Browsing Oceanography by Issue Date
Now showing items 41-60 of 152
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Biological processes and optical measurements near the sea surface: Some issues relevant to remote sensing
(1995)There is good evidence that bio-optical relationships are altered near the surface: (1) the fluorescence yield from chlorophyll declines, leading to bias in the estimation of pigment from fluorometry; (2) the modeled ... -
Methyl-Chloride (Ch3cl) Production in Phytoplankton Cultures
(1995-01)Unialgal nonaxenic cultures of seven species of phytoplankton, including both warm- and cold-water organisms, were examined under halocarbon-clean conditions for the production of CH3Cl. Incubations of all species showed ... -
Extinct spreading center in the Labrador Sea: Crustal structure from a two-dimensional seismic refraction velocity model
(1995-02/10)The Labrador Sea contains a rare example of an abandoned mid-ocean ridge where active accretion of oceanic crust ceased due to a change in the spreading geometry of lithospheric plates. Seismic refraction data were collected ... -
Effect of the nonlinearity of the carbonate system on partial pressure of carbon dioxide in the oceans
(1995-04)Partial pressure of CO sub(2) is a nonlinear function of several seawater properties. Due to the nonlinearity in this relationship, the partial pressure of a uniform ocean would be different from that of a nonuniform ocean ... -
Fine-Scale Vertical Resolution of Chlorophyll and Photosynthetic Parameters in Shallow-Water Benthos
(1995-06)The vertical distributions of chlorophyll concentration and photosynthetic parameters of sediment-associated microalgae were measured with a resolution of 1 mm. Sediment and the overlying water were sampled at 3 sandy, ... -
Crustal structure of the Labrador Sea conjugate margin and implications for the formation of nonvolcanic continental margins
(1995-12)Wide-angle seismic studies have determined the detailed velocity structure along a 350-km-long profile across the Labrador margin. Combination of this model with a previously published cross section for the southwestern ... -
The adjoint method of data assimilation used operationally for shelf circulation
(1996-02)A real-time shelf circulation model with data assimilation has been successfully used, possibly for the first time, on the outer Nova Scotian Shelf, The adjoint method was used to infer the time histories of flows across ... -
Extraction of tidal streams from a ship-borne acoustic Doppler current profiler using a statistical-dynamical model
(1996-04)We present a method for extracting the barotropic tide directly from the time-space series of horizontal velocity obtained by a ship-borne acoustic Doppler current profiler (ADCP). The method is conceptually straightforward, ... -
Bromoperoxidase and iodoperoxidase enzymes and production of halogenated methanes in marine diatom cultures
(1996-09)Halogenated methanes produced in the oceans are important as carriers of chlorine, bromine, and iodine into the atmosphere. There they play roles in the regulation of ozone in the stratosphere and perhaps in the Arctic ... -
A robust method for diagnosing regional shelf circulation from scattered density profiles
(1996-11)We present a straightforward method for estimating surface circulation on an f plane from a set of irregularly spaced vertical density profiles. The first step is to express bottom density rho(h) as the sum of a mean for ... -
Primary production by suspended and benthic microalgae in a turbid estuary: Time-scales of variability in San Antonio Bay, Texas
(1996-12)The within-day, between-day and month-to-month variability of light attenuation and microalgal chlorophyll a (chl a) and photosynthetic response was measured in San Antonio Bay, Texas, USA. Waters were shallow (<2 m) ... -
Vertical migration, nutrition and toxicity in the dinoflagellate Alexandrium tamarense
(1997)The effect of nitrate-N availability on paralytic shellfish toxin production by the dinoflagellate Alexandrium tamarense was studied in a vertically stratified laboratory water column (tank) where swimming behavior could ... -
Optical detection and assessment of algal blooms
(1997-07)Concerns about harmful algal blooms (HABs) have grown in recent years. There is a pressing need for robust, quantitative, and cost-effective methods to detect and characterize algal blooms. Critical applications of these ... -
Optical detection and assessment of algal blooms
(1997-07)Concerns about harmful algal blooms (HABs) have grown in recent years. There is a pressing need for robust, quantitative, and cost-effective methods to detect and characterize algal blooms. Critical applications of these ... -
Subtidal circulation on the Scotian Shelf: assessing the hindcast skill of a linear, barotropic model
(American Geophys. Union, 1997-11/15)Currents measured during the winter of 1985-1986 by four moorings on the inner Scotian Shelf are used to assess the hindcast skill of a three-dimensional circulation model forced by local wind stress and coastal sea level. ... -
Bioturbation and porosity gradients
(1998-01)Ubiquitous porosity gradients have a potentially important effect on the mixing of particle-bound tracers, such as Pb-210. Mass-depth coordinates cannot be used to deal with these effects if values of the traditional mixing ... -
Inhibition of marine photosynthesis by ultraviolet radiation: Variable sensitivity of phytoplankton in the Weddell-Scotia Confluence during the austral spring
(1998-05)To assess the potential impacts of ozone depletion on photosynthesis in the Southern Ocean, we need to know more about effects of ultraviolet radiation (UV) on phytoplankton in Antarctic waters, where, in addition to ... -
Mean mixed depth of sediments; the wherefore and the why
(American Society of Limnology and Oceanography, Ann Arbor, MI, 1998-05)No abstract available. -
Ocean-atmosphere exchange of methyl bromide: NW Atlantic and Pacific Ocean studies
(1998-07)Measurements of methyl bromide partial pressure and concentration in surface water and air samples in the NW Atlantic Ocean in July 1995 and the Pacific Ocean in October 1995 are presented, Mean atmospheric mixing ratios ... -
The spectral effects of clouds on solar irradiance
(1998-12)Knowledge of the spectral attenuation associated with clouds is important for accurate estimates of natural irradiance at the Earth's surface. We compare spectral measurements of visible downwelling irradiance, under varying ...