Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Entire DC Network
Simulation Of Annual Plankton Productivity Cycle In The Black Sea By A One-Dimensional Physical-Biological Model, Temel Oguz, Hugh Ducklow, Paola Malanotte-Rizzoli, Nikolai P. Nezlin, Umit Unluata
Simulation Of Annual Plankton Productivity Cycle In The Black Sea By A One-Dimensional Physical-Biological Model, Temel Oguz, Hugh Ducklow, Paola Malanotte-Rizzoli, Nikolai P. Nezlin, Umit Unluata
VIMS Articles
The annual cycle of the plankton dynamics in the central Black Sea is studied by a one-dimensional vertically resolved physical-biological upper ocean model, coupled with the Mellor-Yamada level 2.5 turbulence closure scheme. The biological model involves interactions between the inorganic nitrogen (nitrate, ammonium), phytoplankton and herbivorous zooplankton biomasses, and detritus. Given a knowledge of physical forcing, the model simulates main observed seasonal and vertical characteristic features, in particular, formation of the cold intermediate water mass and yearly evolution of the upper layer stratification, the annual cycle of production with the fall and the spring blooms, and the subsurface phytoplankton maximum …
Utilization And Turnover Of Labile Dissolved Organic Matter By Bacterial Heterotrophs In Eastern North Pacific Surface Waters, J Cherrier, Je Bauer, Erm Druffel
Utilization And Turnover Of Labile Dissolved Organic Matter By Bacterial Heterotrophs In Eastern North Pacific Surface Waters, J Cherrier, Je Bauer, Erm Druffel
VIMS Articles
Seawater incubation experiments were conducted in June and October 1992 to examine bacterial utilization of labile dissolved organic matter (DOM) in open ocean surface waters of the eastern North Pacific. Natural plankton extract-DOM (PE-DOM) and selected model compounds were added to seawater samples to evaluate bacterial utilization and respiration rates relative to bacterial carbon production rates for the various amendments. PE-DOM always stimulated bacterial production and DOM utilization, and the primary nitrogen source supporting this bacterial production was dissolved organic nitrogen (DON). Utilization of DON during exponential growth was balanced by the production of ammonium for samples amended with PE-DOM. …
Seasonal Variability Of Particulate Organic Radiocarbon In The Northeast Pacific Ocean, Ellen R.M. Druffel, James E. Bauer, Peter M. Williams, Shelia Griffin, David Wolgast
Seasonal Variability Of Particulate Organic Radiocarbon In The Northeast Pacific Ocean, Ellen R.M. Druffel, James E. Bauer, Peter M. Williams, Shelia Griffin, David Wolgast
VIMS Articles
We present Delta(14)C measurements of particulate organic carbon (POC) collected on four cruises at our time series site (station M) in the northeast Pacific Ocean. We observe a large gradient with depth in the suspended POC Delta(14)C values (124-160 parts per thousand). These profiles display lower Delta(14)C values (by 20-30 parts per thousand) in samples between 2500 m and the bottom during June 1992 and July 1993 than those during February and October 1992. Values of Delta(14)C in sinking POC from deep-moored sediment trap collections suggest a semiannual trend that displays lower overall Delta(14)C in material collected during periods of …