GSTDTAP  > 地球科学
DOI10.1073/pnas.2016430118
Global silicate weathering flux overestimated because of sediment–water cation exchange
Edward T. Tipper; Emily I. Stevenson; Victoria Alcock; Alasdair C. G. Knight; J. Jotautas Baronas; Robert G. Hilton; Mike J. Bickle; Christina S. Larkin; Linshu Feng; Katy E. Relph; Genevieve Hughes
2021-01-05
发表期刊Proceedings of the National Academy of Science
出版年2021
英文摘要

Rivers carry the dissolved and solid products of silicate mineral weathering, a process that removes CO2 from the atmosphere and provides a key negative climate feedback over geological timescales. Here we show that, in some river systems, a reactive exchange pool on river suspended particulate matter, bonded weakly to mineral surfaces, increases the mobile cation flux by 50%. The chemistry of both river waters and the exchange pool demonstrates exchange equilibrium, confirmed by Sr isotopes. Global silicate weathering fluxes are calculated based on riverine dissolved sodium (Na+) from silicate minerals. The large exchange pool supplies Na+ of nonsilicate origin to the dissolved load, especially in catchments with widespread marine sediments, or where rocks have equilibrated with saline basement fluids. We quantify this by comparing the riverine sediment exchange pool and river water chemistry. In some basins, cation exchange could account for the majority of sodium in the river water, significantly reducing estimates of silicate weathering. At a global scale, we demonstrate that silicate weathering fluxes are overestimated by 12 to 28%. This overestimation is greatest in regions of high erosion and high sediment loads where the negative climate feedback has a maximum sensitivity to chemical weathering reactions. In the context of other recent findings that reduce the net CO2 consumption through chemical weathering, the magnitude of the continental silicate weathering fluxes and its implications for solid Earth CO2 degassing fluxes need to be further investigated.

领域地球科学
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/309064
专题地球科学
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Edward T. Tipper,Emily I. Stevenson,Victoria Alcock,等. Global silicate weathering flux overestimated because of sediment–water cation exchange[J]. Proceedings of the National Academy of Science,2021.
APA Edward T. Tipper.,Emily I. Stevenson.,Victoria Alcock.,Alasdair C. G. Knight.,J. Jotautas Baronas.,...&Genevieve Hughes.(2021).Global silicate weathering flux overestimated because of sediment–water cation exchange.Proceedings of the National Academy of Science.
MLA Edward T. Tipper,et al."Global silicate weathering flux overestimated because of sediment–water cation exchange".Proceedings of the National Academy of Science (2021).
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