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MERLIN Level 0-1 Processing and Calibration Concept

Lichtenberg, Günter and Aberle, Bernd and Meringer, Markus and Trautmann, Thomas and Ehret, Gerhard and Wirth, Martin and Amediek, Axel (2018) MERLIN Level 0-1 Processing and Calibration Concept. IWGGMS #14 Toronto 2018, 8-10 May 2018, Toronto, Canada.

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Abstract

After water vapor and carbon dioxide, methane ($CH_4$)is the most abundant greenhouse gas in the Earth atmosphere. The new generation space borne Lidar mission MERLIN (Methane Remote Sensing Lidar Mission) will make very sensitive measurements of the $CH_4$ distribution with unprecedented quality, with an accuracy <2%. After its launch, MERLIN will track down sources and sinks of methane on a global scale. MERLIN is an active space-borne instrument using a IPDA (Integrated Path Differential Absorption) LIDAR that will measure the atmospheric column content of methane. The difference in atmospheric transmission between a laser emission with a wavelength placed around the center of a CH 4 absorption line (λ_on ≈1.6μm) and a reference wavelength, λ_off , slightly shifted from λ on by a few tenths of a nm. The Level 0-1 processing converts the raw signal coming from the satellite (essentially electronic counts as a function of time) to the differential absorption optical depth (DAOD). The main steps in the Level 0-1 processing are - the removal of instrument effects and the calculation of the noise - the calculation of the backscatter signal - the calculation of the range - the calculation of the DAOD Additionally, quality parameters for the measurements and cloud flags will be retrieved. Technically, the processor is based on the ramework provided by GCAPS (Generic Calibration and Processing system), which is developed at DLR-IMF. We will give an overview of the processing steps, the mission requirements and the first design of the processor.

Item URL in elib:https://elib.dlr.de/119862/
Document Type:Conference or Workshop Item (Poster)
Title:MERLIN Level 0-1 Processing and Calibration Concept
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lichtenberg, GünterGuenter.Lichtenberg (at) dlr.dehttps://orcid.org/0000-0002-3335-2008
Aberle, BerndBernd.Aberle (at) dlr.deUNSPECIFIED
Meringer, MarkusMarkus.Meringer (at) dlr.dehttps://orcid.org/0000-0001-8526-2429
Trautmann, ThomasThomas.Trautmann (at) dlr.deUNSPECIFIED
Ehret, GerhardDLR, IPAUNSPECIFIED
Wirth, MartinDLR, IPAUNSPECIFIED
Amediek, AxelDLR, IPAhttps://orcid.org/0000-0002-5076-1559
Date:May 2018
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Atmosphere LIDAR Greenhouse Gases Calibration
Event Title:IWGGMS #14 Toronto 2018
Event Location:Toronto, Canada
Event Type:international Conference
Event Dates:8-10 May 2018
Organizer:University of Toronto
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 Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Institute of Atmospheric Physics > Lidar
Deposited By: Lichtenberg, Günter
Deposited On:22 May 2018 07:18
Last Modified:31 Jul 2019 20:17

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