Index Catalog // ScholarsArchive@OSU

Creator:: Duncan, Robert A. and Hogan, L. G.
Abstract:: Determination of reliable crystallization ages by K-Ar methods for young (<1 Ma), fresh basalts from the seafloor has been frustrated by several effects. The small amounts of radiogenic ⁴⁰Ar developed over these timescales in such low-K rocks are difficult to resolve from predominantly atmospheric ⁴⁰Ar. An additional concern is that...
Resource Type:: Article
Full Text:: Heating Method R.A. Duncan and L.G. Hogan College of Oceanic and Atmospheric Sciences, Oregon State

Creator:: Chauvin, Annick, Duncan, Robert A., Bonhommet, Norbert, and Levi, Saul
Abstract:: 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°, k=130, α95=6.7°). New K-Ar age determinations confirm that this flow is contemporaneous with the Laschamp and Olby flows, and...
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Full Text:: Paleointensity of the Earth's Magnetic Field and K&hyphen

Creator:: Fried, M. J., Catania, G. A., Bartholomaus, T. C., Duncan, D., Davis, M., Stearns, L. A., Nash, J., Shroyer, E., and Sutherland, D.
Abstract:: Submarine melt can account for substantial mass loss at tidewater glacier termini. However, the processes controlling submarine melt are poorly understood due to limited observations of submarine termini. Here at a tidewater glacier in central West Greenland, we identify subglacial discharge outlets and infer submarine melt across the terminus using...
Resource Type:: Article
Full Text:: ., Bartholomaus, T. C., Duncan, D., Davis, M., Stearns, L. A., ... & Sutherland, D. (2015). Distributed

Creator:: Fetter, A., Lutjeharms, J. R. E., and Matano, Ricardo P.
Abstract:: The Agulhas Current is the western boundary current of the South Indian Ocean and is thought to play an important role in the global overturning circulation. In this study, we investigate the contribution from the wind stress field over each ocean basin of the southern hemisphere to the variability of...
Resource Type:: Article
Full Text:: of experiments using the Modular Ocean Model 2. The model grid extends from 20�S to 70�S and has a

Creator:: Braunmiller, Jochen and Nábělek, John L.
Abstract:: Broadband body waves recorded at 15 digital seismic stations worldwide are used to study the rupture process of the May 23, 1989 Macquarie Ridge earthquake. The centroidal solution (strike 211°, dip 86°, rake 180°, and depth of 10 km below the seafloor) indicates shallow rupture with pure right-lateral strike-slip motion...
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Full Text:: , and S. Stein, Current plate motions, Geophys. J. Int., in press. Duncan, R. A., and R. Vame, The

Creator:: Patro, Prasanta K. and Egbert, Gary D.
Abstract:: In conjunction with the USArray component of EarthScope, long period magnetotelluric (MT) data are being acquired in a series of arrays across the continental US. Initial deployments in 2006 and 2007 acquired data (10– 10,000 s) at 110 sites covering the US Pacific Northwest, distributed with the same nominal spacing...
Resource Type:: Article
Full Text:: in 2006 and 2007 acquired data (10– 10,000 s) at 110 sites covering the US Pacific Northwest

Creator:: Wheeler, Patricia A., Huyer, Adriana, 1945-, and Fleischbein, Jane
Abstract:: Observed changes in the nutrient levels in the halocline of the California Current during 2002 indicated a natural eutrophication that was accompanied by increased chlorophyll and oxygen in surface water. Decreased oxygen in the lower water column over the shelf indicated that much of the phytoplankton production was respired rather...
Resource Type:: Article
Full Text:: . Special thanks to Julie Arrington, Erin Clark, Jennifer Harman, Kerry Mammone, Katie Reser, Jennifer

Creator:: Bi, Hongsheng, Peterson, William T., and Strub, Paul T.
Abstract:: Alongshore transport was estimated from the gridded AVISO altimeter data and water level data from NOAA tide gauges (1993–2010) for the northern California Current (NCC) system. The biomass of the cold neritic copepods including Calanus marshallae, Pseudocalanus mimus and Acartia longiremis (dominants in the eastern Bering Sea, coastal Gulf of...
Resource Type:: Article
Full Text:: processing of data: Craig Risien, Jay Peterson, Leah Feinberg, Tracy Shaw, Jennifer Menkel, Rian Hooff, Karen

Creator:: Klymak, Jody M. and Moum, James N.
Abstract:: A sequence of three internal solitary waves of elevation were observed propagating shoreward along a near-bottom density interface over Oregon’s continental shelf. These waves are highly turbulent and coincide with enhanced optical backscatter, consistent with increased suspended sediments in the bottom boundary layer. Nonlinear solitary wave solutions are employed to...
Resource Type:: Article
Full Text:: ). Narrow-band acoustic Doppler profiler (ADP, 150 kHz RD Instruments) data is initially smoothed 150 s

Creator:: Harris, Robert N. and Wang, Kelin
Abstract:: We present thermal models of the 24 Ma Cocos plate subducting under the Caribbean plate at the Nicoya Peninsula, Costa Rica. Our modeling incorporates the effect of hydrothermal cooling of the seafloor and the absence of an accretionary prism. Initial geotherms of the incoming plate, representing different effective cooling depths...
Resource Type:: Article
Full Text:: . Ranero, R. von Huene, S. C. Cande, and H. A. Roeser, Revised tectonic boundaries in the Cocos Plate off

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