摘要
本文讨论了太阳辐射对Eppley PIR型大气辐射表的影响,指出不管是在夏季还是冬季,中午前后的太阳直接辐射可使仪器测值偏高10％以上。根据今年多的观测资料,提出了偏高值的气候学估算公式。本文还分析了“粗测法”中电池电压对测量结果的影响,计算了用1.5 V干电池代替1.35 V汞电池造成的测量误差,指出在实际测量中,电池电压和仪器灵敏度经常处于不匹配状态,是粗测法测量误差的重要原因,这种误差与仪器温度有关,故难以进行订正。
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, △L, in pyrgeometer outputs caused by solar heating of the dome can be estimated empirically with the formula, △L = 0.045g, 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.
出处
《高原气象》
CSCD
北大核心
1993年第1期102-110,共9页
Plateau Meteorology
关键词
辐射表
大气辐射
电池
电压
Pyrgeometer
Atmospheric radiation
Error in measurements.
