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首页> 外文期刊>Atmospheric environment >Characterisation of methane variability and trends from near-infrared solar spectra over Hefei, China
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Characterisation of methane variability and trends from near-infrared solar spectra over Hefei, China

机译：来自合肥市近红外太阳光谱的甲烷变化特征和趋势

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摘要

This study presents the characterization of X-cH4 (averaged-column dry air mole fraction) variability and trends using the near-infrared (NIR) solar spectra recorded by the ground-based high-resolution Fourier transform spectrometer (FTS) over Hefei, China. An annual increase of 10.55 2.87 ppb yr(-1) (0.56 0.15% yr(-1)) in CH4 concentrations was deduced from the three years' worth of FTS measurements. Seasonal cycles and three typical diurnal variation modes were captured. The maximum CH4 concentration occurred in late summer or early autumn, while the minimum CH4 concentration occurred in winter. CH4 concentrations in August were 30-55 ppb higher than those in January. In most cases, the diurnal variability exhibited an increasing trend in summer or early autumn, while it exhibited a decreasing trend or remained relatively constant in other seasons. We compared the FTS data with the GOSAT data and the GEOS-Chem model data. The average difference between the GOSAT and FTS data (GOSAT minus FTS) was 1.60 ppb (0.09%) 13.0 ppb (0.70%), and between the smoothed GEOS-Chem model data and FTS data (GEOS-Chem minus FTS) was -8.09 ppb (0.45%) 17.83 ppb (0.95%). The differences between GOSAT and FTS were season-independent; however, obvious season-dependent differences were observed between GEOS-Chem and FTS. The GOSAT and GEOS-Chem models could reproduce the seasonal cycle observed by FTS with correlation coefficients (r) of 0.77 and 0.86, respectively.
机译：这项研究利用合肥地基高分辨率傅里叶变换光谱仪（FTS）记录的近红外（NIR）太阳光谱展示了X-cH4（平均柱干空气摩尔分数）变异性和趋势的表征。从三年的FTS测量值中得出，CH4浓度每年增加10.55 2.87 ppb yr（-1）（0.56 0.15％yr（-1））。捕获了季节性周期和三种典型的昼夜变化模式。 CH4的最大浓度发生在夏末或初秋，而CH4的最小浓度发生在冬季。 8月的CH4浓度比1月高30-55 ppb。在大多数情况下，日变化在夏季或秋季初表现出增加的趋势，而在其他季节则表现出下降的趋势或保持相对恒定。我们将FTS数据与GOSAT数据和GEOS-Chem模型数据进行了比较。 GOSAT和FTS数据之间的平均差异（GOSAT减去FTS）为1.60 ppb（0.09％）13.0 ppb（0.70％），平滑的GEOS-Chem模型数据和FTS数据之间的平均差异（GEOS-Chem减去FTS）为-8.09 ppb（0.45％）17.83 ppb（0.95％）。 GOSAT和FTS之间的差异与季节无关；但是，GEOS-Chem和FTS之间存在明显的季节依赖性差异。 GOSAT和GEOS-Chem模型可以再现FTS观测到的季节周期，其相关系数（r）分别为0.77和0.86。

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  • 来源
    《Atmospheric environment》 |2018年第1期|198-209|共12页
  • 作者

    Tian Yuan; Sun Youwen; Liu Cheng; Wang Wei; Shan Changgong; Xu Xingwei; Hu Qihou;

  • 作者单位

    Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Anhui, Peoples R China;

    Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Anhui, Peoples R China;

    Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Anhui, Peoples R China;

    Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Anhui, Peoples R China;

    Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Anhui, Peoples R China;

    Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Anhui, Peoples R China;

    Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Anhui, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Fourier transform spectrometer; TCCON; GOSAT; GEOS-Chem; CH4;

    机译：傅里叶变换光谱仪;TCCON;GOSAT;GEOS-Chem;CH4;

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