Seasonal Variability of Carbon Dioxide in the Rivers and Lagoons of Ivory Coast (West Africa)

Koné, Y. J. M.; Abril, Gwénaël; Kouadio, Kouakou Norbert; Delille, Bruno; Borges, Alberto

doi:10.1007/s12237-008-9121-0

Cited by 106 publications

(112 citation statements)

References 38 publications

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“…Thus their approach was a major improvement for scaling of CO 2 fluxes, because it was known that carbon was transformed differently according to estuarine types. For example, recent comparisons have been made between stratified fjords and wellmixed macro-tidal estuaries (Borges 2005) and stratified and well-mixed lagoons (Koné et al 2008). Laruelle et al (2010) scaled up the inner estuarine CO 2 fluxes using the following four estuarine types: small deltas and estuaries (8% of total surface), tidal systems and embayments (26% of total surface), lagoons (24% of total surface), and fjords and fjärds (43% of total surface).…”

Section: Co 2 Degassing Flux In Inner Estuariesmentioning

confidence: 99%

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Cai

Chen²,

Borges³

2013

Biogeochemical Dynamics at Major River-Coastal Interfaces

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Section: Co 2 Degassing Flux In Inner Estuariesmentioning

confidence: 99%

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Cai

Chen²,

Borges³

2013

Biogeochemical Dynamics at Major River-Coastal Interfaces

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“…The Grand-Lahou lagoon system and the Ebrié lagoon system fall under the ecotype of ''restricted lagoons'' while the Aby lagoon system falls under the ecotype of ''chocked lagoons'' based on the classification of Kjerfve (1985). Chocked lagoons are connected to the sea by a very shallow channel hence there is a low propagation of marine tidal and wave energy, unlike restricted lagoons that are connected to the sea by deeper channels.…”

Section: Description Of Study Areamentioning

confidence: 99%

Seasonal variability of methane in the rivers and lagoons of Ivory Coast (West Africa)

et al. 2010

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We report a data-set of dissolved methane (CH 4 ) in three rivers (Comoé, Bia and Tanoé) and five lagoons (Grand-Lahou, Ebrié, Potou, Aby and Tendo) of Ivory Coast (West Africa), during the four main climatic seasons (high dry season, high rainy season, low dry season and low rainy season). The surface waters of the three rivers were over-saturated in CH 4 with respect to atmospheric equilibrium (2221-38719%), and the seasonal variability of CH 4 seemed to be largely controlled by dilution during the flooding period. The strong correlation of CH 4 concentrations with the partial pressure of CO 2 (pCO 2 ) and dissolved silicate (DSi) confirm the dominance of a continental sources (from soils) for both CO 2 and CH 4 in these rivers. Diffusive air-water CH 4 fluxes ranged between 25 and 1187 lmol m -2 day -1 , and annual integrated values were 288 ± 107, 155 ± 38, and 241 ± 91 lmol m -2 day -1 in the Comoé, Bia and Tanoé rivers, respectively. In the five lagoons, surface waters were also over-saturated in CH 4 (ranging from 1496 to 51843%). Diffusive air-water CH 4 fluxes ranged between 20 and 2403 lmol m -2 day -1 , and annual integrated values were 78 ± 34, 338 ± 217, 227 ± 79, 330 ± 153 and 326 ± 181 lmol m -2 day -1 in the Grand-Lahou, Ebrié, Potou, Aby and Tendo lagoons, respectively. The largest CH 4 oversaturations were observed in the Tendo and Aby lagoons that are permanently stratified systems (unlike the other three lagoons), leading to anoxic bottom waters favorable for a large CH 4 production. In addition, these two stratified lagoons showed low pCO 2 values due to high primary production, which suggests an efficient transfer of organic matter across the pycnocline. As a result, the stratified Tendo and Aby lagoons were respectively, a low source of CO 2 to the atmosphere and a sink of atmospheric CO 2 while the other three well-mixed lagoons were strong sources of CO 2 to the atmosphere but less oversaturated in CH 4 .

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“…Other human impacts that affect carbon and nitrogen cycling in river networks that can potentially influence cycling of GHGs are river bank stabilization and floodplain drainage that disrupt the river-wetland connectivity that is important for CO 2 and CH 4 dynamics in rivers (Abril et al, 2014;Teodoru et al, 2015;Borges et al, 2015aBorges et al, , 2015bSieczko et al, 2016). The introduction of invasive animal species such as the zebra mussel (Dreissena polymorpha) in US rivers and lakes (Caraco et al, 1997;Evans et al, 2011) (Hussner, 2012), some with high production and biomass (Hussner, 2009); invasive floating macrophytes such as the water hyacinth (Eichhornia crassipes) have been documented to increase CO 2 and CH 4 levels in tropical rivers (Koné et al, 2009(Koné et al, , 2010, but this remains undocumented in temperate rivers.…”

Section: Introductionmentioning

confidence: 99%

Effects of agricultural land use on fluvial carbon dioxide, methane and nitrous oxide concentrations in a large European river, the Meuse (Belgium)

Borges

Darchambeau

Lambert

et al. 2018

Science of The Total Environment

159

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• Large data-set of CO 2 , CH 4 , and N 2 O in the surface waters of the Meuse River We report a data-set of CO 2 , CH 4 , and N 2 O concentrations in the surface waters of the Meuse river network in Belgium, obtained during four surveys covering 50 stations (summer 2013 and late winter 2013, 2014 and 2015), from yearly cycles in four rivers of variable size and catchment land cover, and from 111 groundwater samples. Surface waters of the Meuse river network were over-saturated in CO 2 , CH 4 , N 2 O with respect to atmospheric equilibrium, acting as sources of these greenhouse gases to the atmosphere, although the dissolved gases also showed marked seasonal and spatial variations. Seasonal variations were related to changes in freshwater discharge following the hydrological cycle, with highest concentrations of CO 2 , CH 4 , N 2 O during low water owing to a longer water residence time and lower currents (i.e. lower gas transfer velocities), both contributing to the accumulation of gases in the water column, combined with higher temperatures favourable to microbial processes. Inter-annual differences of discharge also led to differences in CH 4 and N 2 O that were higher in years with prolonged low water periods. Spatial variations were mostly due to differences in land cover over the catchments, with systems dominated by agriculture (croplands and pastures) having higher CO 2 , CH 4 , N 2 O levels than forested systems. This seemed to be related to higher levels of dissolved and particulate organic matter, as well as dissolved inorganic nitrogen in agriculture dominated systems compared to forested ones. Groundwater had very low CH 4 concentrations in the shallow and unconfined aquifers (mostly fractured limestones) of the Contents lists available at ScienceDirectScience of the Total Environment j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / s c i t o t e n vMeuse basin, hence, should not contribute significantly to the high CH 4 levels in surface riverine waters. Owing to high dissolved concentrations, groundwater could potentially transfer important quantities of CO 2 and N 2 O to surface waters of the Meuse basin, although this hypothesis remains to be tested.

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Seasonal Variability of Carbon Dioxide in the Rivers and Lagoons of Ivory Coast (West Africa)

Cited by 106 publications

References 38 publications

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Seasonal variability of methane in the rivers and lagoons of Ivory Coast (West Africa)

Effects of agricultural land use on fluvial carbon dioxide, methane and nitrous oxide concentrations in a large European river, the Meuse (Belgium)

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