Program
 
General Session 4: Marine environment, ecosystem & sustainability
 
 
 
Poster
Reconstruction of evolving anthropogenic activities and climate change from pahs and pb deposition in the northern south china sea: more evidence from Pb isotopic composition and positive matrix factorization
GS4-23-S
Yan Lin* , State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102; College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102
Minggang Cai, State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102; College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102
Meng Chen, College of the Environment and Ecology, Xiamen University, Xiamen 361102
Huihong Du, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102
Ye Xu, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102
Weifeng Yang, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102
Fangjian Xu, College of Geosciences, China University of Petroleum, Qingdao 266555
Hongwei Ke, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102
Jiajun Hong, College of the Environment and Ecology, Xiamen University, Xiamen 361102
Shayen Cheng, College of Ocean Science and Resource, National Taiwan Ocean University, Keelung 20224
Presenter Email: 623004480@qq.com
High-resolution records of polycyclic aromatic hydrocarbons (PAHs) and lead (Pb), combined with black carbon (BC), total organic carbon (TOC), grain size and water content were investigated as a multi-indicator approach to estimate the complete input history, sources, and pathway of pollutant to the northern South China Sea (NSCS). Records of PAHs and Pb were similar before 1900 but showed different patterns thereafter, which were induced by the phase-out of leaded gasoline. Strong correlations exited among PAHs, BC, TOC, clay and water content. Except for anthropogenic activities, climate change may also have a significant influence on the deposition of pollutants. Both PAH compositions and Pb isotopic ratios supported major pyrogenic input of atmospheric deposition from mainland China. Principle component analysis of PAHs presented no specific sources, but may reflect possible transport patterns of different PAHs. Combination of Pb isotopic ratios and positive matrix factorization (PMF) receptor model allowed for deeper insight into historical source changes from different perspectives. Pb isotopic ratios suggested major natural source before the 1900s and increasing industrial Pb thereafter. A three-factor PMF model made it clear that pyrogenic sources of biomass burning, coal combustion, and vehicle emissions accounted for 40 ± 20%, 41 ± 13%, and 19 ± 12% of PAHs through the core. Their historical changes corresponded with the results of Pb isotopic ratios to some extend and showed an apparent dominance of vehicle emissions since 2000. Combination of different materials and methods in our study provided a possibility to build a complete picture of anthropogenic activities and avoid uncertainties and bias due to single data.