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Evidence Of Infaunal Effects On Porewater Advection And Biogeochemistry In Permeable Sediments: A Proposed Infaunal Functional Group Framework, George G. Waldbusser, Roberta L. Marinelli
Evidence Of Infaunal Effects On Porewater Advection And Biogeochemistry In Permeable Sediments: A Proposed Infaunal Functional Group Framework, George G. Waldbusser, Roberta L. Marinelli
Journal of Marine Research
Bioturbating infauna significantly modify reaction and transport processes in permeable sediments, though most studies to date are limited in the scope of species examined. We conducted a comparative field study measuring density-dependent effects of six common bioturbating species on porewater advection and biogeochemistry, across three intertidal permeable sediment habitats. The species in this study are; head-down like deposit feeders (Abarenicola pacifica and Balanoglossus aurantiacus), surface deposit feeders (Diopatra cuprea and Onuphis jenneri) and gallery diffusers (Upogebia pugettensis and Neotrypaea californiensis). Tracer loss from gel diffusers was used to assess relative differences in porewater advection …
Early Diagenesis Of Chlorophyll-A In Long Island Sound Sediments: A Measure Of Carbon Flux And Particle Reworking, Mingyi Sun, Robert C. Aller, Cindy Lee
Early Diagenesis Of Chlorophyll-A In Long Island Sound Sediments: A Measure Of Carbon Flux And Particle Reworking, Mingyi Sun, Robert C. Aller, Cindy Lee
Journal of Marine Research
Sedimentary chlorophyll distributions reflect supply from primary production in overlying waters, transport during sedimentation/bioturbation, and alteration due to decomposition/transformation reactions. In Long Island Sound sediments, seasonal depth profiles of chlorophyll-a (Chl-a) often decreased exponentially within a few centimeters of the sediment-water interface, implying that initial decomposition rates of Chl-a were faster than surface sediment mixing rates. The highest surface sediment concentrations of Chl-a occurred in early spring, shortly after the spring bloom; the lowest concentrations occurred in summer. Chl-a was more concentrated at the shallow station (∼15 m) than at the deeper station (∼40 …
Simulation Of A Storm Event In Marine Microcosms, Candance A. Oviatt, Carlton D. Hunt, Gabriel A. Vargo, Kevin W. Kopchynski
Simulation Of A Storm Event In Marine Microcosms, Candance A. Oviatt, Carlton D. Hunt, Gabriel A. Vargo, Kevin W. Kopchynski
Journal of Marine Research
A storm of moderate intensity and lasting for 14 hours was simulated in three of the Marine Ecosystems Research Laboratory (MERL) microcosms by increasing the intensity of microcosm mixing. The simulation resuspended ~0.3 cm of sediment and increased suspended particulate loads by 2 orders of magnitude. Concurrently, the concentrations of metals and nutrients increased in the water column....
Models Of The Distribution Of 210pb In A Section Across The North Equatorial Atlantic Ocean, Derek W. Spencer, Michael P. Bacon, Peter G. Brewer
Models Of The Distribution Of 210pb In A Section Across The North Equatorial Atlantic Ocean, Derek W. Spencer, Michael P. Bacon, Peter G. Brewer
Journal of Marine Research
The deficiency of 210Pb relative to 226Ra in the world's deep ocean is well documented, and the overall residence time of 210Pb bas been calculated to be about 15-100 years. It has been assumed, generally, that the removal mechanism is one of in situ adsorption on settling particles, but Bacon et al. (1976) suggested that a boundary scavenging process with diffusive and advective fluxes of 210Pb from the interior ocean may be a significant factor....
In Situ Measurements Of Sea-Surface Film Potentials, P. M. Williams, E. S. Van Vleet, C. R. Booth
In Situ Measurements Of Sea-Surface Film Potentials, P. M. Williams, E. S. Van Vleet, C. R. Booth
Journal of Marine Research
A sensitive electrode system has been built for measuring in situ sea-surface potenti als from a mobile platform. The initial results of this study point out the patchy nature of the surface films in some "slick" areas as well as in non-"slick" regions, and illustrate the potential usefulness of this technique in measuring film formation and alteration rates.