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. 2020 Sep;58(3):e2019RG000681. doi: 10.1029/2019RG000681

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©2020. The Authors.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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The impact of biogeochemical processes on pH. (a) The change in pH for aerobic mineralization with and without nitrification. (b) The change in pH due to sulfate reduction and methanogenesis. (c) The change in pH due to primary production based on ammonium or nitrate. (d) The change in pH due to calcification and calcium carbonate dissolution. Note the break at the pH corresponding to calcium carbonate equilibrium (modified from Soetaert et al., 2007). Details of the calculations are presented in the supporting information.