研究报告
解晨骥,高全洲,陶贞,刘龙海,李珊迟.东江流域化学风化对大气CO2的吸收[J].环境科学学报,2013,33(8):2123-2133
东江流域化学风化对大气CO2的吸收
- Chemical weathering and CO2 consumption in the Dongjiang River Basin
- 基金项目：国家自然科学基金(No.41071054);中国地质调查局地调项目(岩[2011]地调01-01-23);中央高校基本科研业务费专项资金(No.11lgjc13,11lgjc10)
- 作者
- 单位
- 解晨骥
- 中山大学地理科学与规划学院, 广东省城市化与地理环境空间模拟重点实验室, 广州 510275
- 高全洲
- 1. 中山大学地理科学与规划学院, 广东省城市化与地理环境空间模拟重点实验室, 广州 510275;
2. 广东省地质过程与矿产资源探查重点实验室, 广州 510275
- 陶贞
- 中山大学地理科学与规划学院, 广东省城市化与地理环境空间模拟重点实验室, 广州 510275
- 刘龙海
- 中山大学地理科学与规划学院, 广东省城市化与地理环境空间模拟重点实验室, 广州 510275
- 李珊迟
- 中山大学地理科学与规划学院, 广东省城市化与地理环境空间模拟重点实验室, 广州 510275
- 摘要：对东江化学径流进行分析,使用质量平衡法和扣除法估算了流域化学风化对大气CO2的吸收通量.结果表明,东江水体的总溶解性固体(TDS)含量均值(59.88 mg·L-1)远低于世界河流均值(100 mg·L-1);离子组成以Ca2+、Na+和HCO3-为主,可溶性Si 次之,径流对总溶解固体的稀释效应由于受人类活动影响表现得并不明显.东江化学径流组成主要源自硅酸盐矿物的化学风化过程的贡献(72.46%~81.54%),其次为海盐贡献(17.65%~26.05%),碳酸盐矿物的贡献很少(0.81%~3.87%);大气CO2是流域内岩石化学风化的主要侵蚀介质,但H2SO4和HNO3的作用也不可忽视;东江流域岩石化学风化过程对大气CO2的消耗通量(3.02~3.08)×105 mol·km-2·a-1高于全球平均值,是全球岩石风化碳汇的一个重要组成部分.
- Abstract：Chemical runoff of Dongjiang River was investigated, and the mass balance approach and deduction methods were used to estimate the uptake of atmospheric CO2 through rock chemical weathering. We conclude that the concentration of total dissolved solids in the Dongjiang River (59.88 mg·L-1) is far lower than the averages of rivers worldwide (100 mg·L-1) and the chemical composition of the river is dominated with Ca2+, Na+ and HCO3-, followed by dissolved Si. The dilution effect of the surface runoff on riverine total dissolved solids is not obvious due to human activities. Chemical runoff of the Dongjiang River is mainly derived from the chemical weathering of silicate mineral (72.46%~81.54%), followed by sea salt (17.65%~26.05%), while the contribution from the chemical weathering of carbonate minerals (0.81%~3.87%) is insignificant. Atmospheric CO2 is the main aggressive medium in the rocks chemical weathering within the basin. The CO2 consumption flux (3.02×105~3.08×105 mol·km-2·a-1) of chemical weathering processes in the Dongjiang River Basin is higher than that of the global average, which constitutes an important component of CO2 consumption in the global rocks chemical weathering.
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