大气14CO2的时空分异特征及其在化石源CO2示踪中的应用

摘要

大气CO2中放射性碳同位素（14C）的水平可以反映化石源CO2的影响程度，这对于评估我国目前化石源CO2的排放状况和制定节能减排政策具有重要的指导意义。本文在概述大气14CO2采样和分析方法的基础上，简要介绍了大气14CO2观测的起源和主要的源汇过程，重点论述了大气14CO2的时空分异特征及其驱动因素；阐述了化石源CO2浓度的估算方法及14CO2在国内外化石源CO2示踪中的应用现状，并对大气14CO2观测在我国化石源CO2示踪中的应用前景进行了展望；旨在为我国正确地开展大气14CO2的观测研究，深刻地理解特定区域大气14CO2的时空分异特征和化石源CO2的分布状况提供参考。%The level of radiocarbon (14C) in atmospheric CO2 can be used to trace the concentrations of fossil fuel CO2, which is a valuable tool for the governments to understand the current emissions of fossil fuel CO2, and then to formulate mitigation strategies for CO2 emissions. In this paper, the observation history, source and sink, and collection and analysis methods of14CO2 is brielfy reviewed, with the emphasis on the characteristics of spatial-temporal14CO2 variations and its driving forces. In addition, the method to calculate fossil fuel CO2 concentration and its application on the tracing of fossil fuel CO2 at abroad and home is presented, along with the suggestions for the future14CO2 study in China. This paper will help to understand the characteristics of14CO2 and current distributions of fossil fuel CO2 in China.