Community Research and Development Information Service - CORDIS

FP5

QUILT Report Summary

Project ID: EVK2-CT-2000-00059
Funded under: FP5-EESD
Country: Belgium

Radiative transfer model validation package

The present radiative transfer (RT) model validation package is the deliverable of the QUILT project. Its purpose is to enable the testing of RT codes aiming to the calculation of AMFs(air mass factors)/slant columns as required for ground-based DOAS (Differential Optical Absorption Spectroscopy) and MAX-DOAS applications.

The package focus on the simulation of:
- Zenith-sky observations of BrO, NO2, and OClO, taking into account the photochemical variation of these species and

- Off-axis observations of BrO, NO2, and HCHO, the photochemical variation of the species being not taken into account in this case.

The initialisation data and results come from an intercomparison exercise between seven RT models carried out within the framework of QUILT. The different models and comparison tests are described in a word document included in the package.

In brief, the following tests have been performed:
- Calculation of BrO, OClO, and NO2 SCDs for sunset conditions in zenith-sky geometry, single (SS) and multiple scattering (MS) modes ["preliminary test 1"].

- Calculation of BrO and HCHO SCDs in off-axis geometry, MS mode and for 90° of azimuthal angle of line of sight. The elevation degrees are 5°, 20°, and 40° for BrO, and 5°, 10°, and 20° for HCHO ["preliminary test 2"].

- Test on the impact of aerosol scattering in off-axis geometry: Calculation of NO2 SCDs with and without aerosol scattering in MS mode, for 30° of azimuthal angle of line of sight, and for 5°, 20°, and 40° of elevation.

- Test on the impact of ground albedo in off-axis geometry: Calculation of HCHO SCDs for ground albedo values of 0 and 0.9 in MS mode, for 90° of azimuthal angle of line of sight, and for 5°, 20°, and 40° of elevation.

The plots of the single profiles used for the tests in off-axis geometry appear in the file "offaxis_profiles_plots.jpeg". Absorption by O3 is included in all calculations. Absorption by NO2 is also included in the calculation of BrO, OClO, and HCHO SCDs.

More information on the QUILT project can be found at: http://nadir.nilu.no/quilt/index.php.

Related information

Contact

François HENDRICK, (Research scientist)
Tel.: +32-2-3736766
Fax: +32-2-3748423
E-mail
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