Development and testing of an aerosol/stratus cloud parameterization scheme for middle and high latitudes. Year 3 technical progress report, November 1, 1996--August 31, 1997
At the present time, general circulation models (GCMs) poorly represent clouds, to the extent that they cannot be relied upon to simulate the climatic effects of increasing concentrations of greenhouse gases, or of anthropogenic perturbations to concentrations of cloud condensation nuclei (CCN) or i...
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Colorado State University. Department of Atmospheric Science.
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ftunivnotexas:info:ark/67531/metadc690265 2023-05-15T14:56:40+02:00 Development and testing of an aerosol/stratus cloud parameterization scheme for middle and high latitudes. Year 3 technical progress report, November 1, 1996--August 31, 1997 Kreidenweis, S.M. Cotton, W.R. United States. Department of Energy. Office of Energy Research. 1997-09-02 7 p. Text https://doi.org/10.2172/532507 https://digital.library.unt.edu/ark:/67531/metadc690265/ English eng Colorado State University. Department of Atmospheric Science. other: DE97009431 rep-no: DOE/ER/61958--3 grantno: FG03-95ER61958 doi:10.2172/532507 osti: 532507 https://digital.library.unt.edu/ark:/67531/metadc690265/ ark: ark:/67531/metadc690265 Other Information: PBD: 2 Sep 1997 Aerosols Forecasting General Circulation Models Latitude Effect Progress Report Performance Testing Climatic Change 54 Environmental Sciences Physical Properties Arctic Regions Clouds Report 1997 ftunivnotexas https://doi.org/10.2172/532507 2020-08-15T22:08:02Z At the present time, general circulation models (GCMs) poorly represent clouds, to the extent that they cannot be relied upon to simulate the climatic effects of increasing concentrations of greenhouse gases, or of anthropogenic perturbations to concentrations of cloud condensation nuclei (CCN) or ice nuclei (IN). The net radiative forcing of clouds varies strongly with latitude. Poleward of 30 degrees in both hemispheres, low-level clouds create a net cooling effect corresponding to radiative divergences of {minus}50 to {minus}100 W/m{sup 2}. It is likely that a combination of fogs, boundary-layer stratocumulus, and stratus clouds are the main contributors to this forcing. Models of the response of the microphysical and radiative properties of clouds to changes in aerosol abundance, for a variety of large-scale meteorological forcings, are important additions to GCMs used for the study of the role of Arctic systems in global climate. The overall objective of this research is the development of an aerosol/cloud microphysics parameterization of mixed-phase stratus and boundary-layer clouds which responds to variations in CCN and IN. The parameterization is to be designed for ultimate use in GCM simulations as a tool in understanding the role of CCN, IN, and Arctic clouds in radiation budgets. Several versions of the CSU RAMS (Regional Atmospheric Modeling System) will be used during the course of this work. The parameterizations developed in this research are intended for application in a single-column cloud model, designed as an adaptive grid model which can interface into a GCM vertical grid through distinct layers of the troposphere where the presence of layer clouds is expected. Report Arctic University of North Texas: UNT Digital Library Arctic |
institution |
Open Polar |
collection |
University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Aerosols Forecasting General Circulation Models Latitude Effect Progress Report Performance Testing Climatic Change 54 Environmental Sciences Physical Properties Arctic Regions Clouds |
spellingShingle |
Aerosols Forecasting General Circulation Models Latitude Effect Progress Report Performance Testing Climatic Change 54 Environmental Sciences Physical Properties Arctic Regions Clouds Kreidenweis, S.M. Cotton, W.R. Development and testing of an aerosol/stratus cloud parameterization scheme for middle and high latitudes. Year 3 technical progress report, November 1, 1996--August 31, 1997 |
topic_facet |
Aerosols Forecasting General Circulation Models Latitude Effect Progress Report Performance Testing Climatic Change 54 Environmental Sciences Physical Properties Arctic Regions Clouds |
description |
At the present time, general circulation models (GCMs) poorly represent clouds, to the extent that they cannot be relied upon to simulate the climatic effects of increasing concentrations of greenhouse gases, or of anthropogenic perturbations to concentrations of cloud condensation nuclei (CCN) or ice nuclei (IN). The net radiative forcing of clouds varies strongly with latitude. Poleward of 30 degrees in both hemispheres, low-level clouds create a net cooling effect corresponding to radiative divergences of {minus}50 to {minus}100 W/m{sup 2}. It is likely that a combination of fogs, boundary-layer stratocumulus, and stratus clouds are the main contributors to this forcing. Models of the response of the microphysical and radiative properties of clouds to changes in aerosol abundance, for a variety of large-scale meteorological forcings, are important additions to GCMs used for the study of the role of Arctic systems in global climate. The overall objective of this research is the development of an aerosol/cloud microphysics parameterization of mixed-phase stratus and boundary-layer clouds which responds to variations in CCN and IN. The parameterization is to be designed for ultimate use in GCM simulations as a tool in understanding the role of CCN, IN, and Arctic clouds in radiation budgets. Several versions of the CSU RAMS (Regional Atmospheric Modeling System) will be used during the course of this work. The parameterizations developed in this research are intended for application in a single-column cloud model, designed as an adaptive grid model which can interface into a GCM vertical grid through distinct layers of the troposphere where the presence of layer clouds is expected. |
author2 |
United States. Department of Energy. Office of Energy Research. |
format |
Report |
author |
Kreidenweis, S.M. Cotton, W.R. |
author_facet |
Kreidenweis, S.M. Cotton, W.R. |
author_sort |
Kreidenweis, S.M. |
title |
Development and testing of an aerosol/stratus cloud parameterization scheme for middle and high latitudes. Year 3 technical progress report, November 1, 1996--August 31, 1997 |
title_short |
Development and testing of an aerosol/stratus cloud parameterization scheme for middle and high latitudes. Year 3 technical progress report, November 1, 1996--August 31, 1997 |
title_full |
Development and testing of an aerosol/stratus cloud parameterization scheme for middle and high latitudes. Year 3 technical progress report, November 1, 1996--August 31, 1997 |
title_fullStr |
Development and testing of an aerosol/stratus cloud parameterization scheme for middle and high latitudes. Year 3 technical progress report, November 1, 1996--August 31, 1997 |
title_full_unstemmed |
Development and testing of an aerosol/stratus cloud parameterization scheme for middle and high latitudes. Year 3 technical progress report, November 1, 1996--August 31, 1997 |
title_sort |
development and testing of an aerosol/stratus cloud parameterization scheme for middle and high latitudes. year 3 technical progress report, november 1, 1996--august 31, 1997 |
publisher |
Colorado State University. Department of Atmospheric Science. |
publishDate |
1997 |
url |
https://doi.org/10.2172/532507 https://digital.library.unt.edu/ark:/67531/metadc690265/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Other Information: PBD: 2 Sep 1997 |
op_relation |
other: DE97009431 rep-no: DOE/ER/61958--3 grantno: FG03-95ER61958 doi:10.2172/532507 osti: 532507 https://digital.library.unt.edu/ark:/67531/metadc690265/ ark: ark:/67531/metadc690265 |
op_doi |
https://doi.org/10.2172/532507 |
_version_ |
1766328746467393536 |