Physical Sciences and Mathematics Commons^™

Chemical And Toxicological Characterization Of The Lower Mobjack Bay, York River, Virginia Segment Of The Chesapeake Bay, Morris H. Roberts Jr., Mark A. Richards, Peter F. Delisle

Reports

The Chesapeake Bay segment called Lower Mobjack Bay Lower York River Virginia was found to have insufficient data to characterize in 1999. Therefore this area was selected for a chemical, toxicological, benthic community characterization study of the sediments in 2002. The segment was divided into 3 strata: the lower York River, the Poquoson River, and Back River, each with 4 randomly selected stations. Samples were collected in October 2002 for evaluation of conditions.

There were few significant chemical exceedances of the ER-L or ER-M in the three strata and no toxicologically effects from exposure to sediment samples from any stratum. …

Benthic Algae Control Sediment-Water Column Fluxes Of Organic And Inorganic Nitrogen Compounds In A Temperate Lagoon, Ac Tyler, Kj Mcglathery, Iris C. Anderson

VIMS Articles

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 DON) fluxes between the sediments and the water column. Fluxes of nitrogen (NH4+, NO3-, DON, urea, and dissolved free and combined amino acids [DFAA, DCAA]) and O-2 were measured from October 1998 through August 1999 in sediment cores collected from Hog Island Bay, …

Modeling Sediment Transport In The York River : Final Report, Jerome P.-Y. Maa

Reports

Numerical simulation on the formation of an Estuarine Turbidity Maximum (ETM) is a difficult task because of the incomplete knowledge on cohesive sediment transport. For example, it is difficult to well simulate the erosion process when the bed erosion properties are only poorly known. It is also hard to simulate the settling process when the bulk density and size of suspended sediment flocs are changing with the ambient environments.

Despite of the difficulties, some processes can be parametricalized, even not perfectly, to make the simulation results close to observed. In this project, we demonstrated the possibility of using a constant …

Penetration Of Anthropogenic Carbon Into Organic Particles Of The Deep Ocean, Erm Druffel, Je Bauer, S Griffin, J Hwang

VIMS Articles

] In the late 1980s, bomb C-14 was present in suspended particulate organic carbon (POC) from the North Central Pacific (NCP) and Sargasso Sea ( SS) throughout most of the water column, demonstrating that deep POC had exchanged with atmospheric CO2 in the past 30 years. Upon reoccupation of these sites in 1999 and 2000, respectively, we observed that the delta(13)C values of suspended POC were lower than those measured a decade earlier. This demonstrates that anthropogenic CO2 from fossil fuel and biomass burning has penetrated a major organic matter pool in the deep ocean. Delta(14)C measured in the suspended …

Transport Of Dissolved Inorganic Carbon From A Tidal Freshwater Marsh To The York River Estuary, Sc Neubauer, Iris C. Anderson

VIMS Articles

The cycling of dissolved inorganic carbon (DIC) and the role of tidal marshes in estuarine DIC dynamics were studied in a Virginia tidal freshwater marsh and adjacent estuary. DIC was measured over diurnal cycles in different seasons in a marsh tidal creek and at the junction of the creek with the adjacent Pamunkey River. In the creek, DIC concentrations around high tide were controlled by the same processes affecting whole-estuary DIC gradients. Near low tide, DIC concentrations were 1.5-5-fold enriched relative to high tide concentrations, indicating an input of DIC from the marsh. Similar patterns (although dampened in magnitude) were …

The Chesapeake Bay : A Synopsis, William J. Hargis Jr.

Reports

No abstract provided.