Impact of deep‐ocean carbon sequestration on atmospheric CO 2  and on surface‐water chemistry | Zendy

Harvey L. D. Danny | Zendy

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Impact of deep‐ocean carbon sequestration on atmospheric CO 2 and on surface‐water chemistry

Author(s) -

Harvey L. D. Danny

Publication year - 2003

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/2002gl016224

Subject(s) - carbon sequestration , environmental science , supersaturation , mixed layer , atmospheric sciences , carbon fibers , carbon cycle , atmospheric carbon cycle , carbon dioxide , environmental chemistry , climatology , chemistry , geology , materials science , ecosystem , organic chemistry , composite number , composite material , ecology , biology

The effectiveness of injection into the ocean of CO 2 produced from the use of fossil fuels is investigated using a coupled climate‐carbon cycle model. Four fossil fuel emission scenarios are considered, in which emissions peak at 28 Gt C/yr in 2100 (scenario 1), 9 Gt C/yr in 2050 (scenario 2), or decrease to zero by 2100 or 2075 (scenarios 3 and 4). Sequestration sufficient to reduce the net emissions for scenarios 1–3 to that in scenario 4 is considered. Sequestration in scenario 1 results in a CO 2 concentration of 857 ppmv by 3100, compared to a peak of 1614 ppmv without sequestration, and slows the accumulation of atmospheric CO 2 . The supersaturation of the non‐polar mixed layer with respect to calcite decreases from 486% pre‐industrial to about 250%, while mixed layer pH decreases by 0.66. Only for scenario 3 is sequestration sufficient to limit the peak impact on atmospheric CO 2 and mixed layer chemistry to the impacts obtained in scenario 4.

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