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Articles 211 - 216 of 216
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On The Response Of The Equatorial Thermocline In The Atlantic Ocean To The Seasonally Varying Trade Winds, Robert H. Weisberg, T. Y. Tang
On The Response Of The Equatorial Thermocline In The Atlantic Ocean To The Seasonally Varying Trade Winds, Robert H. Weisberg, T. Y. Tang
Marine Science Faculty Publications
Measurements made during the Seasonal Response of the Equatorial Atlantic experiment in 1983, when the easterly trade winds near the equator ceased and then intensified as part of their annual cycle, show a sequence of events leading to an adjusted thermocline. Both the duration and extent of the downwelling and upwelling associated with the adjustment process were zonally inhomogeneous along the equator. An analytical reduced gravity model was driven by a hierarchy of easterly wind stress forcing functions representative of the Atlantic to compare the integral nature of the forced long-wave responses with the observations. Qualitative agreement was found with …
Equatorial Atlantic Velocity And Temperature Observations: February-November 1981, Robert H. Weisberg
Equatorial Atlantic Velocity And Temperature Observations: February-November 1981, Robert H. Weisberg
Marine Science Faculty Publications
Upper ocean velocity and temperature measurements were obtained in the central equatorial Atlantic using surface moored current meters from February to November 1981. Distinct seasonal variations were observed in the zonal momentum and temperature on the equator of both the surface South Equatorial Current (SEC) and the subsurface Equatorial Undercurrent (EUC). After initially intensifying during boreal spring the SEC halted abruptly in early summer and the signature associated with this change progressed. At the observational depth of 100 m both speed and temperature increased during early summer with eastward progression and then decreased in fall. Higher frequency motions were also …
Factors Influencing The Degree Of Saturation Of The Surface And Intermediate Waters Of The North Pacific Ocean With Respect To Aragonite, Richard A. Feely, Robert H. Byrne, Peter R. Betzer, James F. Gendron, James G. Acker
Factors Influencing The Degree Of Saturation Of The Surface And Intermediate Waters Of The North Pacific Ocean With Respect To Aragonite, Richard A. Feely, Robert H. Byrne, Peter R. Betzer, James F. Gendron, James G. Acker
Marine Science Faculty Publications
New carbonate chemistry data obtained during a 1982 cruise have been combined with earlier GE‐OSECS and INDOPAC data to determine the degree of aragonite saturation of surface and intermediate waters of the North Pacific. Large gradients in saturation state occur in the region of the Subarctic Front in the north‐south direction and across the Subtropical Gyre in the east‐west direction. These gradients are primarily due to the extensive mixing that occurs in the intermediate waters of the western North Pacific. The major variations in saturation state were primarily related to the carbonate ion concentration, which, in turn, is primarily a …
Trophodynamics Of The Fish Valenciennellus Tripunctulatus. I. Vertical Distribution, Diet And Feeding Chronology, Thomas L. Hopkins, Ronald C. Baird
Trophodynamics Of The Fish Valenciennellus Tripunctulatus. I. Vertical Distribution, Diet And Feeding Chronology, Thomas L. Hopkins, Ronald C. Baird
Marine Science Faculty Publications
The adult and juvenile life stages of the small (~25mm) zooplanktivorous mesopelagic fish Valenciennellus tripunctulatus (Esmark) are found at depths of 200-600m throughout the diel period. Average population density was estimated to be 5 fish (104m3)-1 and the maximum density recorded was 11 fish (104m3)-1. Copepods constituted ~95% of all food items identified and Pleuromamma was the principal forage genus, contributing 31% and 56% to numbers and biomass of food items, respectively. Ontogenetic changes in diet were observed, the percentage of larger copepods increasing in the diet with increasing fish size. Food items …
Trophodynamics Of The Fish Valenciennellus Tripunctulatus Iii Energetics, Resources And Feeding Strategy, Ronald C. Baird, Thomas L. Hopkins
Trophodynamics Of The Fish Valenciennellus Tripunctulatus Iii Energetics, Resources And Feeding Strategy, Ronald C. Baird, Thomas L. Hopkins
Marine Science Faculty Publications
A model was constructed which relates energy in diet to metabolic requirements for the mesopelagic zooplanktivore fish Valenciennellus tripunctulatus. Linear and Von Bertalanffy growth models were used to explore the energetic consequences of a number of feasible age/growth strategies. Maxlmum efficiencies were obtained with linear growth to about 30 mm in 1 y. Efficiencies declined rapidly for slower growth strategies. It was hypothesized that an 'annual' life history strategy was optimum based on energetic considerations. Copepod prey in the 1-2 mm size class were an order of magnitude more abundant and over 4 times higher in caloric content than …
Trophodynamics Of The Fish Valenciennellus Tripunctulatus. Ii. Selectivity, Grazing Rates And Resource Utilization, R. C. Baird, Thomas L. Hopkins
Trophodynamics Of The Fish Valenciennellus Tripunctulatus. Ii. Selectivity, Grazing Rates And Resource Utilization, R. C. Baird, Thomas L. Hopkins
Marine Science Faculty Publications
Various patterns of resource utilization in the feeding strategy of Valenciennellus tripunctulatus, a small mesopelagic fish of tropical-subtropical oceans, were explored. Ivlev electivity indices suggest that copepods in general and the genus Pleuromamma in particular are being actively selected. Prey-size selection was apparent and strong negative indices were calculated for all plankton smaller than 1 mm. Non-crustacean prey in all size classes also gave negative indices. Strong positive indices were indicated for prey size classes greater than 2 mm. A model was developed to estimate grazing rates and efficiencies which is linearly influenced by swimming speed and plankton abundance, …