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)...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20150002132 2023-05-15T15:00:28+02:00 Intercomparison of Large-Eddy Simulations of Arctic Mixed-Phase Clouds: Importance of Ice Size Distribution Assumptions Harrington, Jerry Korolev, Alexei Hoose, Corinna Paukert, Marco McFarquhar, Greg M. Ghan, Steven Ovchinnikov, Mikhail Ackerman, Andrew S. Fridlind, Ann M. Cheng, Anning Sulia, Kara Savre, Julien Solomon, Amy Fan, Jiwen Morrison, Hugh Shipway, Ben J. Shupe, Matthew D. Avramov, Alexander Unclassified, Unlimited, Publicly available March 14, 2014 application/pdf http://hdl.handle.net/2060/20150002132 unknown Document ID: 20150002132 http://hdl.handle.net/2060/20150002132 Copyright, Distribution as joint owner in the copyright CASI Meteorology and Climatology GSFC-E-DAA-TN19717 Journal of Advances in Modeling Earth Systems; 6; 1; 223-248 2014 ftnasantrs 2019-07-21T00:18:08Z 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. Other/Unknown Material Arctic NASA Technical Reports Server (NTRS) Arctic |
institution |
Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Meteorology and Climatology |
spellingShingle |
Meteorology and Climatology Harrington, Jerry Korolev, Alexei Hoose, Corinna Paukert, Marco McFarquhar, Greg M. Ghan, Steven Ovchinnikov, Mikhail Ackerman, Andrew S. Fridlind, Ann M. Cheng, Anning Sulia, Kara Savre, Julien Solomon, Amy Fan, Jiwen Morrison, Hugh Shipway, Ben J. Shupe, Matthew D. Avramov, Alexander Intercomparison of Large-Eddy Simulations of Arctic Mixed-Phase Clouds: Importance of Ice Size Distribution Assumptions |
topic_facet |
Meteorology and Climatology |
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. |
format |
Other/Unknown Material |
author |
Harrington, Jerry Korolev, Alexei Hoose, Corinna Paukert, Marco McFarquhar, Greg M. Ghan, Steven Ovchinnikov, Mikhail Ackerman, Andrew S. Fridlind, Ann M. Cheng, Anning Sulia, Kara Savre, Julien Solomon, Amy Fan, Jiwen Morrison, Hugh Shipway, Ben J. Shupe, Matthew D. Avramov, Alexander |
author_facet |
Harrington, Jerry Korolev, Alexei Hoose, Corinna Paukert, Marco McFarquhar, Greg M. Ghan, Steven Ovchinnikov, Mikhail Ackerman, Andrew S. Fridlind, Ann M. Cheng, Anning Sulia, Kara Savre, Julien Solomon, Amy Fan, Jiwen Morrison, Hugh Shipway, Ben J. Shupe, Matthew D. Avramov, Alexander |
author_sort |
Harrington, Jerry |
title |
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 |
publishDate |
2014 |
url |
http://hdl.handle.net/2060/20150002132 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
CASI |
op_relation |
Document ID: 20150002132 http://hdl.handle.net/2060/20150002132 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766332565523791872 |