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ScholarsArchive at Oregon State University
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The results of high-resolution biogeochemical measurements in the upper 200 m of
the Ross Sea, Antarctica, obtained during the AESOPS (U. S. JGOFS) program using the
Lamont Pumping SeaSoar (LPS) are presented. They consist of three west-east...
2004-07-27 (iso8601)
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A biological pump for transferring atmospheric CO₂ to deep ocean regimes has been
identified in the upwelling zone of the U.S. Pacific coast off Oregon using high-resolution
measurements of Pco₂ and nutrient concentrations that were made in May...
2005-02-02 (iso8601)
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We examined high-resolution cross-shelf distributions of particulate organic carbon
(POC) and dissolved O₂ during the upwelling season off the Oregon coast. Oxygen
concentrations were supersaturated in surface waters, and hypoxic in near-bottom...
2006-07-06 (iso8601)
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Detailed and repeated measurements of nitrate across the Oregon shelf, made
coincident with turbulence measurements, reveal the importance of cross-isopycnal
mixing via turbulence in providing nitrate to the upper water column. Spatial...
2005-10-13 (iso8601)
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We present observations from deployments of a microstructure turbulence instrument
(the Towed Microstructure and Auxiliary Sensor Instrument) aboard a pumping profiling
vehicle (the Lamont Pumping SeaSoar) towed behind a research vessel at the...
2009-05-13 (iso8601)
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To investigate CO₂ chemistry in ocean water with greater time-space resolutions, we developed measurement
systems, which have state-of-the-art precision but an order of magnitude or better increase in the frequency of
analysis, for carbon dioxide...
2004-11 (iso8601)
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We adapted a commercially available flow-injection autoanalyzer (Lachat Quik-Chem 8000) to measure seawater
nitrate concentrations at a rate of nearly 0.1 Hz and phosphate and silicate concentrations at a rate half
that. Several minor...
2004-03 (iso8601)
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Here I synthesize the results of several types of measurements of organic carbon respiration and calcium
carbonate dissolution rates in pelagic seafloor sediments. Measurements of pore water oxygen demonstrate that
most of the respiration takes...
2003-12-18 (iso8601)
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We developed a multiple linear regression model to
robustly determine aragonite saturation state (Ωarag) from
observations of temperature and oxygen (R² = 0.987, RMS
error 0.053), using data collected in the Pacific Northwest
region in late May...
2009-12-31 (iso8601)
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At least nine WNW trending left-lateral strike-slip faults have been mapped on the Oregon-Washington continental margin using sidescan sonar, seismic reflection, and bathymetric data, augmented by submersible observations. The faults range in...
1997-04-10 (iso8601)
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We have mapped a recently active left-lateral strike-slip fault (the Wecoma fault) on the floor of Cascadia Basin west of the Oregon convergent margin, using SeaMARC I sidescan sonar, Seabeam bathymetry and multichannel seismic and magnetic data....
1992-06 (iso8601)
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Global Positioning System vectors and surface
tilt rates are inverted simultaneously for the rotation of western
Oregon and plate locking on the southern Cascadia subduction
thrust fault. Plate locking appears to be largely
offshore, consistent...
2000-10-01 (iso8601)
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Analysis of multichannel seismic reflection profiles reveals that listric normal faulting is widespread on the northern Oregon and Washington continental shelf and upper slope, suggesting E-W extension in this region. Fault activity began in the...
1997-06-10 (iso8601)
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High-precision GPS geodesy in the Pacific
Northwest provides the first synoptic view of the along-strike
variation in Cascadia margin kinematics. These results constrain
interfering deformation fields in a region where typical
earthquake...
2001-04 (iso8601)
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We have collected data during eight separate research cruises from open ocean to estuarine oceanic environments. Inherent optical property data collected during these cruises were incorporated into a large database totaling 1914 samples. The range...
1998-10-15 (iso8601)
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Measurements of inherent optical properties (IOP) were conducted over bottoms with different substrates by use
of a sampling package mounted on and operated by a SCUBA diver. It was found that in areas of low ambient
currents the distribution of...
2003-01 (iso8601)
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Optical properties of dissolved (colored dissolved organic material (CDOM)) and particulate matter and hydrographic measurements were obtained at the Mid-Atlantic Bight during the fall of 1996 and the spring of 1997 as part of the Coastal Mixing...
2001-05-15 (iso8601)
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Spectral attenuation and absorption coefficients of particulate matter and collocated hydrographic measurements were obtained in the Mid-Atlantic Bight during the fall of 1996 and the spring of 1997 as part of the Coastal Mixing and Optics...
2001-05-15 (iso8601)
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In situ attenuation (488 and 660 nm), absorption (488, 676, and 750 nm), backscattering (at 488 nm), and
stimulated fluorescence were determined as functions of depth in oceanic and coastal waters off Oregon,
using both commercial instruments and...
1995-03 (iso8601)
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Two methods to alleviate the problem of fouling of moored flow tube optical instruments are presented. A chemical method diffuses a concentrated solution of bromine into the flow tube between sampling periods, creating a toxic environment for...
1997-03-15 (iso8601)
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We report paleointensity results of the Earth's
magnetic field from n Late Pleistocene lava flow
(Louchadiere, Central France), which recorded an intermediate
geomagnetic field direction (5 sites, mean declination=
114.1°, inclination=58.2°,...
1989-10 (iso8601)
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A volcanic sequence almost 700 meters thick has been sampled in the Punaruu valley on the island of
Tahiti, southern central Pacific Ocean. Detailed paleomagnetic results have been obtained from 123 sites. Three
reversals are recorded in this...
1990-03-10 (iso8601)
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Full-coverage multibeam bathymetric mapping of twelve seamounts in the Gulf of Alaska reveals that
they are characterized by flat-topped summits (rarely with summit craters) and by terraced, or step-bench,
flanks. These summit plateaus contain...
2007-09-29 (iso8601)
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Paleomagnetic directions from the Eocene Tillamook Volcanic Series of the Oregon Coast Range
point 460 clockwise from the expected Eocene field direction. Potassium argon dating of six dikes and
flows from this formation yields a mean age of 44.3...
1981-04-10 (iso8601)
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Cobb hotspot, currently located beneath Axial seamount on the Juan de Fuca ridge, has the temporal
but not the isotopic characteristics usually attributed to a mantle plume. The earlier volcanic products of
the hotspot, from eight volcanoes in the...
1990-08-10 (iso8601)
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