HCFC-22 is an ozone-depleting substance with a greenhouse effect. The atmospheric mole fractions of HCFC-22 have been increasing since the 1950s. Within the NDACC-IRWG network, HCFC-22 mol fractions can be retrieved from solar absorption spectra measured by ground-based FTIR. However, only a few sites have provided HCFC-22 data sets. Here, we demonstrate a harmonized FTIR HCFC-22 retrieval strategy and generate a new global NDACC-IRWG HCFC-22 data set at 16 FTIR sites. The systematic and random uncertainties are 5.3%–8.7% and 3.2%–8.0%, respectively. A maximum HCFC-22 column annual growth rate was observed in 2009 with a mean of 7.65 ± 1.39 ppt/year, and the HCFC-22 annual growth rate decreased to 3.57 ± 1.39 ppt/year (2016–2020) and 2.15 ± 2.09 ppt/year (2021–2023). The annual growth rates derived from the FTIR measurements are compared to the ones derived from NOAA surface flask samplings and ACE-FTS satellite measurements, and the three independent data sets show a good agreement.

中文翻译：

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最近在 16 个 NDACC 站点的地面 FTIR 协调检索得出的大气 HCFC-22 柱的生长速率降低


HCFC-22 是一种具有温室效应的消耗臭氧层物质。自 1950 年代以来，HCFC-22 的大气摩尔分数一直在增加。在 NDACC-IRWG 网络中，可以从地面 FTIR 测量的太阳吸收光谱中检索 HCFC-22 mol 馏分。然而，只有少数研究中心提供了 HCFC-22 数据集。在这里，我们展示了一种统一的 FTIR HCFC-22 检索策略，并在 16 个 FTIR 站点生成了一个新的全球 NDACC-IRWG HCFC-22 数据集。系统不确定性和随机不确定性分别为 5.3%–8.7% 和 3.2%–8.0%。2009 年观察到 HCFC-22 柱的年增长率最高，平均为 7.65 ± 1.39 ppt/年，HCFC-22 年增长率降至 3.57 ± 1.39 ppt/年（2016-2020 年）和 2.15 ± 2.09 ppt/年（2021-2023 年）。将 FTIR 测量得出的年增长率与 NOAA 表面培养瓶采样和 ACE-FTS 卫星测量得出的年增长率进行了比较，三个独立的数据集显示出良好的一致性。