Vertical Distribution Of Cloud Condensation Nuclei In Marine And Continental Air Masses Over Europe And Their Connection To The Cloud Droplet Number Distribution In Warm Clouds
Final Report Abstract
Marine environment: In the marine environment of the ACORES archipelago vertical profiles (17 flights) of CCN and also CDNC around Graciosa Island as well as almost a full month (July 2017) of CCN data at the 2225m asl mountain site Pico Mountain (Pico Island) were collected along with a full suite of other particle and meteorological parameters. For Pico Mountain site a rather low hygroscopicity parameter kappa was determined, which was found to be in agreement with findings by others and is attributed to long range transported aerosol reaching this free tropospheric mountain site. The vertical CCN and CDNC profiles were by means of the full microphysical information (e.g. humidity, heat fluxes and buoyant TKE production) divided into coupled and decoupled cloud cases. Concerning CCN / LWC link the difference between coupled and decoupled cases is rather weak, and might be mainly caused by the only slight variability in CCN number. Further, we observed that the fluctuation of the vertical updraft along with the available CCN (highly depended on the particle number size distribution) dominate ND. An increase in LWC was mainly due to an increase in number, combined with some contributions from droplet growth. The SPECS model proved well suited to model observed clouds. Continental environment: Based on a more than 4-year comprehensive data-set at the central European ACTRIS site Melpitz, Germany, a systematic seasonal analysis of aerosol activation characteristics and NCCN predictions was developed. This new parametrization for CCN prediction can be applied to other rural and continental regions with similar aerosol background conditions.
Publications
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(2020), Observations of aerosol, cloud, turbulence, and radiation properties at the top of the marine boundary layer over the Eastern North Atlantic Ocean: The ACORES campaign, Bull. Am. Meteorol. Soc., 1-59
Siebert, H., K.-E. Szodry, U. Egerer, B. Wehner, S. Henning, K. Chevalier, J. Lückerath, O. Welz, K. Weinhold, F. Lauermann, M. Gottschalk, A. Ehrlich, M. Wendisch, P. Fialho, G. Roberts, N. Allwayin, S. Schum, R. A. Shaw, C. Mazzoleni, L. Mazzoleni, J. L. Nowak, S. Malinowski, K. Karpinska, W. Kumala, D. Czyzewska, E. P. Luke, P. Kollias, R. Wood, and J. P. Mellado
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(2022), Aerosol activation characteristics and prediction at the central European ACTRIS research station Melpitz, Germany, ACPD
Wang, Y., S. Henning, L. Poulain, C. Lu, F. Stratmann, Y. Wang, S. Niu, H. Herrmann, and A. Wiedensohler
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(2022), Particles’ phase state variability in the North Atlantic free troposphere during summertime determined by different atmospheric transport patterns and sources, Atmos. Chem. Phys.
Cheng, Z., M. Morgenstern, B. B. Zhang, M. Fraund, N. N. Lata, R. Brimberry, M. A. Marcus, L. Mazzoleni, P. Fialho, S. Henning, B. Wehner, C. Mazzoleni, and S. China
