
AMC-DOAS
DOAS
SCIAMACHY
GOME
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AMC-DOAS Water Vapour Data Products: Release Notes
Version
1.1 Version 1.0
Version 0.9.1 and
earlier
Version 1.1
- Currently only available for SCIAMACHY data.
- Reprocessed data set covering the whole SCIAMACHY
mission (Aug 2002 to Apr 2012).
- Same retrieval program as for V1.0 has been used.
- Based on consolidated set of SCIAMACHY Level 1 V7(W)
data files.
Version 1.0
- The retrieval uses an updated radiative transfer data
base which is based on HITRAN2004.
- The calculation of errors has been updated; it now
also considers a correction factor for unweighted data.
- GOME water vapour data are based on fully calibrated
consolidated Level 1 products only.
- The SCIAMACHY water vapour data are mainly derived
from the SCIAMACHY reprocessed Level 1b V5 data set.
Gaps in this data set have been filled (if possible) by
NRT data of either V5 or V6 (since May 2006).
- In the extraction of the SCIAMACHY Level 1b radiances
only memory effect correction, dark current correction
and wavelength calibration are applied.
- All SCIAMACHY data have been processed using an
uncalibrated ASM diffuser solar reference spectrum. When
no actual ASM diffuser spectrum was available (like for
2002 data), the ASM diffuser spectrum of 9 April 2003
(also provided in the Level 1b product) was used.
Therefore the quality of the 2002 SCIAMACHY water vapour
data is slightly reduced compared to later years.
- The Doppler shift for the SCIAMACHY solar reference
spectrum is read from the Level 1b product.
- The status flag in the SCIAMACHY water vapour product
is used.
- Note: The combination of the new HITRAN data base
results in typically smaller water vapour columns as in
previous versions. This is especially true for SCIAMACHY
data which are additionally based on updated spectral
data.
Version 0.9.1
and earlier
- GOME water vapour data are based on fully calibrated
consolidated Level 1 products only.
- The SCIAMACHY water vapour data are derived from both
SCIAMACHY NRT and consolidated Level 1b data products of
Versions 4 and 5.
- All SCIAMACHY data have been processed using a
dedicated solar reference spectrum based on SCIAMACHY
ESM diffuser measurements provided by ESA.
- A fixed Doppler shift for the SCIAMACHY solar
reference spectrum is considered (0.01 nm at 500 nm).
- For the SCIAMACHY radiances, all calibration steps
have been switched on during the extraction of the L1c
product except polarisation correction.
- The status flag in the SCIAMACHY product is currently
unused.
More information is given in the Algorithm
Description and the Product Specification Document.
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