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  4. Aerosol-cloud drop concentration closure for clouds sampled during the International Consortium for Atmospheric Research on Transport and Transformation 2004 campaign
 
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research article

Aerosol-cloud drop concentration closure for clouds sampled during the International Consortium for Atmospheric Research on Transport and Transformation 2004 campaign

Fountoukis, C.
•
Nenes, Athanasios  
•
Meskhidze, N.
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2007
Journal of Geophysical Research Atmospheres

This study analyzes 27 cumuliform and stratiform clouds sampled aboard the CIRPAS Twin Otter during the 2004 International Consortium for Atmospheric Research on Transport and Transformation (ICARTT) experiment. The data set was used to assess cloud droplet closure using (1) a detailed adiabatic cloud parcel model and (2) a state-of-the-art cloud droplet activation parameterization. A unique feature of the data set is the sampling of highly polluted clouds within the vicinity of power plant plumes. Remarkable closure was achieved (much less than the 20% measurement uncertainty) for both parcel model and parameterization. The highly variable aerosol did not complicate the cloud droplet closure, since the clouds had low maximum supersaturation and were not sensitive to aerosol variations (which took place at small particle sizes). The error in predicted cloud droplet concentration was mostly sensitive to updraft velocity. Optimal closure is obtained if the water vapor uptake coefficient is equal to 0.06, but can range between 0.03 and 1.0. The sensitivity of cloud droplet prediction error to changes in the uptake coefficient, organic solubility and surface tension depression suggest that organics exhibit limited solubility. These findings can serve as much needed constraints in modeling of aerosol-cloud interactions in the North America; future in situ studies will determine the robustness of our findings. Copyright 2007 by the American Geophysical Union.

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Type
research article
DOI
10.1029/2006JD007272
Author(s)
Fountoukis, C.
•
Nenes, Athanasios  
•
Meskhidze, N.
•
Bahreini, R.
•
Conant, W. C.
•
Jonsson, H.
•
Murphy, S.
•
Sorooshian, A.
•
Varutbangkul, V.
•
Brechtel, F.
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Date Issued

2007

Publisher

Blackwell Publishing Ltd

Published in
Journal of Geophysical Research Atmospheres
Volume

112

Issue

D10

Article Number

D10S30

Subjects

Atmospheric aerosols

•

Clouds

•

Drops

•

Mathematical models

•

Parameterization

•

Sampling

•

Solubility

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Supersaturation

•

adiabatic process

•

aerosol

•

cloud droplet

•

cloud microphysics

•

concentration (composition)

•

data set

•

parameterization

•

particle size

•

stratiform cloud

•

supersaturation

•

updraft

•

water vapor

•

North America

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/20.500.14299/149062
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