Carbon dioxide in water and seawater: the solubility of a non-ideal gas

Weiss, Ray F.

doi:10.1016/0304-4203(74)90015-2

Cited by 2,908 publications

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“…pCO 2 of ambient air (pCO 2air ) was also measured by the IRGA. Surface water CO 2 concentration (C sur ) and the saturation concentration of CO 2 (C sat ) were calculated from measured pCO 2 s and Henry's constant at ambient temperature (K H ) according to Henry's law (Weiss, 1974) (Equation 1 and 2):…”

Section: Sampling and Calculationsmentioning

confidence: 99%

Diurnal sampling reveals significant variation in CO2 emission from a tropical productive lake

Reis

Barbosa

2014

Braz. J. Biol.

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It is well accepted in the literature that lakes are generally net heterotrophic and supersaturated with CO 2 because they receive allochthonous carbon inputs. However, autotrophy and CO 2 undersaturation may happen for at least part of the time, especially in productive lakes. Since diurnal scale is particularly important to tropical lakes dynamics, we evaluated diurnal changes in pCO 2 and CO 2 flux across the air-water interface in a tropical productive lake in southeastern Brazil (Lake Carioca) over two consecutive days. Both pCO 2 and CO 2 flux were significantly different between day (9:00 to 17:00) and night (21:00 to 5:00) confirming the importance of this scale for CO 2 dynamics in tropical lakes. Net heterotrophy and CO 2 outgassing from the lake were registered only at night, while significant CO 2 emission did not happen during the day. Dissolved oxygen concentration and temperature trends over the diurnal cycle indicated the dependence of CO 2 dynamics on lake metabolism (respiration and photosynthesis). This study indicates the importance of considering the diurnal scale when examining CO 2 emissions from tropical lakes.Keywords: pCO 2 , CO 2 flux, diurnal variations, tropical productive lake.Amostragem diurna demonstra variação significativa na emissão de CO 2 em um lago tropical produtivo Resumo É amplamente aceito na literatura que lagos são em geral heterotróficos e supersaturados com CO 2 já que recebem carbono alóctone. Porém, autotrofia e insaturação de CO 2 podem ocorrer em pelo menos parte do tempo, especialmente em lagos produtivos. Como a escala diurna é particularmente importante para a dinâmica de lagos tropicais, variações diurnas na pCO 2 e no fluxo de CO 2 através da interface ar-água foram avaliadas num lago tropical produtivo do sudeste do Brasil (Lagoa Carioca) durante dois dias consecutivos. Tanto a pCO 2 quanto o fluxo de CO 2 foram significativamente diferentes entre o dia (9:00 às 17:00) e a noite (21:00 às 5:00), confirmando a influência desta escala na dinâmica do CO 2 na Lagoa Carioca. Foram registradas heterotrofia e emissão de CO 2 pela lagoa apenas durante a noite, enquanto durante o dia não houve emissão significativa. Variações na concentração de oxigênio dissolvido e na temperatura ao longo do dia indicaram a dependência da dinâmica do CO 2 no metabolismo (respiração e fotossíntese) deste lago. Este estudo indica a importância de se considerar a escala diurna na avaliação da emissão de CO 2 por lagos tropicais.Palavras-chave: pCO 2 , fluxo de CO 2 , variações diurnas, lago tropical produtivo.

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Section: Sampling and Calculationsmentioning

confidence: 99%

Diurnal sampling reveals significant variation in CO2 emission from a tropical productive lake

Reis

Barbosa

2014

Braz. J. Biol.

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“…is the DIC value, {H} = 10-pH, K, is the solubility constant (Weiss 1974), and K, and K2 are the dissociation constants of carbonic acid. There are presently several sets of K, and K, values available for use.…”

Section: Resultsmentioning

confidence: 99%

The chemistry, fluxes, and sources of carbon dioxide in the estuarine waters of the Satilla and Altamaha Rivers, Georgia

Cai

Wang

1998

Limnology & Oceanography

491

325

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The pH, alkalinity (Alk), and dissolved inorganic carbon (DIC) in estuarine waters of several rivers of Georgia in the southeastern United States are reported. Although they discharge into a narrow area in the South Atlantic Bight, the rivers along the coast of Georgia differ significantly in their drainage area (Piedmont rivers vs. coastal plain rivers), chemical composition (contents of carbonate and humics), and discharge rates. Large differences in pH, DIC, and Alk between these rivers clearly reflect the differences of material inputs to the rivers. Dramatic pH increases in the early stage of mixing (more obvious for the coastal plain rivers) reflect the low buffering capacity of the river waters despite the high content of humic substances. Flux of riverine DIC to the South Atlantic Bight is estimated to be 52.5 X lo9 mol yr-*. We suggest that the presently available world total riverine DIC flux to the ocean could have much uncertainty if the small river fluxes are important. Calculated pC0, values from the pH and DIC measurements are extremely high in low-salinity areas (1,000 to >6,000 patm at salinity < 10) as are the corresponding CO, fluxes to the atmosphere (20 to >250 mol m-* yr-I at salinity

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“…The solubility (α) of 262 CO 2 in sea water depends on surface temperature (T) and salinity (S) (Weiss, 1974) as 263…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Physical and biological response of the Arabian Sea to tropical cyclone Phyan and its implications

Byju

Kumar

2011

Marine Environmental Research

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Carbon dioxide in water and seawater: the solubility of a non-ideal gas

Cited by 2,908 publications

References 10 publications

Diurnal sampling reveals significant variation in CO2 emission from a tropical productive lake

Diurnal sampling reveals significant variation in CO2 emission from a tropical productive lake

The chemistry, fluxes, and sources of carbon dioxide in the estuarine waters of the Satilla and Altamaha Rivers, Georgia

Physical and biological response of the Arabian Sea to tropical cyclone Phyan and its implications

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