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| Titel |
Revisiting four scientific debates in ocean acidification research |
| VerfasserIn |
A. J. Andersson, F. T. Mackenzie |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 3 ; Nr. 9, no. 3 (2012-03-01), S.893-905 |
| Datensatznummer |
250006832
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| Publikation (Nr.) |
 copernicus.org/bg-9-893-2012.pdf |
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| Zusammenfassung |
| In recent years, ocean acidification has gained continuously increasing
attention from scientists and a number of stakeholders and has raised
serious concerns about its effects on marine organisms and ecosystems. With
the increase in interest, funding resources, and the number of scientific
investigations focusing on this environmental problem, increasing amounts of
data and results have been produced, and a progressively growing and more
rigorous understanding of this problem has begun to develop. Nevertheless,
there are still a number of scientific debates, and in some cases
misconceptions, that keep reoccurring at a number of forums in various
contexts. In this article, we revisit four of these topics that we think
require further thoughtful consideration including: (1) surface seawater
CO2 chemistry in shallow water coastal areas, (2) experimental
manipulation of marine systems using CO2 gas or by acid addition, (3)
net versus gross calcification and dissolution, and (4) CaCO3 mineral
dissolution and seawater buffering. As a summation of these topics, we
emphasize that: (1) many coastal environments experience seawater pCO2
that is significantly higher than expected from equilibrium with the
atmosphere and is strongly linked to biological processes; (2) addition of
acid, base or CO2 gas to seawater can all be useful techniques to
manipulate seawater chemistry in ocean acidification experiments; (3)
estimates of calcification or CaCO3 dissolution based on present
techniques are measuring the net of gross calcification and dissolution; and
(4) dissolution of metastable carbonate mineral phases will not produce
sufficient alkalinity to buffer the pH and carbonate saturation state of
shallow water environments on timescales of decades to hundreds of years to
the extent that any potential negative effects on marine calcifiers will be
avoided. |
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