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| Titel |
Sensitivity study for the retrieval of carbon dioxide from IASI observations using the KLIMA algorithm |
| VerfasserIn |
Ugo Cortesi, Samuele Del Bianco, Marco Gai, Bruno Carli |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250040989
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| Zusammenfassung |
| We report the results of a sensitivity study carried out on forward and inverse models of
the KLIMA algorithm with the aim of investigating the ultimate capabilities of
IASI-METOP observations for the retrieval of carbon dioxide information. The study was
conducted in the frame of KLIMA-IASI, an on-going project funded by ESA and
lead by IFAC-CNR in collaboration with IUP, University of Bremen. The final
goal of the project is to obtain accurate values of CO2 total column from level 2
analysis of IASI spectra, for the purpose of inter-comparison and cross-validation
with GOSAT products. The basic features of the KLIMA inversion code, originally
developed and tested by IFAC-CNR and subsequently adapted to the analysis of IASI
measurements, are provided and sensitivity tests conducted on the KLIMA-IASI forward
and retrieval codes are described in details. In the FM (Forward Model) sensitivity
study, a series of approximations was introduced to reduce the program size and
the running time of the code. The impact of these approximations on the accuracy
of the FM was evaluated and the results were used for implementing an overall
procedure optimally suited for the selected target. In the RM (Retrieval Model)
sensitivity study, further tests conducted on the ARM (Accelerated Retrieval Model)
version of the KLIMA-IASI code aimed at quantifying the bias on CO2 retrieval
products due to the FM approximations implemented by the trade-off process between
FM accuracy and efficiency. A summary of the consolidated results is provided
in terms of performances of the ARM for the retrieval of CO2 partial and total
columns. |
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