Abstract

Results obtained from ground-based high spectral resolution measurements of solar IR radiation absorption spectra are analyzed. These measurements have been carried out in Peterhof for different ranges of electromagnetic waves to determine the atmospheric total content of СО₂ and its contents in the two atmospheric layers—the troposphere and stratosphere. Two spectral schemes to measure solar spectra within ranges of 2600 and 3100–3300 cm^–1 are chosen based on an analysis of errors in measurements using different spectral schemes and comparisons with independent measurements and simulation data. Time variations in the tropospheric and stratospheric contents of СО₂ for the 2018–2019 period are studied. Within this period, the ХСО₂ values in the troposphere mostly exceed those in the stratosphere, and such an excess reached 5–10 ppm. The reverse situation is observed in summer and early fall, when the ХСО₂ values in the stratosphere exceed those in the troposphere, which is associated with photosynthesis processes (absorption of СО₂ by vegetation in the troposphere). Comparisons of ground-based measurement results with CAMS simulation data and satellite OCO-2 and ACE data show a good agreement for the total content of СО₂ and its tropospheric and stratospheric contents. The errors are within 1% if systematic discrepancies are excluded.

中文翻译：

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使用地基红外光谱方法确定对流层和平流层 СО2 含量

摘要

分析了从地面高光谱分辨率太阳红外辐射吸收光谱测量中获得的结果。这些测量是在 Peterhof 对不同范围的电磁波进行的，以确定 СО ₂的大气总含量及其在两个大气层（对流层和平流层）中的含量。根据使用不同光谱方案的测量误差分析以及与独立测量和模拟数据的比较，选择了两种光谱方案来测量 2600 和 3100–3300 cm ^–1范围内的太阳光谱。研究了 2018-2019 年 СО ₂对流层和平流层含量的时间变化。在此期间，ХСО ₂对流层中的值大多超过平流层中的值，这种超出量达到了 5-10 ppm。在夏季和初秋观察到相反的情况，当平流层中的 ХСО ₂值超过对流层中的值时，这与光合作用过程（对流层中的植被对 СО ₂的吸收）有关。地面测量结果与CAMS模拟数据和卫星OCO-2和ACE数据的比较表明，СО ₂的总含量及其对流层和平流层含量具有良好的一致性。如果排除系统差异，误差在 1% 以内。