Dry Air-Surface Exchange in Hilly Terrain

Conference · Mon Jul 15 04:00:00 EDT 1991

OSTI ID:5729382

Gao, W. ^[1]; Wesely, M. L. ^[1]; Cook, D. R. ^[1]; Hart, R. L. ^[1]

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1. Argonne National Laboratory (ANL), Argonne, IL (United States)

Surface fluxes of sensible heat, water vapor, carbon dioxide, ozone, and momentum were measured by using the eddy correlation method near the top of a small hill within the Konza Prairie in Kansas during the four 1987 Intensive Field Campaigns of the First ISLSCP Field Experiment (FIFE). Parameterizations of dry air-surface exchange in nonuniform terrain were examined. Larger drag coefficients, larger surface roughness lengths, and smaller aerodynamic resistances appeared to be associated with the deeper, rolling terrain upwind. Surface resistances were less affected by terrain inhomogeneities but were closely related to levels of photosynthetically active radiation. Normalized standard deviations of temperature, humidity, and vertical velocity are slightly different from values predicted by similarity relationships for uniform surfaces. The influences of these differences on fluxes estimated by use of a variance technique are relatively small as compared to the data scatter; computed variance fluxes are statistically in good agreement with eddy correlation fluxes.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Biological and Environmental Research (BER); National Aeronautics and Space Administration (NASA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5729382
• Report Number(s): ANL/CP--72979; CONF-9107104--3; ON: DE91012479
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540110*
AERODYNAMICS
AIR
AIR FLOW
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DRAG
FEDERAL REGION VII
FLUID FLOW
FLUID MECHANICS
FLUIDS
GAS FLOW
GASES
HUMIDITY
KANSAS
MATHEMATICAL MODELS
MECHANICS
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
RADIATIONS
ROUGHNESS
SOLAR RADIATION
STELLAR RADIATION
SURFACE AIR
SURFACE PROPERTIES
SYNTHESIS
TEMPERATURE DEPENDENCE
TOPOGRAPHY
TURBULENCE
USA
VELOCITY
WIND