Modeling of phosphate flux induced by flood resuspension on a macrotidal estuarine mudflat (Seine, France) DOI Creative Commons

Jean-Marie Barrois,

Valérie Mesnage, Édouard Metzger

et al.

Marine Chemistry, Journal Year: 2024, Volume and Issue: 265-266, P. 104427 - 104427

Published: June 19, 2024

Coastal marine sediments can be either major scrubbers or eutrophication contributors to surface waters. Standard methods for direct measurement of nutrient fluxes at the sediment-water interface do not consider hydrodynamic forcing although several ex-situ studies suggest that sediment resuspension dramatically increase dissolved fluxes. We provide a new model quantify phosphate (PO43−) flux (JR) based on physical representation its identified components: diffusion stimulation by exposure deeper layer with higher PO43− concentration in porewater (JD), pore water mixing overlying (JM) and net adsorption/desorption from suspended (JK). This approach was applied field data Seine intertidal mudflat periodically submitted millimetric erosion. On tidal scale, output reveals JR 272.3 ± 360.0 μmol m−2 h−1 (± 52% parameter uncertainty), well above calculated application Fick's first law (0.15 0.85 h−1) ex situ core incubation (40.8 h−1). Iron bound phosphorus within suboxic layers buffers concentrations superficial leading negligible contributions JD JM total Conversely, JK appears main exchange pathway, even though improvements turbidity would allow this term defined more precisely. Correction required enhance control robustness are described. These results show importance considering dynamic environments.

Language: Английский

Organic matter determines the exchange of nutrients at sediment-water interface in coastal bays DOI

jiasen Zhong,

Ehui Tan,

Chunwei Fu

et al.

Acta Oceanologica Sinica, Journal Year: 2025, Volume and Issue: unknown

Published: April 15, 2025

Language: Английский

Citations

0
Effects of Frequent or Massive Sediment Supplies on Sediment Redox Dynamics: A Microcosm Simulation DOI
Corentin Guilhermic, Aurélia Mouret, Hélène Howa

et al.

Published: Jan. 1, 2025

Language: Английский

Citations

0
Biogeochemical cycling of manganese and iron in a macrotidal and hyperturbid estuary subject to flow-driven sedimentation DOI

Mohammed Barhdadi,

Aurélia Mouret, Christine Barras

et al.

Chemical Geology, Journal Year: 2024, Volume and Issue: 661, P. 122182 - 122182

Published: May 21, 2024

Language: Английский

Citations

1
Is reducing phosphorus inputs sufficient to reduce hypoxia in estuaries? The example of the Loire estuary DOI
Nour El Imene Boukortt, Sabine Schmidt, Aubin Thibault de Chanvalon

et al.

Estuarine Coastal and Shelf Science, Journal Year: 2024, Volume and Issue: unknown, P. 109110 - 109110

Published: Dec. 1, 2024

Language: Английский

Citations

1
Influence of manganese cycling on alkalinity in the redox stratified water column of Chesapeake Bay DOI Creative Commons
Aubin Thibault de Chanvalon, George W. Luther,

Emily R. Estes

et al.

Biogeosciences, Journal Year: 2023, Volume and Issue: 20(14), P. 3053 - 3071

Published: July 31, 2023

Abstract. The alkalinity dynamics in coastal environments play a crucial role controlling the global burial of carbonate minerals and ocean's capacity to sequester anthropogenic CO2. This study presents results from high vertical resolution profiles obtained during two summers temperate Chesapeake Bay estuary, enabling detailed investigation over salinity redox gradients, along with measurement speciation most redox-sensitive elements. Under oxygen-rich conditions, dissolution, primary production aerobic respiration explain evolution total (TA) versus dissolved inorganic carbon (DIC), once adjusted for fresh oceanic water mixing. A significant flooding event 2018 promoted dissolution. In oxygen-depleted waters, we observed previously unreported 2.4 mol increase DIC per 1 TA production, which was consistent 2 years. Stoichiometric changes suggest that MnO2 reduction followed by Mn precipitation is responsible this characteristic signature, likely produced sediment pore then transferred column other by-products anoxic at onset summer. Our findings highlight critical potentially river-dominated where it can limit H2S oxidation SO42- promote sulfur burial.

Language: Английский

Citations

2
Weekly variations of nutrients and their associations with phytoplankton blooms in the urban coastal waters of Andaman Sea coast: A case study in Patong Bay, Phuket, Thailand DOI Open Access
Thanakorn Jiwarungrueangkul,

Opnithi Kongpuen,

Chalermrat Sangmanee

et al.

Marine Pollution Bulletin, Journal Year: 2023, Volume and Issue: 198, P. 115824 - 115824

Published: Dec. 1, 2023

Language: Английский

Citations

1
Impact of Long-Term Nutrient Dynamics and Hydrology on the Current Biogeochemical Status of the Loire Estuary DOI
Nour El Imene Boukortt, Sabine Schmidt, Aubin Thibault de Chanvalon

et al.

Published: Jan. 1, 2024

Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI

Language: Английский

Citations

0
Modeling of phosphate flux induced by flood resuspension on a macrotidal estuarine mudflat (Seine, France) DOI Creative Commons

Jean-Marie Barrois,

Valérie Mesnage, Édouard Metzger

et al.

Marine Chemistry, Journal Year: 2024, Volume and Issue: 265-266, P. 104427 - 104427

Published: June 19, 2024

Coastal marine sediments can be either major scrubbers or eutrophication contributors to surface waters. Standard methods for direct measurement of nutrient fluxes at the sediment-water interface do not consider hydrodynamic forcing although several ex-situ studies suggest that sediment resuspension dramatically increase dissolved fluxes. We provide a new model quantify phosphate (PO43−) flux (JR) based on physical representation its identified components: diffusion stimulation by exposure deeper layer with higher PO43− concentration in porewater (JD), pore water mixing overlying (JM) and net adsorption/desorption from suspended (JK). This approach was applied field data Seine intertidal mudflat periodically submitted millimetric erosion. On tidal scale, output reveals JR 272.3 ± 360.0 μmol m−2 h−1 (± 52% parameter uncertainty), well above calculated application Fick's first law (0.15 0.85 h−1) ex situ core incubation (40.8 h−1). Iron bound phosphorus within suboxic layers buffers concentrations superficial leading negligible contributions JD JM total Conversely, JK appears main exchange pathway, even though improvements turbidity would allow this term defined more precisely. Correction required enhance control robustness are described. These results show importance considering dynamic environments.

Language: Английский

Citations

0