Surface and Mixed-Layer Variance Methods to Estimate Regional Sensible Heat Flux at the Surface |
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| Authors: | Michiaki Sugita Noriaki Kawakubo |
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| Institution: | (1) University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan;(2) College of Natural Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan;(3) Isohara High School, Kitaibaraki, Ibaraki, 319-1541, Japan |
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| Abstract: | Turbulence measurements in the lower half of the convective boundary layer (CBL), which includes both mixed layer and surface layer, were carried out with five sonic anemometers mounted on a 213-m tower over a complex flat suburban area with patches of forest, agricultural land, houses and buildings. Also made were radiosoundings of temperature, humidity and wind speed, to determine the CBL height. The sonic anemometer data of wind speed and temperature were processed to derive the second-moment turbulent statistics and were analyzed to investigate the applicability of variance methods to estimate regional surface fluxes of sensible heat. It was found that the temperature variances in the lower mixed layer, coupled with universal functions, produced sensible heat fluxes H over the area with an rms error of the order of 40 Wm-2 when compared with H values derived from the eddy correlation method. The variance of the vertical wind speed did not produce as good a result. In contrast, the surface-layer temperature variances yielded H values with rms error of the order of 20 Wm-2, even though the underlying surface was non-uniform and highly non-isothermal, above which enhanced temperature variances could be suspected. |
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| Keywords: | Mixed layer Surface layer Surface fluxes Variance methods |
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