Oceanography: Recent submissions
Now showing items 121-140 of 152
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Mapping coastal optical and biogeochemical variability using an autonomous underwater vehicle and a new bio-optical inversion algorithm
(2004-08)Autonomous underwater vehicles (AUVs) can map water conditions at high spatial ( horizontal and vertical) and temporal resolution, including under cloudy conditions when satellite and airborne remote sensing are not feasible. ... -
Relationships between vertical mixing and photoadaptation of phytoplankton: Similarity criteria
(1984-03)In their natural environment phytoplankton are exposed to fluctuations in incident irradiance due to vertical displacements in the water column induced by turbulent fluid motion. A reaction-diffusion model is analyzed to ... -
Retrieval of phytoplankton biomass from simultaneous inversion of reflectance, the diffuse attenuation coefficient, and Sun-induced fluorescence in coastal waters
(2007-06)[1] A model has been developed to retrieve phytoplankton absorption, a proxy for phytoplankton biomass, from observations of reflectance ( R) and the diffuse attenuation coefficient (K-d) collected by moored radiometers ... -
New algorithms for MODIS sun-induced chlorophyll fluorescence and a comparison with present data products
(2005-02)We discuss important sources of variability in sun-induced chlorophyll fluorescence and examine difficulties in deriving fluorescence data products from satellite imagery, with a focus on the MODerate-resolution Imaging ... -
Calculation of UV attenuation and colored dissolved organic matter absorption spectra from measurements of ocean color
(American Geophysical Union, Washington, DC, 2003-09)No abstract available. -
Phytoplankton Growth and Light-Absorption as Regulated by Light, Temperature, and Nutrients
(1991-12)Numerous studies of the growth of phytoplankton in the laboratory have demonstrated the dependence of cellular pigment concentration and growth rate upon light intensity, photoperiod, temperature, and nutrient supply. These ... -
Impact of ultraviolet radiation on marine crustacean zooplankton and ichthyoplankton: a synthesis of results from the estuary and Gulf of St. Lawrence, Canada
(2000)The objectives of the research program reported upon here were (1) to measure ambient levels of UV radiation and determine which variables most strongly affected its attenuation in the waters of the estuary and Gulf of St. ... -
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Modeling the effects of ultraviolet radiation on embryos of Calanus finmarchicus and Atlantic cod (Gadus morhua) in a mixing environment
(2000-12)It is well established that ultraviolet radiation (UVR, 280-400 nm) harms aquatic organisms. Reductions in productivity have been reported for phytoplankton, ichthyoplankton, and zooplankton in incubations exposed to UVR. ... -
Ammonium Distribution in Southern-California Coastal Waters and its Role in the Growth of Phytoplankton
(1979)No abstract available. -
Status of the iron hypothesis after the open-ocean enrichment experiment
(1995)No abstract available. -
Distributions and Photosynthesis of Phototrophs in Sea-Surface Films
(1989-07)No abstract available. -
Predicting and verifying the intended and unintended consequences of large-scale ocean iron fertilization
(2008)Ocean iron fertilization (OIF) is being considered as a strategy for mitigating rising atmospheric CO2 concentrations. One model for implementation is the sale of carbon offsets. Modeling studies predict that OIF has the ... -
A Technique to Assess the Harmful Effects of Sampling and Containment for Determination of Primary Production
(1986-11)No abstract available. -
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 ... -
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 ... -
Photosynthetic characteristics and estimated growth rates indicate grazing is the proximate control of primary production in the Equatorial Pacific
(1992)Macronutrients persist in the surface layer of the equatorial Pacific Ocean because the production of phytoplankton is limited. Measurements of photosynthesis as a function of irradiance (P-I) provide information on the ... -
Hypotheses to Explain High-Nutrient Conditions in the Open Sea
(1991-12)Oceanic high-nutrient, low-chlorophyll waters are characterized principally by the persistence of major nutrients at the sea surface. This condition indicates control of autotrophic production by something other than NO3 ... -
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 ...