文献类型：期刊文献

英文题名：Continental-scale impact of bomb radiocarbon affects historical fossil fuel carbon dioxide reconstruction

作者：Li, Jing[1] Wei, Nannan[2] Wang, Xu[3] Li, Pingyang[1] Sun, Yanmin[1] Feng, Wenbiao[1] Cheng, Zhineng[1] Zhu, Sanyuan[1] Wang, Weimin[4] Chen, Duohong[5] Zhao, Shizhen[1] Zhong, Guangcai[1] Zhou, Guangyi[3] Li, Jun[1] Zhang, Gan[1]

第一作者：Li, Jing

通信作者：Zhang, G[1];Wang, X[2]

机构：[1]Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Adv Environm Technol, Guangzhou, Peoples R China;[2]Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China;[3]Chinese Acad Forestry, Trop Forestry Res Inst, Guangzhou, Peoples R China;[4]Shenzhen Ecol & Environm Monitoring Ctr Guangdong, Shenzhen, Peoples R China;[5]Minist Ecol & Environm, Guangdong Ecol & Environm Monitoring Ctr, Environm Key Lab Reg Air Qual Monitoring, Guangzhou, Peoples R China

年份：2025

卷号：6

期号：1

外文期刊名：COMMUNICATIONS EARTH & ENVIRONMENT

收录：;Scopus(收录号：2-s2.0-105012109076);WOS:【SCI-EXPANDED(收录号:WOS:001538716400003)】；

基金：This work is supported by the National Natural Science Foundation of China (Grant no. 42330715, 42030715, 42203081 and 42103082), Guangdong Provincial Applied Science and Technology Research and Development Program (Grant no. 2022A1515011851, 2022A1515011271 and 2023A1515011301), and the China Postdoctoral Science Foundation (Grant no. 2021M693184). We appreciate the contributions of Beijiangyuan forest ecosystem national observation and research station, Nanling Mts to our research. We sincerely thank the KECK AMS Laboratory, University of California, Irvine, for their invaluable training and guidance in high-precision AMS-14C measurements and we acknowledge Dr. John Southon for his essential support in the development of AMS Laboratory at GIGCAS. We are also grateful to Dr. Zongshan Li and Jie Liu from the Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, for their technical support in tree-ring dating and Dr. Jiajia Su from School of geography and remote sensing, Guangzhou University, for his guidance on tree-ring sampling, sample polishing and annual ring cutting.

语种：英文

摘要：Historical reconstructions of fossil fuel carbon dioxide emissions are vital to setting emission mitigation strategies, and tree-ring radiocarbon analysis provides a reliable approach. However, residual radiocarbon from past nuclear tests can distort the signal, and regional variations beyond the well-known latitudinal gradient remain underexplored. Here we analyzed tree-ring radiocarbon records from Nanling (1921-2020, this study) and published datasets to identify spatial patterns of bomb-derived fallout in China from 1965 to 1985. Compared to latitudinal compilations and European backgrounds, radiocarbon enhancements extended up to 3000 km from test sites, highlighting the dominant role of source characteristics. We further demonstrate that re-release of bomb radiocarbon from terrestrial ecosystems prolongs its regional atmospheric residence time to 5-20 years, introducing spatial variability that biases fossil fuel carbon dioxide reconstructions up to 5.4 ppm. These findings underscore the need to integrate source-specific fallout and atmospheric transport into regional radiocarbon interpretation frameworks.