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IMPACT OF 3D CLOUD STRUCTURES ON THE ATMOSPHERIC TRACE GAS PRODUCTS FROM UV-VIS SOUNDERS

ESA Open Invitation to Tender AO9237
Open Date: 16/03/2018
Closing Date: 30/04/2018 13:00:00

Status: ISSUED
Reference Nr.: 18.155.03
Prog. Ref.: EO-Science for Socie
Budget Ref.: E/E105-E5 - EO-Science for Socie
Special Prov.: BE+DK+FR+DE+IT+NL+ES+SE+CH+GB+IE+AT+NO+FI+PT+GR+LU+CZ+RO+PL+EE+CA+SI
Tender Type: C
Price Range: 100-200 KEURO
Techology Domains: Others
Establishment: ESTEC
Directorate: Directorate of EO Programmes
Department: Science, Applications & Climate Dep.
Division: Earth and Mission Sciences Division
Contract Officer: Perez, Guiomar
Industrial Policy Measure: N/A - Not apply
Last Update Date: 16/03/2018
Update Reason: Tender issue

The Copernicus missions Sentinel-4 (S4), Sentinel-5 (S5), and the Sentinel-5 Precursor (S5P) are dedicated to atmospheric composition. The key mission products cover various trace gases including NO2. Clouds have a significant impact on the radiation field and hence on the measurement sensitivity and the final trace gas products. In heritage retrieval schemes, this impact is typically accounted for using simplistic cloud characteristics such as spatial sample-averaged cloud fraction, top height, and optical depth. The measurement sensitivity can be affected also by more complex features such as horizontal heterogeneity at the sub-sample scale and vertical layering of clouds, bright cloud edges, and cloud shadows. At present, the impact of 3D cloud features on tropospheric trace gas products observations from the atmospheric Sentinels is not understood quantitatively. The first objective is to enhance the understanding of the sensitivity of NO2 products from the atmospheric Sentinels to 3D cloud structures. The second objective is to explore ways to improve the handling of cloudy scenes and to mitigate biases due to 3D cloud structures. This activity focuses on the NO2 product as a key tropospheric trace gas measured by the atmospheric Sentinels.

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