Intercomparison of large-eddy simulations of Arctic mixed-phase clouds: Importance of ice size distribution assumptions
Large-eddy simulations of mixed-phase Arctic clouds by 11 different models are analyzed with the goal of improving understanding and model representation of processes controlling the evolution of these clouds. In a case based on observations from the Indirect and Semi-Direct Aerosol Campaign (ISDAC)...
Published in: | Journal of Advances in Modeling Earth Systems |
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American Geophysical Union
2014
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ftncar:oai:drupal-site.org:articles_14041 2023-09-05T13:17:15+02:00 Intercomparison of large-eddy simulations of Arctic mixed-phase clouds: Importance of ice size distribution assumptions Ovchinnikov, Mikhail (author) Ackerman, Andrew (author) Avramov, Alexander (author) Cheng, Anning (author) Fan, Jiwen (author) Fridlind, Ann (author) Ghan, Steven (author) Harrington, Jerry (author) Hoose, Corinna (author) Korolev, Alexei (author) McFarquhar, Greg (author) Morrison, Hugh (author) Paukert, Marco (author) Savre, Julien (author) Shipway, Ben (author) Shupe, Matthew (author) Solomon, Amy (author) Sulia, Kara (author) 2014-03-01 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-020-517 https://doi.org/10.1002/2013MS000282 en eng American Geophysical Union Journal of Advances in Modeling Earth Systems http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-020-517 doi:10.1002/2013MS000282 ark:/85065/d7tb17t2 Copyright 2014 American Geophysical Union. Text article 2014 ftncar https://doi.org/10.1002/2013MS000282 2023-08-14T18:37:48Z Large-eddy simulations of mixed-phase Arctic clouds by 11 different models are analyzed with the goal of improving understanding and model representation of processes controlling the evolution of these clouds. In a case based on observations from the Indirect and Semi-Direct Aerosol Campaign (ISDAC), it is found that ice number concentration, Ni, exerts significant influence on the cloud structure. Increasing Ni leads to a substantial reduction in liquid water path (LWP), in agreement with earlier studies. In contrast to previous intercomparison studies, all models here use the same ice particle properties (i.e., mass-size, mass-fall speed, and mass-capacitance relationships) and a common radiation parameterization. The constrained setup exposes the importance of ice particle size distributions (PSDs) in influencing cloud evolution. A clear separation in LWP and IWP predicted by models with bin and bulk microphysical treatments is documented and attributed primarily to the assumed shape of ice PSD used in bulk schemes. Compared to the bin schemes that explicitly predict the PSD, schemes assuming exponential ice PSD underestimate ice growth by vapor deposition and overestimate mass-weighted fall speed leading to an underprediction of IWP by a factor of two in the considered case. Sensitivity tests indicate LWP and IWP are much closer to the bin model simulations when a modified shape factor which is similar to that predicted by bin model simulation is used in bulk scheme. These results demonstrate the importance of representation of ice PSD in determining the partitioning of liquid and ice and the longevity of mixed-phase clouds. NNX12AH90G DE-SC0008648 Article in Journal/Newspaper Arctic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Arctic Journal of Advances in Modeling Earth Systems 6 1 223 248 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Large-eddy simulations of mixed-phase Arctic clouds by 11 different models are analyzed with the goal of improving understanding and model representation of processes controlling the evolution of these clouds. In a case based on observations from the Indirect and Semi-Direct Aerosol Campaign (ISDAC), it is found that ice number concentration, Ni, exerts significant influence on the cloud structure. Increasing Ni leads to a substantial reduction in liquid water path (LWP), in agreement with earlier studies. In contrast to previous intercomparison studies, all models here use the same ice particle properties (i.e., mass-size, mass-fall speed, and mass-capacitance relationships) and a common radiation parameterization. The constrained setup exposes the importance of ice particle size distributions (PSDs) in influencing cloud evolution. A clear separation in LWP and IWP predicted by models with bin and bulk microphysical treatments is documented and attributed primarily to the assumed shape of ice PSD used in bulk schemes. Compared to the bin schemes that explicitly predict the PSD, schemes assuming exponential ice PSD underestimate ice growth by vapor deposition and overestimate mass-weighted fall speed leading to an underprediction of IWP by a factor of two in the considered case. Sensitivity tests indicate LWP and IWP are much closer to the bin model simulations when a modified shape factor which is similar to that predicted by bin model simulation is used in bulk scheme. These results demonstrate the importance of representation of ice PSD in determining the partitioning of liquid and ice and the longevity of mixed-phase clouds. NNX12AH90G DE-SC0008648 |
author2 |
Ovchinnikov, Mikhail (author) Ackerman, Andrew (author) Avramov, Alexander (author) Cheng, Anning (author) Fan, Jiwen (author) Fridlind, Ann (author) Ghan, Steven (author) Harrington, Jerry (author) Hoose, Corinna (author) Korolev, Alexei (author) McFarquhar, Greg (author) Morrison, Hugh (author) Paukert, Marco (author) Savre, Julien (author) Shipway, Ben (author) Shupe, Matthew (author) Solomon, Amy (author) Sulia, Kara (author) |
format |
Article in Journal/Newspaper |
title |
Intercomparison of large-eddy simulations of Arctic mixed-phase clouds: Importance of ice size distribution assumptions |
spellingShingle |
Intercomparison of large-eddy simulations of Arctic mixed-phase clouds: Importance of ice size distribution assumptions |
title_short |
Intercomparison of large-eddy simulations of Arctic mixed-phase clouds: Importance of ice size distribution assumptions |
title_full |
Intercomparison of large-eddy simulations of Arctic mixed-phase clouds: Importance of ice size distribution assumptions |
title_fullStr |
Intercomparison of large-eddy simulations of Arctic mixed-phase clouds: Importance of ice size distribution assumptions |
title_full_unstemmed |
Intercomparison of large-eddy simulations of Arctic mixed-phase clouds: Importance of ice size distribution assumptions |
title_sort |
intercomparison of large-eddy simulations of arctic mixed-phase clouds: importance of ice size distribution assumptions |
publisher |
American Geophysical Union |
publishDate |
2014 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-020-517 https://doi.org/10.1002/2013MS000282 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Journal of Advances in Modeling Earth Systems http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-020-517 doi:10.1002/2013MS000282 ark:/85065/d7tb17t2 |
op_rights |
Copyright 2014 American Geophysical Union. |
op_doi |
https://doi.org/10.1002/2013MS000282 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
6 |
container_issue |
1 |
container_start_page |
223 |
op_container_end_page |
248 |
_version_ |
1776198493201760256 |