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http://dx.doi.org/10.14249/eia.2012.21.2.239

Parameters Estimation in Longwave Radiation Formula  

Cho, Hongyeon (Marine Environment & Conservation Research Department, Korea Ocean R&D Institute)
Lee, Khil-Ha (Department of Civil Engineering, Daegu University)
Lee, Jungmi (Korea Global Atmosphere Watch Center (KGAWC), KMA)
Publication Information
Journal of Environmental Impact Assessment / v.21, no.2, 2012 , pp. 239-246 More about this Journal
Abstract
Daily net radiation is essential for heat budget analysis for environmental impact assessment in the coastal zone and longwave radiation is an important element of net radiation because there is a significant exchange of radiant energy between the earth's surface and the atmosphere in the form of radiation at longer wavelengths. However, radiation data is not commonly available, and there has been no direct measurement for most areas where coastal environmental impact assessment is usually most needed. Often an empirical equation, e.g., Penman and FAO-24 formulae is used to estimate longwave radiation using temperature, humidity, and sunshine hour data but local calibration may be needed. In this study, local recalibration was performed to have best fit from a widely used longwave equation using the measured longwave radiation data in Korea Global Atmospheric Watch Center (KGAWC). The results shows recalibration can provided better performance AE=0.23($W/m^2$) and RMSE=14.73($W/m^2$). This study will contribute to improve the accuracy of the heat budget analysis in the coastal area.
Keywords
Longwave radiation; heat-budget analysis; calibration; Penman and FAO-24 formulae; net radiation;
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