Publication Abstracts

Randall et al. 1996

Randall, D.A., D.A. Dazlich, C. Zhang, A.S. Denning, P.J. Sellers, C.J. Tucker, L. Bounoua, J.A. Berry, G.J. Collatz, C.B. Field, S.O. Los, C.O. Justice, and I. Fung, 1996: A revised land surface parametrization (SiB2) for GCMs. Part III: The greening of the Colorado State University general circulation model. J. Climate, 9, 738-763, doi:10.1175/1520-0442(1996)009<0738:ARLSPF>2.0.CO;2.

SiB2, the second-generation land-surface parameterization developed by Sellers et al., has been incoporated into the Colorado State University general circulation model and tested in multidecade simulations. The control-run uses a "bucket" hydrology but employs the same surface albedo and surface roughness distribution 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 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 nealy 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 kinteic 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 leads 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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BibTeX Citation

@article{ra07200r,
  author={Randall, D. A. and Dazlich, D. A. and Zhang, C. and Denning, A. S. and Sellers, P. J. and Tucker, C. J. and Bounoua, L. and Berry, J. A. and Collatz, G. J. and Field, C. B. and Los, S. O. and Justice, C. O. and Fung, I.},
  title={A revised land surface parametrization (SiB2) for GCMs. Part III: The greening of the Colorado State University general circulation model},
  year={1996},
  journal={Journal of Climate},
  volume={9},
  pages={738--763},
  doi={10.1175/1520-0442(1996)009%3C0738%3AARLSPF%3E2.0.CO;2},
}

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RIS Citation

TY  - JOUR
ID  - ra07200r
AU  - Randall, D. A.
AU  - Dazlich, D. A.
AU  - Zhang, C.
AU  - Denning, A. S.
AU  - Sellers, P. J.
AU  - Tucker, C. J.
AU  - Bounoua, L.
AU  - Berry, J. A.
AU  - Collatz, G. J.
AU  - Field, C. B.
AU  - Los, S. O.
AU  - Justice, C. O.
AU  - Fung, I.
PY  - 1996
TI  - A revised land surface parametrization (SiB2) for GCMs. Part III: The greening of the Colorado State University general circulation model
JA  - J. Climate
JO  - Journal of Climate
VL  - 9
SP  - 738
EP  - 763
DO  - 10.1175/1520-0442(1996)009%3C0738%3AARLSPF%3E2.0.CO;2
ER  -

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