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Voigt profile introduces optical depth dependent systematic errors – detected in high resolution laboratory spectra of water

Birk, Manfred and Wagner, Georg (2016) Voigt profile introduces optical depth dependent systematic errors – detected in high resolution laboratory spectra of water. Journal of Quantitative Spectroscopy and Radiative Transfer, 170, pp. 159-168. Elsevier. DOI: 10.1016/j.jqsrt.2015.11.008 ISSN 0022-4073

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Official URL: http://www.sciencedirect.com/science/journal/00224073

Abstract

The Voigt profile commonly used in radiative transfer modeling of Earth’s and planets’ atmospheres for remote sensing/climate modeling produces systematic errors so far not accounted for. Saturated lines are systematically too narrow when calculated from pressure broadening parameters based on the analysis of laboratory data with the Voigt profile. This is caused by line narrowing effects leading to systematically too small fitted broadening parameters when applying the Voigt profile. These effective values are still valid to model non-saturated lines with sufficient accuracy. Saturated lines dominated by the wings of the line profile are sufficiently accurately modeled with a Voigt profile with the correct broadening parameters and are thus systematically too narrow when calculated with the effective values. The systematic error was quantified by mid infrared laboratory spectroscopy of the water 2 fundamental. Correct Voigt profile based pressure broadening parameters for saturated lines were 3-4% larger than the effective ones in the spectroscopic database. Impacts on remote sensing and climate modeling are expected. Combination of saturated and non-saturated lines in the spectroscopic analysis will quantify line narrowing with unprecedented precision.

Item URL in elib:https://elib.dlr.de/99869/
Document Type:Article
Title:Voigt profile introduces optical depth dependent systematic errors – detected in high resolution laboratory spectra of water
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Birk, ManfredUNSPECIFIEDUNSPECIFIED
Wagner, GeorgUNSPECIFIEDUNSPECIFIED
Date:2016
Journal or Publication Title:Journal of Quantitative Spectroscopy and Radiative Transfer
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:170
DOI :10.1016/j.jqsrt.2015.11.008
Page Range:pp. 159-168
Editors:
EditorsEmail
Bernath, PeterOld Dominion University, Norfolk, Virginia, USA
Mengüç, M. PinarÖzyeğin University, Istanbul, Turkey
Mishchenko, Michael I.NASA-Goddard Institute for Space Studies, New York, USA
Publisher:Elsevier
ISSN:0022-4073
Status:Published
Keywords:Voigt line profile, speed-dependent Voigt line profile, radiative transfer, optical depth, systematic errors
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Experimental Methods
Deposited By: Birk, Manfred
Deposited On:24 Nov 2015 16:09
Last Modified:06 Sep 2019 15:28

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