Aerosol and cloud properties through 3MI airborne simulator measurements: AEROCLO-sA field campaign in the Namibian region. - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Communication Dans Un Congrès Année : 2018

Aerosol and cloud properties through 3MI airborne simulator measurements: AEROCLO-sA field campaign in the Namibian region.

Résumé

Aerosols directly impact the Earth's climate by scattering and absorbing solar and telluric radiations and indirectly by modifying cloud properties and lifetime. In order to improve the retrieval of aerosol and cloud properties, the European Space Agency (ESA) and EUMESAT developed a new spaceborne imaging radiometer with Multi-viewing, Multichannel, Multi-polarization capabilities (3MI) which will be launched in 2021 (METOP-SG). A 3MI airborne simulator, OSIRIS, has been developed at Laboratoire d'Optique Atmospheric (LOA, France) in order to evaluate new retrieval algorithms for 3MI. The total and polarized radiances sampled by OSIRIS between 440 and 2200 nm, and the new retrieval algorithms (Dubovik et al. (2014), Waquet et al. (2013) and Peers et al. (2015)), allow to simultaneously retrieve the aerosol and surface properties over land and ocean, or the aerosol and cloud properties in case of aerosols above clouds. Different inversion methods are used as full image multi-pixel and single pixel retrievals. Recent airborne measurements performed over Namibia during the AEROCLO-sA campaign in August and September 2017 allowed to sample aerosol events associated with a strong optical thickness in biomass burning aerosols (up to 1.5 at 500 nm on the 5th of September). These particles were typically observed over bright deserts and above low-level stratocumulus clouds. 10 flights have been achieved with the Falcon-20 of SAFIRE during the campaign. Different vertical atmospheric structures and above different scenes have been observed including well-mixed plumes or strong stratification as well as decoupled or mixed aerosol-cloud layers. The application of retrieval algorithms to OSIRIS measurements during this campaign is reported in the present study. Comparison of different remote sensing observations such as the ones provided by the airborne sun-photometer PLASMA, and the LNG lidar (LATMOS), allow the validation of aerosol and cloud inversions from OSIRIS measurements. Sun-photometer optical thickness measurements and particles size distribution retrievals (Torres et al., 2017) performed during descents in spiral also give interesting information on the vertical aerosol distribution. The inversion method is also compared to available satellite retrievals (e.g. SEVIRI, MODIS and OMI).
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Dates et versions

insu-04446175 , version 1 (08-02-2024)

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A. Chauvigné, F. Waquet, F. Auriol, L. Blarel, C. Delegove, et al.. Aerosol and cloud properties through 3MI airborne simulator measurements: AEROCLO-sA field campaign in the Namibian region.. American Geophysical Union, Fall Meeting 2018, Dec 2018, Washington DC, United States. pp.abstract #A12C-07. ⟨insu-04446175⟩
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