Simulating mixed-phase Arctic stratus clouds: sensitivity to ice initiation mechanisms
The importance of Arctic mixed-phase clouds on radiation and the Arctic climate is well known. However, the development of mixed-phase cloud parameterization for use in large scale models is limited by lack of both related observations and numerical studies using multidimensional models with advance...
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ftosti:oai:osti.gov:934722 2023-07-30T04:01:13+02:00 Simulating mixed-phase Arctic stratus clouds: sensitivity to ice initiation mechanisms Sednev, Igor Sednev, I. Menon, S. McFarquhar, G. 2016-05-25 application/pdf http://www.osti.gov/servlets/purl/934722 https://www.osti.gov/biblio/934722 https://doi.org/10.5194/acpd-8-11755-2008 unknown http://www.osti.gov/servlets/purl/934722 https://www.osti.gov/biblio/934722 https://doi.org/10.5194/acpd-8-11755-2008 doi:10.5194/acpd-8-11755-2008 54 ENVIRONMENTAL SCIENCES ALASKA CLIMATES CLOUDS FREEZING PRECIPITATION RADAR RADIATIONS REFLECTIVITY SATURATION SCALE MODELS SENSITIVITY SUPERSATURATION WATER WATER VAPOR 2016 ftosti https://doi.org/10.5194/acpd-8-11755-2008 2023-07-11T08:46:15Z The importance of Arctic mixed-phase clouds on radiation and the Arctic climate is well known. However, the development of mixed-phase cloud parameterization for use in large scale models is limited by lack of both related observations and numerical studies using multidimensional models with advanced microphysics that provide the basis for understanding the relative importance of different microphysical processes that take place in mixed-phase clouds. To improve the representation of mixed-phase cloud processes in the GISS GCM we use the GISS single-column model coupled to a bin resolved microphysics (BRM) scheme that was specially designed to simulate mixed-phase clouds and aerosol-cloud interactions. Using this model with the microphysical measurements obtained from the DOE ARM Mixed-Phase Arctic Cloud Experiment (MPACE) campaign in October 2004 at the North Slope of Alaska, we investigate the effect of ice initiation processes and Bergeron-Findeisen process (BFP) on glaciation time and longevity of single-layer stratiform mixed-phase clouds. We focus on observations taken during 9th-10th October, which indicated the presence of a single-layer mixed-phase clouds. We performed several sets of 12-h simulations to examine model sensitivity to different ice initiation mechanisms and evaluate model output (hydrometeors concentrations, contents, effective radii, precipitation fluxes, and radar reflectivity) against measurements from the MPACE Intensive Observing Period. Overall, the model qualitatively simulates ice crystal concentration and hydrometeors content, but it fails to predict quantitatively the effective radii of ice particles and their vertical profiles. In particular, the ice effective radii are overestimated by at least 50%. However, using the same definition as used for observations, the effective radii simulated and that observed were more comparable. We find that for the single-layer stratiform mixed-phase clouds simulated, process of ice phase initiation due to freezing of supercooled water in both ... Other/Unknown Material Arctic north slope Alaska SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES ALASKA CLIMATES CLOUDS FREEZING PRECIPITATION RADAR RADIATIONS REFLECTIVITY SATURATION SCALE MODELS SENSITIVITY SUPERSATURATION WATER WATER VAPOR |
spellingShingle |
54 ENVIRONMENTAL SCIENCES ALASKA CLIMATES CLOUDS FREEZING PRECIPITATION RADAR RADIATIONS REFLECTIVITY SATURATION SCALE MODELS SENSITIVITY SUPERSATURATION WATER WATER VAPOR Sednev, Igor Sednev, I. Menon, S. McFarquhar, G. Simulating mixed-phase Arctic stratus clouds: sensitivity to ice initiation mechanisms |
topic_facet |
54 ENVIRONMENTAL SCIENCES ALASKA CLIMATES CLOUDS FREEZING PRECIPITATION RADAR RADIATIONS REFLECTIVITY SATURATION SCALE MODELS SENSITIVITY SUPERSATURATION WATER WATER VAPOR |
description |
The importance of Arctic mixed-phase clouds on radiation and the Arctic climate is well known. However, the development of mixed-phase cloud parameterization for use in large scale models is limited by lack of both related observations and numerical studies using multidimensional models with advanced microphysics that provide the basis for understanding the relative importance of different microphysical processes that take place in mixed-phase clouds. To improve the representation of mixed-phase cloud processes in the GISS GCM we use the GISS single-column model coupled to a bin resolved microphysics (BRM) scheme that was specially designed to simulate mixed-phase clouds and aerosol-cloud interactions. Using this model with the microphysical measurements obtained from the DOE ARM Mixed-Phase Arctic Cloud Experiment (MPACE) campaign in October 2004 at the North Slope of Alaska, we investigate the effect of ice initiation processes and Bergeron-Findeisen process (BFP) on glaciation time and longevity of single-layer stratiform mixed-phase clouds. We focus on observations taken during 9th-10th October, which indicated the presence of a single-layer mixed-phase clouds. We performed several sets of 12-h simulations to examine model sensitivity to different ice initiation mechanisms and evaluate model output (hydrometeors concentrations, contents, effective radii, precipitation fluxes, and radar reflectivity) against measurements from the MPACE Intensive Observing Period. Overall, the model qualitatively simulates ice crystal concentration and hydrometeors content, but it fails to predict quantitatively the effective radii of ice particles and their vertical profiles. In particular, the ice effective radii are overestimated by at least 50%. However, using the same definition as used for observations, the effective radii simulated and that observed were more comparable. We find that for the single-layer stratiform mixed-phase clouds simulated, process of ice phase initiation due to freezing of supercooled water in both ... |
author |
Sednev, Igor Sednev, I. Menon, S. McFarquhar, G. |
author_facet |
Sednev, Igor Sednev, I. Menon, S. McFarquhar, G. |
author_sort |
Sednev, Igor |
title |
Simulating mixed-phase Arctic stratus clouds: sensitivity to ice initiation mechanisms |
title_short |
Simulating mixed-phase Arctic stratus clouds: sensitivity to ice initiation mechanisms |
title_full |
Simulating mixed-phase Arctic stratus clouds: sensitivity to ice initiation mechanisms |
title_fullStr |
Simulating mixed-phase Arctic stratus clouds: sensitivity to ice initiation mechanisms |
title_full_unstemmed |
Simulating mixed-phase Arctic stratus clouds: sensitivity to ice initiation mechanisms |
title_sort |
simulating mixed-phase arctic stratus clouds: sensitivity to ice initiation mechanisms |
publishDate |
2016 |
url |
http://www.osti.gov/servlets/purl/934722 https://www.osti.gov/biblio/934722 https://doi.org/10.5194/acpd-8-11755-2008 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic north slope Alaska |
genre_facet |
Arctic north slope Alaska |
op_relation |
http://www.osti.gov/servlets/purl/934722 https://www.osti.gov/biblio/934722 https://doi.org/10.5194/acpd-8-11755-2008 doi:10.5194/acpd-8-11755-2008 |
op_doi |
https://doi.org/10.5194/acpd-8-11755-2008 |
_version_ |
1772811968117211136 |