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Physical Sciences and Mathematics Commons™
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Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Observing Biogeochemical Cycles At Global Scales With Profiling Floats And Gliders: Prospects For A Global Array, Kenneth S. Johnson, William M. Berelson, Emmanuel S. Boss, Zanna Chase, Hervé Claustre, Steven R. Emerson, Nicolas Gruber, Arne Körtzinger, Mary Jane Perry, Stephen C. Riser
Observing Biogeochemical Cycles At Global Scales With Profiling Floats And Gliders: Prospects For A Global Array, Kenneth S. Johnson, William M. Berelson, Emmanuel S. Boss, Zanna Chase, Hervé Claustre, Steven R. Emerson, Nicolas Gruber, Arne Körtzinger, Mary Jane Perry, Stephen C. Riser
Marine Sciences Faculty Scholarship
Chemical and biological sensor technologies have advanced rapidly in the past five years. Sensors that require low power and operate for multiple years are now available for oxygen, nitrate, and a variety of bio-optical properties that serve as proxies for important components of the carbon cycle (e.g., particulate organic carbon). These sensors have all been deployed successfully for long periods, in some cases more than three years, on platforms such as profiling floats or gliders. Technologies for pH, pCO 2, and particulate inorganic carbon are maturing rapidly as well. These sensors could serve as the enabling technology for a global …
Teaching Physical Concepts In Oceanography: An Inquiry-Based Approach, Lee Karp-Boss, Emmanuel Boss, Herman Weller, James Loftin, Jennifer Albright
Teaching Physical Concepts In Oceanography: An Inquiry-Based Approach, Lee Karp-Boss, Emmanuel Boss, Herman Weller, James Loftin, Jennifer Albright
Marine Sciences Faculty Scholarship
This supplement to Oceanography magazine focuses on educational approaches to help engage students in learning and offers a collection of hands-on/minds-on activities for teaching physical concepts that are fundamental in oceanography. These key concepts include density, pressure, buoyancy, heat and temperature, and gravity waves. We focus on physical concepts for two reasons. First, students whose attraction to marine science stems from an interest in ocean organisms are typically unaware that physics is fundamental to understanding how the ocean, and all the organisms that inhabit it, function. Second, existing marine education and outreach programs tend to emphasize the biological aspects of …
Effect Of Particulate Aggregation In Aquatic Environments On The Beam Attenuation And Its Utility As A Proxy For Particulate Mass, Emmanuel Boss, Wayne Slade, Paul Hill
Effect Of Particulate Aggregation In Aquatic Environments On The Beam Attenuation And Its Utility As A Proxy For Particulate Mass, Emmanuel Boss, Wayne Slade, Paul Hill
Marine Sciences Faculty Scholarship
Marine aggregates, agglomerations of particles and dissolved materials, are an important particulate pool in aquatic environments, but their optical properties are not well understood. To improve understanding of the optical properties of aggregates, two related studies are presented. In the first, an in situ manipulation experiment is described, in which beam attenuation of undisturbed and sheared suspensions are compared. Results show that in the sheared treatment bulk particle size decreases and beam attenuation increases, consistent with the hypothesis that a significant fraction of mass in suspension is contained in fragile aggregates. Interestingly, the magnitude of increase in beam attenuation is …
Turbulence-Plankton Interactions: A New Cartoon, Peter A. Jumars, John H. Trowbridge, Emmanuel Boss, Lee Karp-Boss
Turbulence-Plankton Interactions: A New Cartoon, Peter A. Jumars, John H. Trowbridge, Emmanuel Boss, Lee Karp-Boss
Marine Sciences Faculty Scholarship
Climate change redistributes turbulence in both space and time, adding urgency to understanding of turbulence effects. Many analytic and analog models used to simulate and assess effects of turbulence on plankton rely on simple Couette flow. There shear rates are constant and spatially uniform, and hence so is vorticity. Over the last decade, however, turbulence research within fluid dynamics has focused on the structure of dissipative vortices in space and time. Vorticity gradients, finite net diffusion of vorticity and small radii of curvature of streamlines are ubiquitous features of turbulent vortices at dissipation scales but are explicitly excluded from simple, …
Acceptance Angle Effects On The Beam Attenuation In The Ocean, Emmanuel Boss, Wayne H. Slade, M. Behrenfeld, G. Dall'olmo
Acceptance Angle Effects On The Beam Attenuation In The Ocean, Emmanuel Boss, Wayne H. Slade, M. Behrenfeld, G. Dall'olmo
Marine Sciences Faculty Scholarship
The beam attenuation serves as a proxy for particulate matter and is a key parameter in visibility algorithms for the aquatic environment. It is well known, however, that the beam attenuation is a function of the acceptance angle of the transmissometer used to measure it. Here we compare eight different transmissometers with four different acceptance angles using four different deployment strategies and sites, and find that their mean attenuation values differ markedly and in a consistent way with instrument acceptance angle: smaller acceptance angles provide higher beam attenuation values. This difference is due to variations in scattered light collected with …