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Open-Incubation, Diffusion Methods For Measuring Solute Reaction Rates In Sediments, Robert C. Aller, James E. Mackin Jan 1989

Open-Incubation, Diffusion Methods For Measuring Solute Reaction Rates In Sediments, Robert C. Aller, James E. Mackin

Journal of Marine Research

Sedimentary solute distributions and fluxes are determined in part by the kinetics of production/consumption reactions in a deposit. It is possible to estimate rates and investigate kinetic relations in undisturbed or manipulated sediments by documenting build-up or depletion patterns of solutes allowed to diffuse either between relatively thin sections of sediment and a well-stirred water reservoir (plug incubation); or through a large section of sediment without an overlying reservoir (whole-core incubation). The time-dependent concentrations in the sediment in both cases depend on reaction rates, kinetics, diffusion coefficients, and geometric scaling of the sediment and contacting reservoir. Major advantages of the …

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The Influence Of Gulf Stream Warm Core Rings On Recruitment Of Fish In The Northwest Atlantic, Ransom A. Myers, Ken Drinkwater Jan 1989

The Influence Of Gulf Stream Warm Core Rings On Recruitment Of Fish In The Northwest Atlantic, Ransom A. Myers, Ken Drinkwater

Journal of Marine Research

The a priori hypothesis that entrainment of shelf water by warm core rings reduces recruitment of marine fish stocks through offshore transport is tested. Weekly satellite images for 1973 through 1986 are used to generate time-series of the positions and numbers of warm core rings and the locations of the shelf-slope front from the mid-Atlantic Bight to the Grand Banks. These data are combined with estimates of the timing of the spawning and the duration of larval stages to create stock-specific annual indices of ring activity and shelf-slope front variability. There is evidence that increased warm core ring activity reduces …

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Vertical Distribution Of Microbial And Meiofaunal Populations In Sediments Of A Natural Coastal Hydrocarbon Seep, Paul A. Montagna, James E. Bauer, Dane Hardin, Robert B. Spies Jan 1989

Vertical Distribution Of Microbial And Meiofaunal Populations In Sediments Of A Natural Coastal Hydrocarbon Seep, Paul A. Montagna, James E. Bauer, Dane Hardin, Robert B. Spies

Journal of Marine Research

We studied the vertical distribution of microbes and meiofauna in natural hydrocarbon seep sediments to determine if there was a relationship between profiles of benthic trophic structure and the unique biogeochemical conditions present at the seep. Three stations in the Santa Barbara Channel represented a gradient of natural petroleum seepage, from very active, to moderate, to none. Seasonal differences were examined by sampling in the three major oceanographic seasons, upwelling (April), mixed (July), and Davidson (December). Densities of microbes and meiofauna were highest in July, and decreased in winter. All population sizes decreased with increasing depth in the sediment. Harpacticoids …

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Lagrangian Statistics In The South Atlantic As Derived From Sos And Fgge Drifters, Horacio A. Figueroa, Donald B. Olson Jan 1989

Lagrangian Statistics In The South Atlantic As Derived From Sos And Fgge Drifters, Horacio A. Figueroa, Donald B. Olson

Journal of Marine Research

Daily averaged positions obtained from satellite-tracked drifting buoys launched during the First GARP Global Experiment (FGGE) and those launched as part of the ONR sponsored Southern Ocean Studies (SOS) are used to analyze eddy diffusivity due to mesoscale motions and its parameterization in some regions of the South Atlantic Ocean, significantly extending the energy range for which this type of estimations are available. Diffusion coefficients, Lagrangian integral time scales and velocity variances are calculated, and Taylor's (1921) Theorem which relates eddy diffusivity estimates with the dispersion of particles from a fixed origin is tested. In all of the cases analyzed …

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Circulation Of The Antarctic Intermediate Water In The North Atlantic Ocean, Mizuki Tsuchiya Jan 1989

Circulation Of The Antarctic Intermediate Water In The North Atlantic Ocean, Mizuki Tsuchiya

Journal of Marine Research

The Antarctic Intermediate Water in the North Atlantic Ocean is characterized by high concentrations of silica, and this characteristic is used to trace its circulation. An isopycnal map of silica reveals high-silica water extending on the west and north sides of the Mediterranean outflow water from the Straits of Florida as far northeast as 60N just south of Iceland. The extent of this high-silica Antarctic Intermediate Water is in remarkably good agreement with the path of the Gulf Stream-North Atlantic Current indicated by the geostrophic-flow field at this level.

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The Spatial And Temporal Structure Of Hydrographic And Phytoplankton Biomass Heterogeneity Along The Catalan Coast (Nw Mediterranean), Mercedes Masó, Carlos M. Duarte Jan 1989

The Spatial And Temporal Structure Of Hydrographic And Phytoplankton Biomass Heterogeneity Along The Catalan Coast (Nw Mediterranean), Mercedes Masó, Carlos M. Duarte

Journal of Marine Research

The horizontal and temporal distribution of hydrographic properties and phytoplankton biomass along the Catalan coast were analyzed to determine their variance structure (i.e., variance partition between temporal, alongshore, and across-shore components), and the relationship between hydrographic heterogeneity and variability in phytoplankton biomass. Temporal chlorophyll variability was highly seasonal, but horizontal biomass variability was related to hydrographic variability, as evidenced by significant correlations to temperature and salinity. The strength of chlorophyll-salinity correlations changed according to the extent of riverine influences within the area, but significant correlations were always negative, indicating enhanced phytoplantkon growth due to river runoff. Temperature-chlorophyll correlations changed seasonally, …

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Organic Matter Decomposition Pathways And Oxygen Consumption In Coastal Marine Sediments, James E. Mackin, Kenneth T. Swider Jan 1989

Organic Matter Decomposition Pathways And Oxygen Consumption In Coastal Marine Sediments, James E. Mackin, Kenneth T. Swider

Journal of Marine Research

In this study, we investigate the possible use of ∑CO2 production, determined from anoxic incubation experiments, and natural solute (O2, NH4+, SO4–) distributions to infer the pathways of organic matter decomposition in nearshore marine sediments. Integrated ∑CO2 production from anoxic incubation experiments agreed well with direct measurements of ∑CO2 fluxes across oxic sediment-water interfaces in Long Island Sound and Flax Pond salt marsh. This implies that anoxic incubations give reliable estimates of organic carbon remineralization rates. Therefore, anoxic ∑CO2 production, as a function of depth, was used to …

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Composition And Degradation Of Salp Fecal Pellets: Implications For Vertical Flux In Oceanic Environments, David A. Caron, Laurence P. Madin, Jonathan J. Cole Jan 1989

Composition And Degradation Of Salp Fecal Pellets: Implications For Vertical Flux In Oceanic Environments, David A. Caron, Laurence P. Madin, Jonathan J. Cole

Journal of Marine Research

Changes in the sinking rates, ash-free dry weights, particulate carbon and nitrogen content, and carbon:nitrogen ratios from the fecal pellets of several species of oceanic salps were examined in ten-day decomposition studies. Although bacteria and protozoa became abundant in the incubation vessels, most of the fecal pellets remained physically intact throughout the study. Bacterial activity in the pellets (measured by the rate of uptake of 3H-thymidine) increased, but microbial degradation had little effect on the sinking speeds of most of the fecal pellets. The average losses of ash-free dry weight and carbon and nitrogen content, along with changes in …

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Oxygen, Sulfide And Diffusion: Why Thiobiotic Meiofauna Must Be Sulfide-Insensitive First-Order Respirers, Eric Powell Jan 1989

Oxygen, Sulfide And Diffusion: Why Thiobiotic Meiofauna Must Be Sulfide-Insensitive First-Order Respirers, Eric Powell

Journal of Marine Research

Thiobios (sulfide-dependent) meiofauna have an aerobic metabolism, are sulfide-insensitive and rarely contain symbiotic sulfur-oxidizing bacteria. Adaptations so far observed in thiobios are consistent with the overriding need to maximize the diffusive flux of oxygen and sulfide to optimize energy yield. Both accrue from the requirement that oxygen and sulfide uptake and metabolism be controlled by diffusion and first-order rate reactions. These adaptations include variation in shape, mitochondrial distribution and respiratory capacity. Meiofauna can substantially supplement a more inefficient anaerobic metabolism with aerobic metabolism at oxygen concentrations as low as 0.1 μM. Hence, an aerobic capacity is useful even in …

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A Brownian-Pumping Model For Oceanic Trace Metal Scavenging: Evidence From Th Isotopes, B. D. Honeyman, P. H. Santschi Jan 1989

A Brownian-Pumping Model For Oceanic Trace Metal Scavenging: Evidence From Th Isotopes, B. D. Honeyman, P. H. Santschi

Journal of Marine Research

Two observed characteristics of Th isotope and stable metal sorption in natural aquatic systems are seemingly at odds with physico-chemical adsorption theory: (1) characteristic sorption times of days to weeks and (2) Kds which are inversely related in magnitude to particle concentrations. In addition, sorption rate constants are positiveiy correlated with particle concentrations and Kd. This paper presents a conceptual and mathematical model with which it is proposed that these metal sorption characteristics have the same underlying physical process in common: the coagulation of colloidal (nonfilterable) particles onto larger (filterable) particles. “Brownian pumping” (the transfer of …

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The Ventilated Thermocline In Quasigeostrophic Approximation, Myrl C. Hendershott Jan 1989

The Ventilated Thermocline In Quasigeostrophic Approximation, Myrl C. Hendershott

Journal of Marine Research

The ventilated thermocline model of Luyten et al. (hereafter LPS), (1983) is reformulated in the quasigeostrophic approximation. The quasigeostrophic solutions with zonal outcrop lines capture the salient features of the solutions of LPS. When the outcrop lines are sufficiently nonzonal, the quasigeostrophic solutions resemble those of Parsons (1969), Veronis (1973), and Huang (1984), resolving an inconsistency in Parsons' solution. But an attempt to close the quasigeostrophic solution having two moving layers with a western boundary current in which friction is parameterized as a linear drag coefficient results in an ill posed problem. The paper concludes with a comparison of cross-gyre …

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A Nonlinear, Time-Dependent Thermocline Theory, William K. Dewar Jan 1989

A Nonlinear, Time-Dependent Thermocline Theory, William K. Dewar

Journal of Marine Research

A noneddy resolving, time-dependent, nonlinear theory of the large-scale ocean circulation is presented. The variability in this theory occurs as a response to variability in forcing. Baroclinic and barotropic evolution is computed using a two-layer, quasigeostrophic, wind-driven model. Both analytical and numerical solutions are obtained. Attention is focussed on the low-frequency, basin scale fluctuations of the wind. Based on these restrictions, the various modes of response are separated by means of a multiple time scale analysis. The barotropic response is found to be effectively instantaneous, and a relatively simple advection equation is shown to govern the baroclinic response. Analytical solutions …

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Eddy Momentum And Heat Ftuxes And Their Effects On The Circulation Of The Equatorial Pacific Ocean, Harry L. Bryden, Esther C. Brady Jan 1989

Eddy Momentum And Heat Ftuxes And Their Effects On The Circulation Of The Equatorial Pacific Ocean, Harry L. Bryden, Esther C. Brady

Journal of Marine Research

Eddy momentum and heat fluxes are estimated from three-dimensional arrays of long time-series current meter measurements in the equatorial Pacific near 152W and 110W during 1979 to 1981. Eddies transport eastward momentum away from the equator above the core of the Equatorial Undercurrent; they transport eastward momentum toward the equator below the Undercurrent core. The vertical integral of the eddy momentum flux divergence is equivalent to a westward wind stress of 0.16 dyne cm–2. Eddies transport heat toward the equator at all depths down to 250 m. At 100 m depth and below, the eddy heat flux convergences …

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Low Frequency Variability In The Lower St. Lawrence Estuary, Gordon Mertz, Mohammed I. El-Sabh, Vladimir G. Koutitonsky Jan 1989

Low Frequency Variability In The Lower St. Lawrence Estuary, Gordon Mertz, Mohammed I. El-Sabh, Vladimir G. Koutitonsky

Journal of Marine Research

The lower St. Lawrence Estuary is a good example of wide estuaries with a second lateral boundary within several internal Rossby radii. We compare direct measurements from the 1979 lower St. Lawrence estuary mesoscale current meter array with satellite thermal images observed during the same period. The current field appears to show two quasi-steady states: one configuration is characterized by strong outflow along the north shore of the estuary with a transverse front at the mouth. The other current pattern is more typical of estuaries, with inflow along the north shore and outflow along the south shore. Transitions between these …

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On The Contribution Of The Benthos To Pelagic Production, Peter H. Doering Jan 1989

On The Contribution Of The Benthos To Pelagic Production, Peter H. Doering

Journal of Marine Research

Annual production and consumption of oxygen were compared in large outdoor mesocosms differing only in the presence or absence of an intact benthic community and associated sediments. Both daily apparent production and nighttime respiration of oxygen were greater in tanks with a benthos. The fluxes of oxygen into, and dissolved inorganic nitrogen out of the bottom were also greater in tanks with an intact benthos. In tanks with a benthos, calculated gross system production increased 33% relative to tanks lacking a benthos. Depending on assumed O:N ratios only 45–60% of this increase was attributable to differences in the flux of …

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Chaetognaths And Oceanography On Georges Bank, R. Gregory Lough, Ronald W. Trites Jan 1989

Chaetognaths And Oceanography On Georges Bank, R. Gregory Lough, Ronald W. Trites

Journal of Marine Research

A dense breeding population of chaetognaths, Sagitta elegans, was observed on northeastern Georges Bank during autumn, 1978. Four grid surveys conducted on the northeast region of the Bank over the period 17-30 October 1978 revealed that the high concentration "patch" of adult S. elegans. about 56 km on long axis, remained essentially on the eastern part of the grid in weakly stratified water of 67 m average depth. Current meter measurements indicated residual flow to the southeast sufficiently high to transport a passively drifting organism out of the area over the two weeks of study. Discrete vertical sampling showed that …

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A Numerical Study Of Wind Forcing Of Eddies And Jets In The California Current System, Mary L. Batteen, Robert L. Haney, Terrance A. Tielking, Philip G. Renaud Jan 1989

A Numerical Study Of Wind Forcing Of Eddies And Jets In The California Current System, Mary L. Batteen, Robert L. Haney, Terrance A. Tielking, Philip G. Renaud

Journal of Marine Research

A high-resolution, multi-level, primitive equation ocean model is used to examine the response to wind forcing of an idealized flat-bottomed oceanic regime along an eastern ocean boundary. A band of steady alongshore, upwelling favorable winds, either with or without alongshore variability, is used as forcing on both an f-plane and a, β-plane. In each experiment a wind-driven equatorward coastal jet and a poleward undercurrent are generated. In time the coastal jet and undercurrent become unstable and lead to the development of eddies and jets with relatively strong onshore and offshore directed flows. The alongshore variation in alongshore wind …

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On The Barotropic Planetary Oscillations Of The Pacific, Arthur J. Miller Jan 1989

On The Barotropic Planetary Oscillations Of The Pacific, Arthur J. Miller

Journal of Marine Research

Free linear solutions of the barotropic shallow-water equations are computed for a variety of basin shapes and topographies relevant to the Pacific Ocean. Attention is drawn to the 2-day to 6-day period band within which large-scale coherency is observed in Pacific tide-gauge records of sea level. In a particular model basin with realistic topography, the fundamental planetary mode of the Pacific occurs with a period of 3 days and four other planetary-topographic modes populate the 4–6 day period band. We argue that the frequencies and structures of these modes are representative of the largest-scale vorticity oscillations of the Pacific and …

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The Mythical Thermohaline Oscillator?, Barry Ruddick, Lingqi Zhang Jan 1989

The Mythical Thermohaline Oscillator?, Barry Ruddick, Lingqi Zhang

Journal of Marine Research

The system discussed by Stommel (1987) and Welander (1982), in which heating and evaporation at the surface of the ocean are balanced by vertical turbulent mixing, is studied analytically and numerically for mixing laws appropriate to salt fingers, rather than mechanical turbulence. Stommel and Welander found for mechanically-driven turbulent mixing that a limit cycle of T and S exists (that is, T and S oscillate) in the presence of steady forcing. We find that the usual salt finger parameterizations, in which salinity flux coefficient and buoyancy flux ratio decrease with increasing density ratio, do not allow a limit cycle. This …

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Lead-210 And Polonium-210 In Pteropod And Heteropod Mollusc Shells From The North Pacific: Evaluation Of Sample Treatments And Variation With Shell Size, Victoria J. Fabry, Margaret L. Delaney Jan 1989

Lead-210 And Polonium-210 In Pteropod And Heteropod Mollusc Shells From The North Pacific: Evaluation Of Sample Treatments And Variation With Shell Size, Victoria J. Fabry, Margaret L. Delaney

Journal of Marine Research

Lead-210 activities in carefully cleaned size groups of pteropod and heteropod shells from the eastern equatorial Pacific were typically 0.3 dpm/g shell, similar to those reported in other biogenic calcium carbonates. However, 210Po activities were in excess of levels expected from the decay of shell-incorporated 210Pb, with (210Po/210Pb) activity ratios ranging from 20 to 28 in size-fractionated samples. Sample treatment procedures were examined using pteropod shells collected from diverse locations of the North Pacific. Possible sources of 210Po in excess of 210Pb in shells include inclusion of 210Po in the organic …

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Mechanisms Of Subsurface Thermal Structure And Sea Surface Thermohaline Variabilities In The Southwestern Tropical Pacific During 1975-85, Thierry Delcroix, Christian Hénin Jan 1989

Mechanisms Of Subsurface Thermal Structure And Sea Surface Thermohaline Variabilities In The Southwestern Tropical Pacific During 1975-85, Thierry Delcroix, Christian Hénin

Journal of Marine Research

Major features of the southwestern tropical Pacific (SWTP), defined between 160E–140W and 24S–10S, are brought to light through analysis of surface water samples (23000) and temperature/depth observations (8500), both collected by ship of opportunity programs during the 1979–85 period. The mean vertical thermal structure (and its related parameters), mean sea surface temperature (SST) and salinity (SSS) are first portrayed, to further quantify the 1979–85 variability. It is demonstrated that the observed seasonal and interannual variabilities, the latter being associated with the strong 1982–83 EI Niño Southern Oscillation (ENSO) event, are mostly governed by specific mechanisms involving varying wind field and …

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The Response Of The Coastal Ocean To Strong Offshore Winds: With Application To Circulations In The Gulfs Of Tehuantepec And Papagayo, Julian P. Mccreary Jr., Hyong S. Lee, David B. Enfield Jan 1989

The Response Of The Coastal Ocean To Strong Offshore Winds: With Application To Circulations In The Gulfs Of Tehuantepec And Papagayo, Julian P. Mccreary Jr., Hyong S. Lee, David B. Enfield

Journal of Marine Research

Two ocean models are used to investigate the response of the coastal ocean to strong offshore winds: a linear 1½-layer model, and a nonlinear 1½-layer model that allows entrainment of cool water into the surface layer. The models are forced by wind stress fields similar in structure to the intense winter-time, mountain-pass jets (∼20 dyne/cm2) that appear in the Gulfs of Tehuantepec and Papagayo for periods of 3–10 days. Solutions are arranged in a hierarchy of increasing dynamical complexity, in order to illustrate the important physical processes. They compare favorably with observations in several ways. Some properties of …

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Longitudinal Dispersion Of Suspended Particles In Oscillatory Currents, Hidekazu Yasuda Jan 1989

Longitudinal Dispersion Of Suspended Particles In Oscillatory Currents, Hidekazu Yasuda

Journal of Marine Research

This study has investigated theoretically longitudinal dispersion of suspended fine particles with settling velocity and revealed the dispersing behavior from the initial to the stationary stages in tidal oscillatory currents. A Stokes layer of the oscillatory current plays a remarkably significant role on dispersion of settling particles when the mixing time in cross-section is larger than the period of tidal oscillation. When the settling velocity exceeds a certain value, however, the dispersion coefficient of particles decreases with increasing settling velocity. In an oscillatory current with linear profile, settling velocity of dispersing particles decreases the value of the dispersion coefficient all …

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Microscale And Finescale Variations Of Small Plankton In Coastal And Pelagic Environments, R. W. Owen Jan 1989

Microscale And Finescale Variations Of Small Plankton In Coastal And Pelagic Environments, R. W. Owen

Journal of Marine Research

Small-interval water sampling in oceanic subsurface layers in a variety of macroenvironments for microplankton and for characteristics of their environment revealed concentration variations that often exceed errors of sampling and measurement. I report incidence and degree of microscale and finescale organism patchiness and their dependency on the local environment and on certain characteristics of the organisms themselves. Scale analysis indicates that patchiness occurs below as well as above the 20 cm intervals sampled. Incidence and degree of patchiness were about the same in separate eastern boundary regions, off California and Perú. Effects of environmental characteristics on organism patchiness are clearly …

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Derivative Analysis Of Spectral Absorption By Photosynthetic Pigments In The Western Sargasso Sea, R. R. Bidigare, J. H. Morrow, D. A. Kiefer Jan 1989

Derivative Analysis Of Spectral Absorption By Photosynthetic Pigments In The Western Sargasso Sea, R. R. Bidigare, J. H. Morrow, D. A. Kiefer

Journal of Marine Research

Concurrent measurements of the spectral absorption coefficient and photosynthetic pigmentation of natural particulates were performed to determine the principal pigments responsible for the absorption of spectral irradiance in seawater. The spectral absorption coefficient, Ap(λ), was then analyzed by taking the second and fourth derivatives with respect to wavelength. The wavelength and magnitude of these derivative values provide useful information regarding the identification and quantification of phytoplankton pigments responsible for a given spectral signature. Linear relationships were examined and established between derivative values at selected wavelengths and concentrations of the major tetrapyrrole pigments, specifically chlorophylls a, b, and …

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Wind-Driven Ocean Circulation And Equilibrium Statistical Mechanics, Annalisa Griffa, Rick Salmon Jan 1989

Wind-Driven Ocean Circulation And Equilibrium Statistical Mechanics, Annalisa Griffa, Rick Salmon

Journal of Marine Research

In this paper, we show that numerical solutions of the single-layer quasigeostrophic equation in a beta-plane basin approach the state predicted by equilibrium statistical mechanics when the forcing and dissipation are (unrealistically) zero. This equilibrium state, which we call Fofonoff flow, consists of a quasi-steady uniform westward interior flow closed by inertial boundary layers. When wind stress and bottom drag are switched on, we find that the nonlinear terms in the quasigeostrophic equation still try to drive the flow toward Fofonoff flow, but their success at this depends strongly on the geometry of the wind stress. If the prescribed wind …

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On The Interaction Of Wind And Buoyancy Driven Gyres, Alain Colin De Verdière Jan 1989

On The Interaction Of Wind And Buoyancy Driven Gyres, Alain Colin De Verdière

Journal of Marine Research

The steady large scale oceanic response to wind stress and a surface buoyancy flux is studied by making use of a numerical model based upon the planetary geostrophic equations for which scales of motions smaller than the internal Rossby radius of deformation have been filtered out. In regions of both heat gain and Ekman convergence, the forcings combine to create a strong subtropical gyre in the upper thermocline. The north-south symmetry imposed by the wind pattern is broken because in a region of heat loss the density field shoals through the action of convection and the result is a broad …

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Large-Scale Sst Anomalies Associated With Subtropical Fronts In The Western North Atlantic During Fasinex, George R. Halliwell Jr., Peter Cornillon Jan 1989

Large-Scale Sst Anomalies Associated With Subtropical Fronts In The Western North Atlantic During Fasinex, George R. Halliwell Jr., Peter Cornillon

Journal of Marine Research

We describe the large-scale variability of sea surface temperature (Ts) and fronts in the western North Atlantic Subtropical Convergence Zone from January–June 1986 within an approximately 11° longitude by 10° latitude domain. Fronts were primarily found within interconnected bands separated by <500 km that tended to be located on the periphery of anisotropic Ts spatial anomaly features that propagated westward at about 3 km day–1. Relatively weak and strong (small or large |∇Ts|) segments of the dominant zonally-oriented frontal band (the Subtropical Frontal Zone, or SFZ) shifted westward with these anomaly features, which had characteristic peak-to-peak space scales of up to ≈800 km …

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Density Of The Major Size Groups Of Benthic Fauna And Trophic Input In Deep Basins Of The Atlantic Ocean, Myriam Sibuet, Claude E. Lambert, Roger Chesselet, Lucien Laubier Jan 1989

Density Of The Major Size Groups Of Benthic Fauna And Trophic Input In Deep Basins Of The Atlantic Ocean, Myriam Sibuet, Claude E. Lambert, Roger Chesselet, Lucien Laubier

Journal of Marine Research

Seven deep-sea areas were studied in the Atlantic Ocean. An intensive and comparable benthic sampling program was conducted during several deep-sea biology cruises with IFREMER research ships and mainly with the RV Jean Charcot, in the Norwegian Sea, the Bay of Biscay, the Porcupine Seabight, the Vema Fracture Zone, the Demerara abyssal plain, the Cape Verde Basin, the Angola and Cape basins near the Walvis Ridge. A synthesis of community structure data has been realized and the benthic fauna, quantitatively sampled, was separated into three main size categories (meiofauna, macrofauna sensu stricto and megafauna). Comparison of population densities in …

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Maximal Quantum Yield Of Photosynthesis In The Northwestern Sargasso Sea, J. S. Cleveland, M. J. Perry, D. A. Kiefer, M. C. Talbot Jan 1989

Maximal Quantum Yield Of Photosynthesis In The Northwestern Sargasso Sea, J. S. Cleveland, M. J. Perry, D. A. Kiefer, M. C. Talbot

Journal of Marine Research

The magnitude and variability of the maximal quantum yield of photosynthesis were examined in the northwestern Sargasso Sea in April 1985. Maximal quantum yield was calculated from light-limited photosynthetic rates and spectrally-weighted absorption coefficients. The absorption by total particulates collected on a glass fiber filter was partitioned into two components, one associated with living phytoplankton and one associated with other absorbing particles. Two types of maximal quantum yield were calculated: one from the absorption by total particulates and one from the absorption by the phytoplanktonic component alone. Maximal quantum yield calculated from absorption by total particulates was low [0.014 to …

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