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Near infrared nadir retrieval of vertical column densities: methodology and application to SCIAMACHY

Gimeno Garcia, Sebastian and Schreier, Franz and Lichtenberg, Günter and Slijkhuis, Sander (2011) Near infrared nadir retrieval of vertical column densities: methodology and application to SCIAMACHY. Atmospheric Measurement Techniques, 4 (12), pp. 2633-2657. Copernicus Publications. DOI: 10.5194/amt-4-2633-2011.

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Official URL: http://www.atmos-meas-tech.net/4/2633/2011/


Nadir observations with the shortwave infrared channels of SCIAMACHY on-board the ENVISAT satellite can be used to derive information on atmospheric gases such as CO, CH4, N2O, CO2, and H2O. For the operational level 1b-2 processing of SCIAMACHY data, a new retrieval code BIRRA (Beer InfraRed Retrieval Algorithm) has been developed. BIRRA performs a nonlinear or separable least squares fit (with bound constraints optional) of the measured radiance, where molecular concentration vertical profiles are scaled to fit the observed data. Here we present the forward modeling (radiative transfer) and inversion (least squares optimization) fundamentals of the code along with the further processing steps required to generate higher level products such as global distributions and time series. Moreover, various aspects of level 1 (observed spectra) and auxiliary input data relevant for successful retrievals are discussed. BIRRA is currently used for operational analysis of carbon monoxide vertical column densities from SCIAMACHY channel 8 observations, and is being prepared for methane retrievals using channel 6 spectra. A set of representative CO retrievals and first CH4 results are presented to demonstrate BIRRA's capabilities.

Document Type:Article
Title:Near infrared nadir retrieval of vertical column densities: methodology and application to SCIAMACHY
AuthorsInstitution or Email of Authors
Gimeno Garcia, SebastianTU Muenchen
Schreier, Franzfranz.schreier@dlr.de
Lichtenberg, GünterUNSPECIFIED
Slijkhuis, SanderUNSPECIFIED
Date:December 2011
Journal or Publication Title:Atmospheric Measurement Techniques
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 2633-2657
Publisher:Copernicus Publications
Keywords:Atmosphere, Remote Sensing, Radiative Transfer, ENVISAT, Near Infrared
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 Entwicklung von Atmosphärenprozessoren
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Dr.rer.nat. Franz Schreier
Deposited On:15 Dec 2011 08:47
Last Modified:12 Dec 2013 21:14

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