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Full-Text Articles in Marine Biology
Observations On The Distribution Of Meroplankton During An Upwelling Event, Al Shanks, J Largier, J Brubaker
Observations On The Distribution Of Meroplankton During An Upwelling Event, Al Shanks, J Largier, J Brubaker
VIMS Articles
The distribution of the larvae of benthic invertebrates was investigated relative to hydrographic structures as a test of the hypothesi's that larvae behave as if they are passive particles. Observations of larval and oceanographic distributions were made off Duck, North Carolina, USA in August 1994. Conditions were characterized by wind-driven coastal upwelling;flow was generally offshore near the surface and onshore below the pycnocline. Within 5 km of the shore the pycnocline was bent upward by the upwelling and it intersected the surface along most of the transects. In zooplankton samples, 20 taxa of larvae were counted (10 bivalve veligers, nine …
Dissolved Organic Nitrogen: A Dynamic Participant In Aquatic Ecosystems, T Berman, Da Bronk
Dissolved Organic Nitrogen: A Dynamic Participant In Aquatic Ecosystems, T Berman, Da Bronk
VIMS Articles
In both marine and freshwaters, the concentration of dissolved organic nitrogen (DON) frequently exceeds that of dissolved inorganic nitrogen (DIN), including ammonium, nitrate, and nitrite. Recent evidence indicates that many organic N compounds are released into the DON pool and taken up from this pool by planktonic microbiota on timescales of hours to days. This observation suggests that many components of the DON pool can play an active role in supplying N nutrition directly or indirectly to phytoplankton and bacteria and, in so doing, may affect the species composition of the ambient microbial assemblage. Here we present an overview of …
Numerical Modeling Of Gravity-Driven Sediment Transport And Deposition On An Energetic Continental Shelf: Eel River, Northern California, M. Scully, Carl T. Friedrichs, L. D. Wright
Numerical Modeling Of Gravity-Driven Sediment Transport And Deposition On An Energetic Continental Shelf: Eel River, Northern California, M. Scully, Carl T. Friedrichs, L. D. Wright
VIMS Articles
A two-dimensional numerical model was applied to predict large-scale deposition by wave-supported sediment gravity flows on the Eel River continental shelf for four consecutive flood seasons using measured bathymetry, waves and river forcing. The model assumes that sediment-induced stratification maintains the near-bed Richardson number at its critical value, which determines the sediment carrying capacity of the wave boundary layer. Deposition is predicted when the gravity-driven flux of sediment exceeds the carrying capacity. The model predicted 26% of fine sediment discharged by the Eel River to be deposited on the midshelf with a magnitude and distribution largely consistent with field observations. …
Spectral Estimates Of Bed Shear Stress Using Suspended-Sediment Concentrations In A Wave-Current Boundary Layer, Guan-Hong Lee, W. Brian Dade, Carl T. Friedrichs, Chris E. Vincent
Spectral Estimates Of Bed Shear Stress Using Suspended-Sediment Concentrations In A Wave-Current Boundary Layer, Guan-Hong Lee, W. Brian Dade, Carl T. Friedrichs, Chris E. Vincent
VIMS Articles
High-resolution time series of suspended-sediment profiles have been obtained using an acoustic backscatter system at an inner shelf site (North Carolina) where flows are dominated by wind-driven currents and waves. We analyzed the spatial and temporal structure of near-bed turbulence in particle-transporting flows and scalar-like fluctuations of suspended-sediment concentrations. An important element of our analysis is a new inertial dissipation method for passive tracers to estimate the shear stress acting on the seabed, using the spectral properties of suspended sediment concentrations observed by acoustic backscatter sensors. In flows that provide adequate separation of the scales of turbulence production and dissipation, …