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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Chemical weathering and the role of sulfuric and nitric acids in carbonate weathering: Isotopes (~(13)C, ~(15)N, ~(34)S, and ~(18)O) and chemical constraints
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Chemical weathering and the role of sulfuric and nitric acids in carbonate weathering: Isotopes (~(13)C, ~(15)N, ~(34)S, and ~(18)O) and chemical constraints

机译：化学风化和硫酸硝酸在碳酸盐风化中的作用：同位素（〜（13）c，〜（15）n，〜（34）s，〜（18）o）和化学限制

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摘要

Multiple isotopes (~(13)C-DIC, ~(34)S and ~(18)O-SO_4~(2-), ~(15)N and ~(18)O-NO_3~-) and water chemistry were used to evaluate weathering rates and associated CO_2 consumption by carbonic acid and strong acids (H_2SO_4 and HNO_3) in a typical karst watershed (Wujiang River, Southwest China). The dual sulfate isotopes indicate that sulfate ismainly derived fromsulfide oxidation in coal stratum and sulfide-containingminerals, and dual nitrate isotopes indicate that nitrate is mainly derived from soil N and nitrification. The correlation between isotopic compositions and water chemistry suggests that sulfuric and nitric acids, in addition to carbonic acid, are involved in carbonate weathering. The silicate and carbonate weathering rates are 7.2 t km~(-2) yr~(-1) and 76 t km~(-2) yr~(-1), respectively. In comparison with carbonate weathering rates (43 tkm~(-2) yr~(-1)) by carbonic acid alone, the subsequent increase in rates indicates significant enhancement of weathering when combined with sulfuric and nitric acids. Therefore, the role of sulfuric and nitric acids in the rock weathering should be considered in the global carbon cycle.
机译：多同位素（〜（13）C-DIC，〜（34）S和〜（18）O-SO_4〜（2-），〜（15）N和〜（18）O-NO_3〜 - ）和水化学是用于评估碳酸和强酸（H_2SO_4和HNO_3）在典型的喀斯特流域（中国西南部）中的碳酸和强酸（H_2SO_4和HNO_3）评估风化速率和相关的CO_2。双硫酸盐同位素表明，硫酸盐在煤层和含硫化物中源于硫化物氧化，双硝酸盐同位素表明硝酸盐主要来自土壤N和硝化。同位素组合物与水化的相关性表明，除了碳酸外，硫酸硝酸也参与碳酸盐风化。硅酸盐和碳酸盐风化率分别为7.2吨Km〜（-2）Yr〜（-1）和76吨KM〜（-2）Yr〜（-1）。与单独的碳酸单独的碳酸盐风化速率（43tkm〜（-2）Yr〜（-1））相比，随后的速率增加表明，当与硫酸和硝酸组合时，耐候性显着提高。因此，在全球碳循环中应考虑硫酸和硝酸在岩石风化中的作用。

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