The λ = 2.06 µm absorption band of CO₂ is widely used for the remote sensing of atmospheric carbon dioxide, making it relevant to many important top-down measurements of carbon flux. The forward models used in the retrieval algorithms employed in these measurements require increasingly accurate line intensity and line shape data from which absorption cross-sections can be computed. To overcome accuracy limitations of existing line lists, we used frequency-stabilized cavity ring-down spectroscopy to measure 39 transitions in the ¹²C¹⁶O₂ absorption band. The line intensities were measured with an estimated relative combined standard uncertainty of u_r = 0.08 %. We predicted the J-dependence of the measured intensities using two theoretical models: a one-dimensional spectroscopic model with Herman-Wallis rotation-vibration corrections, and a line-by-line ab initio dipole moment surface model [Zak et al. JQSRT 2016;177:31-42]. For the second approach, we fit only a single factor to rescale the theoretical integrated band intensity to be consistent with the measured intensities. We find that the latter approach yields an equally adequate representation of the fitted J-dependent intensity data and provides the most physically general representation of the results. Our recommended value for the integrated band intensity equal to 7.183 × 10⁻²¹ cm molecule⁻¹ ± 6 × 10⁻²⁴ cm molecule⁻¹ is based on the rescaled ab initio model and corresponds to a fitted scale factor of 1.0069 ± 0.0002. Comparisons of literature intensity values to our results reveal systematic deviations ranging from −1.16 % to +0.33 %.

CO ₂的λ= 2.06 µm吸收带被广泛用于大气二氧化碳的遥感，使其与许多重要的自上而下的碳通量测量有关。在这些测量中使用的检索算法中使用的正向模型需要越来越精确的线强度和线形数据，可以从中计算吸收截面。为了克服现有线列表的精度限制，我们使用了频率稳定的腔衰荡光谱技术来测量¹² C ¹⁶ O ₂吸收带中的39个跃迁。线强度用的估计相对合成标准不确定度测量的Ù _{- [R}  = 0.08％。我们预测Ĵ-使用两个理论模型对测量强度的依赖性：具有Herman-Wallis旋转振动校正的一维光谱模型和逐行从头算起的偶极矩表面模型[Zak等。JQSRT 2016; 177：31-42]。对于第二种方法，我们仅拟合一个因子来重新调整理论积分带强度，使其与测得的强度一致。我们发现，后一种方法可以得出拟合的J依赖强度数据的等效表示，并提供结果的最物理通用表示。我们建议的积分带强度值等于7.183×10 ⁻²¹  cm分子^-1 ±6×10 ⁻²⁴  cm分子^-1基于重新缩放的从头算模型，并且对应于1.0069±0.0002的拟合比例因子。将文献强度值与我们的结果进行比较，发现系统偏差为-1.16％至+0.33％。