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Spatial Interpolation of Hourly Air Temperature over Sloping Surfaces Based on a Solar Irradiance Correction  

정유란 (경희대학교 생명자원과학연구원/생태시스템공학과)
윤진일 (경희대학교 생명자원과학연구원/생태시스템공학과)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.4, no.2, 2002 , pp. 95-102 More about this Journal
Abstract
Spatial interpolation has become a common procedure in converting temperature forecasts and observations at irregular points for use in regional scale ecosystem modeling and the model based decision support systems for resource management. Neglection of terrain effects in most spatial interpolations for short term temperatures may cause erroneous results in mountainous regions, where the observation network hardly covers full features of the complicated terrain. A spatial interpolation model for daytime hourly temperature was formulated based on error analysis of unsampled site with respect to the site topography. The model has a solar irradiance correction scheme in addition to the common backbone of the lapse rate - corrected inverse distance weighting. The solar irradiance scheme calculates the direct, diffuse and reflected components of shortwave radiation over any surfaces based on the sun-slope geometry and compares the sum with that over a reference surface. The deviation from the reference radiation is used to calculate the temperature correction term by an empirical conversion formula between the solar energy and the air temperature on any sloped surfaces at an hourly time scale, which can be prepared seasonally for each land cover type. When this model was applied to a 14 km by 22 km mountainous region at a 10 m horizontal resolution, the estimated hourly temperature surfaces showed a better agreement with the observed distribution than those by a conventional method.
Keywords
spatial interpolation, air temperature, topography, mountainous terrain, solar irradiance;
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