Table 2 - uploaded by Christophe Lerot
Content may be subject to copyright.
Source publication
Since the foundation of the SCIAMACHY Quality Working Group (SQWG) in a joint ESA-DLR-NIVR inter-agency effort in late 2006, the ESA operational Level 2 processor was significantly improved w.r.t. data quality and product range. During the last two years the product list was substantially enhanced by new (total columns of SO2, BrO, OClO, H2O, CO, L...
Citations
... Concentration profiles and/or vertical column densities (VCD's) are successfully retrieved from data recorded by infrared (IR) as well as ultraviolet–visible instruments. For the operational level 2 data processing of SCIAMACHY near IR observations, the " BIRRA " (Beer InfraRed Retrieval Algorithm) code has been developed at DLR [4] and recently been implemented as part of the official level 1b – 2 operational processor [5]. In view of the similarities between column density retrievals in the near and mid IR, a modified version of BIRRA called CERVISA (Column EstimatoR Vertical Infrared Sounding of the Atmosphere ) has been implemented recently for level 1 – 2 processing of nadir thermal IR sounding data. ...
Nadir infrared (IR) sounding can be used to derive information on trace gases relevant for climate and air quality. For vertical column density retrievals using SCIAMACHY near IR nadir observations, the BIRRA
(Beer InfraRed Retrieval Algorithm) code has recently been implemented in the operational level 1 – 2 processor. For analysis of thermal IR nadir observations of AIRS, GOSAT, IASI, or TES, a closely related code CERVISA (Column EstimatoR Vertical Infrared Sounding of the Atmosphere) has been developed. Both codes 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 near IR versus Schwarzschild’s equation for the thermal IR. For the ongoing validation of the BIRRA carbon monoxide CO and methane CH4 products intercomparisons with thermal IR sounding data are performed.
CERVISA retrieval results are compared both to the operational products of the IR sounder considered and to SCIAMACHY products retrieved with BIRRA.
