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"Old" carbon entering the South China Sea from the carbonate-rich Pearl River Basin: Coupled action of carbonate weathering and aquatic photosynthesis
Zaihua Liu;  Min Zhao;  Hailong Sun;  Rui Yang;  Bo Chen;  Mingxing Yang;  Qingrui Zeng;  Haitao Zeng
2017
发表期刊Applied Geochemistry
卷号78页码:96-104
摘要

Generally, negative Delta C-14 values of riverine particulate organic carbon (POC) are interpreted as old carbon derived from the erosion of deep soils and sedimentary rocks. Here we present natural C-14 and C-13 data from the carbonate-rich Pearl River Basin that discharges into the South China Sea. We found that the Delta C-14 values of POC and DIC (dissolved inorganic carbon) transported by the carbonate-rich river are all negative. This, however, does not mean the POC is necessarily old but indicates control of carbonate weathering (producing "old" DIC with negative Delta C-14 values) coupled with contemporary aquatic photosynthesis (producing new autochthonous POC but with negative Delta C-14 values) through the "dead carbon" effect of carbonate rocks, which was further evidenced by particular seasonal change in Delta C-14 values of DIC and POC (both higher in the rainy season and lower in dry season), spatial variation (both getting higher downstream), and negative correlation between delta C-13 and "age" of POC. This finding indicates that previous studies suggesting that riverine POC depleted in C-14 is old may be problematic in carbonate-dominated river basins. The finding that river basins rich in carbonates can release "old" POC may have important implications for the interpretation of organic carbon age in rivers and coastal oceans affected by the runoff from this basin type. It also indicates that it is necessary to examine the concentrations of both DIC and autochthonous organic carbon in rivers to correctly assess the carbon sink produced by rock weathering. 

关键词Carbon Age Dicpoc Carbon Source Carbonate Weathering Aquatic Photosynthesis Pearl River
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8172
专题环境地球化学国家重点实验室
作者单位1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China
2.University of Chinese Academy of Sciences, Beijing, China
推荐引用方式
GB/T 7714
Zaihua Liu;Min Zhao;Hailong Sun;Rui Yang;Bo Chen;Mingxing Yang;Qingrui Zeng;Haitao Zeng. "Old" carbon entering the South China Sea from the carbonate-rich Pearl River Basin: Coupled action of carbonate weathering and aquatic photosynthesis[J]. Applied Geochemistry,2017,78:96-104.
APA Zaihua Liu;Min Zhao;Hailong Sun;Rui Yang;Bo Chen;Mingxing Yang;Qingrui Zeng;Haitao Zeng.(2017)."Old" carbon entering the South China Sea from the carbonate-rich Pearl River Basin: Coupled action of carbonate weathering and aquatic photosynthesis.Applied Geochemistry,78,96-104.
MLA Zaihua Liu;Min Zhao;Hailong Sun;Rui Yang;Bo Chen;Mingxing Yang;Qingrui Zeng;Haitao Zeng.""Old" carbon entering the South China Sea from the carbonate-rich Pearl River Basin: Coupled action of carbonate weathering and aquatic photosynthesis".Applied Geochemistry 78(2017):96-104.
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