Fluxes of total mercury (Hg(T)) and monomethylmercury (MMHg) associated with submarine groundwater discharge (SGD) at two sites onthe central California coast were estimated by combining measurements of Hg(T) and MMHg in groundwater with the use of short-lived, naturally occurring radium isotopes as tracers of groundwater inputs. Concentrations of Hg(T) were relatively low, ranging from 1.2 to ...

Observations of the interactions of large amplitude internal seiches with the sloping boundary of Lake Simcoe, Canada show a pronounced asymmetry between up- and downwelling. Data were obtained during a 42-day period in late summer with an ADCP and an array of four thermistor chains located in a 5 km line at the depths where the thermocline intersects the shallow slope of the lakebed. The therm...

The activity of the benthos, including benthic plants, is important in driving the overall system dynamics in shallow lagoons, due to the high ratio of sediment surface area relative to water volume. In Hog Island Bay, benthic macroalgae appear to be a key regulator of DON dynamics, both while alive and following senescence. We investigated the role of macroalgae in mediating water column conce...

The relationship between particulate organic carbon (POC) concentrations measured in modern sediment and fluxes of exported POC to the sediment surface needs to be understood in order to use POC content as a proxy of paleo-environmental conditions. The objective of our study was to compare POC concentrations, POC mineralization rates calculated from O2 consumption and POC burial rates. Benthic ...

Abstract. Even though the effects of benthic fauna on aquatic biogeochemistry have been long recognized, few studies addressed combined animal bioturbation and metabolism ecosystem–level carbon nutrient dynamics. Here we merge a model (BMM) into physical–biogeochemical ecosystem (BALTSEM) to study long-term large-scale cycling in Baltic Sea. We include both direct faunal growth indirect its bio...

The contribution of sediments to nutrient cycling the coastal North Sea is strongly controlled by intensity fluxes across sediment water interface. Pore-water advection one major exchange mechanism that well described models, as it determined physical parameters. In contrast, biotransport (i.e., bioirrigation, bioturbation) other transport much more complex. Observational data reflecting biotra...

Thirteen Short sediment cores (30-50 cm) were collected from Bohai Sea, Yellow Sea and Changjiang Estuary in China, the early diagenesis of several redox sensitive metals (Fe, Mn, Mo, U V, referring to as RSMs) studied. The recycling process Mo Mn was closely correlated with each other, generating benthic fluxes diffusing upward overlying water column, flux rates are related organic carbon oxid...