 |
| Titel |
CO2 perturbation experiments: similarities and differences between dissolved inorganic carbon and total alkalinity manipulations |
| VerfasserIn |
K. G. Schulz, J. Barcelos e Ramos, R. E. Zeebe, U. Riebesell |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 10 ; Nr. 6, no. 10 (2009-10-09), S.2145-2153 |
| Datensatznummer |
250004036
|
| Publikation (Nr.) |
 copernicus.org/bg-6-2145-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|