CO2 perturbation experiments: similarities and differences between dissolved inorganic carbon and total alkalinity manipulations.

Schulz, Kai, Barcelos e Ramos, Joana, Zeebe, R. E. and Riebesell, Ulf (2009) CO2 perturbation experiments: similarities and differences between dissolved inorganic carbon and total alkalinity manipulations. Open Access Biogeosciences (BG), 6 (10). pp. 2145-2153.

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Abstract

Increasing atmospheric carbon dioxide (CO2) through human activities and invasion of anthropogenic CO2 into the surface ocean alters the seawater carbonate chemistry, increasing CO2 and bicarbonate (HCO3−) at the expense of carbonate ion (CO32−) concentrations. This redistribution in the dissolved inorganic carbon (DIC) pool decreases pH and carbonate saturation state (Ω). Several components of the carbonate system are considered potential key variables influencing for instance calcium carbonate precipitation in marine calcifiers such as coccolithophores, foraminifera, corals, mollusks and echinoderms. Unravelling the sensitivities of marine organisms and ecosystems to CO2 induced ocean acidification (OA) requires well-controlled experimental setups and accurate carbonate system manipulations. Here we describe and analyse the chemical changes involved in the two basic approaches for carbonate chemistry manipulation, i.e. changing DIC at constant total alkalinity (TA) and changing TA at constant DIC. Furthermore, we briefly introduce several methods to experimentally manipulate DIC and TA. Finally, we examine responses obtained with both approaches using published results for the coccolithophore Emiliania huxleyi. We conclude that under most experimental conditions in the context of ocean acidification DIC and TA manipulations yield similar changes in all parameters of the carbonate system, which implies direct comparability of data obtained with the two basic approaches for CO2 perturbation.

Document Type: Article
Keywords: ocean acidification, experimental setup
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
Open Access Journal?: Yes
ISSN: 1726-4170
Projects: Future Ocean
Date Deposited: 14 Jan 2010 14:08
Last Modified: 19 Apr 2013 12:25
URI: http://oceanrep.geomar.de/id/eprint/3889

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