A high-resolution near-infrared extraterrestrial solar spectrum derived from ground-based Fourier transform spectrometer measurements
A high-resolution near-infrared extraterrestrial solar spectrum derived from ground-based Fourier transform spectrometer measurements
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来自地面傅里叶变换光谱仪测量的高分辨率近红外地外太阳光谱
DOI：
10.1002/jgrd.50425
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Menang K
中科院分区：
文献类型：
--
作者：
Menang K
详细的光谱分辨地外太阳光谱(ESS)对于近红外逐线辐射传输模拟是非常重要的。在这个光谱区域，很少有基于观测的高分辨率ESS可用。因此，Kurucz的理论计算ESS被广泛采用。我们介绍了CAVIAR(可见光和红外波长的连续吸收及其大气相关性)，它是利用兰利技术推导出来的，用于在2000年至10,000 cm-1(1-5 µm)的大气窗口内使用地面高分辨率傅里叶变换光谱仪进行校准观测。鱼子酱和卫星大气化学实验-FTS ESS之间的太阳线强度和位置在它们重叠的光谱区域之间有很好的一致，并在两个近红外窗口与其他地面FTS测量结果很好地吻合。然而，鱼子酱ESS的结构与半经验模型的光谱有显著的差异。此外，我们发现鱼子酱ESS和Thuillier等人的绝对辐照度差异高达8%，这是基于大气应用实验室和科学卫星和其他来源的测量得出的。在许多光谱区域中，这种差异是显著的，因为两组观测中的覆盖因子k= 2(或95%置信限)的不确定性不重叠。由于太阳总辐照度受到相对较好的限制，如果鱼子酱ESS是正确的，那么这将表明在近红外波段太阳辐照度的综合“损失”约为30W m-2，这将不得不通过增加其他波长的辐射来补偿。
A detailed spectrally resolved extraterrestrial solar spectrum (ESS) is important for line‐by‐line radiative transfer modeling in the near‐IR. Very few observationally based high‐resolution ESS are available in this spectral region. Consequently, the theoretically calculated ESS by Kurucz has been widely adopted. We present the CAVIAR (Continuum Absorption at Visible and Infrared Wavelengths and its Atmospheric Relevance) ESS, which is derived using the Langley technique applied to calibrated observations using a ground‐based high‐resolution Fourier transform spectrometer (FTS) in atmospheric windows from 2000 to 10,000 cm–1(1–5 µm). There is good agreement between the strengths and positions of solar lines between the CAVIAR and the satellite‐based Atmospheric Chemistry Experiment‐FTS ESS, in the spectral region where they overlap, and good agreement with other ground‐based FTS measurements in two near‐IR windows. However, there are significant differences in the structure between the CAVIAR ESS and spectra from semiempirical models. In addition, we found a difference of up to 8% in the absolute (and hence the wavelength‐integrated) irradiance between the CAVIAR ESS and that of Thuillier et al., which was based on measurements from the Atmospheric Laboratory for Applications and Science satellite and other sources. In many spectral regions, this difference is significant, because the coverage factork= 2 (or 95% confidence limit) uncertainties in the two sets of observations do not overlap. Because the total solar irradiance is relatively well constrained, if the CAVIAR ESS is correct, then this would indicate an integrated “loss” of solar irradiance of about 30 W m–2in the near‐IR that would have to be compensated by an increase at other wavelengths.