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contributor authorAbramopoulos, F.
contributor authorRosenzweig, C.
contributor authorChoudhury, B.
date accessioned2017-06-09T15:08:07Z
date available2017-06-09T15:08:07Z
date copyright1988/09/01
date issued1988
identifier issn0894-8755
identifier otherams-3533.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4173212
description abstractA physically based ground hydrology model is developed to improve the land-surface sensible and latent heat calculations in global climate models (GCMs). The processes of transpiration, evaporation from intercepted precipitation and dew, evaporation from bare soil, infiltration, soil water flow, and runoff are explicitly included in the model. The amount of detail in the hydrologic calculations is restricted to a level appropriate for use in a GCM, but each of the aforementioned processes is modeled on the basis of the underlying physical principles. Data from the Goddard Institute for Space Studies (GISS) GCM are used as inputs for off-line tests of the ground hydrology model in four 8° ? 10° regions (Brazil, Sahel, Sahara, and India). Soil and vegetation input parameters are calculated as area-weighted means over the 8° ? 10° gridhox. This compositing procedure is tested by comparing resulting hydrological quantities to ground hydrology model calculations performed on the 1° ? 1° cells which comprise the 8° ? 10° gridbox. Results show that the compositing procedure works well except in the Sahel where lower soil water levels and a heterogeneous land surface produce more variability in hydrological quantities, indicating that a resolution better than 8° ? 10° is needed for that region. Modeled annual and diurnal hydrological cycles compare well with observations for Brazil, where real world data are available. The sensitivity of the ground hydrology model to several of its input parameters was tested; it was found to be most sensitive to the fraction of land covered by vegetation and least sensitive to the soil hydraulic conductivity and matric potential.
publisherAmerican Meteorological Society
titleImproved Ground Hydrology Calculations for Global Climate Models (GCMs): Soil Water Movement and Evapotranspiration
typeJournal Paper
journal volume1
journal issue9
journal titleJournal of Climate
identifier doi10.1175/1520-0442(1988)001<0921:IGHCFG>2.0.CO;2
journal fristpage921
journal lastpage941
treeJournal of Climate:;1988:;volume( 001 ):;issue: 009
contenttypeFulltext


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