Global Simulations of ice Nucleation and Ice Supersaturation with an Improved Cloud Scheme in the Community Atmosphere Model
©2010 by the American Geophysical Union. 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 with respect to ice, (2) ice nucleatio...
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Online Access: | https://hdl.handle.net/20.500.11919/701 https://doi.org/10.1029/2009JD013797 |
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ftcolostateunidc:oai:mountainscholar.org:20.500.11919/701 2023-05-15T14:54:11+02:00 Global Simulations of ice Nucleation and Ice Supersaturation with an Improved Cloud Scheme in the Community Atmosphere Model 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. 2010-01-01 application/pdf https://hdl.handle.net/20.500.11919/701 https://doi.org/10.1029/2009JD013797 English eng eng University of Wyoming. Libraries Faculty Publications - Atmospheric Science https://hdl.handle.net/20.500.11919/701 doi:10.1029/2009JD013797 Atmospheric Science Faculty Publications Aerosol particles Cloud forcing Community atmosphere model Field observations Global simulation Heterogeneous freezing Ice clouds Ice mass Ice nucleation Microphysics Mixed-phase cloud National center for atmospheric researches New model Nucleation mechanism Surface radiative flux Cams Climatology Clouds Computer simulation Freezing Nucleation Physics Supersaturation Ice aerosol atmospheric modeling cloud cover cloud microphysics Arctic Engineering Journal contribution 2010 ftcolostateunidc https://doi.org/20.500.11919/701 https://doi.org/10.1029/2009JD013797 2021-07-14T20:29:54Z ©2010 by the American Geophysical Union. 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 with respect to ice, (2) ice nucleation by aerosol particles, and (3) ice cloud cover consistent with ice microphysics. The scheme is implemented with a two-moment microphysics code and is used to evaluate ice cloud nucleation mechanisms and supersaturation in CAM. The new model is able to reproduce field observations of ice mass and mixed phase cloud occurrence better than previous versions. The model is able to reproduce observed patterns and frequency of ice supersaturation. Simulations indicate homogeneous freezing of sulfate and heterogeneous freezing on dust are both important ice nucleation mechanisms, in different regions. Simulated cloud forcing and climate is sensitive to different formulations of the ice microphysics. Arctic surface radiative fluxes are sensitive to the parameterization of ice clouds. These results indicate that ice clouds are potentially an important part of understanding cloud forcing and potential cloud feedbacks, particularly in the Arctic. Other Non-Article Part of Journal/Newspaper Arctic Digital Collections of Colorado (Colorado State University) Arctic Journal of Geophysical Research 115 D18 |
institution |
Open Polar |
collection |
Digital Collections of Colorado (Colorado State University) |
op_collection_id |
ftcolostateunidc |
language |
English |
topic |
Aerosol particles Cloud forcing Community atmosphere model Field observations Global simulation Heterogeneous freezing Ice clouds Ice mass Ice nucleation Microphysics Mixed-phase cloud National center for atmospheric researches New model Nucleation mechanism Surface radiative flux Cams Climatology Clouds Computer simulation Freezing Nucleation Physics Supersaturation Ice aerosol atmospheric modeling cloud cover cloud microphysics Arctic Engineering |
spellingShingle |
Aerosol particles Cloud forcing Community atmosphere model Field observations Global simulation Heterogeneous freezing Ice clouds Ice mass Ice nucleation Microphysics Mixed-phase cloud National center for atmospheric researches New model Nucleation mechanism Surface radiative flux Cams Climatology Clouds Computer simulation Freezing Nucleation Physics Supersaturation Ice aerosol atmospheric modeling cloud cover cloud microphysics Arctic Engineering 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. Global Simulations of ice Nucleation and Ice Supersaturation with an Improved Cloud Scheme in the Community Atmosphere Model |
topic_facet |
Aerosol particles Cloud forcing Community atmosphere model Field observations Global simulation Heterogeneous freezing Ice clouds Ice mass Ice nucleation Microphysics Mixed-phase cloud National center for atmospheric researches New model Nucleation mechanism Surface radiative flux Cams Climatology Clouds Computer simulation Freezing Nucleation Physics Supersaturation Ice aerosol atmospheric modeling cloud cover cloud microphysics Arctic Engineering |
description |
©2010 by the American Geophysical Union. 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 with respect to ice, (2) ice nucleation by aerosol particles, and (3) ice cloud cover consistent with ice microphysics. The scheme is implemented with a two-moment microphysics code and is used to evaluate ice cloud nucleation mechanisms and supersaturation in CAM. The new model is able to reproduce field observations of ice mass and mixed phase cloud occurrence better than previous versions. The model is able to reproduce observed patterns and frequency of ice supersaturation. Simulations indicate homogeneous freezing of sulfate and heterogeneous freezing on dust are both important ice nucleation mechanisms, in different regions. Simulated cloud forcing and climate is sensitive to different formulations of the ice microphysics. Arctic surface radiative fluxes are sensitive to the parameterization of ice clouds. These results indicate that ice clouds are potentially an important part of understanding cloud forcing and potential cloud feedbacks, particularly in the Arctic. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
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. |
author_facet |
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. |
author_sort |
Gettelman, A. |
title |
Global Simulations of ice Nucleation and Ice Supersaturation with an Improved Cloud Scheme in the Community Atmosphere Model |
title_short |
Global Simulations of ice Nucleation and Ice Supersaturation with an Improved Cloud Scheme in the Community Atmosphere Model |
title_full |
Global Simulations of ice Nucleation and Ice Supersaturation with an Improved Cloud Scheme in the Community Atmosphere Model |
title_fullStr |
Global Simulations of ice Nucleation and Ice Supersaturation with an Improved Cloud Scheme in the Community Atmosphere Model |
title_full_unstemmed |
Global Simulations of ice Nucleation and Ice Supersaturation with an Improved Cloud Scheme in the Community Atmosphere Model |
title_sort |
global simulations of ice nucleation and ice supersaturation with an improved cloud scheme in the community atmosphere model |
publisher |
University of Wyoming. Libraries |
publishDate |
2010 |
url |
https://hdl.handle.net/20.500.11919/701 https://doi.org/10.1029/2009JD013797 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Atmospheric Science Faculty Publications |
op_relation |
Faculty Publications - Atmospheric Science https://hdl.handle.net/20.500.11919/701 doi:10.1029/2009JD013797 |
op_doi |
https://doi.org/20.500.11919/701 https://doi.org/10.1029/2009JD013797 |
container_title |
Journal of Geophysical Research |
container_volume |
115 |
container_issue |
D18 |
_version_ |
1766325911160881152 |