Validation of H2O continuum absorption models in the wave number range 180-600 cm(-1) with atmospheric emitted spectral radiance measured at the Antarctica Dome-C site.
Validation of H2O continuum absorption models in the wave number range 180-600 cm(-1) with atmospheric emitted spectral radiance measured at the Antarctica Dome-C site.
复制标题
利用在南极洲 Dome-C 站点测量的大气发射光谱辐射率，验证波数范围 180-600 cm(-1) 内的 H2O 连续吸收模型。
作者：
G. Liuzzi;G. Masiello;C. Serio;L. Palchetti;G. Bianchini
这项工作介绍了对 2011 年至 2012 年在南极洲 Dome-C 站点进行的广泛野外活动期间获得的一组 180 至 1100 cm(-1) 光谱范围内的大气发射（向下涌）光谱辐射观测结果的分析结果。这项工作主要集中于在与水蒸气旋转带重叠的光谱范围内检索和验证外部对水蒸气连续吸收的贡献系数。已经通过使用大气和光谱参数的同步物理反演程序来进行反演。我们的分析中使用了白天（夏季）和夜间（冬季）光谱。这组新的远红外范围观测使我们能够将最先进的水蒸气连续吸收模型的验证和验证范围扩大到 180 cm(-1)。结果表明，在350~590 cm(-1)区间内，测量值与模型之间的差异小于10%，而在波数低于350 cm(-1)时，测量值与模型之间的差异稍大。总的来说，我们的研究显示了观察结果和最先进模型之间的良好一致性，并为需要调整吸收线强度提供了证据。最后，发现使用夏季或冬季光谱检索的系数之间存在良好的一致性，这些光谱是在截然不同的气象条件下获得的。
This work presents the results concerning the analysis of a set of atmospheric emitted (down welling) spectral radiance observations in the spectral range 180 to 1100 cm(-1) acquired at the Dome-C site in Antarctica during an extensive field campaign in 2011-2012. The work has been mainly focused on retrieving and validating the coefficients of the foreign contribution to the water vapour continuum absorption, within a spectral range overlapping the water vapour rotational band. Retrievals have been performed by using a simultaneous physical retrieval procedure for atmospheric and spectroscopic parameters. Both day (summer) and night (winter) spectra have been used in our analysis. This new set of observations in the far infrared range has allowed us to extend validation and verification of state-of-art water vapour continuum absorption models down to 180 cm(-1). Results show that discrepancies between measurements and models are less than 10% in the interval 350-590 cm(-1), while they are slightly larger at wave numbers below 350 cm(-1). On overall, our study shows a good consistency between observations and state-of-art models and provides evidence toward needing to adjust absorptive line strengths. Finally, it has been found that there is a good agreement between the coefficients retrieved using either summer or winter spectra, which are acquired in far different meteorological conditions.