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开放型沉陷湖泊溶解无机碳来源解析 |
Source Apportionment of Dissolved Inorganic Carbon in An Open Subsidence Lake |
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DOI: |
中文关键词: 溶解无机碳 沉陷湖泊 地下水 来源解析 |
英文关键词: Dissolved inorganic carbon Subsidence lake Groundwater Source apportionment |
基金项目:国家自然科学基金资助项目(42107055,52174156) |
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中文摘要: |
以安徽省北部开放型沉陷湖泊(口孜东矿沉陷湖)为研究对象,利用各端元溶解性无机碳(DIC)含量及端元模型和CO2扩散模型,确定地下水排放输入的碳通量。结果表明:δ13CDIC与DIC在不同水体中具有相似的变化趋势,两者之间虽然具有一定的相关性,但总体不显著,水化学要素是影响δ13CDIC值空间分布的主要原因;沉陷湖水、河水及地下水中DIC来源为土壤CO2和碳酸盐岩风化,且沉陷湖水中的DIC大部分来自碳酸盐岩风化;水〖CD*2〗气界面CO2通量均值达到16426mmol/(m2·d),河流输入CO2通量达到36831mmol/(m2·d),来自地下水的CO2通量为5770mmol/(m2·d)。 |
英文摘要: |
Taking an open subsidence lake(Kouzidong mine subsidence lake) in northern Anhui as the research object, the carbon flux from groundwater was determined by the content of dissolved inorganic carbon(DIC) of each endmember, endmember model and CO2 diffusion model. The results showed that δ13CDIC and DIC had similar variation trends in different water bodies, although there was a certain correlation between them, it was not significant in general. Hydrochemical factors were the main reason affecting the spatial distribution of δ13CDIC. DIC in subsidence lake, river water and groundwater originated from CO2 in soil and the weathering of carbonate rocks, and most of the DIC in subsidence lake was from the weathering of carbonate rocks. The average CO2 flux at the water air interface reached 164.26 mmol/(m2·d). The CO2 flux from river reached 368.31 mmol/(m2·d), and the CO2 flux from groundwater was 57.70 mmol/(m2·d). |
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