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A Balanced Nitrogen Budget Of The Surface Layer Of The Southern Ross Sea, Antarctica, Walker O. Smith Jr.
A Balanced Nitrogen Budget Of The Surface Layer Of The Southern Ross Sea, Antarctica, Walker O. Smith Jr.
VIMS Articles
To understand marine biogeochemical cycles, it is critical to quantitatively balance organic matter transformations within the euphotic zone. Such an assessment for nitrogen is difficult because of lateral advection, uncertainties in individual measurements, the complexity of elemental transformations (including nitrification and denitrification), and the difficulty of collecting data on appropriate space and time scales. Two cruises were conducted to the southern Ross Sea, Antarctica, to understand the time-varying fluxes of nitrogen into its various pools. From these data a balanced inventory was constructed. Nitrate removal in the upper 200 m was balanced by particulate and dissolved organic nitrogen production, ammonification, …
Bacterial Consumption Of Doc During Transport Through A Temperate Estuary, Pa Raymond, Je Bauer
Bacterial Consumption Of Doc During Transport Through A Temperate Estuary, Pa Raymond, Je Bauer
VIMS Articles
Bacterial utilization of natural levels of dissolved organic carbon (DOC) was measured in the York River estuary, a sub-estuary of the Chesapeake Bay. This study was undertaken in order to elucidate spatial and temporal changes in bacterial carbon utilization and to evaluate its importance as a pathway for organic matter transformation in estuaries. Multiple pools of DOC were defined based on decomposition kinetics. The first pool (G(1)) made up a mean of 2.8% of total DOC and had turnover times of less than or equal to 5 d. The second pool (G(2)) comprised an average of 4.9% of total DOC …
Radiocarbon Distributions In Southern Ocean Dissolved And Particulate Organic Matter, Erm Druffel, Je Bauer
Radiocarbon Distributions In Southern Ocean Dissolved And Particulate Organic Matter, Erm Druffel, Je Bauer
VIMS Articles
Dissolved organic carbon (DOC) is the largest actively exchanging pool of organic carbon in the ocean, yet its sources and sinks are not well constrained. The average C-14 ages of DOC in the deep N. Atlantic and N. Pacific Oceans are 4,000 [Bauer et al., 1992; Druffel et al., 1992] and 6,000 years [Williams and Druffel, 1987], respectively, and represent the beginning and end of the deep ocean conveyor [Broecker, 1991]. Here we report that the deep Southern Ocean DOC has a C-14 age (5,600 y) much closer to that of the deep N. Pacific, but its concentration in seawater …
Demonstration Of The Onshore Transport Of Larval Invertebrates By The Shoreward Movement Of An Upwelling Front, Al Shanks, J Largier, L Brink, J Brubaker, R Hooff
Demonstration Of The Onshore Transport Of Larval Invertebrates By The Shoreward Movement Of An Upwelling Front, Al Shanks, J Largier, L Brink, J Brubaker, R Hooff
VIMS Articles
Upwelling winds off North Carolina set up upwelling fronts. As the wind forcing relaxed following such a coastal upwelling event, we observed the upwelling front move onshore. The low-density surface water moved shoreward over the upwelled water, forming a convergence zone at the-front. This shoreward-moving front concentrated and transported larvae. Larval sergestid shrimp, spionid polychaete larvae, and the veligers of Odostomia sp. and Bittium sp, were concentrated on the seaward side of the moving convergence. Blue crab megalopae were concentrated at the surface immediately seaward of the front. These data demonstrate that a relaxing upwelling front can transport high concentrations …