Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Biology (12)
- Animal Sciences (8)
- Ecology and Evolutionary Biology (6)
- Zoology (6)
- Physical Sciences and Mathematics (5)
-
- Social and Behavioral Sciences (5)
- Animal Studies (4)
- Cognition and Perception (3)
- Comparative Psychology (3)
- Integrative Biology (3)
- Oceanography (3)
- Oceanography and Atmospheric Sciences and Meteorology (3)
- Psychology (3)
- Terrestrial and Aquatic Ecology (3)
- Aquaculture and Fisheries (2)
- Behavior and Ethology (2)
- Biological Psychology (2)
- Environmental Sciences (2)
- Plant Sciences (2)
- Agricultural and Resource Economics (1)
- Biodiversity (1)
- Cognitive Neuroscience (1)
- Cognitive Psychology (1)
- Cognitive Science (1)
- Environmental Microbiology and Microbial Ecology (1)
- Environmental Monitoring (1)
- Environmental Studies (1)
- Microbiology (1)
- Institution
- Keyword
-
- Gulf of Mexico (9)
- Climate change (5)
- Sea level rise (5)
- Apalachicola (4)
- Aquaculture (3)
-
- Biodiversity (3)
- Coastal (3)
- Deepwater Horizon (3)
- Dolphins (3)
- Hydrodynamics (3)
- Hypoxia (3)
- Remote sensing (3)
- Salt marsh (3)
- Signature whistles (3)
- Antarctica (2)
- Biomarker (2)
- Chesapeake Bay (2)
- Coastal morphology (2)
- Coastal upwelling (2)
- Coastal wetlands (2)
- Cognition (2)
- Digenea (2)
- EUTROPHICATION (2)
- Elasmobranch (2)
- Eutrophication (2)
- Florida (2)
- Hydro-MEM (2)
- Hydrology (2)
- Jellyfish (2)
- Larval condition (2)
Articles 211 - 221 of 221
Full-Text Articles in Marine Biology
Particle Fluxes During Austral Spring And Summer In The Southern Ross Sea, Antarctica, Vernon L. Asper, Walker O. Smith Jr.
Particle Fluxes During Austral Spring And Summer In The Southern Ross Sea, Antarctica, Vernon L. Asper, Walker O. Smith Jr.
Faculty Publications
The flux of particles from the euphotic zone through 200 m was investigated on the Ross Sea continental shelf during two cruises, the first in November-December 1994 and the second in December 1995 and January 1996. An assessment of surface layer phytoplankton biomass and productivity was made simultaneously. Particle flux was measured using floating sediment traps whose collection efficiency was assessed rigorously. Phytoplankton biomass and productivity increased rapidly in November-December, and biomass was maximal in mid-December. Thereafter productivity appeared to decline substantially. Biomass declined as well, but mot as rapidly as productivity. Vertical flux rates were low early in the …
Optimized Boundary Conditions And Data Assimilation With Application To The M-2 Tide In The Yellow Sea, Igor Shulman, James K. Lewis, Alan F. Blumberg, B. Nicholas Kim
Optimized Boundary Conditions And Data Assimilation With Application To The M-2 Tide In The Yellow Sea, Igor Shulman, James K. Lewis, Alan F. Blumberg, B. Nicholas Kim
Faculty Publications
An optimization approach is derived for assimilating tidal height information along the open boundaries of a numerical model. The approach is then extended so that similar data along transects inside a model domain can also be optimally assimilated. To test the application of such an optimized methodology, M-2 tidal simulations were conducted with a numerical ocean model of the Yellow Sea, an area with a strong tidal influence. The use of the optimized open boundary conditions and internal data assimilation leads to a significant improvement of the predictive skill of the model. Average errors can be reduced by up to …
On The Utility And Disutility Of Jebar, Mark A. Cane, Vladimir M. Kamenkovich, Alexander Krupitsky
On The Utility And Disutility Of Jebar, Mark A. Cane, Vladimir M. Kamenkovich, Alexander Krupitsky
Faculty Publications
The usefulness of the concept of JEBAR, the joint effect of baroclinicity and relief, in large-scale ocean dynamics is critically analyzed. The authors address two questions. Does the JEBAR term properly characterize the joint impact of stratification and bottom topography on the ocean circulation? Do estimates of the JEBAR term from observational data allow reliable diagnostic calculations? The authors give a negative answer to the first question. The JEBAR term need not give a true measure of the effect of bottom relief in a stratified ocean. A simple two-layer model provides examples. As to the second question, it is demonstrated …
Local Data Assimilation In Specification Of Open Boundary Conditions, Igor Shulman
Local Data Assimilation In Specification Of Open Boundary Conditions, Igor Shulman
Faculty Publications
A data assimilation approach to specify open boundary conditions is proposed. The boundary values are determined from the solution of the special optimization problem: minimization of the difference between the model and reference boundary values under the integral constraints on the open boundary. These constraints represent the energy, momentum, and mass fluxes through the open boundary. Reference values represent the a priori knowledge about the boundary values. They might be derived from observations, results of another model run, or from another approach to the specification of open boundary conditions. Optimized open boundary conditions are presented in detail for the barotropic …
Finite Difference Of Adjoint Or Adjoint Of Finite Difference?, Ziv Sirkes, Eli Tziperman
Finite Difference Of Adjoint Or Adjoint Of Finite Difference?, Ziv Sirkes, Eli Tziperman
Faculty Publications
Adjoint models are used for atmospheric and oceanic sensitivity studies in order to efficiently evaluate the sensitivity of a cost function (e.g., the temperature or pressure at some target time t(f), averaged over some region of interest) with respect to the three-dimensional model initial conditions. The time-dependent sensitivity, that is the sensitivity to initial conditions as function of the initial time t(i), may be obtained directly and most efficiently from the adjoint model solution. There are two approaches to formulating an adjoint of a given model. In the first (''finite difference of adjoint''), one derives the continuous adjoint equations from …
Time Series Measurements Of Chlorophyll Fluorescence In The Oceanic Bottom Boundary Layer With A Multisensor Fiber-Optic Fluorometer, Eurico J. Dsa, Steven E. Lohrenz, Vernon L. Asper, Roy A. Walters
Time Series Measurements Of Chlorophyll Fluorescence In The Oceanic Bottom Boundary Layer With A Multisensor Fiber-Optic Fluorometer, Eurico J. Dsa, Steven E. Lohrenz, Vernon L. Asper, Roy A. Walters
Faculty Publications
An in situ multisensor fiber-optic fluorometer (MFF) has been developed to acquire long-term chlorophyll fluorescence measurements in the oceanic bottom boundary layer to characterize the finescale pigment structure at vertical spatial scales comparable to physical measurements. The eight fluorescence sensors of the MFF are composed of dual optical fibers of varying lengths (1.5-8 m), with the fiber ends oriented at 30 degrees to each other and enclosed by a small light baffle. Strobe excitation blue light is passed through one of each pair of optical fibers and stimulated chlorophyll fluorescence is carried back to a photomultiplier. Two sets of four …
234Th And 210Pb Evidence For Rapid Ingestion Of Settling Particles By Mobile Epibenthic Megafauna In The Abyssal Ne Pacific, L. M. L. Lauerman, J. M. Smoak, Timothy J. Shaw, W. S. Moore, K. L. Smith Jr.
234Th And 210Pb Evidence For Rapid Ingestion Of Settling Particles By Mobile Epibenthic Megafauna In The Abyssal Ne Pacific, L. M. L. Lauerman, J. M. Smoak, Timothy J. Shaw, W. S. Moore, K. L. Smith Jr.
Faculty Publications
No abstract provided.
The Probability Density Function Of Ocean Surface Slopes And Its Effects On Radar Backscatter, Y. Liu, Xh Yan, W.T. Liu, P.A. Hwang
The Probability Density Function Of Ocean Surface Slopes And Its Effects On Radar Backscatter, Y. Liu, Xh Yan, W.T. Liu, P.A. Hwang
Faculty Publications
Based on Longuet-Higgins's theory of the probability distribution of wave amplitude and wave period and on some observations, a new probability density function (PDF) of ocean surface slopes is derived. It is f(zeta(x), zeta(y)) = n/2 pi(n - 1)sigma(u) sigma(c) x [1 + zeta(x)(2)/(n - 1)sigma(n)(2) + zeta(y)(2)/(n - 1)sigma(c)(2)](-(n + 2)/2) + skewness, where zeta(x) and zeta(y) are the slope components in upwind and crosswind directions, respectively; sigma(u)(2) and sigma(c)(2) are the corresponding mean-square slopes. The peakedness of slopes is generated by nonlinear wave-wave interactions in the range of gravity waves. The skewness of slopes is generated by nonlinear …
Optimization Approach To The Treatment Of Open Boundary-Conditions, I. Shulman, James K. Lewis
Optimization Approach To The Treatment Of Open Boundary-Conditions, I. Shulman, James K. Lewis
Faculty Publications
A solution to an optimization problem is developed that deals with minimizing a measure of difference between the values of observed and predicted variables at an open ocean boundary. Minimization is based on the change of the flux of energy through the open boundary. It is shown that many of the longwave radiation conditions that are commonly used in ocean modeling can be derived using this optimization criteria. However, the minimization process is seen to produce a modification of these radiation conditions in that they are multiplied by a coefficient, which allows the conditions to adapt to a change in …
Biochemical And Histological Changes During Ovarian Development Of Cobia, Rachycentron Canadum, From The Northern Gulf Of Mexico, Patricia M. Biesiot, Robert E. Caylor, James S. Franks
Biochemical And Histological Changes During Ovarian Development Of Cobia, Rachycentron Canadum, From The Northern Gulf Of Mexico, Patricia M. Biesiot, Robert E. Caylor, James S. Franks
Faculty Publications
Female cobia, Rachycentron canadum, were sampled on their spawning grounds in the Northern Gulf of Mexico to study changes in proximate analysis (protein, lipid, carbohydrate, and ash) of the ovaries during gonadal maturation. Four major stages of oocyte development were studied: stage 1, previtellogenesis; stage 2, vitellogenesis; stage 3, final maturation; and stage 4, postovulation. Cobia are multiple spawning fish; therefore, ovaries engaged in a sequential round of oogenesis were distinguished as stages 1' and 2'. Protein was the major constituent of cobia ovaries and its contribution of cobia ovaries and its contribution remained fairly constant (49-55% fo the …
Distributions Of Pigments And Primary Production In A Gulf-Stream Meander, Steven E. Lohrenz, John J. Cullen, David A. Phinney, Donald B. Olson, Charles S. Yentsch
Distributions Of Pigments And Primary Production In A Gulf-Stream Meander, Steven E. Lohrenz, John J. Cullen, David A. Phinney, Donald B. Olson, Charles S. Yentsch
Faculty Publications
An investigation was made of physical effects of Gulf Stream meandering on the vertical and horizontal distributions of photosynthetic pigments and primary production. Cruises were conducted in the vicinity of a meander east of 73-degrees-W and north of 37-degrees-N from September 21 to October 5 (leg 1) and October 12-21, 1988 (leg 2), on the R/V Cape Hatteras. Relationships of photosynthesis (normalized to chlorophyll) to irradiance (P-1) did not show large horizontal variation, and water column composite P-I curves from leg 1 and leg 2 were similar. Therefore a single P-I curve derived from pooled data was used to model …