Sediment din fluxes and preferential recycling of benthic microalgal nitrogen in a shallow macrotidal estuary

Benthic algae control sediment–water column fluxes of organic and inorganic nitrogen compounds in a temperate lagoon

Coastal lagoons are a common land-margin feature worldwide and function as an important filter for nutrients entering from the watershed. The shallow nature of lagoons leads to dominance by benthic autotrophs, which can regulate benthic–pelagic coupling. Here we demonstrate that both microalgae and macroalgae are important in controlling dissolved inorganic as well as organic nitrogen (DIN and ...

Effects of cyanobacterial-driven pH increases on sediment nutrient fluxes and coupled nitrification-denitrification in a shallow fresh water estuary

Summer cyanobacterial blooms caused an elevation in pH (9 to ∼10.5) that lasted for weeks in the shallow and tidal-fresh region of the Sassafras River, a tributary of Chesapeake Bay (USA). Elevated pH promoted desorption of sedimentary inorganic phosphorus and facilitated conversion of ammonium (NH+4 ) to ammonia (NH3). In this study, we investigated pH effects on exchangeable NH+4 desorption, ...

Strong gradient of benthic biogeochemical processes along a macrotidal 1 temperate estuary : focus on P and Si cycles 2 3

12 13 This study aims to investigate the role of spatial and temporal physical, biological and 14 biogeochemical gradients on sediment biogeochemistry along a macrotidal and Si-rich estuary. 15 Scanning and biogeochemical analyses were performed in the inner, mid and outer Aulne Estuary 16 (France) at four seasons. The inner estuary shows high diagenetic activity linked to fluid mud 17 dynamics...

Strong gradient of benthic biogeochemical processes along a macrotidal temperate estuary: focus on P and Si cycles

High-resolution simulations of a macrotidal estuary using SUNTANS

The parallel, finite-volume, unstructured-grid SUNTANS model has been employed to study the interaction of the tides with complex bathymetry in the macrotidal Snohomish River estuary. The unstructured grid resolves the large-scale, O(10 km) tidal dynamics of the estuary while employing 8 m grid-resolution at a specific region of interest in the vicinity of a confluence of two channels and exten...