甲烷 (CH4) 浓度变化是当前气候变化研究中的一个焦点问题。红外高光谱遥感技术已经成为探测大气CH4浓度变化的重要技术手段。本文针对红外高光谱CH4地基遥感反演技术，介绍了国际上重要的观测网络，包括TCCON (Total Carbon Column Observing Network)，NDACC-IRWG (Network for the Detection of Atmospheric Composition Change - the Infrared Working Group) 和COCCON (COllaborative Carbon Column Observing Network)，讨论了这些观测网络的主要特点，包括观测仪器、波段设置、反演算法、产品特性等。针对红外高光谱CH4浓度卫星遥感反演，概述了国际上的CH4卫星遥感发展现状。同时，以日本GOSAT (Greenhouse gases Observing SATellite) 卫星为例，探讨了卫星CH4遥感地基验证工作中的关键技术，阐明了地基遥感对于卫星CH4遥感产品改进的重要性。最后，利用TCCON香河站的观测资料，对最新版的TROPOMI (TROPOspheric Monitoring Instrument) 卫星CH4观测反演数据产品进行了地基验证，表明在华北地区TROPOMI CH4柱浓度产品达到了其观测精度目标设定要求；TROPOMI观测得到的CH4柱浓度年增长率要略高于TCCON的观测结果，两者相差0.263±0.172 %/年；地基与卫星的差值具有季节变化特征，春季卫星的观测值大于TCCON观测值约0.3%，秋季卫星的观测值小于TCCON观测值约0.2%。

Methane (CH4) is the second most important greenhouse gas in the Earth"s atmosphere, after carbon dioxide (CO2). Understanding the change of CH4 concentration is a very challenging task in atmospheric research as it has various sources. Remote sensing has now become an effective technique to monitor CH4 concentrations globally. In this study, we presented an overview of CH4 column retrievals based on ground-based and space-based infrared spectra and related satellite validations. Currently, there are three ground-based remote sensing international observation networks providing CH4 columns, namely the Total Carbon Column Observing Network (TCCON), the NDACC-IRWG (Network for the Detection of Atmospheric Composition Change - the Infrared Working Group), and the COCCON (COllaborative Carbon Column Observing Network). The main characteristics of the three networks were presented. Regarding the satellite CH4 retrievals, we discussed several well-known sensors and their retrieval algorithms. Meanwhile, by taking the GOSAT (Greenhouse gases Observing SATellite) as an example, key parameters during the satellite CH4 validation were discussed. Finally, we described the ground-based CH4 column retrievals and related satellite validations at Xianghe, North China.