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contributor authorBonan, Gordon B.
contributor authorPollard, David
contributor authorThompson, Starley L.
date accessioned2017-06-09T15:20:21Z
date available2017-06-09T15:20:21Z
date copyright1993/10/01
date issued1993
identifier issn0894-8755
identifier otherams-4093.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4179434
description abstractThe statistical representation of multiple land surfaces within a grid cell has received attention as a means to parameterize the nonlinear effects of subgrid-scale heterogeneity on land-atmosphere energy exchange. However, previous analyses have not identified the critical land-surface parameters to which energy exchanges are sensitive; the appropriate number of within-grid-cell classes for a particular parameter, or the effects of interactions among several parameters on the nonlinearity of energy exchanges. The analyses reported here used a land-surface scheme for climate models to examine the effects of subgrid variability in leaf area index, minimum and maximum stomatal resistances, and soil moisture on grid-scale fluxes. Comparisons between energy fluxes obtained using parameter values for the average of 100 subgrid points and the average fluxes for the 100 subgrid points showed minor differences for emitted infrared radiation and reflected solar radiation, but large differences for sensible heat and evapotranspiration. Leaf area index was the most important parameter; stomatal resistances were only important on wet soils. Interactions among parameters increased the nonlinearity of land-atmosphere energy exchange. When considered separately, six to ten values of each parameter greatly reduced the deviation between the two flux estimates. However, this approach became cumbersome when all four parameters varied independently. These analyses suggest that the debate over how to best parameterize the nonlinear effects of subgrid-scale heterogeneity on land-atmosphere interactions will continue.
publisherAmerican Meteorological Society
titleInfluence of Subgrid-Scale Heterogeneity in Leaf Area Index, Stomatal Resistance, and Soil Moisture on Grid-Scale Land–Atmosphere Interactions
typeJournal Paper
journal volume6
journal issue10
journal titleJournal of Climate
identifier doi10.1175/1520-0442(1993)006<1882:IOSSHI>2.0.CO;2
journal fristpage1882
journal lastpage1897
treeJournal of Climate:;1993:;volume( 006 ):;issue: 010
contenttypeFulltext


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