A global model for present‐day atmospheric/soil CO2 consumption by chemical erosion of continental rocks (GEM‐CO2)
A global model for present‐day atmospheric/soil CO2 consumption by chemical erosion of continental rocks (GEM‐CO2)
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DOI：
10.3402/tellusb.v47i1-2.16047
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发表时间：
1995-02
期刊：
影响因子：
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通讯作者：
P. A. Suchet;J. Probst
中科院分区：
文献类型：
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作者：
P. A. Suchet;J. Probst
大陆化学风化所消耗的大气/土壤CO2通量（FCO 2）可由河流中碳酸氢盐通量估算。使用已公布的数据为232个小的整体流域，F CO2和径流（Q）之间的经验关系已确定的主要岩石类型露出大陆。为了验证，适合这些关系的模型适用于加龙河，刚果和亚马逊河流域，以计算这些大型河流流域的平均二氧化碳消费量，模型结果接近以前的估计实地测量的基础上。该模型（GEM-CO 2：全球侵蚀模型的CO 2通量），然后在全球范围内应用，并允许确定的纬度变化的大气/土壤CO2的化学侵蚀的消费。主要结果表明，CO2的消耗主要集中在北方，这是因为北半球大陆面积大，碳酸盐岩比例高，而赤道地区非常潮湿。最后，整个大陆的平均年二氧化碳消耗量为0.26 Gt C y-1，其中72%的通量在北方半球被去除。DOI：10.1034/j.1600-0889.47.issue1.23.x
The flux of atmospheric/soil CO 2 consumed by chemical weathering of the continents ( F CO2 ) can be estimated from river fluxes of bicarbonates. Using published data for 232 small monolithologic watersheds, empirical relationships between F CO2 and runoff ( Q ) have been determined for the major rock types outcropping on the continents. For validation, the models fitted to these relationships are applied to the Garonne, Congo and Amazon river basins to calculate the average CO 2 consumption on these large river basins; the model results are close to previous estimates based on field measurements. The model (GEM-CO 2 : Global Erosion Model for CO 2 fluxes) is then applied at the global scale and allows the determination of latitudinal variations of the consumption of atmospheric/soil CO 2 by chemical erosion. The main results show that the consumption of CO 2 is mainly localized in the Northern hemisphere, because of large continental area with a high proportion of carbonate rocks, and in equatorial regions which are very humid. Finally, the mean annual CO 2 consumption for the whole continents amount to 0.26 Gt C y -1 , and 72% of this flux is removed in the Northern hemisphere. DOI: 10.1034/j.1600-0889.47.issue1.23.x