Geoengineering potential of enhanced dissolution of olivine on land and in the open ocean

作者: Dieter Wolf-Gladrow , Jens Hartmann , Jesse Abrams , Christoph Völker , Peter Köhler

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摘要: We investigate the potential of a specific geoengineering technique: carbon sequestration by artificially enhanced silicate weathering via dissolution olivine. This approach would not only operate against rising temperatures but also oppose ocean acidification. If details marine chemistry are taken into consideration, new mass ratio CO2 per olivine about 1 is achieved, 20% smaller than previously assumed. calculate that this has to sequestrate up Pg C year directly, if distributed as fine powder over land areas humid tropics, rate limited saturation concentration silicic acid. These upper limit rates come at environmental cost pH values in rivers 8.2 examples for Amazon and Congo. Open water fine-grained an alternative option, which might rise further. The secondary effects input acid connected with leads ecosystem model species shifts aways from calcifying towards diatoms, thus altering biological pumps. In summary, on biology lead higher theoretical limits given carbonate alone. We finally open 10 corresponding be interest light expected future emission (e.g. A2 scenario emissions 30 PgC/yr 2100 AD). Those still less until 2100, require nowadays available shipping capacity tankers bulk carriers entirely used ten times year.

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