Surface energy budget over the grass and the concrete surface

Temperature change according to the surface characteristics result from thermal and dynamic energy variations which are occurred by organic relation of more detailed components. Micrometeorological energy budget in urban area that have various surface scales and feature will offer significant indicator to urban thermal environment analysis and improvement. We observed meteorological variables on the concrete that have highest share in urban and the grass that represent park area in urban. At the same time, we directly observed energy flux components using atmospheric turbulence observation system in winter season.

Turbulence components and variations of micro meteorological parameters are used to understand atmospheric condition based on Monin-Obukhov similarity theory. With that result, we analyzed variations of surface energy fluxes and analyzed quantitatively characteristics of energy budget change on the concrete and the grass in winter season. Difference of surface characteristics has a discriminative effect on the variations of energy budget. The diurnal and nocturnal atmospheric conditions on the grass were unstable and stable condition, respectively. The atmospheric condition on the concrete was close to stable condition through the daytime, but nocturnal atmospheric condition showed weak unstable condition. As a result of parameterized fluxes, above 50% of diurnal energy budget of the grass was affected by the sensible heat flux, and above 80% of nocturnal energy budget of the concrete was affected by the soil heat flux. The effect on vegetation canopy was very weak in surface energy budget according as diurnal thermal energy transfer on the grass is more active than that on the concrete. Thermal transfer on the concrete was mitigated by surface characteristic during daytime and nighttime. The convective heat flux was mitigated by heat storage being an effect on above 50% of net radiation at daytime. Therefore, we found that the air temperature on the concrete is about 1~2°C less than the grass all days, and this result reflected well the energy budget characteristics according to the surface change. We expect that the results of this study can be used in the estimation and improvement of urban thermal environment in winter season.



Copyright: © Aristotle University of Thessaloniki
Source: 2nd International Conference 2009 (Juni 2009)
Pages: 6
Price: € 5,00
Autor: Kil-Hong Kim
B.H. Kwon

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