The Community Climate System Model, version 4
The fourth version of the Community Climate System Model (CCSM4) was recently completed and released to the climate community. This paper describes developments to all CCSM components, and documents fully coupled pre-industrial control runs compared to the previous version, CCSM3. Using the standard...
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Online Access: | http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-002-075 https://doi.org/10.1175/2011JCLI4083.1 |
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ftncar:oai:drupal-site.org:articles_18156 2023-09-05T13:17:05+02:00 The Community Climate System Model, version 4 Gent, Peter (author) Danabasoglu, Gokhan (author) Donner, Leo (author) Holland, Marika (author) Hunke, Elizabeth (author) Jayne, Steve (author) Lawrence, David (author) Neale, Richard (author) Rasch, Philip (author) Vertenstein, Mariana (author) Worley, Patrick (author) Yang, Zong-Liang (author) Zhang, Minghua (author) 2011-10-01 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-002-075 https://doi.org/10.1175/2011JCLI4083.1 en eng American Meteorological Society Journal of Climate articles:18156 ark:/85065/d7b859n4 http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-002-075 doi:10.1175/2011JCLI4083.1 Copyright 2011 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. Text article 2011 ftncar https://doi.org/10.1175/2011JCLI4083.1 2023-08-14T18:46:54Z The fourth version of the Community Climate System Model (CCSM4) was recently completed and released to the climate community. This paper describes developments to all CCSM components, and documents fully coupled pre-industrial control runs compared to the previous version, CCSM3. Using the standard atmosphere and land resolution of 1° results in the sea surface temperature biases in the major upwelling regions being comparable to the 1.4° resolution CCSM3. Two changes to the deep convection scheme in the atmosphere component result in CCSM4 producing El Nino/Southern Oscillation variability with a much more realistic frequency distribution than CCSM3, although the amplitude is too large compared to observations. They also improve the Madden-Julian Oscillation, and the frequency distribution of tropical precipitation. A new overflow parameterization in the ocean component leads to an improved simulation of the Gulf Stream path and the North Atlantic Ocean meridional overturning circulation. Changes to CCSM4 land component lead to a much improved annual cycle of water storage, especially in the tropics. The CCSM4 sea ice component uses much more realistic albedos than CCSM3, and for several reasons the Arctic sea ice concentration is improved in CCSM4. An ensemble of 20th century simulations produces a pretty good match to the observed September Arctic sea ice extent from 1979 to 2005. The CCSM4 ensemble mean increase in globally-averaged surface temperature between 1850 and 2005 is larger than the observed increase by about 0.4°C. This is consistent with the fact that CCSM4 does not include a representation of the indirect effects of aerosols, although other factors may come into play. The CCSM4 still has significant biases, such as the mean precipitation distribution in the tropical Pacific Ocean, too much low cloud in the Arctic, and the latitudinal distributions of short-wave and long-wave cloud forcings. Article in Journal/Newspaper Arctic North Atlantic Sea ice OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Arctic Pacific Journal of Climate 24 19 4973 4991 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
The fourth version of the Community Climate System Model (CCSM4) was recently completed and released to the climate community. This paper describes developments to all CCSM components, and documents fully coupled pre-industrial control runs compared to the previous version, CCSM3. Using the standard atmosphere and land resolution of 1° results in the sea surface temperature biases in the major upwelling regions being comparable to the 1.4° resolution CCSM3. Two changes to the deep convection scheme in the atmosphere component result in CCSM4 producing El Nino/Southern Oscillation variability with a much more realistic frequency distribution than CCSM3, although the amplitude is too large compared to observations. They also improve the Madden-Julian Oscillation, and the frequency distribution of tropical precipitation. A new overflow parameterization in the ocean component leads to an improved simulation of the Gulf Stream path and the North Atlantic Ocean meridional overturning circulation. Changes to CCSM4 land component lead to a much improved annual cycle of water storage, especially in the tropics. The CCSM4 sea ice component uses much more realistic albedos than CCSM3, and for several reasons the Arctic sea ice concentration is improved in CCSM4. An ensemble of 20th century simulations produces a pretty good match to the observed September Arctic sea ice extent from 1979 to 2005. The CCSM4 ensemble mean increase in globally-averaged surface temperature between 1850 and 2005 is larger than the observed increase by about 0.4°C. This is consistent with the fact that CCSM4 does not include a representation of the indirect effects of aerosols, although other factors may come into play. The CCSM4 still has significant biases, such as the mean precipitation distribution in the tropical Pacific Ocean, too much low cloud in the Arctic, and the latitudinal distributions of short-wave and long-wave cloud forcings. |
author2 |
Gent, Peter (author) Danabasoglu, Gokhan (author) Donner, Leo (author) Holland, Marika (author) Hunke, Elizabeth (author) Jayne, Steve (author) Lawrence, David (author) Neale, Richard (author) Rasch, Philip (author) Vertenstein, Mariana (author) Worley, Patrick (author) Yang, Zong-Liang (author) Zhang, Minghua (author) |
format |
Article in Journal/Newspaper |
title |
The Community Climate System Model, version 4 |
spellingShingle |
The Community Climate System Model, version 4 |
title_short |
The Community Climate System Model, version 4 |
title_full |
The Community Climate System Model, version 4 |
title_fullStr |
The Community Climate System Model, version 4 |
title_full_unstemmed |
The Community Climate System Model, version 4 |
title_sort |
community climate system model, version 4 |
publisher |
American Meteorological Society |
publishDate |
2011 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-002-075 https://doi.org/10.1175/2011JCLI4083.1 |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Arctic North Atlantic Sea ice |
genre_facet |
Arctic North Atlantic Sea ice |
op_relation |
Journal of Climate articles:18156 ark:/85065/d7b859n4 http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-002-075 doi:10.1175/2011JCLI4083.1 |
op_rights |
Copyright 2011 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/10.1175/2011JCLI4083.1 |
container_title |
Journal of Climate |
container_volume |
24 |
container_issue |
19 |
container_start_page |
4973 |
op_container_end_page |
4991 |
_version_ |
1776198397844258816 |