Recent Decreases in the Growth Rate of Atmospheric HCFC-22 Column Derived From the Ground-Based FTIR Harmonized Retrievals at 16 NDACC Sites

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2024-11-14 DOI:10.1029/2024GL112470

Minqiang Zhou, Bavo Langerock, Corinne Vigouroux, Dan Smale, Geoff Toon, Alexander Polyakov, James W. Hannigan, Johan Mellqvist, John Robinson, Justus Notholt, Kimberly Strong, Emmanuel Mahieu, Mathias Palm, Maxime Prignon, Nicolas Jones, Omaira García, Isamu Morino, Isao Murata, Ivan Ortega, Tomoo Nagahama, Tyler Wizenberg, Victoria Flood, Kaley Walker, Martine De Mazière

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Abstract

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.

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从 16 个 NDACC 站点的地基傅立叶变换红外统一检索得出的大气 HCFC-22 柱增长率的近期下降情况

HCFC-22 是一种具有温室效应的臭氧消耗物质。自 20 世纪 50 年代以来，HCFC-22 在大气中的摩尔分数一直在增加。在 NDACC-IRWG 网络内，可以通过地面傅立叶变换红外光谱测量的太阳吸收光谱来检索 HCFC-22 摩尔分数。然而，只有少数站点提供了 HCFC-22 数据集。在此，我们展示了一种统一的傅立叶变换红外光谱 HCFC-22 检索策略，并在 16 个傅立叶变换红外光谱站点生成了新的全球 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 年观测到最大 HCFC-22 柱年生长率，平均值为 7.65 ± 1.39 ppt/年，HCFC-22 年生长率降至 3.57 ± 1.39 ppt/年（2016-2020 年）和 2.15 ± 2.09 ppt/年（2021-2023 年）。傅立叶变换红外光谱测量得出的年增长率与 NOAA 表面烧瓶采样和 ACE-FTS 卫星测量得出的年增长率进行了比较，三组独立数据显示出良好的一致性。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.