Abstract
Vertical profiles of number concentrations of dust particles relevant for ice nucleation in clouds are derived from lidar measurements. The results are compared to coincidental airborne in-situ measurements of particle number and surface area concentrations in the dust layer. The observations were performed in long- range transported Saharan dust at Barbados and Asian dust at Cyprus. The Asian dust data analysis is ongoing. A comparison of Asian and Saharan dust will be given at the conference. Concentrations of ice nucleating particles in the order of 10 to 1000 per cm-3 in the dust layer are derived for a temperature of -25°C at Barbados. The method can be used to continuously monitor the concentration of ice nucleating dust particles vertically resolved from lidar measurements.
Highlights
Dust particles influence visibility and health, and cloud properties
The method to derive ice nucleating particles (INP) concentrations from polarization lidar measurements presented by Mamouri and Ansmann, 2016, [7] showed for the presented case study good agreement for the basic quantities of particle number concentration and surface area concentration compared to coincidental airborne in-situ observations at Barbados
The quality of the derived INP concentration depends on the parametrizations from laboratory measurements
Summary
In the formation of clouds they serve as cloud condensation nuclei (CCN) Their ability to partly serve as ice nucleating particles (INP) influences ice formation and precipitation and the hydrological cycle as a whole. To improve our understanding of the interaction between dust particles and cloud properties and precipitation processes, vertical profiles of dust related INP would be beneficial. We present results from two campaigns, the Saharan Aerosol Long-range Transport and Aerosol–Cloud-interaction Experiment (SALTRACE) at Barbados [8] and A-Life (Absorbing aerosol layers in a changing climate: aging, lifetime and dynamics) at Cyprus. In both campaigns the Falcon aircraft performed
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