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Articles 151 - 157 of 157
Full-Text Articles in Life Sciences
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 …
Degradation Kinetics Of Aromatic Organic Solutes Introduced Into A Heterogeneous Aquifer, Wg Macintyre, M Boggs, Cp Antworth, Tb Stauffer
Degradation Kinetics Of Aromatic Organic Solutes Introduced Into A Heterogeneous Aquifer, Wg Macintyre, M Boggs, Cp Antworth, Tb Stauffer
VIMS Articles
Degradation rates of benzene, p-xylene, naphthalene, and o-dichlorobenzene have been measured in a heterogeneous, unconfined aquifer during a pulse injection experiment at Columbus Air Force Base, Columbus, Mississippi. Dissolved oxygen in the pulse plume maintained aerobic conditions. Degradation kinetics calculated from the complete field data set were approximately first order with the following rate constants: benzene, 0.0070 d-1; p-xylene, 0.0107 d-1; naphthalene, 0.0064 d-1; and o-dichlorobenzene, 0.0046 d-1. Reaction rates were also calculated from a near-field subset of the data using a model based on the hydrologic characteristics of the aquifer. Shapes of the degradation rate curves were consistent with …
Oceanic Dispersion Of Larval Fish And Its Implication For Mortality Estimates - Case-Study Of Walleye Pollock Larvae In Shelikof Strait, Alaska, Suam Kim, Bohyun Bang
Oceanic Dispersion Of Larval Fish And Its Implication For Mortality Estimates - Case-Study Of Walleye Pollock Larvae In Shelikof Strait, Alaska, Suam Kim, Bohyun Bang
VIMS Articles
No abstract provided.
Geochemistry And Deposition Of Be-7 In River‐Estuarine And Coastal Waters, C. R. Olsen, I. L. Larsen, P. D. Lowry, N. H. Cutshall, Maynard Nichols
Geochemistry And Deposition Of Be-7 In River‐Estuarine And Coastal Waters, C. R. Olsen, I. L. Larsen, P. D. Lowry, N. H. Cutshall, Maynard Nichols
VIMS Articles
The atmospheric flux of cosmogenic Be-7 (53.3-day half-life) and the mode of ?Be deposition in river- estuarine and coastal environments have been examined. The atmospheric flux of ?Be commonly sup- ports inventories ranging from 1.0 to 2.0 pCi/cm 2 (1 pCi = 0.037 Bq). Beryllium 7 concentrations in water phase samples, collected across salinity gradients in several estuaries along the eastern coastline of the United States, range from 0.03 to 0.53 pCi/L and primarily reflect variations in Be-7supply and sorption kinetics. The major process controlling the concentration of Be-7 on estuarine suspended particles appears to be the length of time …
Wave Refraction By Warm Core Rings, George R. Mapp, Christopher S. Welch, John C. Munday Jr.
Wave Refraction By Warm Core Rings, George R. Mapp, Christopher S. Welch, John C. Munday Jr.
VIMS Articles
No abstract provided.
Mid‐Level Intrusions At The Continental Shelf Edge, Christopher S. Welch
Mid‐Level Intrusions At The Continental Shelf Edge, Christopher S. Welch
VIMS Articles
Observations across the continental shelf offshore from New Jersey in late summer 1976 show an intrusion of saline water at the mid level of the water column across the shelf edge front, which appears in density only as an offshore thickening of the pycnocline. This internal density field produces horizontal pressure gradient forces within the pycnocline in the onshore direction. These forces, in the linearized equation of motion with a constant eddy viscosity, drive a circulation which resembles a double Ekman spiral for internal pressure vertical distributions which are thin with respect to the Ekman depth. For thick pressure distributions, …
Estuarine Foraminifera From The Rappahannock River, Virginia, Robert L. Ellison, Maynard M. Nichols
Estuarine Foraminifera From The Rappahannock River, Virginia, Robert L. Ellison, Maynard M. Nichols
VIMS Articles
Populations of benthonlc foraminifera were studied from 263 samples obtained in 5 collections from the estuary, its tributaries and borderlng marshes