Status of SCIAMACHY Processors and Products

Transcription

1 Status of SCIAMACHY Processors and Products Sander Slijkhuis DLR-IMF ESTEC, 14 May 2001 S. Slijkhuis

2 Level 0 to 1 Level 1b I/ODD (product description) delivered to ESA ATBD being updated Status of SCIAMACHY User Manual unclear (no DLR-IMF responsibility) Industrial Level 0 to 1b processor coded, in final testing/debugging phase (comparison to DLR prototype) Level 1b to 1c processor (in package with ENVIVIEW) under developement by ESTEC IECF (calibration database) under developement by ESTEC Expected to be operational in SODAP phase (ESA decision) ( DLR prototype processor available for limited use by visitors to DLR-IMF ) S. Slijkhuis

3 Level 1 to 2 NRT (Nadir) Level 2 NRT I/ODD (product description) delivered to ESA ATBD (NRT part) has been updated Status of SCIAMACHY User Manual unclear (no DLR-IMF responsibility) Industrial Level 1b to 2 processor coded, in final testing/debugging phase (comparison to DLR prototype) First distribution of data products TBD (ESA decision) S. Slijkhuis

4 Level 1 to 2 Off-Line (Nadir+Limb) Level 2 off-line I/ODD (product description) delivered to ESA (draft final version) ATBD (OL part) has been updated but will be further developed Nadir: implementation of first version to be finished this summer (for nadir similar to GDP 2.4), an update will be made autumn 2001 Limb: first prototype received from Rob Spurr (SAO). Extensive testing and further development taking place: Convergence of global fit retrieval proved unsatisfactory; the problem was identified and the fitting library is being exchanged. An Optimal Estimation algorithm is being implemented. Priority will be given to obtain reliable O 3 and NO 2 profiles from UV/VIS region. RS will provide improved UV/VIS algo s mid-july and start improval for NIR mid-august First operational version planned atumn 2001 First distribution of data products TBD (ESA decision) - unlikely before start of validation 2002 S. Slijkhuis

5 Nadir Algorithms - Level 1b to 2 NRT NRT development for UV-VIS is based on the DOAS approach as used in GDP version 2.4 (February 1998) with some significant modifications: ICFA replaced by OCRA (using PMD signals w.r.t. cloud-free composite) LUT for total AMF (no split in AMF-tran for S.S. + LUT for M.S.) using MPI climatology; no tesselation algorithm (surface albedo is based on nearest-neighbour in database instead of using weighted mean of all neighbours) new AAIA calculation (absorbing aerosol index algorithm) possibility to choose various Sun references from Level 1b (governed by flag on L1b) NRT development for NIR uses new BIAS algorithm; p,t-dependent effective cross-sections calculated using the US Standard atmosphere S. Slijkhuis

6 Nadir Algorithms - Off-Line additional features Although the software architecture of the Nadir Off-line Processor is very different from the NRT (near-real time) Processor, the scientific algorithms to be used in the first software version (commissioning phase) are largely the same For the OL processor, it is foreseen to include in the Level 1b to 1c application a Red Grass correction (and possibly, for the NIR channels, a non-linearity correction) Use of 2 temperatures for O 3 fitting will be included An iterative DOAS/AMF approach for O 3 is under developement and will be included. It uses a neural network (NN), trained with TOMS (SAGE) climatology (O 3 profile dependent on total column); the NN uses 6 tables - 3 TOMS latitude regions over land and over sea (aerosol type selection) - input to the NN is slant column O 3, first guess total column O 3, geometry, cloud cover, cloud height, surface/cloud albedo - output is total column O 3 which is iterated. For BIAS, the use of more than one template atmosphere for the cross-sections is under developement (probably implemented autumn 2001) S. Slijkhuis