Articles | Volume 12, issue 1
Biogeosciences, 12, 67–78, 2015
https://doi.org/10.5194/bg-12-67-2015
Biogeosciences, 12, 67–78, 2015
https://doi.org/10.5194/bg-12-67-2015

Technical note 06 Jan 2015

Technical note | 06 Jan 2015

Technical Note: Large overestimation of pCO2 calculated from pH and alkalinity in acidic, organic-rich freshwaters

G. Abril et al.

Related authors

Denitrification and associated nitrous oxide and carbon dioxide emissions from the Amazonian wetlands
Jérémy Guilhen, Ahmad Al Bitar, Sabine Sauvage, Marie Parrens, Jean-Michel Martinez, Gwenael Abril, Patricia Moreira-Turcq, and José-Miguel Sánchez-Pérez
Biogeosciences, 17, 4297–4311, https://doi.org/10.5194/bg-17-4297-2020,https://doi.org/10.5194/bg-17-4297-2020, 2020
Short summary
Ideas and perspectives: Carbon leaks from flooded land: do we need to replumb the inland water active pipe?
Gwenaël Abril and Alberto V. Borges
Biogeosciences, 16, 769–784, https://doi.org/10.5194/bg-16-769-2019,https://doi.org/10.5194/bg-16-769-2019, 2019
Short summary
Carbon dynamics and CO2 and CH4 outgassing in the Mekong delta
Alberto V. Borges, Gwenaël Abril, and Steven Bouillon
Biogeosciences, 15, 1093–1114, https://doi.org/10.5194/bg-15-1093-2018,https://doi.org/10.5194/bg-15-1093-2018, 2018
Short summary
Spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central Amazon basin
R. L. Sobrinho, M. C. Bernardes, G. Abril, J.-H. Kim, C. I Zell, J.-M. Mortillaro, T. Meziane, P. Moreira-Turcq, and J. S. Sinninghe Damsté
Biogeosciences, 13, 467–482, https://doi.org/10.5194/bg-13-467-2016,https://doi.org/10.5194/bg-13-467-2016, 2016
Short summary
A strong CO2 sink enhanced by eutrophication in a tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)
L. C. Cotovicz Jr., B. A. Knoppers, N. Brandini, S. J. Costa Santos, and G. Abril
Biogeosciences, 12, 6125–6146, https://doi.org/10.5194/bg-12-6125-2015,https://doi.org/10.5194/bg-12-6125-2015, 2015
Short summary

Related subject area

Biogeochemistry: Rivers & Streams
Increased carbon capture by a silicate-treated forested watershed affected by acid deposition
Lyla L. Taylor, Charles T. Driscoll, Peter M. Groffman, Greg H. Rau, Joel D. Blum, and David J. Beerling
Biogeosciences, 18, 169–188, https://doi.org/10.5194/bg-18-169-2021,https://doi.org/10.5194/bg-18-169-2021, 2021
Short summary
Thermokarst amplifies fluvial inorganic carbon cycling and export across watershed scales on the Peel Plateau, Canada
Scott Zolkos, Suzanne E. Tank, Robert G. Striegl, Steven V. Kokelj, Justin Kokoszka, Cristian Estop-Aragonés, and David Olefeldt
Biogeosciences, 17, 5163–5182, https://doi.org/10.5194/bg-17-5163-2020,https://doi.org/10.5194/bg-17-5163-2020, 2020
Short summary
Soil organic carbon decomposition rates in river systems: effect of experimental conditions
Man Zhao, Liesbet Jacobs, Steven Bouillon, and Gerard Govers
Biogeosciences Discuss., https://doi.org/10.5194/bg-2020-267,https://doi.org/10.5194/bg-2020-267, 2020
Revised manuscript accepted for BG
Short summary
Temporary and net sinks of atmospheric CO2 due to chemical weathering in subtropical catchment with mixing carbonate and silicate lithology
Yingjie Cao, Yingxue Xuan, Changyuan Tang, Shuai Guan, and Yisheng Peng
Biogeosciences, 17, 3875–3890, https://doi.org/10.5194/bg-17-3875-2020,https://doi.org/10.5194/bg-17-3875-2020, 2020
Short summary
From canals to the coast: dissolved organic matter and trace metal composition in rivers draining degraded tropical peatlands in Indonesia
Laure Gandois, Alison M. Hoyt, Stéphane Mounier, Gaël Le Roux, Charles F. Harvey, Adrien Claustres, Mohammed Nuriman, and Gusti Anshari
Biogeosciences, 17, 1897–1909, https://doi.org/10.5194/bg-17-1897-2020,https://doi.org/10.5194/bg-17-1897-2020, 2020
Short summary

Cited articles

Åberg, J. and Wallin M. B.: Evaluating a fast headspace method for measuring DIC and subsequent calculation of pCO2 in freshwater systems, Inland Wat., 4, 157–166, 2014.
Abril, G., Guérin, F., Richard, S., Delmas, R., Galy-Lacaux, C., Gosse, P., Tremblay, A., Varfalvy, L., Dos Santos, M. A., and Matvienko, B.: Carbon dioxide and methane emissions and the carbon budget of a 10-year old tropical reservoir (Petit-Saut. French Guiana), Global Biogeochem. Cy., 19, GB4007, https://doi.org/10.1029/2005GB002457, 2005.
Abril, G., Richard, S., and Guérin, F.: In-Situ measurements of dissolved gases (CO2 and CH4) in a wide range of concentrations in a tropical reservoir using an equilibrator, Sc. Total Envir., 354, 246–251, 2006.
Barros, N., Cole, J. J., Tranvik L. J., Prairie Y. T., Bastviken D., Huszar V. L. M., del Giorgio P., and Roland F.: Carbon emission from hydroelectric reservoirs linked to reservoir age and latitude, Nat. Geosci.,4, 593–596, https://doi.org/10.1038/NGEO1211, 2011.
Download
Short summary
We compared pCO2 data calculated from pH and alkalinity from those measured directly in a large array of temperate and tropical freshwaters. This revealed a large overestimation (up to 300%) of calculated pCO2 in the case of acidic and organic-rich waters, due to a contribution of organic acids anions to alkalinity and a lower buffering capacity of the carbonate system at acidic pH. Given the widespread distribution of acidic freshwaters, direct measurements of water pCO2 are encouraged.
Altmetrics
Final-revised paper
Preprint