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Correction of Water Vapor Absorption for Aerosol Remote Sensing with Ceilometers : Volume 8, Issue 6 (25/06/2015)

By Wiegner, M.

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Book Id: WPLBN0004000511
Format Type: PDF Article :
File Size: Pages 44
Reproduction Date: 2015

Title: Correction of Water Vapor Absorption for Aerosol Remote Sensing with Ceilometers : Volume 8, Issue 6 (25/06/2015)  
Author: Wiegner, M.
Volume: Vol. 8, Issue 6
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Wiegner, M., & Gasteiger, J. (2015). Correction of Water Vapor Absorption for Aerosol Remote Sensing with Ceilometers : Volume 8, Issue 6 (25/06/2015). Retrieved from http://www.ebooklibrary.org/


Description
Description: Ludwig-Maximilians-Universität (LMU), Meteorologisches Institut, Theresienstraße 37, 80333 München, Germany. In recent years attention was increasingly paid to backscatter profiles of ceilometers as a new source of aerosol information. Several case studies have shown that – although originally intended for cloud detection only – ceilometers can provide the planetary boundary layer height and even quantitative information such as the aerosol backscatter coefficient Βp, provided that the signals have been calibrated. It is expected that the retrieval of aerosol parameters will become widespread as the number of ceilometers is steadily increasing, and continuous and unattended operation is provided. In this context however one should be aware of the fact that the majority of ceilometers emit wavelengths that are influenced by atmospheric water vapor. As a consequence, profiles of aerosol parameters can only be retrieved if water vapor absorption is taken into account. In this paper we describe the influence of water vapor absorption on ceilometer signals at wavelengths in the range around Λ = 910 nm. Spectrally high resolved absorption coefficients are calculated from HITRAN on the basis of realistic emission spectra of ceilometers. These results are used as reference to develop a methodology (WAPL) for routine and near real time corrections of the water vapor influence. Comparison of WAPL with the reference demonstrates its very high accuracy. Extensive studies with simulations based on measurements reveal that the error when water vapor absorption is ignored in the Βp retrieval can be in the order of 20 % for mid-latitudes and more than 50 % for the tropics. It is concluded that the emission spectrum of the laser source should be provided by the manufacturer to increase the accuracy of WAPL, and that 910 nm is better suited than 905 nm. With WAPL systematic errors can be avoided, that would exceed the inherent random errors of the Klett solutions by far.

Summary
Correction of water vapor absorption for aerosol remote sensing with ceilometers

Excerpt
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