| 岩溶水系统对大气CO2的潜在影响——基于热力学的研究 |
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| 引用本文： | 蒋倩,李心清,丁文慈,赵彦龙,闫慧.岩溶水系统对大气CO2的潜在影响——基于热力学的研究[J].矿物岩石地球化学通报,2006,25(3):226-235. |
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| 作者姓名： | 蒋倩 李心清 丁文慈 赵彦龙 闫慧 |
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| 作者单位： | 1. 中国科学院,地球化学研究所,环境地球化学国家重点实验室,贵阳550002;中国科学院,研究生院,北京,100049
2. 中国科学院,地球化学研究所,环境地球化学国家重点实验室,贵阳550002 |
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| 基金项目： | 中国科学院创新团队国际合作伙伴计划资助项目;中国科学院百人计划资助项目（20020723） |
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| 摘 要： | 认识不同条件下岩溶水释放或吸收CO2的反应过程是研究碳酸盐岩对碳循环响应的前提和基础。本文从吉布斯自由能的热力学原理出发,对全球不同岩溶地区162组岩溶水(河水、溪水、湖水等)进行了热力学研究,结果显示:1)河水、溪水、湖水和洞穴滴水等岩溶水所处的环境因方解石矿物沉积而释放CO2成为大气CO2一个潜在的源;2)地下水在所处的环境下由于方解石的溶解而吸收CO2,成为大气CO2一个潜在的汇;3)少数出露点的泉水所处的环境既可发生方解石的溶解而吸收CO2,成为大气CO2的潜在汇,也可发生方解石的沉积而释放CO2,成为大气CO2的潜在源;4)在洪水期,泉水的水化学特征变化并未导致对大气CO2潜在贡献在源汇之间的跨跃性转变。162组岩溶水数据中,所有河水与溪水皆无一例外地在释放CO2。结果表明,从吉布斯自由能的热力学原理出发,研究岩溶水系统对大气CO2潜在源汇的贡献,没有条件约束,是一种较好的途径。
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| 关 键 词： | 碳酸盐岩 无机碳库 CO2源 CO2汇 热力学 大气化学 水化学 |
| 文章编号： | 1007-2802（2006）03-0226-10 |
| 收稿时间： | 2006-03-21 |
| 修稿时间： | 2006-05-25 |
Geochemistry of Water System in Karst Regions and the Atmospheric CO2 :Thermodynamic Studies |
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| JIANG Qian,LI Xin-qing,DING Wen-ci,ZHAO Yan-long,YAN Hui.Geochemistry of Water System in Karst Regions and the Atmospheric CO2 :Thermodynamic Studies[J].Bulletin of Mineralogy Petrology and Geochemistry,2006,25(3):226-235. |
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| Authors: | JIANG Qian LI Xin-qing DING Wen-ci ZHAO Yan-long YAN Hui |
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| Abstract: | It is believed that to study the CO_2 releasing or absorbing processes of the Karst water corresponding to the dissolution or formation of carbonate in various environments is the precondition and base for studying carbon cycling effect caused by the dissolution or formation of carbonate.By using Gibbs free energy thermodynamic theory,162 batches of data for waters sampled from rivers,streams,lakes,springs,underground rivers etc.in different Karst regions were collected for thermodynamic study.Our results have revealed that,1) The waters in rivers,streams,lakes,and dripping waters in caves could release CO_2 to atmosphere due to the deposition of calcite.They could be potential sources for CO_2 in atmosphere;2) The underground waters could absorb CO_2 due to the dissolution of carbonate.They could be sinks of CO_2 indirectly;3) The spring waters could not only absorb CO_2 due to carbonate dissolution but also release CO_2 due to carbonate deposition.They could be sinks or sources of CO_2 indirectly;4) the variation of hydrochemical characters of spring waters in flooding period does not change their original properties as sinks or sources of CO_2 dramatically.It is indicated that all river waters and spring waters are releasing CO_2 into atmosphere,based on 162 batches of data.The results show that the Gibbs free energy thermodynamic theory could be used to study if the water in Karst areas could be the potential sources or sinks of CO_2 in atmosphere without any limitation. |
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| Keywords: | Carbonatite inorganic carbon reservior carbon dioxide source carbon dioxide sink thermodynamics atmosphere chemistry hydrochemistry |
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