Study on Column Concentration Variations of CO<sub>2</sub> and CH<sub>4</sub> in Dalian Region Based on Portable Fourier Transform Infrared Spectrometer

SHOU Huanhuan; MENG Yuan; HUANG Jun; ZHU Juan; LU Xingji; RU Haodong; CAO Zhengwei; HUANG Yinbo; CAO Zhensong

doi:10.3788/gzxb20265503.0301001

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Study on Column Concentration Variations of CO₂ and CH₄ in Dalian Region Based on Portable Fourier Transform Infrared Spectrometer

Atmospheric and Oceanic Optics | 更新时间：2026-04-21

- Study on Column Concentration Variations of CO₂ and CH₄ in Dalian Region Based on Portable Fourier Transform Infrared Spectrometer
- Acta Photonica Sinica Vol. 55, Issue 3, Pages: 251-262(2026)
- 作者机构：
  
  1.中国科学院合肥物质科学研究院安徽光学精密机械研究所，激光与物质相互作用全国重点
  2.实验室，合肥 230031
  3.中国科学技术大学，合肥 230026
  4.国防科技大学，南湖之光实验室，长沙 410073
  5.航天绵阳室，绵阳 621000
  5.532029部队，天津 310925
- 作者简介：
- 基金信息：
  
  The HFIPS Director's Fund(YZJJ2024QN05)
- DOI：10.3788/gzxb20265503.0301001
  CLC： X831
- CSTR：32255.14.gzxb20265503.0301001
- Received：01 September 2025，
  
  Revised：2026-03-08，
  
  Accepted：09 March 2026，
  
  Published：25 March 2026
- 稿件说明：
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寿欢欢，孟远，黄俊，等. 基于便携式傅里叶变换红外光谱仪研究大连地区CO₂与CH₄柱浓度变化［J］.光子学报，2026，55（3）：0301001

SHOU Huanhuan， MENG Yuan， HUANG Jun， et al. Study on Column Concentration Variations of CO₂ and CH₄ in Dalian Region Based on Portable Fourier Transform Infrared Spectrometer［J］. Acta Photonica Sinica， 2026， 55（3）：0301001
寿欢欢，孟远，黄俊，等. 基于便携式傅里叶变换红外光谱仪研究大连地区CO₂与CH₄柱浓度变化［J］.光子学报，2026，55（3）：0301001 DOI： 10.3788/gzxb20265503.0301001. CSTR： 32255.14.gzxb20265503.0301001.

SHOU Huanhuan， MENG Yuan， HUANG Jun， et al. Study on Column Concentration Variations of CO₂ and CH₄ in Dalian Region Based on Portable Fourier Transform Infrared Spectrometer［J］. Acta Photonica Sinica， 2026， 55（3）：0301001 DOI： 10.3788/gzxb20265503.0301001. CSTR： 32255.14.gzxb20265503.0301001.

摘要

为进一步提高便携式傅里叶变换红外光谱仪EM27/SUN对CO

和CH

的柱浓度反演结果的准确性，利用总碳柱观测网络（TCCON）高分辨率傅里叶变换红外光谱仪同步测量数据，提取CO

和CH

浓度的校准公式，并对EM27/SUN进行校准，优化反演结果。校准后，EM27/SUN的测量反演结果与TCCON站点的数据相比，CO

柱平均干空气摩尔分数（XCO

）日平均偏差由1.838 5 ppm降至1.259 0 ppm；CH

柱平均干空气摩尔分数（XCH

）日平均偏差由0.008 2 ppm降为0.003 7 ppm。在此基础上，在大连长兴岛地区开展了CO

和CH

柱浓度的观测，观测期间XCO

的平均值为（422.41±0.34） ppm，XCH

平均值为（1.915 2±0.001 8） ppm。通过分析观测期间XCO

和XCH

的变化特征，并结合后向轨迹模型，探讨了可能的源汇过程。进一步地，将EM27/SUN观测数据与日本GOSAT卫星测量的数据进行相关性分析，结果显示两者具有较高的一致性，XCO

和XCH

的相关系数分别达到0.87和0.76。

Abstract

Accurate monitoring of atmospheric CO

and CH

column concentrations is crucial for understanding greenhouse gas source-sink processes， assessing the effectiveness of emission reduction measures， and formulating climate change mitigation strategies. Fourier Transform Infrared （FTIR） spectroscopy， known for its high spectral resolution and sensitivity， is a key ground-based remote sensing technique. The portable EM27/SUN FTIR spectrometer， developed by KIT and Bruker， features a compact and robust design suitable for long-term field observations. Its core is an interferometer： incoming solar radiation is split， reflected by fixed and moving mirrors， and recombined to generate interference signals. Subsequently， the PREPROCESS program and the PROFFAST retrieval algorithm are applied to retrieve the column concentrations of the target gases.

To further improve the retrieval accuracy and reliability

of EM27/SUN， this paper evaluates the reliability of the EM27/SUN by comparing its retrieval results in the Hefei area with those from the TCCON high-resolution FTIR spectrometer. Calibration formulas were developed to optimize the EM27/SUN retrieval performance. After calibration， the daily average deviation of the column-averaged dry-air mole fraction of carbon dioxide （XCO

） between the EM27/SUN and TCCON was 1.259 0 ppm， while that of methane （XCH

） was 0.003 7 ppm. Furthermore， the observation precision of XCO

and XCH

was calculated based on continuous observation data from the Dalian observation site during the midday period （11∶00~13∶00） on October 23rd. The observation precision for XCO

was found to be 0.12 ppm， and for XCH

， it was 0.9 ppb， which meets the precision requirements for ground-based remote sensing of greenhouse gas monitoring.

Using the PROFFAST retrieval algorithm， time series of atmospheric XCO

and XCH

were obtained for selected dates in February， March， September， October， and November 2023 in the Dalian Changxing Island region. The mean XCO

was （422.41±0.34） ppm （parts per million by volume）， while the mean XCH

was （1.915 2±0.001 8） ppm. The observational data were divided into two periods： the late winter to early spring transition period （late February to March） and the mid-to-late autumn period （late September to early November）. The mean XCO

during the late winter to early spring period （422.99 ppm） was higher than that during the mid-to-late autumn period （421.55 ppm）. In contrast， XCH

showed an opposite trend， with a lower mean during the late winter to early spring transition period （1.909 9 ppm） compared to the mid-to-late autumn period （1.923 2 ppm）. Although CO

and CH

have different source-sink mechanisms， their concentration variations exhibited certain correlations in specific months， implying common influen

ces on their variations. The correlation coefficient was 0.73 in the late winter to early spring period and 0.69 in the mid-to-late autumn period. By analyzing the characteristics of CO

and CH

concentration variations during the observation period and combining this with a backward trajectory model， possible source-sink processes were investigated.

Furthermore， a comparison was conducted between the EM27/SUN observation data and the corrected data from the Japanese GOSAT satellite. The results showed high consistency， with correlation coefficients of 0.87 for XCO

and 0.76 for XCH

， respectively. Additionally， GOSAT satellite data （monthly averages） from December 2021 to November 2024 were analyzed， revealing distinct seasonal variations for both gases： XCO

peaked in spring and winter and reached its lowest in summer （spring

winter

autumn

summer）， whereas XCH

was lower in spring and higher in summer and autumn （autumn

summer

winter

spring）. Both gases exhibited a clear increasing trend over the years. This study provides important data support for greenhouse gas source-sink analysis in the Dalian region. The portable FTIR spectrometer EM27/SUN can accurately observe atmospheric CO

and CH

column concentrations and their variations， making it suitable for validating satellite remote sensing data in remote areas.

关键词

Keywords

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Study on Column Concentration Variations of CO2 and CH4 in Dalian Region Based on Portable Fourier Transform Infrared Spectrometer

DOI：10.3788/gzxb20265503.0301001

摘要

Abstract

关键词

Keywords

references

Study on Column Concentration Variations of CO₂ and CH₄ in Dalian Region Based on Portable Fourier Transform Infrared Spectrometer