Implications for water monomer and dimer solar absorption from observations at Boulder, Colorado
Implications for water monomer and dimer solar absorption from observations at Boulder, Colorado
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科罗拉多州博尔德观测对水单体和二聚体太阳吸收的影响
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
W. Madsen
中科院分区：
文献类型：
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作者：
J. Daniel;S. Solomon;R. Sanders;R. Portmann;D. Miller;W. Madsen
我们提出了基于地面的光谱测量的向下直接和漫射太阳强度之间的624和686 nm。使用上升的太阳作为光源，它表明，水二聚体不吸收显着在这个波长区域。1998年7月10日，在科罗拉多的博尔德上空，在这些波长处二聚体垂直光学厚度的上限约为0.001，对于头顶上的太阳，瞬时晴空吸收太阳辐射的上限约为0.8 W/m 2。太阳直射测量还表明，在所观察到的波长区域中，没有其他未知的结构吸收体可以解释超过0.6 W/m 2的瞬时向下直接太阳通量的吸收。通过厚云散射的光的观测表明，当大气中的水蒸气饱和时，没有可观察到的二聚体吸收发生，并且在我们的光谱分辨率下，水单体吸收没有显着的光谱形状变化。
We present ground-based spectral measurements of downward direct and diffuse solar intensities between 624 and 686 nm. Using the rising Sun as a light source, it is shown that the water dimer does not absorb significantly in this wavelength region. Over Boulder, Colorado, on July 10, 1998, the upper limit to the dimer vertical optical depth at these wavelengths is approximately 0.001, with an implied upper limit for instantaneous clear-sky absorption of solar radiation of about 0.8 W/m 2 for an overhead Sun. The direct Sun measurements also show that in the observed wavelength region no other unknown structured absorber can account for more than 0.6 W/m 2 absorption of the instantaneous downward direct solar flux for an overhead Sun. Observations of light scattered through a thick cloud reveal that when the atmosphere is saturated with respect to water vapor, no observable dimer absorption occurs and there is no significant spectral shape change in water monomer absorption at our spectral resolution.