Carbon Dynamics Along the Seine River Network: Insight From a Coupled Estuarine/River Modeling Approach

Laruelle, Goulven Gildas; Marescaux, Audrey; Gendre, Romain Le; Garnier, Josette; Thieu, Vincent

doi:10.3389/fmars.2019.00216

Cited by 11 publications

(22 citation statements)

References 64 publications

(100 reference statements)

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“…fluxes between different reservoirs: atmosphere, biosphere, hydrosphere and lithosphere (e.g., Bern-SAR, Joos et al, 1996;ACC2, Tanaka et al, 2007;TOTEM, Mackenzie et al, 2011;MAGICC6, Meehl et al, 2007). In addition to these box approaches, a number of more comprehensive mechanistic models, describing biogeochemical processes involved in carbon cycling and CO 2 evasion, have been set up for oceans (e.g., Doney et al, 2004;Aumont et al, 2015), coastal waters (e.g., Borges et al, 2006;Gypens et al, 2004Gypens et al, , 2009Gypens et al, , 2011 and estuaries (e.g., Cai and Wang, 1998;Volta et al, 2014, Laruelle et al, 2019. In inland waters, the NICE-BGC model (Nakayama, 2016) accurately represents CO 2 evasion at the global scale.…”

Section: Introductionmentioning

confidence: 99%

“…A further aim in newly implementing this CO module was to quantify and discuss autotrophy versus heterotrophy patterns in regard to CO 2 concentrations and supersaturation in the drainage network. In future works, a systematic coupling with an estuary model could enable to accurately calculate carbon delivery fluxes to the ocean as already proposed for the year 2010 by Laruelle et al (2019).…”

Section: Introductionmentioning

confidence: 99%

“…Higher concentrations of CO 2 downstream of Paris, and a peak of CO 2 concentrations immediately downstream of the SAV WWTP werefollowed by a progressive decrease until the estuary (Figure 5). Note that the estuarine CO 2 concentrations were specifically modeled inLaruelle et al (2019), using these outputs of the Riverstrahler simulations.…”

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confidence: 99%

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Modeling inorganic carbon dynamics in the Seine River continuum in France

Marescaux¹,

Thieu²,

Gypens³

et al. 2019

Preprint

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Abstract. Inland waters have been recognized as an active component of the carbon cycle where transformations and transports are associated with carbon dioxide (CO2) outgassing. We propose a modeling approach by formalizing an inorganic carbon module integrated into the biogeochemical model, pyNuts-Riverstrahler, to estimate the carbon fate in the aquatic continuum. Our approach was implemented on the human-impacted Seine River (France) taking into account point sources (including the largest wastewater treatment plant in Europe, reaching a treatment capacity of 6 106 inhab eq), and diffuse constraints to the model. Both sources were characterized by field measurements in groundwater and in wastewater treatment plants, and by existing databases. In average, we calculated DIC concentrations from 25 to 92 mgC L−1 depending of the aquifers while in WWTP effluents our measurements of DIC averaged 70 mgC L−1. On the period studied (2010–2013), yearly averaged simulated CO2 emissions from the hydrosystem were estimated at 364 ± 99 Gg C yr−1. Simulations of dissolved inorganic carbon, total alkalinity, pH and CO2 concentrations showed good agreement with observations, and seasonal variability could be reproduced. Metabolism in the Seine hydrographic network highlighted the importance of benthic activities in small head streams while planktonic activities were mainly observed downstream in larger rivers. In contrast to the 1990s, the net ecosystem productivity remained negative throughout all the years and at every place within the river network, highlighting the heterotrophy of the basin. In parallel, CO2 supersaturation with respect to atmospheric concentrations of the basin was shown. Outgassing was the most important in lower order streams while peaks were simulated downstream of the major wastewater treatment effluent.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling inorganic carbon dynamics in the Seine River continuum in France

Marescaux¹,

Thieu²,

Gypens³

et al. 2019

Preprint

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“…Indeed, modeling approaches have made it possible to simulate and quantify carbon fluxes between different reservoirs: atmosphere, biosphere, hydrosphere and lithosphere (e.g., Bern-SAR, Joos et al, 1996;ACC2, Tanaka et al, 2007;TOTEM, Mackenzie et al, 2011;MAGICC6, Meehl et al, 2007). In addition to these box approaches, a number of more comprehensive mechanistic models, describing biogeochemical processes involved in carbon cycling and CO 2 evasion, have been set up for oceans (e.g., Doney et al, 2004;Aumont et al, 2015), coastal waters (e.g., Borges et al, 2006;Gypens et al, 2004Gypens et al, , 2009Gypens et al, , 2011 and estuaries (e.g., Cai and Wang, 1998;Volta et al, 2014;Laruelle et al, 2019). In inland waters, the NICE-BGC model (Nakayama, 2016) accurately represents CO 2 evasion at the global scale.…”

mentioning

confidence: 99%

“…The Seine River (northwestern France) has long been studied using the biogeochemical riverine Riverstrahler model (Billen et al, 1994;Garnier et al, 1995), a generic model of water quality and biogeochemical functioning of large river systems. For example, the model has made it possible to quantify deliveries to the coastal zone and understand eutrophication phenomena Billen et al, 2001;Passy et al, 2016;Garnier et al, 2019), nitrogen transformation and N 2 O emissions (Garnier et al, , 2009Vilain et al, 2012) as well as nitrate retention Billen et al, 2018), and the organic carbon metabolism Vilmin et al, 2016). It is only recently that we investigated pCO 2 and emphasized the factors controlling pCO 2 dynamics in the Seine River (Marescaux et al, 2018b) or its estuary (Laruelle et al, 2019).…”

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confidence: 99%

Modeling inorganic carbon dynamics in the Seine River continuum in France

Marescaux

Thieu

Gypens³

et al. 2020

Hydrol. Earth Syst. Sci.

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Abstract. Inland waters are an active component of the carbon cycle where transformations and transports are associated with carbon dioxide (CO2) outgassing. This study estimated CO2 emissions from the human-impacted Seine River (France) and provided a detailed budget of aquatic carbon transfers for organic and inorganic forms, including the in-stream metabolism along the whole Seine River network. The existing process-based biogeochemical pyNuts-Riverstrahler model was supplemented with a newly developed inorganic carbon module and simulations were performed for the recent time period 2010–2013. New input constraints for the modeling of riverine inorganic carbon were documented by field measurements and complemented by analysis of existing databases. The resulting dissolved inorganic carbon (DIC) concentrations in the Seine aquifers ranged from 25 to 92 mg C L−1, while in wastewater treatment plant (WWTP) effluents our DIC measurements averaged 70 mg C L−1. Along the main stem of the Seine River, simulations of DIC, total alkalinity, pH and CO2 concentrations were of the same order of magnitude as the observations, but seasonal variability was not always well reproduced. Our simulations demonstrated the CO2 supersaturation with respect to atmospheric concentrations over the entire Seine River network. The most significant outgassing was in lower-order streams while peaks were simulated downstream of the major WWTP effluent. For the period studied (2010–2013), the annual average of simulated CO2 emissions from the Seine drainage network were estimated at 364±99 Gg C yr−1. Results from metabolism analysis in the Seine hydrographic network highlighted the importance of benthic activities in headwaters while planktonic activities occurred mainly downstream in larger rivers. The net ecosystem productivity remained negative throughout the 4 simulated years and over the entire drainage network, highlighting the heterotrophy of the basin. Highlights CO2 emission from the Seine River was estimated at 364±99 Gg C yr−1 with the Riverstrahler model. CO2 riverine concentrations are modulated by groundwater discharge and instream metabolism. CO2 emissions account for 31 % of inorganic carbon exports, the rest being exported as DIC.

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Carbon Dynamics in the Estuaries and Continental Shelves of Indian Ocean

Akhand

Chanda

2022

Blue Carbon Dynamics of the Indian Ocean

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Carbon Dynamics Along the Seine River Network: Insight From a Coupled Estuarine/River Modeling Approach

Cited by 11 publications

References 64 publications

Modeling inorganic carbon dynamics in the Seine River continuum in France

Modeling inorganic carbon dynamics in the Seine River continuum in France

Modeling inorganic carbon dynamics in the Seine River continuum in France

Carbon Dynamics in the Estuaries and Continental Shelves of Indian Ocean

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