Abstract：
:Ocean uptake of anthropogenic CO2 reduces pH and saturation state of calcium carbonate materials of seawater, which could reduce the calcification rate of some marine organisms, triggering a negative feedback on the growth of atmospheric CO2. We quantify the effect of this CO2-calcification feedback by conducting a series of Earth system model simulations that incorporate different parameterization schemes describing the dependence of calcification rate on saturation state of CaCO3. In a scenario with SRES A2 CO2 emission until 2100 and zero emission afterwards, by year 3500, in the simulation without CO2-calcification feedback, model projects an accumulated ocean CO2 uptake of 1462 PgC, atmospheric CO2 of 612 ppm, and surface pH of 7.9. Inclusion of CO2-calcification feedback increases ocean CO2 uptake by 9 to 285 PgC, reduces atmospheric CO2 by 4 to 70 ppm, and mitigates the reduction in surface pH by 0.003 to 0.06, depending on the form of parameterization scheme used. It is also found that the effect of CO2-calcification feedback on ocean carbon uptake is comparable and could be much larger than the effect from CO2-induced warming. Our results highlight the potentially important role CO2-calcification feedback plays in ocean carbon cycle and projections of future atmospheric CO2 concentrations.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Zhang H,Cao Ldoi
10.1038/srep20284subject
Has Abstractpub_date
2016-02-03 00:00:00pages
20284issn
2045-2322pii
srep20284journal_volume
6pub_type
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journal_title：Scientific reports
pub_type： 杂志文章
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pub_type： 杂志文章
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更新日期：2016-09-08 00:00:00
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pub_type： 杂志文章,已发布勘误
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更新日期：2017-06-30 00:00:00
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journal_title：Scientific reports
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