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| Titel |
Implications of observed inconsistencies in carbonate chemistry measurements for ocean acidification studies |
| VerfasserIn |
C. J. M. Hoppe, G. Langer, S. D. Rokitta, D. A. Wolf-Gladrow, B. Rost |
| 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. 7 ; Nr. 9, no. 7 (2012-07-03), S.2401-2405 |
| Datensatznummer |
250007175
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| Publikation (Nr.) |
 copernicus.org/bg-9-2401-2012.pdf |
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| Zusammenfassung |
| The growing field of ocean acidification research is concerned with the
investigation of organism responses to increasing pCO2 values. One
important approach in this context is culture work using seawater with
adjusted CO2 levels. As aqueous pCO2 is difficult to measure
directly in small-scale experiments, it is generally calculated from two
other measured parameters of the carbonate system (often AT,
CT or pH). Unfortunately, the overall uncertainties of measured and
subsequently calculated values are often unknown. Especially under high
pCO2, this can become a severe problem with respect to the
interpretation of physiological and ecological data. In the few datasets from
ocean acidification research where all three of these parameters were
measured, pCO2 values calculated from AT and CT are
typically about 30% lower (i.e. ~300 μatm at a target
pCO2 of 1000 μatm) than those calculated from AT and
pH or CT and pH. This study presents and discusses these discrepancies
as well as likely consequences for the ocean acidification community. Until
this problem is solved, one has to consider that calculated parameters of the
carbonate system (e.g. pCO2, calcite saturation state) may not be
comparable between studies, and that this may have important implications for
the interpretation of CO2 perturbation experiments. |
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