TY - JOUR
TI - From hygroscopic aerosols to cloud droplets: The HygrA-CD campaign in the Athens basin — An overview
AU - Papayannis, A.
AU - Argyrouli, A.
AU - Bougiatioti, A.
AU - Remoundaki, E.
AU - Vratolis, S.
AU - Nenes, A.
AU - Solomos, S.
AU - Komppula, M.
AU - Giannakaki, E.
AU - Kalogiros, J.
AU - Banks, R.
AU - Eleftheriadis, K.
AU - Mantas, E.
AU - Diapouli, E.
AU - Tzanis, C.G.
AU - Kazadzis, S.
AU - Binietoglou, I.
AU - Labzovskii, L.
AU - Vande Hey, J.
AU - Zerefos, C.S.
JO - The Science of the Total Environment
PY - 2017
VL - 574
TODO - null
SP - 216-233
PB - Elsevier B.V.
SN - 0048-9697
TODO - 10.1016/j.scitotenv.2016.09.054
TODO - Aerosols;  Boundary layers;  Chemical properties;  Coastal zones;  Drops;  Gallium alloys;  Optical radar;  Shape memory effect;  Supersaturation, Athens;  Cloud development;  Cloud droplet number;  Doppler lidars;  FLEXPART;  Greece;  HygrA-CD;  Precipitation radar;  Raman LIDAR;  SMPS, Precipitation (meteorology), aerosol;  aerosol formation;  cloud condensation nucleus;  cloud droplet;  convective boundary layer;  Doppler lidar;  Doppler radar;  hygroscopicity;  physicochemical property;  weather forecasting;  wind velocity, aerosol;  airflow;  Article;  biomass;  cloud;  concentration (parameters);  environmental impact;  experimental study;  Greece;  high temperature procedures;  human activities;  marine environment;  particle size;  physical chemistry;  precipitation;  priority journal;  velocity;  wind, Athens [Attica];  Attica;  Greece
TODO - The international experimental campaign Hygroscopic Aerosols to Cloud Droplets (HygrA-CD), organized in the Greater Athens Area (GAA), Greece from 15 May to 22 June 2014, aimed to study the physico-chemical properties of aerosols and their impact on the formation of clouds in the convective Planetary Boundary Layer (PBL). We found that under continental (W-NW-N) and Etesian (NE) synoptic wind flow and with a deep moist PBL (~ 2–2.5 km height), mixed hygroscopic (anthropogenic, biomass burning and marine) particles arrive over the GAA, and contribute to the formation of convective non-precipitating PBL clouds (of ~ 16–20 μm mean diameter) with vertical extent up to 500 m. Under these conditions, high updraft velocities (1–2 m s− 1) and cloud condensation nuclei (CCN) concentrations (~ 2000 cm− 3 at 1% supersaturation), generated clouds with an estimated cloud droplet number of ~ 600 cm− 3. Under Saharan wind flow conditions (S-SW) a shallow PBL (< 1–1.2 km height) develops, leading to much higher CCN concentrations (~ 3500–5000 cm− 3 at 1% supersaturation) near the ground; updraft velocities, however, were significantly lower, with an estimated maximum cloud droplet number of ~ 200 cm− 3 and without observed significant PBL cloud formation. The largest contribution to cloud droplet number variance is attributed to the updraft velocity variability, followed by variances in aerosol number concentration. © 2016 Elsevier B.V.
ER -