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- W2015775488 abstract "In ocean waters, the carbonate ion is of crucial importance to benthic and pelagic organisms that build their physical support structures out of calcium carbonate (CaCO3). Marine carbonate ion concentrations ([CO32−]) are measurable through spectrophotometric observations of the ultraviolet (UV) light absorbed by lead carbonate in Pb-enriched seawater, but previous characterizations of the UV-absorption model were applicable only at a fixed temperature of 25 °C. In this paper, the model is extended to a temperature range of 3 to 40 °C and a salinity range of 20 to 40. This advancement allows for determinations of [CO32−] with temperature measurement rather than temperature control, thus decreasing the required financial investment and instrumental complexity. The extended model also represents a significant step toward the development of automated inline or in situ [CO32−] sensors and promotes the utility of [CO32−] as a fifth measured variable for inclusion in studies of the marine carbon dioxide (CO2) system. A quantitative evaluation of propagated uncertainties in CO2 system calculations based on measured [CO32−] as an input variable was also performed. The results show that total dissolved inorganic carbon (CT) and total alkalinity (AT) are the most suitable measurable variables to pair with measured [CO32−] as input to such calculations. Pairing [CO32−] with the partial pressure of CO2 yields relatively low uncertainty in calculated pH — comparable to that resulting from conventional input pairs — but relatively high uncertainties in calculated AT and CT. Pairing [CO32−] with pH results in relatively high uncertainties in all calculated variables. CaCO3 saturation states (Ω) determined from measured [CO32−] (alone) can circumvent some sources of uncertainty inherent to conventional (two-variable) calculations. Simpler, more direct ways of measuring [CO32−] open up new opportunities for marine researchers and others interested in monitoring CaCO3 saturation states in seawater." @default.
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- W2015775488 date "1892-05-01" @default.
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- W2015775488 title "Stated meeting, held Tuesday, April S, 2892" @default.
- W2015775488 doi "https://doi.org/10.1016/0016-0032(92)90282-l" @default.
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