Nadir Sounding of Carbon Gases using SCIAMACHY Near Infrared Channels
Gimeno-Garcia, Sebastian and Schreier, Franz and Lichtenberg, Günter and Slijkhuis, Sander and Hess, Michael and Aberle, Bernd (2010) Nadir Sounding of Carbon Gases using SCIAMACHY Near Infrared Channels. COSPAR Scientific Assembly, 18-25 July 2010, Bremen, Germany.
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The Beer InfraRed Retrieval Algorithm (BIRRA) and Column EstimatoR Vertical InfraRed Sounding Atmosphere (CERVISA) codes have been designed to retrieve vertical column densities (VCDs) of atmospheric gases in the near and thermal infrared (NIR,TIR) region of the electromagnetic spectrum by means of non-linear least squares ﬁtting of radiances. As part of the operational SCIAMACHY level 1-2 processor, BIRRA is currently used for the speciﬁc retrieval of carbon monoxide (CO) VCDs exploiting the ﬁtting window 4282-4301 cm-1 within the SCIAMACHY channel 8. Using appropriate ﬁtting windows in channel 6, BIRRA also allows to gain information on greenhouse gases such as methane and carbon dioxide. Unfortunately, the increasing number of dead and bad pixels - specially in the NIR channels - reduces the available spectral information and consequently makes the VCDs retrieval more and more challenging. The proper choice of the pixel mask, ﬁtting window, auxiliary ﬁt parameters, as well as the ﬁltering of the Level 2 data is crucial for obtaining a high quality atmospheric product. For validation of BIRRA the closely related CERVISA code is used to retrieve CO and CH4 from nadir infrared sounding data of AIRS, IASI, or TES. BIRRA and CERVISA share a large portion of modules, e.g., for line-by-line absorption and the nonlinear least squares solver; the essential diﬀerence is the part of the forward model devoted to radiative transfer through the atmosphere, i.e., Beer’s law for the NIR versus Schwarzschild’s equation for the TIR. CERVISA retrieval results are compared both to the operational products of the TIR sounder and to the SCIAMACHY-BIRRA product. In this work, we present recent results of carbon monoxide and methane retrievals.
|Document Type:||Conference or Workshop Item (Poster)|
|Title:||Nadir Sounding of Carbon Gases using SCIAMACHY Near Infrared Channels|
|Keywords:||Radiative transfer, atmospheric remote sensing, infrared, Envisat|
|Event Title:||COSPAR Scientific Assembly|
|Event Location:||Bremen, Germany|
|Event Type:||international Conference|
|Event Dates:||18-25 July 2010|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||W - Vorhaben Entwicklung von Atmosphärenprozessoren (old)|
|Institutes and Institutions:||Remote Sensing Technology Institute > Atmospheric Processors|
|Deposited By:||Dr.rer.nat. Franz Schreier|
|Deposited On:||02 Nov 2010 13:51|
|Last Modified:||08 Nov 2010 11:24|
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