首页 >  2012, Vol. 16, Issue (5) : 928-938

摘要

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引用本文:

DOI:

10.11834/jrs.20121248

收稿日期:

2011-09-20

修改日期:

2012-03-03

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近红外大气吸收波段太阳辐射计定标
1.中国科学院 安徽光学精密机械研究所 中国科学院大气成分与光学重点实验室,安徽 合肥 230031;2.中国科学院研究生院,北京 100049
摘要:

用通用大气辐射传输软件CART模拟了POM02太阳辐射计的1020 nm、1627 nm和2200 nm等3个近红外通道的大气透过率特性.结果表明,前两通道处于大气非吸收波段,其透过率很好的遵从Beer-Lambert定律,而2200 nm通道则有较强的吸收,吸收光学厚度随大气质量的变化服从指数分布,与Beer-Lambert定律有一定的偏差,其定标需采用改进的Langley法.通过选取好天的5个定标实例证明,采用改进的Langley法定标2200 nm通道,可提高其透过率测量精度约3.8%.

Calibration of near-infrared absorption band for a sun-photometer
Abstract:

The atmospheric transmittance properties for three near-infrared channels of POM02 skyradiometer at the wavelengths of 1020 nm, 1627 nm, and 2200 nm, were studied by using a combined atmospheric radiative transfer model (CART). Results showed that, the extinctions at the bands of 1020 nm, 1627 nm, which are located in atmospheric window channel, obeyed the Beer-Lambert law. For the 2200 nm channel located in an absorption band, the absorption exhibited an exponential distribution. Then these channels of POM02 skyradiometer were calibrated with traditional Langley method and modified Langley method, respectively. Two calibration methods were applied for four clear days. It proved that the accuracy of derived transmittance has been improved by 3.8% using modified Langley method to 2200 nm channel.

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