Broadband water vapor absorption of solar radiation tested using ARM data
Broadband water vapor absorption of solar radiation tested using ARM data
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DOI：
10.1029/98gl00846
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发表时间：
1998-04
影响因子：
5.2
通讯作者：
Q. Fu;G. Lesins;J. Higgins;T. Charlock;P. Chylek;J. Michalsky
中科院分区：
文献类型：
--
作者：
Q. Fu;G. Lesins;J. Higgins;T. Charlock;P. Chylek;J. Michalsky
分析了ARM SGP中心设施收集的高质量数据集，以识别与水汽有关的太阳辐射异常吸收。我们主要研究了1994年4月CAGEX和1996年夏季无云条件下的太阳直接宽带表面辐照度。不考虑太阳光谱中H2O连续体的辐射模型与观测值进行了比较。这一比较揭示了4.5W m−2的平均偏置，大致相当于∼2 W m−2的全球平均偏置。因此，最近研究提出的过量吸收不太可能归因于H2O连续体。我们还表明，辐照度的计算值和观测值之间的差异与水汽的相关性很弱。结果表明，模式与观测值之间的差异很大程度上是由于与气溶胶光学性质有关的不确定性造成的。
A high quality data set collected at the ARM SGP central facility is analyzed to identify the water vapor‐related anomalous absorption of solar radiation. We focus on the direct solar broadband surface irradiances under cloud‐free conditions in the April 1994 CAGEX and summer 1996 periods. A radiation model without including the H2O continuum in the solar spectrum is compared with observations. This comparison reveals a mean bias of 4.5 W m−2 that is roughly equivalent to a globally averaged bias of ∼2 W m−2. It is therefore unlikely that the excess absorption suggested by recent studies can be attributed to the H2O continuum. We also show that the difference between calculated and observed irradiances has a very weak correlation with water vapor. It is suggested that the discrepancy between model and observations is largely due to the uncertainties associated with aerosol optical properties.