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ScholarsArchive at Oregon State University
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We present a modeling study of the upwelling ocean circulation off
central Chile (34°-40°S). Using a primitive equation model, we make a numerical
simulation of the ocean circulation for summer of 1993, a year characterized by
moderate but...
2001-09-15 (iso8601)
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In this article we analyze the momentum and vorticity balances of a numerical
simulation of the upwelling circulation off central Chile (34° –40°S) and its response to
interannual local wind changes. Our analysis indicates that the path of the...
2003 (iso8601)
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Improved interpretations of the strength of the San
Andreas Fault near Parkfield, CA based on thermal data
require quantification of processes causing significant
scatter and uncertainty in existing heat flow data. These
effects include...
2004 (iso8601)
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The objective of this study is to evaluate the performance of several
open boundary conditions applied to the Princeton ocean model. The focus is on
passive open boundary conditions applied to the external mode, i.e., conditions that
are applied...
1998-01-15 (iso8601)
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Tl1is article discusses the results of an experimental survey on the
performance of a select group of open boundary conditions (OBCs) for three-dimensional,
primitive equation models. The focus is on passive conditions, where
the model response at...
2000-04-15 (iso8601)
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We compare the oceanic circulation patterns over the
Southwestern Atlantic Shelf (SWAS) forced by nine
different wind stress climatologies. The largest differences
are observed in experiments forced with the Hellerman
and Rosenstein [1983,...
2004 (iso8601)
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This article analyzes the barotropic circulation in the Southwestern Atlantic Shelf using
a three-dimensional numerical model forced with winds and tides. South of 40°S, the shelf
circulation is dominated by the propagation of the semidiurnal...
2004 (iso8601)
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This article discusses the results of a suite of numerical simulations of the oceanic
circulation in the Southwestern Atlantic Shelf region that are aimed to characterize its
mean circulation and seasonal variability and to determine the dynamical...
2008 (iso8601)
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The influence of the Plata, the second largest river in
South America, extends along a coastal strip of 1300 km.
Historical hydrographic and wind data and numerical
simulations are combined to determine the seasonal and
interannual variability of...
2005 (iso8601)
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The formation mechanisms and pathways of intermediate water in the Southern Ocean
are analyzed from output of a high-resolution ocean general circulation model. Deep
winter mixed layer formation in the Southern Ocean is diagnosed from the model...
2006 (iso8601)
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Satellite-derived data provide the temporal means and seasonal and nonseasonal
variability of four physical and biological parameters off Oregon and Washington
(41°–48.5°N). Eight years of data (1998–2005) are available for surface chlorophyll...
2008 (iso8601)
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Monthly composite images from the global coastal zone color scanner
(CZCS) data set are used to provide an initial illustration and comparison of seasonal
and interannual variability of phytoplankton pigment concentration along the western
coasts...
1994-04-15 (iso8601)
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Time series of satellite measurements are used to describe patterns of surface
temperature and chlorophyll associated with the 1996 cold La Nina phase and the 1997-1998
warm El Nino phase of the El Nino - Southern Oscillation cycle in the...
2001-01-15 (iso8601)
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Over 30 years of hydrographic data from the northern Chile (18°S-24°S) upwelling
region are used to calculate the surface and subsurface seasonal climatology extending 400 km
offshore. The data are interpolated to a grid with sufficient spatial...
2001-06-15 (iso8601)
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The evolution of oceanographic conditions in the upwelling region off northern Chile
(18°–24°S) between 1996 and 1998 (including the 1997–1998 El Niño) is presented using
hydrographic measurements acquired on quarterly cruises of the Chilean...
2002 (iso8601)
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Mean fields, seasonal cycles, and interannual variability are examined for fields of
satellite-derived chlorophyll pigment concentrations (CHL), sea surface height (SSH), and
sea surface temperature (SST) during 1997–2002. The analyses help to...
2004 (iso8601)
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High-resolution three-dimensional (3-D) seismic reflection data acquired on the R/V
Thomas G. Thompson in 2000 reveal a pair of bottom simulating reflections (BSRs) across
a broad region of southern Hydrate Ridge, offshore Oregon. The primary BSR...
2005-03-26 (iso8601)
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As the Mendocino Triple Junction migrates northward along the California margin it is widely presumed to leave a "slab-free" or "asthenospheric" window in its wake. A 250-km-long south-north seismic refraction-reflection profile crossing the...
1998-12-10 (iso8601)
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Seismic reflection profiles shot across the Cascadia
forearc show that a 5–15 km thick band of reflections,
previously interpreted as a lower crustal shear zone above
the subducting Juan de Fuca plate, extends into the upper
mantle of the North...
2003-12-05 (iso8601)
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Models of magnetic and gravity anomalies along two E-W transects offshore central Oregon, one of which is coincident with a detailed velocity model, provide quantitative limits on the structure of the subducting oceanic crust and the crystalline...
1999-09-10 (iso8601)
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The Gorda Escarpment is a north facing scarp immediately south of the Mendocino transform fault (the Gorda/Juan de Fuca-Pacific plate boundary) between 126°W and the Mendocino triple junction. It elevates the seafloor at the northern edge of the...
1998-10-10 (iso8601)
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Wide-angle and vertical incidence seismic data from Seismic Hazards Investigations
in Puget Sound (SHIPS), gravity modeling, and seismicity are used to derive two-dimensional
crustal models beneath the Strait of Juan de Fuca. The Eocene volcanic...
2003-10-17 (iso8601)
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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...
2003-06-26 (iso8601)
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Although satellite electromagnetic induction studies
have usually assumed a symmetric magnetospheric ring
current source, there is growing evidence for significant
source asymmetry. Here we apply empirical orthogonal
function methods to...
2006 (iso8601)
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The current satellite magnetic missions offer new
opportunities to determine the electrical conductivity of the
Earth. However, satellites are nearly stationary in local time
and therefore sample the inducing and induced fields quite
differently...
2004 (iso8601)
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