. (2014). Atmospheric Aerosol Characterization with a Ground-based Spex Spectropolarimetric Instrument : Volume 7, Issue 12 (10/12/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: Leiden Observatory, Leiden University, Leiden, the Netherlands. Characterization of atmospheric aerosols is important for understanding their impact on health and climate. A wealth of aerosol parameters can be retrieved from multi-angle, multi-wavelength radiance and polarization measurements of the clear sky. We developed a ground-based SPEX instrument (groundSPEX) for accurate spectropolarimetry, based on the passive, robust, athermal, and snapshot spectral polarization modulation technique, and is hence ideal for field deployment. It samples the scattering phase function in the principal plane in an automated fashion, using a motorized pan/tilt unit and automatic exposure time detection. Extensive radiometric and polarimetric calibrations were performed, yielding values for both random noise and systematic uncertainties. The absolute polarimetric accuracy at low degrees of polarization is established to be ~5 × 10−3. About 70 measurement sequences have been performed throughout four clear-sky days at Cabauw, the Netherlands. Several aerosol parameters were retrieved: aerosol optical thickness, effective radius, and complex refractive index for fine and coarse mode. The results are in good agreement with the colocated AERONET products, with a correlation coefficient of Ρ = 0.932 for the total aerosol optical thickness at 550 nm.

Summary
Atmospheric aerosol characterization with a ground-based SPEX spectropolarimetric instrument

Excerpt
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