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- W2053215763 abstract "Ongoing global warming induced by anthropogenic emissions has opened the debate as to whether geoengineering is a 'quick fix' option. Here we analyse the intended and unintended effects of one specific geoengineering approach, which is enhanced weathering via the open ocean dissolution of the silicate-containing mineral olivine. This approach would not only reduce atmospheric CO2 and oppose surface ocean acidification, but would also impact on marine biology. If dissolved in the surface ocean, olivine sequesters 0.28 g carbon per g of olivine dissolved, similar to land-based enhanced weathering. Silicic acid input, a byproduct of the olivine dissolution, alters marine biology because silicate is in certain areas the limiting nutrient for diatoms. As a consequence, our model predicts a shift in phytoplankton species composition towards diatoms, altering the biological carbon pumps. Enhanced olivine dissolution, both on land and in the ocean, therefore needs to be considered as ocean fertilization. From dissolution kinetics we calculate that only olivine particles with a grain size of the order of 1 μm sink slowly enough to enable a nearly complete dissolution. The energy consumption for grinding to this small size might reduce the carbon sequestration efficiency by ∼30%." @default.
- W2053215763 created "2016-06-24" @default.
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- W2053215763 date "2013-01-21" @default.
- W2053215763 modified "2023-10-16" @default.
- W2053215763 title "Geoengineering impact of open ocean dissolution of olivine on atmospheric CO <sub>2</sub> , surface ocean pH and marine biology" @default.
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- W2053215763 doi "https://doi.org/10.1088/1748-9326/8/1/014009" @default.
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