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  4. From hygroscopic aerosols to cloud droplets: The HygrA-CD campaign in the Athens basin -- An overview
 
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research article

From hygroscopic aerosols to cloud droplets: The HygrA-CD campaign in the Athens basin -- An overview

Papayannis, A.
•
Argyrouli, A.
•
Bougiatioti, A.
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2017
Science of the Total Environment

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.

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Type
research article
DOI
10.1016/j.scitotenv.2016.09.054
Author(s)
Papayannis, A.
•
Argyrouli, A.
•
Bougiatioti, A.
•
Remoundaki, E.
•
Vratolis, S.
•
Nenes, Athanasios  
•
Solomos, S.
•
Komppula, M.
•
Giannakaki, E.
•
Kalogiros, J.
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Date Issued

2017

Publisher

Elsevier B.V.

Published in
Science of the Total Environment
Volume

574

Start page

216

End page

233

Subjects

Aerosol chemical properties

•

Aerosol Raman lidar

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Athens

•

CCN

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Cloud development

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Cloud droplet number

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Doppler lidar

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FLEXPART model

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Greece

•

HygrA-CD

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Precipitation radar

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SMPS

•

WRF

•

Aerosols

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Boundary layers

•

Chemical properties

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Coastal zones

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Drops

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Gallium alloys

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Optical radar

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Shape memory effect

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Supersaturation

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Athens

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Cloud development

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Cloud droplet number

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Doppler lidars

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FLEXPART

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Greece

•

HygrA-CD

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Precipitation radar

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Raman LIDAR

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SMPS

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Precipitation (meteorology)

•

aerosol

•

aerosol formation

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cloud condensation nucleus

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cloud droplet

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convective boundary layer

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Doppler lidar

•

Doppler radar

•

hygroscopicity

•

physicochemical property

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weather forecasting

•

wind velocity

•

aerosol

•

airflow

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Article

•

biomass

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cloud

•

concentration (parameters)

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environmental impact

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experimental study

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Greece

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high temperature procedures

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human activities

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marine environment

•

particle size

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physical chemistry

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precipitation

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priority journal

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velocity

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wind

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Athens [Attica]

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Attica

•

Greece

Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
LAPI  
Available on Infoscience
October 15, 2018
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/148890
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