Glacial atmospheric CO2 decline in association with decrease of marine sedimentary phosphorus |
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Authors: | Weng Huanxin Zhang Xingmao Wu Nengyou Wang Ying Chen Lihong Zhong Hexian and Qin Yachao |
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Institution: | (1) Institute of Environment & Biogeochemistry, Zhejiang University, Hangzhou, 310027, China;(2) Guangzhou Marine Geological Survey, CGS, MLR, Guangzhou, 510760, China |
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Abstract: | The environmental and biogeochemical information extracted from the sediments collected from the northern shelf of the South
China Sea shows that terrigenous inputs of phosphorus into the sea remained relatively constant, and the variation of phosphorus
contents at different depths was caused by climatic and environmental changes. The findings also suggest that the vertical
variation of phosphorus content was opposite to those of calcium carbonate and cadmium, and the functional correlation between
CO2 and PO
4
3−
in seawater was given by calculating the chemical equilibrium, indicating that the accumulation of marine sedimentary phosphorus
may have something to do with the variation of atmospheric CO2. The decreased phosphorus accumulation as well as the correspondingly-increased calcium carbonate content might be one of
key factors causing glacial atmospheric CO2 decline. |
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Keywords: | sedimentary phosphorus calcium carbonate atmospheric CO2 northern shelf of the South China Sea biogeochemistry |
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