Ice particle production in mid-level stratiform mixed-phase clouds observed with collocated A-Train measurements
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Published:2018-03-28
Issue:6
Volume:18
Page:4317-4327
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Zhang DamaoORCID, Wang ZhienORCID, Kollias Pavlos, Vogelmann Andrew M.ORCID, Yang Kang, Luo TaoORCID
Abstract
Abstract. Collocated A-Train CloudSat radar and CALIPSO lidar measurements between 2006
and 2010 are analyzed to study primary ice particle production
characteristics in mid-level stratiform mixed-phase clouds on a global scale.
For similar clouds in terms of cloud top temperature and liquid water path,
Northern Hemisphere latitude bands have layer-maximum radar reflectivity (ZL)
that is ∼ 1 to 8 dBZ larger than their counterparts in the Southern
Hemisphere. The systematically larger ZL under similar cloud conditions
suggests larger ice number concentrations in mid-level stratiform mixed-phase
clouds over the Northern Hemisphere, which is possibly related to higher
background aerosol loadings. Furthermore, we show that springtime northern mid- and high
latitudes have ZL that is larger by up to 6 dBZ (a factor of 4
higher ice number concentration) than other seasons, which might be related
to more dust events that provide effective ice nucleating particles. Our
study suggests that aerosol-dependent ice number concentration
parameterizations are required in climate models to improve mixed-phase cloud
simulations, especially over the Northern Hemisphere.
Funder
U.S. Department of Energy National Aeronautics and Space Administration
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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