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- W2387134497 abstract "Thermal offset of Eppley Precision Spectral Pyranometer(PSP) and its associated factors were presented on the basis of solar radiation observation made at Shang Dianzi,a regional GAW site near Beijing,during July,2004～May, 2006.PSP error in global radiation measurements and the associated factors were also analyzed,regarding as the‘standard' global radiation which is sum of scattered and directed radiations respectively collected by Epply 848 pyranometer and Normal Incidence Pyrheliometer(NIP).The results showed that probability distributions of PSP thermal offset tends normal distribution mode and the average thermal offset is -8.8±2.7W·m~(-2).The net infrared long-wave radiation, wind speed,relative humidity and temperature near the surface level have significant influences on the PSP thermal offset, especially wind speed and relative humidity.Compared with the‘standard'of global radiation,the average PSP error in global radiation measurement is around -20.0 W·m~(-2)/-11.0W·m~(2) without /with the compensation of thermal offset.The probability distribution of PSP error in global radiation measurement also tends normal distribution with the distinguishable difference in clear and cloudy days.Obvious correlations between relative PSP error in global radiation measurement and solar zenith angle as well as cloud amounts,reflect that of the cosine effect of pyranometer.Accuracy of PSP global radiation data were also influenced by ratio of directed in global radiation which may be caused by cloud amounts.It is suggested that global radiation data collected by pyranometer should be corrected by thermal offset and the calibration for pyranometers in cloudy days." @default.
- W2387134497 created "2016-06-24" @default.
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- W2387134497 date "2009-01-01" @default.
- W2387134497 modified "2023-09-27" @default.
- W2387134497 title "CHARACTERISTICS OF THERMAL OFFSET OF A PRECISION SPECTRAL PYRANOMETER(PSP) AND ITS ERROR IN GLOBAL SOLAR RADIATION MEASUREMENT" @default.
- W2387134497 hasPublicationYear "2009" @default.
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