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Title: Observed aerosol suppression of cloud ice in low-level Arctic mixed-phase clouds

Abstract

Here, the interactions that occur between aerosols and a mixed-phase cloud system, and the subsequent alteration of the microphysical state of such clouds, are a problem that has yet to be well constrained. Advancing our understanding of aerosol–ice processes is necessary to determine the impact of natural and anthropogenic emissions on Earth's climate and to improve our capability to predict future climate states. This paper deals specifically with how aerosols influence ice mass production in low-level Arctic mixed-phase clouds. In this study, a 9-year record of aerosol, cloud and atmospheric state properties is used to quantify aerosol influence on ice production in mixed-phase clouds. It is found that mixed-phase clouds present in a clean aerosol state have higher ice water content (IWC) by a factor of 1.22 to1.63 at cloud base than do similar clouds in cases with higher aerosol loading. We additionally analyze radar-derived mean Doppler velocities to better understand the drivers behind this relationship, and we conclude tha taerosol induced reduction of the ice crystal nucleation rate, together with decreased riming rates in polluted clouds, are likely influences on the observed reductions in IWC.

Authors:
 [1];  [2]; ORCiD logo [2]
  1. Univ. of Colorado, Boulder, CO (United States)
  2. Univ. of Colorado, Boulder, CO (United States); National Oceanic and Atmospheric Administration, Boulder, CO (United States)
Publication Date:
Research Org.:
Univ. of Colorado, Denver, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1502124
Grant/Contract Number:  
SC0008794; SC0011918; SC0013306
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 18; Journal Issue: 18; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Norgren, Matthew S., de Boer, Gijs, and Shupe, Matthew D. Observed aerosol suppression of cloud ice in low-level Arctic mixed-phase clouds. United States: N. p., 2018. Web. doi:10.5194/acp-18-13345-2018.
Norgren, Matthew S., de Boer, Gijs, & Shupe, Matthew D. Observed aerosol suppression of cloud ice in low-level Arctic mixed-phase clouds. United States. doi:10.5194/acp-18-13345-2018.
Norgren, Matthew S., de Boer, Gijs, and Shupe, Matthew D. Wed . "Observed aerosol suppression of cloud ice in low-level Arctic mixed-phase clouds". United States. doi:10.5194/acp-18-13345-2018. https://www.osti.gov/servlets/purl/1502124.
@article{osti_1502124,
title = {Observed aerosol suppression of cloud ice in low-level Arctic mixed-phase clouds},
author = {Norgren, Matthew S. and de Boer, Gijs and Shupe, Matthew D.},
abstractNote = {Here, the interactions that occur between aerosols and a mixed-phase cloud system, and the subsequent alteration of the microphysical state of such clouds, are a problem that has yet to be well constrained. Advancing our understanding of aerosol–ice processes is necessary to determine the impact of natural and anthropogenic emissions on Earth's climate and to improve our capability to predict future climate states. This paper deals specifically with how aerosols influence ice mass production in low-level Arctic mixed-phase clouds. In this study, a 9-year record of aerosol, cloud and atmospheric state properties is used to quantify aerosol influence on ice production in mixed-phase clouds. It is found that mixed-phase clouds present in a clean aerosol state have higher ice water content (IWC) by a factor of 1.22 to1.63 at cloud base than do similar clouds in cases with higher aerosol loading. We additionally analyze radar-derived mean Doppler velocities to better understand the drivers behind this relationship, and we conclude tha taerosol induced reduction of the ice crystal nucleation rate, together with decreased riming rates in polluted clouds, are likely influences on the observed reductions in IWC.},
doi = {10.5194/acp-18-13345-2018},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 18,
volume = 18,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
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