[Virtual] GFDL Lunchtime Seminar

Wed, Sep 23, 2020, 12:00 pm to 1:00 pm

Under CRESCENDO project we analysed 5 Earth-System-Models to comparetheir description of natural aerosols. This presentation will introduce briefly the main goals of the project and then it will report the main conclusions of an evaluation of the modelling of mineral dust. The motivation of the inter-comparison of mineral dust is because it is a key component in the atmosphere due to its interactions with radiation and clouds, as well as, precipitation, soil and chemical components. Earth Systems Models aims to include all those interactions to improve our knowledge of global dust cycle. However, they display important uncertainties and biases when compared against observations. Our study aims to identify those elements of current dust schemes that can be improved over global, regional and local scales. To achieve these goals we compare models against three networks of instruments for total dust deposition flux, yearly surface concentrations, and optical depths. Also we include a comparison with remote sensing products. We show how the role of larger particles remains challenging, although nudged simulations with surface winds of reanalysis improve the inter-model comparison. We identify regions where differences are larger like Asian deserts or Australia, and we reported important discrepancies regarding wet and dry deposition.

Location: 
Virtual
Speaker(s): 

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