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全文摘要次数: 260 全文下载次数: 73
引用本文:

DOI:

10.11834/jrs.20243296

收稿日期:

2023-07-11

修改日期:

2023-10-20

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碳柱观测合作网络(COCCON)甲烷监测进展及其在我国的初步应用
涂倩思1, 秦凯2, 鹿凡2,2
1.同济大学 机械与能源工程学院;2.中国矿业大学 环境与测绘学院
摘要:

地基遥感技术是监测大气温室气体柱浓度、校准卫星和研究碳源汇的有效手段。基于便携式傅立叶光谱仪EM27/SUN的碳柱观测合作网络(COCCON)可以作为全球碳柱总量观测网(TCCON)的有效补充。本文介绍了COCCON仪器线型函数ILS与开放路径测量方法、高精度反演算法PROFFAST,展现了仪器的高稳定性和反演结果的较低的不确定性,梳理总结了COCCON甲烷观测在卫星遥感反演验证、城市排放、煤矿区排放、畜牧业排放等方面的研究进展,呈现了COCCON仪器在我国城市及煤矿区甲烷监测中的初步应用并展望了下一步需要研究的重点问题。

Carbon Column Observation Cooperative Network (COCCON) progress and prospects of its methane monitoring application in China
Abstract:

Ground-based remote sensing technology is an effective tool for monitoring atmospheric greenhouse gas column concentrations calibrating satellite and studying carbon sinks. The COllaborative Carbon Column Observing Network (COCCON) is a global network of portable Fourier transform infrared (FTIR) spectrometers EM27/SUN that is compact and mobile. The COCCON instrument is appropriate for field campaigns as well as for long-term deployment at a site which effectively complements the Total Carbon Column Observing Network (TCCON). In addition, its excellent robust and reliable characteristics have been demonstrated in several successful field campaigns. Karlsruhe Institute of Technology (KIT) conducts the optimization, subjecting each unit to an expert performance assessment and fine-tuning, while also calibrating it in reference to the EM27/SUN spectrometer utilized at KIT and the TCCON site in Karlsruhe. As part of European Space Agency (ESA) initiatives, KIT has developed open-source and freely accessible codes for processing and analyzing COCCON measurement spectra. In this paper, we introduce the instrumental line shape (ILS), a critical factor for obtaining precise information from measurements. The ILS parameters can be derived by conducting an open-path observation of a few meters of lab air. Additionally, the paper presents the high-precision inversion algorithm PROFFAST, designed for the retrieval of column-averaged dry-air mole fractions of gas (Xgas). This work also presents various studies on satellite validation and methane emission from urban areas, coal mines and livestock using COCCON methane observations. Furthermore, we provide preliminary applications of COCCON instruments in monitoring methane levels within urban region (Xuzhou) and coal mining region (Shanxi) in China. Initial analyses have revealed that methane concentrations in the coal mines under study in China surpass those observed in European contexts. These elevated concentrations are closely related to variations in mining activities in different coal mines. Subsequent findings are currently being prepared for further publication. Considering that the COCCON network is mainly applied in western countries, there is an urgent need to develop region-specific ground-based remote sensing inversion techniques for assessing EM27/SUN methane emissions in China. This urgency stems from the complex nature of emission sources and high-concentration pollution scenarios unique to China. Two different aspects should be considered: dual influences of diffusion and transport, such as mutual diffusion effects among multiple coal mine emissions, as well as the effects of complex atmospheric boundary layer changes under aerosol-atmospheric boundary layer interactions.

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