Carbon Fluxes and Sinks： the Consumption of Atmospheric and Soil CO2 by Carbonate Rock Dissolution

Carbonate rock outcrops cover 9%-16% of the continental area and are the principal source of the dissolved inorganic carbon （DIC） transferred by rivers to the oceans, a consequence their dissolution. Current estimations suggest that the flux falls between 0.1-0.6 PgC/a. Taking the intermediate value...

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Bibliographic Details
Published in:Acta geologica Sinica (Beijing) 2012-08, Vol.86 (4), p.963-972
Main Authors: Jianhua, CAO, Daoxian, YUAN, GROVES, Chris, Fen, HUANG, Hui, YANG, Qian, LU
Format: Article
Language:English
Subjects:
Carbon
carbon flux and sink
carbon transfer
carbonate rock
Consumption
Dissolution
Environmental impact
exchange between inorganic carbon and organic carbon
土壤CO2
大气
接收器
消费
溶解无机碳
碳通量
碳酸盐岩
碳酸盐溶解作用
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Summary:Carbonate rock outcrops cover 9%-16% of the continental area and are the principal source of the dissolved inorganic carbon （DIC） transferred by rivers to the oceans, a consequence their dissolution. Current estimations suggest that the flux falls between 0.1-0.6 PgC/a. Taking the intermediate value （0.3 PgC/a）, it is equal to 18% of current estimates of the terrestrial vegetation net carbon sink and 38% of the soil carbon sink. In China, the carbon flux from carbonate rock dissolution is estimated to be 0.016 PgC/a, which accounts for 21%, 87.5%-150% and 2.3 times of the forest, shrub and grassland net carbon sinks respectively, as well as 23%-40% of the soil carbon sink flux. Carbonate dissolution is sensitive to environmental and climatic changes, the rate being closely correlated with precipitation, temperature, also with soil and vegetation cover. HCO3 in the water is affected by hydrophyte photosynthesis, resulting in part of the HCO~ being converted into DOC and POC, which may enhance the potential of carbon sequestration by carbonate rock dissolution. The possible turnover time of this carbon is roughly equal to that of the sea water cycle （2000a）. The uptake of atmospheric/soil CO2 by carbonate rock dissolution thus plays an important role in the global carbon cycle, being one of the most important sinks. A major research need is to better evaluate the net effect of this sink in comparison to an oceanic source from carbonate mineral precipitation.
ISSN:1000-9515
1755-6724
DOI:10.1111/j.1755-6724.2012.00720.x