Quantifying the impact of dust on heterogeneous ice generation in midlevel supercooled stratiform clouds

AMS Citation:
Zhang, D., Z. Wang, A. J. Heymsfield, J. Fan, D. Liu, and M. Zhao, 2012: Quantifying the impact of dust on heterogeneous ice generation in midlevel supercooled stratiform clouds. Geophysical Research Letters, 39, 6 pp, doi:10.1029/2012GL052831.
Date:2012-09-26
Resource Type:article
Title:Quantifying the impact of dust on heterogeneous ice generation in midlevel supercooled stratiform clouds
Abstract: Dust aerosols have been regarded as effective ice nuclei (IN), but large uncertainties regarding their efficiencies remain. Here, four years of collocated CALIPSO and CloudSat measurements are used to quantify the impact of dust on heterogeneous ice generation in midlevel supercooled stratiform clouds (MSSCs) over the 'dust belt'. The results show that the dusty MSSCs have an up to 20% higher mixed-phase cloud occurrence, up to 8 dBZ higher mean maximum Ze (Ze_max), and up to 11.5 g/m2 higher ice water path (IWP) than similar MSSCs under background aerosol conditions. Assuming similar ice growth and fallout history in similar MSSCs, the significant differences in Ze_max between dusty and non-dusty MSSCs reflect ice particle number concentration differences. Therefore, observed Ze_max differences indicate that dust could enhance ice particle concentration in MSSCs by a factor of 2 to 6 at temperatures colder than -12°C. The enhancements are strongly dependent on the cloud top temperature, large dust particle concentration and chemical compositions. These results imply an important role of dust particles in modifying mixed-phase cloud properties globally.
Peer Review:Refereed
Copyright Information:Copyright 2012 American Geophysical Union.
OpenSky citable URL: ark:/85065/d7j38t94
Publisher's Version: 10.1029/2012GL052831
Author(s):
  • Damao Zhang
  • Zhien Wang
  • Andrew Heymsfield - NCAR/UCAR
  • Jiwen Fan
  • Dong Liu
  • Ming Zhao
  • Random Profile

    ADMIN ASSISTANT III

    Recent & Upcoming Visitors