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Microphysics of clouds at Kleiner Feldberg |
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| Authors: | B G Arends G P A Kos R Maser D Schell W Wobrock P Winkler J A Ogren K J Noone A Hallberg I B Svenningsson A Wiedensohler H -C Hansson A Berner I Solly C Kruisz |
| Institution: | (1) Netherlands Energy Research Foundation, ECN, P.O. Box 1, 1755 ZG Petten, The Netherlands;(2) Zentrum für Umweltforschung und Institut für Meteorologie und Geophysik, Johann Wolfgang Goethe Universität Frankfurt, Georg-Voigt-Straße 14, D-60325 Frankfurt a.M., Germany;(3) Deutscher Wetterdienst, Meteorologisches Observatorium Hamburg, Frahmredder 95, D-2000 Hamburg, Germany;(4) Department of Meteorology, Stockholm University, S-106 91 Stockholm, Sweden;(5) Department of Nuclear Physics, University of Lund, S-223 62 Lund, Sweden;(6) Institut für Experimentalphysik, Universität Wien, Strudlhofgasse 4, A-1090 Vienna, Austria;(7) Present address: NOAA/CMDL/R/E/CG, 325 Broadway, 80303-3328 Boulder, CO, USA;(8) Present address: Center for Atmospheric Chemistry Studies, Graduate School of Oceanography, 02882-1197 Narragansett, RI, USA;(9) Present address: Deutscher Wetterdienst, Meteorologisches Observatorium Hohenpeissenberg, Albin Schwaiger Weg 10, D-82383 Hohenpeissenberg, Germany;(10) Present address: Laboratoire de Météorologie Physiques, Université Blaise Pascal, 24, Avenue des Landais, F-63177 Aubiere Cedex, France |
| Abstract: | During a field measuring campaign at Kleiner Feldberg (Taunus) in 1990, microphysical characteristics of clouds have been measured by Forward Scattering Spectrometer Probes (FSSP). The aim was to study the influence of aerosol and meteorological factors on droplet size and number. The results are: More mass in the accumulation size range of the aerosol leads to more droplets in stratocumulus clouds and to higher soluble masses in droplets of stratus clouds. However, the aerosol distribution was coarser in the stratus clouds compared to the stratocumulus clouds. Within the first 200 m from cloud base, the droplets grow while their number decreases. The growth results in a stable size of about 14 µm diameter over a large distance from cloud base in many stratocumulus clouds. Two types of mixing processes were observed: processes with reductions in the number of droplets (inhomogeneous mixing) and with reductions in the size of the droplets (homogeneous mixing). |
| Keywords: | cloud droplet size distribution microphysics |
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