This study presents a process-based-empirical model for the assessment of ionic fluxes derived from chemical weathering of rocks (ICWR) at a global scale. The equations are designed and the parameters fitted using riverine transport of dissolved major ions Ca2+, Mg2+, K+, Na+, Cl−, SO42−, and alkalinity at a global scale by combining point sampling analysis with spatial descriptions of hydrology, climate, topography, lithology and soil variables such as mineral composition and regolith thickness. Different configurations of the model are considered and the results show that the previously reported “soil shielding” effect on chemical weathering (CW) of rocks presents different values for each of the ions considered. Overall, there is good agreement between median and ranges in observed and simulated data, but further analysis is required to downscale the model to catchment scale. Application to the global scale provides the first global ICWR map, resulting in an average cationic flux derived from chemical weathering of 734·106 Mg·y−1, where 58% is Ca2+, 15% is Mg2+, 24% is Na+ and 3% is K+, and an average anionic flux derived from chemical weathering of 2640·106 Mg·y−1, where 74% is alkalinity, 18% is SO42−, and 8% is Cl−. Hyperactive and hotspot areas are elucidated and compared between ions.

中文翻译：

---

从全球范围内溶解的主要元素的河流运输评估大陆化学风化的模型

本研究提出了一种基于过程的经验模型，用于评估全球范围内源自岩石化学风化 (ICWR) 的离子通量。通过将点采样分析与水文、气候、地形的空间描述相结合，使用全球范围内溶解的主要离子 Ca2+、Mg2+、K+、Na+、Cl−、SO42− 和碱度的河流传输设计方程并拟合参数。岩性和土壤变量，如矿物成分和风化层厚度。考虑了模型的不同配置，结果表明，先前报告的对岩石化学风化 (CW) 的“土壤屏蔽”效应对于所考虑的每种离子呈现不同的值。总体而言，观察数据和模拟数据的中位数和范围之间有很好的一致性，但需要进一步分析将模型缩小到流域规模。应用于全球尺度提供了第一张全球 ICWR 地图，产生了来自化学风化的平均阳离子通量 734·106 Mg·y−1，其中 58% 是 Ca2+，15% 是 Mg2+，24% 是 Na+ 和 3%是 K+，来自化学风化的平均阴离子通量为 2640·106 Mg·y-1，其中 74% 为碱度，18% 为 SO42-，8% 为 Cl-。阐明和比较离子之间的过度活跃和热点区域。18% 是 SO42-，8% 是 Cl-。阐明和比较离子之间的过度活跃和热点区域。18% 是 SO42-，8% 是 Cl-。阐明和比较离子之间的过度活跃和热点区域。