A Method to Estimate the Hourly Solar Radiation Using AMeDAS Data : Part 2-Application to the Improved Sunshine Recorder of AMeDAS

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  • NIMIYA Hideyo
    Department of Environmental Design, Faculty of Design, Nagaoka Institute of Design
  • MATSUO Yoh
    Department of Architecture, School of Science and Technology, Meiji University
  • AKASAKA Hiroshi
    Department of Architecture, Faculty of Engineering, Kagoshima University
  • SOGA Kazuhiro
    Department of Architecture, Faculty of Engineering, Kagoshima University

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Other Title
  • AMeDASのデータを用いた時刻別日射量の推定法 : 第2報-回転式日照計および改良型太陽電池式日照計への適用
  • AMeDAS ノ データ オ モチイタ ジコクベツ ニッシャリョウ ノ スイテ

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There are approximately 840 AMeDAS (Automated Meteorological Data Acquisition System) stations in Japan, which cover all over the country with the network of 21kilo-meter distance. At every AMeDAS station measurements are undertaken for hourly temperature, the rate of sunshine, precipitation, wind direction and wind velocity. However, no measurements are carried out for solar radiation, humidity and downward atmospheric radiation. In the previous papers, to make AMeDAS data more effective for the application to various simulations, the estimation methods were proposed for hourly data of the three weather elements which are not included in AMeDAS data. In one of the previous papers the good liner correlation was found between measured hourly horizontal global radiation and calculated hourly horizontal extraterrestrial radiation when the rate of sunshine during the identical hour is 1 or 0. On the basis of this correlation, the regression equations for the estimation of hourly solar radiation were derived using the rate of sunshine duration, temperature and precipitation included in AMeDAS data as predictor variables. In the present paper, the proposed equations for the estimation of hourly solar radiation are modified and enhanced. The equations contain several statistical coefficients which can be obtained through identification using observed data. The original sunshine recorder installed at AMeDAS stations had been displaced since 1985 so as to satisfy the WMO (World Meteorological Organization) standard. The threshold of the new recorder is 120W/m^2 of irradiance and smaller than that of the original recorder. Therefore, it is necessary to fit the equations to the new sunshine recorder by re-identifying the coefficients using AMeDAS data measured after 1985. Since the sensitivity of the pyranometer varies among the observation stations and years, it is very important to select the appropriate years and stations for the identification. The selection undertaken in the present paper is more strict than that in the previous paper; the turbidity coefficient is derived using the instantaneous direct solar radiation measured at the 14 stations between 1981 and 1995. By comparing the observed global solar radiation with that calculated from the turbidity coefficient, the appropriate years and stations are selected for the identification. The statistical coefficients in the equations for both the original sunshine recorder and the new recorder are identified. In most cases, the error of the estimation using the new coefficients is within 0.20MJ/(m^2・h).

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