Cloud characteristics and cloud radiative effects according to COSMO mesoscale model  and measurements

N. Chubarova; J. Khlestova; M. Shatunova; V. Platonov; G. Rivin; U. Görsdorf; R. Becker

doi:10.1117/12.2504340

13 December 2018 Cloud characteristics and cloud radiative effects according to COSMO mesoscale model and measurements

N. Chubarova, J. Khlestova, M. Shatunova, V. Platonov, G. Rivin, U. Görsdorf, R. Becker

Proceedings Volume 10833, 24th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 108331N (2018) https://doi.org/10.1117/12.2504340
Event: XXIV International Symposium, Atmospheric and Ocean Optics, Atmospheric Physics, 2018, Tomsk, Russian Federation

Abstract

We analyzed clouds macrophysics and their radiative effects according to COSMO mesoscale atmospheric model and measurements at Lindenberg Observatory (Germany). Different cloud parameters simulated by the model and derived from measurements of ground-based remote sounding systems as well as by measurements of the BSRN station have been compared for snow-free conditions during March-October, 2016. We show that simulated water vapor content (QV) values were higher than the observed ones in the middle and upper troposphere. Furthermore, the modeled cloud ice water content (QI) is significantly higher at these altitudes and the ice cloud water path (TQI) is ten times higher than the observed value. Typical values of TQI and of TQC (liquid cloud water path) lie within 3*10^-13-1.1 kg/m² and 0.0017-2.9 kg/m² , respectively with average values of 0.015 and 0.079 kg/m² correspondingly. We also found a positive bias with the measurements for the TQC greater than 0.1 kg/m² and a negative bias for other values. A clear nonlinear dependence of solar irradiance at ground against TQC values was obtained both from measurements and model experiments. We showed a significant (29%) underestimation of model solar irradiance for the same TQC values in overcast cloud conditions compared with the observations.

Citation Download Citation

N. Chubarova, J. Khlestova, M. Shatunova, V. Platonov, G. Rivin, U. Görsdorf, and R. Becker "Cloud characteristics and cloud radiative effects according to COSMO mesoscale model and measurements", Proc. SPIE 10833, 24th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 108331N (13 December 2018); https://doi.org/10.1117/12.2504340

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