Browsing University of Wyoming by Subject "ice"

Global Simulations of ice Nucleation and Ice Supersaturation with an Improved Cloud Scheme in the Community Atmosphere Model

Author(s):Gettelman, A.; Liu, Xiaohong; Ghan, S. J.; Morrison, H.; Park, S.; Conley, A. J.; Klein, S. A.; Boyle, J.; Mitchell, D. L.; Li, J.-L.F.
Date:2010-01-01

A process-based treatment of ice supersaturation and ice nucleation is implemented in the National Center for Atmospheric Research Community Atmosphere Model (CAM). The new scheme is designed to allow (1) supersaturation ...

Enhanced Solar Energy Absorption by Internally-Mixed Black Carbon in Snow Grains

Author(s):Flanner, M. G.; Liu, Xiaohong; Zhou, C.; Penner, J. E.; Jiao, C.
Date:2012-05-30

Here we explore light absorption by snowpack containing black carbon (BC) particles residing within ice grains. Basic considerations of particle volumes and BC/snow mass concentrations show that there are generally 0.05-109 ...

Quantifying the Impact of Dust on Heterogeneous Ice Generation in Midlevel Supercooled Stratiform Clouds

Author(s):Zhang, Damao; Wang, Zhien; Heymsfield, Andrew; Fan, Jiwen; Liu, Dong; Zhao, Ming
Date:2012-09-26

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 ...

Sensitivity Studies of Dust Ice Nuclei Effect on Cirrus Clouds with the Community Atmosphere Model CAM5

Author(s):Liu, Xiaohong; Shi, X.; Zhang, K.; Jensen, E. J.; Gettelman, A.; Barahona, D.; Nenes, A.; Lawson, P.
Date:2012-12-19

In this study the effect of dust aerosol on upper tropospheric cirrus clouds through heterogeneous ice nucleation is investigated in the Community Atmospheric Model version 5 (CAM5) with two ice nucleation parameterizations. ...

Evaluation of Several A-Train Ice Cloud Retrieval Products with in Situ Measurements Collected During the SPARTICUS Campaign

Author(s):Deng, Min; Mace, G. G.; Wang, Z.; Lawson, R. Paul
Date:2013-04-01

In this study several ice cloud retrieval products that utilize active and passive A-Train measurements are evaluated using in situ data collected during the Small Particles in Cirrus (SPARTICUS) field campaign. The retrieval ...

Sensitivity of CAM5-Simulated Arctic Clouds and Radiation to Ice Nucleation Parameterization

Author(s):Xie, S.; Liu, Xiaohong; Zhao, C.; Zhang, Y.
Date:2013-08-15

Sensitivity of Arctic clouds and radiation in the Community Atmospheric Model, version 5, to the ice nucleation process is examined by testing a new physically based ice nucleation scheme that links the variation of ice ...

Improved Cirrus Simulations in a General Circulation Model Using CARMA Sectional Microphysics

Author(s):Bardeen, C. G.; Gettelman, A.; Jensen, E.J.; Heymsfield, A.; Conley, A. J.; Delanoë, J.; Deng, Min; Toon, O. B.
Date:2013-10-21

We have developed a new cirrus model incorporating sectional ice microphysics from the Community Aerosol and Radiation Model for Atmospheres (CARMA) in the latest version of NCAR's Community Atmosphere Model (CAM5). ...

Relationships Between Ice Water Content and Volume Extinction Coefficient from in Situ Observations for Temperatures from 0° to -86°C : Implications for Spaceborne Iidar Retrievals

Author(s):Heymsfield, A.; Winker, D.; Avery, M.; Vaughan, M.; Diskin, G.; Deng, Min; Mitev, V.; Matthey, R.
Date:2014-02-01

An examination of 2 yr of Cloud-Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) lidar observations and CloudSat cloud radar observations shows that ice clouds at temperatures below about -45°C frequently ...