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    A Revised Land Surface Parameterization (SiB2) for GCMS. Part III: The Greening of the Colorado State University General Circulation Model

    Source: Journal of Climate:;1996:;volume( 009 ):;issue: 004::page 738
    Author:
    Randall, D.A.
    ,
    Dazlich, D.A.
    ,
    Zhang, C.
    ,
    Denning, A.S.
    ,
    Sellers, P.J.
    ,
    Tucker, C.J.
    ,
    Bounoua, L.
    ,
    Berry, J.A.
    ,
    Collatz, G.J.
    ,
    Field, C.B.
    ,
    Los, S.O.
    ,
    Justice, C.O.
    ,
    Fung, I.
    DOI: 10.1175/1520-0442(1996)009<0738:ARLSPF>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: SiB2, the second-generation land-surface parameterization developed by Sellers et al., has been incorporated into the Colorado State University general circulation model and tested in multidecade simulation. The control run uses a ?bucket? hydrology but employs the same surface albedo and surface roughness distributions as the SiB2 run. Results show that SiB2 leads to a general warming of the continents, as evidenced in the ground temperature, surface air temperature, and boundary-layer-mean potential temperature. The surface sensible heat flux increases and the latent heat flux decreases. This warming occurs virtually everywhere but is most spectacular over Siberia in winter. Precipitation generally decreases over land but increases in the monsoon regions, especially the Amazon basin in January and equatorial Africa and Southeast Asia in July. Evaporation decreases considerably, especially in dry regions such as the Sahara. The excess of precipitation over evaporation increases in the monsoon regions. The precipitable water (vertically integrated water vapor content) generally decreases over land but increases in the monsoon regions. The mixing ratio of the boundary-layer air decreases over newly all continental areas, however, including the monsoon regions. The average (composite) maximum boundary-layer depth over the diurnal cycle increases in the monsoon regions, as does the average PBL turbulence kinetic energy. The average boundary-layer wind speed also increases over most continental regions. Groundwater content generally increases in rainy regions and decreases in dry regions, so that SiB2 has a tendency to increase its spatial variability. SiB2 leas to a general reduction of cloudiness over land. The net surface longwave cooling of the surface increases quite dramatically over land, in accordance with the increased surface temperatures and decreased cloudiness. The solar radiation absorbed at the ground also increases. SiB2 has modest effects on the simulated general circulation of the atmosphere. Its most important impacts on the model are to improve the simulations of surface temperature and snow cover and to enable the simulation of the net rate of terrestrial carbon assimilation
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      A Revised Land Surface Parameterization (SiB2) for GCMS. Part III: The Greening of the Colorado State University General Circulation Model

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4184212
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    contributor authorRandall, D.A.
    contributor authorDazlich, D.A.
    contributor authorZhang, C.
    contributor authorDenning, A.S.
    contributor authorSellers, P.J.
    contributor authorTucker, C.J.
    contributor authorBounoua, L.
    contributor authorBerry, J.A.
    contributor authorCollatz, G.J.
    contributor authorField, C.B.
    contributor authorLos, S.O.
    contributor authorJustice, C.O.
    contributor authorFung, I.
    date accessioned2017-06-09T15:29:39Z
    date available2017-06-09T15:29:39Z
    date copyright1996/04/01
    date issued1996
    identifier issn0894-8755
    identifier otherams-4523.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4184212
    description abstractSiB2, the second-generation land-surface parameterization developed by Sellers et al., has been incorporated into the Colorado State University general circulation model and tested in multidecade simulation. The control run uses a ?bucket? hydrology but employs the same surface albedo and surface roughness distributions as the SiB2 run. Results show that SiB2 leads to a general warming of the continents, as evidenced in the ground temperature, surface air temperature, and boundary-layer-mean potential temperature. The surface sensible heat flux increases and the latent heat flux decreases. This warming occurs virtually everywhere but is most spectacular over Siberia in winter. Precipitation generally decreases over land but increases in the monsoon regions, especially the Amazon basin in January and equatorial Africa and Southeast Asia in July. Evaporation decreases considerably, especially in dry regions such as the Sahara. The excess of precipitation over evaporation increases in the monsoon regions. The precipitable water (vertically integrated water vapor content) generally decreases over land but increases in the monsoon regions. The mixing ratio of the boundary-layer air decreases over newly all continental areas, however, including the monsoon regions. The average (composite) maximum boundary-layer depth over the diurnal cycle increases in the monsoon regions, as does the average PBL turbulence kinetic energy. The average boundary-layer wind speed also increases over most continental regions. Groundwater content generally increases in rainy regions and decreases in dry regions, so that SiB2 has a tendency to increase its spatial variability. SiB2 leas to a general reduction of cloudiness over land. The net surface longwave cooling of the surface increases quite dramatically over land, in accordance with the increased surface temperatures and decreased cloudiness. The solar radiation absorbed at the ground also increases. SiB2 has modest effects on the simulated general circulation of the atmosphere. Its most important impacts on the model are to improve the simulations of surface temperature and snow cover and to enable the simulation of the net rate of terrestrial carbon assimilation
    publisherAmerican Meteorological Society
    titleA Revised Land Surface Parameterization (SiB2) for GCMS. Part III: The Greening of the Colorado State University General Circulation Model
    typeJournal Paper
    journal volume9
    journal issue4
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(1996)009<0738:ARLSPF>2.0.CO;2
    journal fristpage738
    journal lastpage763
    treeJournal of Climate:;1996:;volume( 009 ):;issue: 004
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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