New ground-based Fourier-transform near-infrared solar absorption measurements of XCO2, XCH4 and XCO at Xianghe, China
New ground-based Fourier-transform near-infrared solar absorption measurements of XCO2, XCH4 and XCO at Xianghe, China
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DOI：
10.5194/essd-12-1679-2020
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发表时间：
2020-07
影响因子：
11.4
通讯作者：
Yang Yang-Yang;Minqiang Zhou;B. Langerock;M. Sha;C. Hermans;Ting Wang;Denghui Ji;C. Vigouroux;N. Kumps;Geng-chen Wang;M. D. De Mazière;Pucai C. Wang
中科院分区：
文献类型：
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作者：
Yang Yang-Yang;Minqiang Zhou;B. Langerock;M. Sha;C. Hermans;Ting Wang;Denghui Ji;C. Vigouroux;N. Kumps;Geng-chen Wang;M. D. De Mazière;Pucai C. Wang
抽象的。自2018年6月以来，使用布鲁克IFS 125 HR傅里叶变换红外（FTIR）光谱仪在香河（39.75 ° N，116.96 ° E，中国北方）测量了CO2（XCO2），CH4（XCH4）和CO（XCO）的柱平均干空气摩尔分数。本文介绍了傅里叶变换红外光谱仪的现场、特点和测量方法。仪器设置遵循总碳柱观测网络（TCCON）的指导方针：近红外光谱由InGaAs探测器和CaF2分束器记录，定期记录HCl电池测量值以获得仪器线形（ILS），表明仪器正确对齐。采用TCCON标准检索码（GGG 2014）检索XCO 2、XCH 4和XCO。给出了2018年6月至2019年7月的时间序列，并讨论了香河XCO 2，XCH 4和XCO的季节周期和逐日变化。此外，本文还将香河红外光谱数据与OCO-2卫星和TROPOMI卫星的观测数据进行了比较。比较结果似乎与TCCON站点获得的XCO 2和XCH 4的验证结果一致，而对于XCO，它们突出了频繁的高污染事件的发生。香河地处我国北方重金属污染区，目前还没有TCCON观测站，该观测站可以填补该地区TCCON观测的空白，扩大TCCON观测的全球覆盖范围。Xianghe FTIR XCO 2、XCH 4和XCO数据可以在www.example.com获得（Yang et al.，2019年）。
Abstract. The column-averaged dry-air mole fractions of CO2 (XCO2), CH4 (XCH4) and CO (XCO) have been measured with a Bruker IFS 125HR Fourier-transform infrared (FTIR) spectrometer at Xianghe (39.75∘ N, 116.96∘ E, north China) since June 2018. This paper presents the site, the characteristics of the FTIR system and the measurements. The instrumental setup follows the guidelines of the Total Carbon Column Observing Network (TCCON): the near-infrared spectra are recorded by an InGaAs detector together with a CaF2 beam splitter, and the HCl cell measurements are recorded regularly to derive the instrument line shape (ILS) showing that the instrument is correctly aligned. The TCCON standard retrieval code (GGG2014) is applied to retrieve XCO2, XCH4 and XCO. The resulting time series between June 2018 and July 2019 are presented, and the observed seasonal cycles and day-to-day variations in XCO2, XCH4 and XCO at Xianghe are discussed. In addition, the paper shows comparisons between the data products retrieved from the FTIR measurements at Xianghe and co-located Orbiting Carbon Observatory-2 (OCO-2) and Tropospheric Monitoring Instrument (TROPOMI) satellite observations. The comparison results appear consistent with validation results obtained at TCCON sites for XCO2 and XCH4, while for XCO they highlight the occurrence of frequent high-pollution events. As Xianghe lies in a polluted area in north China where there are currently no TCCON sites, this site can fill the TCCON gap in this region and expand the global coverage of the TCCON measurements. The Xianghe FTIR XCO2, XCH4 and XCO data can be obtained at https://doi.org/10.18758/71021049 (Yang et al., 2019).