Ground-based FTIR observation of hydrogen chloride (HCl) over Hefei, China, and comparisons with GEOS-Chem model data and other ground-based FTIR stations data.
Ground-based FTIR observation of hydrogen chloride (HCl) over Hefei, China, and comparisons with GEOS-Chem model data and other ground-based FTIR stations data.
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DOI：
10.1364/oe.384377
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发表时间：
2020-03
期刊：
影响因子：
3.8
通讯作者：
Haoyue Yin;Youwen Sun;Cheng Liu;Xiao Lu;D. Smale;T. Blumenstock;T. Nagahama;Wei Wang;Yuan Tian;Q. Hu;Changgong Shan;Huifang Zhang;Jianguo Liu
中科院分区：
文献类型：
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作者：
Haoyue Yin;Youwen Sun;Cheng Liu;Xiao Lu;D. Smale;T. Blumenstock;T. Nagahama;Wei Wang;Yuan Tian;Q. Hu;Changgong Shan;Huifang Zhang;Jianguo Liu
本文首次研究了合肥地区（117° 10 'E，31° 54' N）氯化氢（HCl）污染的季节变化特征和年际线性趋势。利用2015年7月至2019年4月期间地面高分辨率傅里叶变换红外光谱仪（FTIR）记录的中红外（MIR）太阳光谱反演了HCl的时间序列。HCl的量级在1月达到峰值（2.70 ± 0.16）× 1015 molecules*cm-2，在9月达到最小值（2.27 ± 0.09）× 1015 molecules*cm-2。HCl总量的4年时间序列呈负线性趋势，为（-1.83 ± 0.13）%。FTIR数据与GEOS-Chem数据进行了比较，以评估GEOS-Chem模型模拟HCl的性能。总的来说，总柱FTIR数据和GEOS-Chem模型数据吻合良好，相关系数为0.82。GEOS-Chem模式数据与FTIR数据在季节变化和年际变化趋势上表现出较好的一致性。最大差异出现在1月和4月，平均差异为4%-6%。本文还介绍了不莱梅、多伦多、陆别、伊扎纳、留尼汪、梅多、劳德等6个位于北方、南半球中低纬地区的NDACC站和合肥站观测的HCl时间序列，以研究低中纬地区HCl的季节和年际变化趋势。北方各站的HCl总柱在冬末或早春达到最大值，在初冬或秋末达到最小值。合肥地区HCl的季节变化与北方中纬度FTIR站的季节变化基本一致。
In this study, the characterization of Hydrogen Chloride (HCl) seasonal variations and inter-annual linear trend are presented for the first time over the polluted region at Hefei (117°10'E, 31°54'N), China. The time series of HCl were retrieved by the mid-infrared (MIR) solar spectra recorded by the ground-based high-resolution Fourier transform infrared spectroscopy (FTIR) between July, 2015 and April, 2019. The magnitude of HCl reaches a peak in January (2.70 ± 0.16) × 1015 molecules*cm-2 and a minimum in September (2.27 ± 0.09) × 1015 molecules*cm-2. The four-year time series of HCl total column show a negative linear trend of (-1.83 ± 0.13) %. The FTIR data are compared with GEOS-Chem data in order to evaluate the performance of the GEOS-Chem model to simulate HCl. In general, total column FTIR data and GEOS-Chem model data are in a good agreement with a correlation coefficient of 0.82. GEOS-Chem model data present a good agreement with FTIR data in seasonal variation and inter-annul trend. The maximum differences occur in January and April with mean differences of 4%-6%. We also present HCl time series observed by 6 NDACC stations (Bremen, Toronto, Rikubetsu, Izana, Reunion.maido, Lauder) in low-middle-latitude sites of the northern and southern hemispheres and Hefei stations in order to investigate the seasonal and annual trends of HCl in low-middle-latitude sites. The HCl total column at the northern hemisphere stations reached the maximum in the late winter or early spring and the minimum in the early winter or late autumn. In general, the seasonal variations of HCl over Hefei is similar to that in other northern hemisphere mid-latitude FTIR stations.