Dresden 2011 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 4: Climate; jointly with Arbeitsgruppe Junge DPG (AGjDPG)
UP 4.2: Hauptvortrag
Mittwoch, 16. März 2011, 14:30–15:00, HSZ 201
Measuring cloud droplets: one step towards a better understanding of clouds — •Johanna Katharina Spiegel1, Thomas Peter2, Nina Buchmann1, and Werner Eugster1 — 1Institute for Agricultural Sciences, ETH Zurich, Zurich, Switzerland — 2Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland
The bulk properties of clouds and therefore their behaviour in the global climate system are determined by microphysical properties. For example, optical properties of warm and mixed-phase clouds strongly depend on droplet size and number distribution. For the validation of climate models as well as to generally improve the understanding of the physical properties of clouds, measurements of cloud droplet size and number in combination with meteorological variables and aerosol properties are important. In this study we present preliminary results from several cloud and fog characterization campaigns, where droplets were measured using a forward scattering spectrometer probe (DMT Fog Monitor FM-100, Droplet Measurement Technologies, Boulder, CO, USA). We highlight the challenges of our measurement technique, focusing on the uncertainty associated with the determination of droplet sizes and hence liquid water content of clouds and fog, and will make an attempt to link cloud properties to other measured variables such as aerosol properties.