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PLATEAU METEOROLOGY  1993, Vol. 12 Issue (1): 102-110    DOI:
    
EFFECTS OF SOLAR RADIATION AND CELL VOLTAGE ON PYRGEOMETER PERFORMANCE
Zhou Yunhua, Xiang Yueqin
Institute of Geography, Chinese Academy of Sciences, Beijing 100101
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Abstract  The effect of solar radiation and cell voltage uncertainties on Eppley Pyrgeometer performance is observed and discussed.(1) By means of exposing and shading the dome from the sun alternatively the effect of solar heating the KRS-5 dome is showed.During the period of noon on clear sky output of the pyrgeometer as the dome exposed is over 10% higher than the values as the dome shaded.The increase,ΔL,in pyrgeometer outputs caused by solar heating of the dome can be estimated empirically with the formula,ΔL=0.045Q,Q is solar radiation.This formula can be used to correct the output of pyrgeometer to obtain the atmospheric radiation.(2) The effect of battery voltage uncertainty on output of pyrgeometer is studied.The error caused using of 1.5V battery instead of 1.35 V mercury cell is calculated.This error is not only dependent on the battery voltage but also the thermopile cold junction temperatures.So it can not be corrected.(3) For the deterioration of KRS-5 dome the instrument sensitivity is not often matched with the battery voltage.This is a main source caused the error in measurements.
Key words:  Pyrgeometer      Atmospheric radiation      Error in measurements     
Received:  07 April 1992      Published:  24 March 1993
Articles by authors
Zhou Yunhua
Xiang Yueqin

Cite this article: 

Zhou Yunhua, Xiang Yueqin. EFFECTS OF SOLAR RADIATION AND CELL VOLTAGE ON PYRGEOMETER PERFORMANCE. PLATEAU METEOROLOGY, 1993, 12(1): 102-110.

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http://www.gyqx.ac.cn/EN/     OR     http://www.gyqx.ac.cn/EN/Y1993/V12/I1/102

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