Index Catalog // ScholarsArchive@OSU

Creator:: Collier, Robert W., Dymond, Jack, Oregon State University. College of Oceanography, and Cooperative Park Studies Unit (Corvallis, Or.)
Resource Type:: Technical Report

Creator:: Alleau, Y., Colbert, D., Covert, P., Haley, Brian A., Qiu, X., Collier, Robert W., Falkner, Kelly, Hales, Burke, Prahl, Fredrick, and Gordon, L.
Abstract:: It has been recognized since the 1950's that radioisotopic disequilibrium between naturally occurring parent-daughter isotope pairs in seawater can provide information on the rate of processes segregating them. In the surface ocean, the U-238:Th-234 parent-daughter pair tends to display measurable disequilibrium that is attributable to the effects of scavenging on...
Resource Type:: Article

Creator:: McManus, James, Collier, Robert W., and Dymond, Jack
Abstract:: Subsurface hydrothermal activity dominates the heat and salt budgets of the deep water column in Crater Lake, Oregon. From a time series of conductivity-temperature-depth data and data from a thermistor chain mooring, we estimate that the net hydrothermal heat flow is ~1 W m⁻² and the corresponding salt flux is...
Resource Type:: Article

Creator:: Wheat, C. Geoffrey, McManus, James, Dymond, Jack, Collier, Robert W., and Whiticar, Michael
Abstract:: We present evidence for pore water flow through the sediment of Crater Lake, Oregon based on systematic variations in pore water chemical compositions and thermal gradients. Pore water was extracted from sediment by centrifugation and diffusive exchange using a gravity corer deployed from a surface vessel and a box corer...
Resource Type:: Article

Creator:: Heeschen, Katja U., Collier, Robert W., de Angelis, Marie A., Suess, Erwin, Rehder, Gregor, Linke, Peter, and Klinkhammer, Gary P.
Abstract:: To constrain the fluxes of methane (CH4) in the water column above the accretionary wedge along the Cascadia continental margin, we measured methane and its stable carbon isotope signature (δ¹³C-CH₄). The studies focused on Hydrate Ridge (HR), where venting occurs in the presence of gas-hydrate-bearing sediments. The vent CH₄ has...
Resource Type:: Article

Creator:: Collier, Robert W. and Lilley, Marvin D.
Abstract:: Methane reservoirs and seeps are an active component of the continental margin carbon budget and represent a poorly characterized pathway for reduced carbon cycling and methane input to the atmosphere. Active gas seeps from three shelf settings on the Cascadia Continental Margin off Oregon and Northern California contain nearly pure...
Resource Type:: Article

Creator:: Heeschen, Katja U., Tréhu, Anne Martine, Collier, Robert W., Suess, Erwin, and Rehder, Gregor
Abstract:: Submersible investigations of the Cascadia accretionary complex have identified localized venting of methane gas bubbles in association with gas hydrate occurrence. Acoustic profiles of these bubble plumes in the water column in the vicinity of Hydrate Ridge offshore Oregon provide new constraints on the spatial distribution of these gas vents...
Resource Type:: Article

Creator:: Ortiz, Joseph D., Mix, Alan C., and Collier, Robert W.
Abstract:: Plankton tows from the northern California Current constrain biological and physical influences on living planktonic foraminifera. In this region, the dominant factors controlling the size and distribution of symbiotic and asymbiotic species are light and food. Food decreases offshore. Light, needed for symbiont photosynthesis, increases offshore as water turbidity lessens....
Resource Type:: Article

Creator:: Collier, Robert W., Dymond, Jack, and McManus, James
Abstract:: As a result of the past three years of field studies and our interpretation of these and other data from the literature, we conclude that there are inputs of hydrothermal fluids into the bottom of Crater Lake. The dissolved materials associated with these thermally and chemically enriched fluids, coupled with...
Resource Type:: Technical Report

Creator:: McManus, James, Collier, Robert W., Chen, Chen-Tung A., and Dymond, Jack
Abstract:: Active inputs of thermally and chemically enriched fluids at the bottom of Crater Lake create small vertical and horizontal heterogeneities in the deep-lake temperature and salt distribution. Using an internally recording CTD and a precise definition for salinity as a function of in situ conductivity and temperature, we assess the...
Resource Type:: Article

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