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Spectroscopic Requirements of CH4 for MERLIN - a Challenge

Birk, Manfred and Wagner, Georg and Rotger, Maud and Ghysels, Melanie and Tran, Ha and Delahaye, Thibault and Hodges, J.T. and Ree, Zachary (2019) Spectroscopic Requirements of CH4 for MERLIN - a Challenge. AGU Fall Meeting 2019, 9.-13. Dez. 2019, San Francisco, USA.

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Official URL: https://www.agu.org/fall-meeting


The planned space-borne differential LIDAR instrument MERLIN uses two spectral points in the 1.64 um wavelength region to derive weighted CH4 columns. The differential spectroscopic error, i.e. column change by spectroscopic error due to different atmospheric profiles or different ground altitudes below 2 km, should be below 0.623 ppb (0.033%). Within the German-funded SMERLIN project, retrieval simulations are carried out to specify the error requirements for individual line parameters and for systematic error sources in the laboratory measurement and analysis. Cavity ring-down spectroscopy (CRDS) measurements of CH4 carried out at NIST are utilized to derive requirements. The HITRAN spectroscopic database would be too far from reality to be used for this task, especially since important line parameters as speed dependence and line mixing are missing. Excellent laboratory measurements are advantageous for deriving requirements especially since realistic fit residuals are available. It will be shown that the non-noise fit residuals of the multispectrum fitting of the laboratory spectra, even when they are below the 0.1% level, are the largest error source and that broadening of CH4 by H2O must be considered. The current status of the spectroscopic database on CH4 will be reviewed and the requirements for future measurements shown. Furthermore, the modification needs for the level 2 processor to fulfill requirements based on the findings of the retrieval study will be discussed.

Item URL in elib:https://elib.dlr.de/128812/
Document Type:Conference or Workshop Item (Speech)
Title:Spectroscopic Requirements of CH4 for MERLIN - a Challenge
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Rotger, MaudUniversite de Reims Champagne Ardenne, ReimsUNSPECIFIED
Ghysels, MelanieUniversite de Reims Champagne Ardenne, ReimsUNSPECIFIED
Tran, HaUniversite Paris Est-Creteil, ParisUNSPECIFIED
Delahaye, ThibaultLMD, Palaiseau, FrankreichUNSPECIFIED
Hodges, J.T.National Institute of Standards and Technology, Gaithersburg MD 20899 USAUNSPECIFIED
Ree, ZacharyNational Institute of Standards and Technology, Gaithersburg MD 20899 USAUNSPECIFIED
Date:December 2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:spectroscopic-database, accuracy, requirements, Methane, atmosphere
Event Title:AGU Fall Meeting 2019
Event Location:San Francisco, USA
Event Type:international Conference
Event Dates:9.-13. Dez. 2019
Organizer:American Geophysical Union
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):Vorhaben Spectroscopic Methods in Remote Sensing (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Experimental Methods
Deposited By: Birk, Manfred
Deposited On:22 Aug 2019 13:17
Last Modified:09 Dec 2019 12:38

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