大气棕碳吸光特性的研究进展

Research Progress in the Absorption Characteristics of Atmospheric Brown Carbon

棕碳(BrC)属于大气中一类重要的吸光性含碳气溶胶。因其对区域乃至全球辐射强迫和气候的显著影响故引起较大关注,而缺乏对区域大气环境中棕碳吸光特性的全面认识是导致其辐射强迫评估不确定性的关键因素之一。人类活动产生的化石燃料排放和生物质燃烧排放均为棕碳的重要来源,但二次源和大气老化过程对其吸光影响可能超过一次燃烧源。近年来,研究污染颗粒物中碳质气溶胶对大气环境的作用机制将在应对气候变化中发挥重要作用。通过梳理国内、外棕碳来源、测量、化学组分和吸光特性的相关研究,在总结排放来源与二次老化对棕碳吸光特性影响的基础上,对未来棕碳吸光特性的研究方向提出建议。

Brown carbon(BrC)is an important class of light absorbing carbon containing aerosols in the atmosphere.Due to its significant impact on regional and global radiation forcing and climate,great attention has been paid in recent years,and the lack of a comprehensive understanding of the light absorption characteristics of BrC in the regional atmospheric environment is one of the key factors leading to uncertainty in its radiation forcing assessment.Fossil fuel emissions and biomass combustion emissions generated by human activities are important sources of brown carbon.However,secondary sources and atmospheric aging processes may have a greater impact on the absorption of brown carbon than primary combustion sources.In recent years,studying the mechanism of carbon aerosols in pollution particles on the atmospheric environment will play an important role in addressing climate change.Based on a review of recent research on the sources,measurements,chemical components,and light absorption characteristics of BrC at home and abroad,and a summary of the impact of emission sources and secondary aging on the light absorption characteristics of BrC,suggestions are proposed for future research directions on the light absorption characteristics of brown carbon.