Does eutrophication enhance greenhouse gas emissions in urbanized tropical estuaries ?

Nguyen, A. T.; Nemery, J.; /Gratiot, Nicolas; Dao, T. S.; Le, T. T. M.; /Baduel, Christine; Garnier, J.

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dc.creator	Nguyen, A. T.
dc.creator	Nemery, J.
dc.creator	/Gratiot, Nicolas
dc.creator	Dao, T. S.
dc.creator	Le, T. T. M.
dc.creator	/Baduel, Christine
dc.creator	Garnier, J.
dc.date	2022
dc.date.accessioned	2022-10-14T18:38:31Z
dc.date.available	2022-10-14T18:38:31Z
dc.identifier	https://www.documentation.ird.fr/hor/fdi:010085087
dc.identifier	oai:ird.fr:fdi:010085087
dc.identifier	Nguyen A. T., Nemery J., Gratiot Nicolas, Dao T. S., Le T. T. M., Baduel Christine, Garnier J.. Does eutrophication enhance greenhouse gas emissions in urbanized tropical estuaries ?. 2022, 303, p. 119105 [14 p.]
dc.identifier.uri	https://biblioteca-repositorio.clacso.edu.ar/handle/CLACSO/169938
dc.description	Estuaries are considered as important sources of the global emission of greenhouse gases (GHGs). Urbanized estuaries often experience eutrophication under strong anthropogenic activities. Eutrophication can enhance phytoplankton abundance, leading to carbon dioxide (CO2) consumption in the water column. Only a few studies have evaluated the relationship between GHGs and eutrophication in estuaries. In this study, we assessed the concentrations and fluxes of CO2, methane (CH4) and nitrous oxide (N2O) in combination with a suite of biogeochemical variables in four sampling campaigns over two years in a highly urbanized tropical estuary in Southeast Asia (the Saigon River Estuary, Vietnam). The impact of eutrophication on GHGs was evaluated through several statistical methods and interpreted by biological processes. The average concentrations of CO2, CH4 and N2O at the Saigon River in 2019-2020 were 3174 +/- 1725 mu gC-CO2 L-1, 5.9 +/- 16.8 mu gC-CH4 L-1 and 3.0 +/- 4.8 mu gN-N2O L-1, respectively. Their concentrations were 13-18 times, 52-332 times, and 9-37 times higher than the global mean concentrations of GHGs, respectively. While CO2 concentration had no clear seasonal pattern, N2O and CH(4 )concentrations significantly differed between the dry and the rainy seasons. The increase in eutrophication status along the dense urban area was linearly correlated with the increase in GHGs concentrations. The presence of both nitrification and denitrification resulted in elevated N2O concentrations in this urban area of the estuary. The high concentration of CO2 was contributed by the high concentration of organic carbon and mineralization process. GHGs fluxes at the Saigon River Estuary were comparable to other urbanized estuaries regardless of climatic condition. Control of eutrophication in urbanized estuaries through the implantation of efficient wastewater treatment facilities will be an effective solution in mitigating the global warming potential caused by estuarine emissions.
dc.language	EN
dc.subject	Biogeochemical processes
dc.subject	Carbon dioxide
dc.subject	Methane
dc.subject	Nitrous oxide
dc.subject	Saigon River
dc.subject	Urbanization
dc.subject	Vietnam
dc.title	Does eutrophication enhance greenhouse gas emissions in urbanized tropical estuaries ?
dc.type	text
dc.coverage	VIET NAM
dc.coverage	ZONE TROPICALE
dc.coverage	SAIGON COURS D'EAU