全球地下水碳通量与大气风化神话。

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Groundwater Pub Date : 2024-12-19 DOI:10.1111/gwat.13457
Warren W. Wood, Ward E. Sanford, John A. Cherry, Warren T. Wood
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引用次数: 0

摘要

我们最近的稳态质量平衡模型表明,全球大多数硅酸盐岩石的碳酸风化发生在含水层系统的渗透带,而不是在大气CO2的表面。即风化溶质通量几乎等于全球大陆河流碳通量总量,表明大气中碳酸的风化作用很小。这一发现挑战了以前利用硅酸盐风化作为大气二氧化碳水平控制的碳模型。利用地理空间机器学习算法生成的全球地下水碳浓度估估与地理信息系统环境下的补给通量相结合,得出全球地下水向地表环境的总碳通量在0.87至0.96 Pg C/年之间。在排放到地表时,碳以CaCO3的形式存在于0.01 ~ 0.11 Pg C/年之间;0.35和0.38 Pg C/年为CO2气体;溶解的HCO3 -分别为0.49和0.51 Pg C/年。计算了直接海洋排放的总风化碳通量(0.030 Pg C/年);内陆盆地(0.046 Pg C/年);冷湿型古盆地(0.058 Pg C/年);暖干型盆地(0.072 Pg C/年);干冷型盆地(0.115 Pg C/年);暖湿型盆地(0.448 Pg C/年)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Global Groundwater Carbon Mass Flux and the Myth of Atmospheric Weathering

Our recent steady-state mass-balance modeling suggests that most global carbonic-acid weathering of silicate rocks occurs in the vadose zone of aquifer systems not on the surface by atmospheric CO2. That is, the weathering solute flux is nearly equal to the total global continental riverine carbon flux, signifying little atmospheric weathering by carbonic acid. This finding challenges previous carbon models that utilize silicate weathering as a control of atmospheric CO2 levels. A robust analysis utilizing global estimates of groundwater carbon concentration generated by a geospatial machine learning algorithm was coupled with recharge flux in a geographic information system environment to yield a total global groundwater carbon flux of between 0.87 and 0.96 Pg C/year to the surface environment. On discharging to the surface, the carbon is speciated between 0.01 and 0.11 Pg C/year as CaCO3; 0.35 and 0.38 Pg C/year as CO2 gas; and 0.49 and 0.51 Pg C/year as dissolved HCO3. This total weathering carbon flux was calculated for direct ocean discharge (0.030 Pg C/year); endorheic basins (0.046 Pg C/year); cold-wet exorheic basins (0.058 Pg C/year); warm-dry exorheic basins (0.072 Pg C/year); cold-dry exorheic basins (0.115 Pg C/year); and warm-wet exorheic basins (0.448 Pg C/year).

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来源期刊
Groundwater
Groundwater 环境科学-地球科学综合
CiteScore
4.80
自引率
3.80%
发文量
0
审稿时长
12-24 weeks
期刊介绍: Ground Water is the leading international journal focused exclusively on ground water. Since 1963, Ground Water has published a dynamic mix of papers on topics related to ground water including ground water flow and well hydraulics, hydrogeochemistry and contaminant hydrogeology, application of geophysics, groundwater management and policy, and history of ground water hydrology. This is the journal you can count on to bring you the practical applications in ground water hydrology.
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