Time evolution of activated aerosol particles in low clouds

0539624 - ÚCHP 2021 eng A - Abstrakt
Zíková, Naděžda - Pokorná, Petra - Pešice, Petr - Sedlák, Pavel - Ždímal, Vladimír
Time evolution of activated aerosol particles in low clouds.
Prague, 2020.
[EGU General Assembly 2020. 04.05.2020-08.05.2020, Vienna]
Grant CEP: GA ČR(CZ) GJ18-15065Y
Institucionální podpora: RVO:67985858 ; RVO:68378289
Klíčová slova: aerosol particles * climate changes * clouds
Obor OECD: Meteorology and atmospheric sciences; Meteorology and atmospheric sciences (UFA-U)
https://meetingorganizer.copernicus.org/EGU2020/EGU2020-2630.html

Atmospheric aerosol (AA) influences cloud formation, lifetime and other properties, the processes between AA and clouds are source of uncertainty in weather and climate changes estimations. Apart from airborne measurements, the processes in clouds can be also studied on fogs, or low clouds present at a station with high frequency of fog occurrence, such as at Milešovka, Czech Republic, where fog is present for almost 55 % of the time. At the observatory located on the top of the mountain, with a professional meteorological station and measurements of fog/cloud characterization and vertical cloud profile, an additional measurement of aerosol particle number size distributions (PNSD) was done. PNSD from 10 nm to 20 µm was conducted using SMPS and APS spectrometers, measuring activated and interstitial particles. From the activated PNSD (aPNSD), the activated fraction (AF) was estimated i.e. size dependent share of activated particles from all available ones. The AF was fitted with Sigmoidal function and the inflection point, D50, a lower estimate for an activation diameter of fog, was calculated.
Trvalý link: http://hdl.handle.net/11104/0317331