The mean climate of the Community Atmosphere Model (CAM4) in forced SST and fully coupled experiments
The Community Atmosphere Model, version 4 (CAM4), was released as part of the Community Climate System Model, version 4 (CCSM4). The finite volume (FV) dynamical core is now the default because of its superior transport and conservation properties. Deep convection parameterization changes include a...
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American Meteorological Society
2013
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ftncar:oai:drupal-site.org:articles_13129 2023-09-05T13:17:39+02:00 The mean climate of the Community Atmosphere Model (CAM4) in forced SST and fully coupled experiments Neale, Richard (author) Richter, Jadwiga (author) Park, Sungsu (author) Lauritzen, Peter (author) Vavrus, Stephen (author) Rasch, Philip (author) Zhang, Minghua (author) 2013-07-01 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-020-162 https://doi.org/10.1175/JCLI-D-12-00236.1 en eng American Meteorological Society Journal of Climate http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-020-162 doi:10.1175/JCLI-D-12-00236.1 ark:/85065/d7bv7hkb Copyright 2013 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. Tropics Dynamics Climate models Clouds Convective parameterization Coupled models Text article 2013 ftncar https://doi.org/10.1175/JCLI-D-12-00236.1 2023-08-14T18:38:36Z The Community Atmosphere Model, version 4 (CAM4), was released as part of the Community Climate System Model, version 4 (CCSM4). The finite volume (FV) dynamical core is now the default because of its superior transport and conservation properties. Deep convection parameterization changes include a dilute plume calculation of convective available potential energy (CAPE) and the introduction of convective momentum transport (CMT). An additional cloud fraction calculation is now performed following macrophysical state updates to provide improved thermodynamic consistency. A freeze-drying modification is further made to the cloud fraction calculation in very dry environments (e.g., the Arctic), where cloud fraction and cloud water values were often inconsistent in CAM3. In CAM4 the FV dynamical core further degrades the excessive trade-wind simulation, but reduces zonal stress errors at higher latitudes. Plume dilution alleviates much of the midtropospheric tropical dry biases and reduces the persistent monsoon precipitation biases over the Arabian Peninsula and the southern Indian Ocean. CMT reduces much of the excessive trade-wind biases in eastern ocean basins. CAM4 shows a global reduction in cloud fraction compared to CAM3, primarily as a result of the freeze-drying and improved cloud fraction equilibrium modifications. Regional climate feature improvements include the propagation of stationary waves from the Pacific into midlatitudes and the seasonal frequency of Northern Hemisphere blocking events. A 1° versus 2° horizontal resolution of the FV dynamical core exhibits superior improvements in regional climate features of precipitation and surface stress. Improvements in the fully coupled mean climate between CAM3 and CAM4 are also more substantial than in forced sea surface temperature (SST) simulations. Article in Journal/Newspaper Arctic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Arctic Indian Pacific Journal of Climate 26 14 5150 5168 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
topic |
Tropics Dynamics Climate models Clouds Convective parameterization Coupled models |
spellingShingle |
Tropics Dynamics Climate models Clouds Convective parameterization Coupled models The mean climate of the Community Atmosphere Model (CAM4) in forced SST and fully coupled experiments |
topic_facet |
Tropics Dynamics Climate models Clouds Convective parameterization Coupled models |
description |
The Community Atmosphere Model, version 4 (CAM4), was released as part of the Community Climate System Model, version 4 (CCSM4). The finite volume (FV) dynamical core is now the default because of its superior transport and conservation properties. Deep convection parameterization changes include a dilute plume calculation of convective available potential energy (CAPE) and the introduction of convective momentum transport (CMT). An additional cloud fraction calculation is now performed following macrophysical state updates to provide improved thermodynamic consistency. A freeze-drying modification is further made to the cloud fraction calculation in very dry environments (e.g., the Arctic), where cloud fraction and cloud water values were often inconsistent in CAM3. In CAM4 the FV dynamical core further degrades the excessive trade-wind simulation, but reduces zonal stress errors at higher latitudes. Plume dilution alleviates much of the midtropospheric tropical dry biases and reduces the persistent monsoon precipitation biases over the Arabian Peninsula and the southern Indian Ocean. CMT reduces much of the excessive trade-wind biases in eastern ocean basins. CAM4 shows a global reduction in cloud fraction compared to CAM3, primarily as a result of the freeze-drying and improved cloud fraction equilibrium modifications. Regional climate feature improvements include the propagation of stationary waves from the Pacific into midlatitudes and the seasonal frequency of Northern Hemisphere blocking events. A 1° versus 2° horizontal resolution of the FV dynamical core exhibits superior improvements in regional climate features of precipitation and surface stress. Improvements in the fully coupled mean climate between CAM3 and CAM4 are also more substantial than in forced sea surface temperature (SST) simulations. |
author2 |
Neale, Richard (author) Richter, Jadwiga (author) Park, Sungsu (author) Lauritzen, Peter (author) Vavrus, Stephen (author) Rasch, Philip (author) Zhang, Minghua (author) |
format |
Article in Journal/Newspaper |
title |
The mean climate of the Community Atmosphere Model (CAM4) in forced SST and fully coupled experiments |
title_short |
The mean climate of the Community Atmosphere Model (CAM4) in forced SST and fully coupled experiments |
title_full |
The mean climate of the Community Atmosphere Model (CAM4) in forced SST and fully coupled experiments |
title_fullStr |
The mean climate of the Community Atmosphere Model (CAM4) in forced SST and fully coupled experiments |
title_full_unstemmed |
The mean climate of the Community Atmosphere Model (CAM4) in forced SST and fully coupled experiments |
title_sort |
mean climate of the community atmosphere model (cam4) in forced sst and fully coupled experiments |
publisher |
American Meteorological Society |
publishDate |
2013 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-020-162 https://doi.org/10.1175/JCLI-D-12-00236.1 |
geographic |
Arctic Indian Pacific |
geographic_facet |
Arctic Indian Pacific |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Journal of Climate http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-020-162 doi:10.1175/JCLI-D-12-00236.1 ark:/85065/d7bv7hkb |
op_rights |
Copyright 2013 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. |
op_doi |
https://doi.org/10.1175/JCLI-D-12-00236.1 |
container_title |
Journal of Climate |
container_volume |
26 |
container_issue |
14 |
container_start_page |
5150 |
op_container_end_page |
5168 |
_version_ |
1776198744188911616 |