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Full-Text Articles in Physical Sciences and Mathematics
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 …
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 …