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3D modelling of summer hypoxia in a highly turbid urbanized macrotidal estuary, coupling hydrodynamics, sediment transport and biogeochemical processes ArchiMer
Lajaunie Salla, Katixa; Sottolichio, Aldo; Thouvenin, Benedicte; Litrico, Xavier; Abril, Gwenael.
Tipo: Text
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00292/40302/38751.pdf
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Divergent biophysical controls of aquatic CO2 and CH4 in the World's two largest rivers ArchiMer
Borges, Alberto V.; Abril, Gwenael; Darchambeau, Francois; Teodoru, Cristian R.; Deborde, Jonathan; Vidal, Luciana O.; Lambert, Thibault; Bouillon, Steven.
Carbon emissions to the atmosphere from inland waters are globally significant and mainly occur at tropical latitudes. However, processes controlling the intensity of CO2 and CH4 emissions from tropical inland waters remain poorly understood. Here, we report a data-set of concurrent measurements of the partial pressure of CO2 (pCO(2)) and dissolved CH4 concentrations in the Amazon (n = 136) and the Congo (n = 280) Rivers. The pCO(2) values in the Amazon mainstem were significantly higher than in the Congo, contrasting with CH4 concentrations that were higher in the Congo than in the Amazon. Large-scale patterns in pCO(2) across different lowland tropical basins can be apprehended with a relatively simple statistical model related to the extent of wetlands...
Tipo: Text
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00603/71528/69955.pdf
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Impact of urban effluents on summer hypoxia in the highly turbid Gironde Estuary, applying a 3D model coupling hydrodynamics, sediment transport and biogeochemical processes ArchiMer
Lajaunie-salla, Katixa; Wild-allen, Karen; Sottolichio, Aldo; Thouvenin, Benedicte; Litrico, Xavier; Abril, Gwenael.
Estuaries are increasingly degraded due to coastal urban development and are prone to hypoxia problems. The macro-tidal Gironde Estuary is characterized by a highly concentrated turbidity maximum zone (TMZ). Field observations show that hypoxia occurs in summer in the TMZ at low river flow and a few days after the spring tide peak. In situ data highlight lower dissolved oxygen (DO) concentrations around the city of Bordeaux, located in the upper estuary. Interactions between multiple factors limit the understanding of the processes controlling the dynamics of hypoxia. A 3D biogeochemical model was developed, coupled with hydrodynamics and a sediment transport model, to assess the contribution of the TMZ and the impact of urban effluents through wastewater...
Tipo: Text Palavras-chave: Hypoxia; TMZ; Gironde Estuary; Wastewater; Oxygen; Modeling.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00388/49903/50475.pdf
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Thermal enhancement of gas transfer velocity of CO2 in an Amazon floodplain lake revealed by eddy covariance measurements ArchiMer
Polsenaere, Pierre; Deborde, Jonathan; Detandt, Guillaume; Vidal, Luciana O.; Perez, Marcela A. P.; Marieu, Vincent; Abril, Gwenael.
In November 2011, the partial pressures of carbon dioxide (pCO(2)) in water and air in a floodplain lake of the Amazon River in Brazil were 800 +/- 75 and 387 +/- 8 ppmv, respectively. Turbulent CO2 fluxes from the lake measured with eddy covariance ranged from 0.05 to 2.2 mmol m(-2) s(-1). The corresponding gas transfer velocities k(600) ranged from 1.3 to 31.6 cm h(-1), averaging 12.2 +/- 6.7 cm h(-1). At moderate to high wind speed, k(600) increased with wind speed, with values above parameterizations for other lake ecosystems. During the prevailing tropical low wind speed (below 2.7 m s(-1)) and high insolation conditions, unexpected high k(600) values (up to 20 cm h(-1)) were obtained and correlated with latent heat and sensible heat fluxes. In...
Tipo: Text
Ano: 2013 URL: https://archimer.ifremer.fr/doc/00603/71532/69950.pdf
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