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QA/QC of ASCE Std ET datasets <br />Automated Replacement of Missing/Bad Data <br />18 <br />Wind speed adjustment when station over alfalfa: <br />wind(grass) = wind(alfalfa)*1.04+0.13 (Ley et. al. 2013) <br /> <br />Solar Calibration: Script checks solar radiation data against the clear sky <br />envelope (complex method) and may re-calibrate data (Hill and Ley 2002, HIM) <br />o compute 20 largest daily ratios between March 1 and October 31 <br />o any of the 20 ratios that <>1 standard deviation from the mean thrown out <br />o the reciprocal of the mean is considered a calibration coefficient <br />o calibration coefficient is applied when it is more than 3% from unity <br />o if pyranometers are changed mid-season, calibration coefficients considered <br />before and after change with number of ratios prorated based on days in period <br />o calibration coefficients can be automated or hardwired for future use <br />