HR: 1330h
AN: H22B-0930    [PDF]
TI: Tests of scalar heat flux - roughness scale relationships from the SGS-2002 data sets
AU: * Higgins, C W
EM: chad@jhu.edu
AF: Center for Applied and Environmental Fluid Mechanics, Johns Hopkins University, 3400 N. Charles St 313 Ames Hall, Baltimore, MD 21210 United States
AU: Parlange, M B
EM: parlange@jhu.edu
AF: Center for Applied and Environmental Fluid Mechanics, Johns Hopkins University, 3400 N. Charles St 313 Ames Hall, Baltimore, MD 21210 United States
AU: Meneveau, C
EM: chad@jhu.edu
AF: Center for Applied and Environmental Fluid Mechanics, Johns Hopkins University, 3400 N. Charles St 313 Ames Hall, Baltimore, MD 21210 United States
AB: This study addresses relationships between sensible heat flux and dimensionless roughness scale, based on measurements at several time and length scales. The data were obtained in the summer of 2002 over the homogenous flat terrain of the Utah salt flats. The instrumentation consisted of 16 sonic anemometers arranged into a vertical 4 by 4 grid allowing for spatial resolution of 0.5 m. The temporal resolution of the data is 20 Hz. Supporting meteorological measurements including the relative humidity, latent heat flux, net radiation, soil heat flux, and skin surface temperature were also obtained. Using these data we measure the sensible heat flux and compare to predictions from a model by Brutsaert, and from a more recent improvement proposed by Cahill et al. (1997). The variability of contributing meteorological variables such as the Latent heat flux (H),the friction velocity (u*) and the Obukhov length (L) will be characterized as a function of averaging time, as well as spatial filtering scale. Thus the effects of coarse-graining in space and time upon the validity of the various models is ascertained.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0394 Instruments and techniques
DE: 3307 Boundary layer processes
DE: 3322 Land/atmosphere interactions
DE: 3384 Waves and tides
SC: Hydrology [H]
MN: 2003 Fall Meeting