Browse by Archive
ScholarsArchive at Oregon State University
|
A volcanic event of immense scale occurred within a relatively short period in early Jurassic time over large regions of the contiguous Gondwana supercontinent. In southern Africa, associated remnants of thick volcanic successions of lava flows...
1997-08-10 (iso8601)
|
|
In SW Colombia picritic pillow lavas and tuffs, as well as breccias composed of picritic clasts, occur interspersed with basalts of the Central Cordillera and represent accreted portions of the similar to 90 Ma Colombian/Caribbean oceanic plateau...
2002-07-24 (iso8601)
|
|
Bathymetry and gravity data collected during Legs 5, 6, and 7 of the 1993 GLORIA Expedition and the recently released 2-min altimetry-derived global gravity grid are used to determine the effective elastic thickness of the lithosphere along the...
1997-12-10 (iso8601)
|
|
Within the Australian-Antarctic Discordance (AAD), a boundary exists between isotopically defined “Pacific-type” and “Indian-type” mid-ocean ridge basalt (MORB) erupted along the Southeast Indian Ridge (SEIR). This boundary has migrated westward...
1995-11-10 (iso8601)
|
|
Lavas from seamounts of the central Galápagos Platform and the Carnegie Ridge increase in age with distance from the western edge of the platform, consistent with a hotspot model for the generation of these features. The areal distribution of...
1996-06-10 (iso8601)
|
|
The pre-Tertiary oceanic crust exposed on the west coast of Costa Pica has been broadly referred to as the Nicoya Complex. This study was designed to determine the age of the Nicoya Complex in the Nicoya Peninsula, Playa Jaco, and the Quepos...
1997-07-10 (iso8601)
|
|
We use Ar-40-Ar-39 incremental heating to fingerprint bulk fluvial sediment entering the northeast Pacific Ocean, with the long-term intent of tracking sediment source and transport changes from the terrestrial system to the marine environment...
2006-12-27 (iso8601)
|
|
High concentrations of chlorophyll are found in the California Current System over
300 km offshore, far from the productive coastal upwelling region, and between 150 and
250 m, well below the depth to which photosynthetically active solar...
2002 (iso8601)
|
|
During summer 2001, high-resolution hydrographic, velocity, and bio-optical surveys
were conducted over Heceta Bank off central Oregon. North of the bank, upwelling
over simple bottom topography exhibited a classic response with a midshelf,...
2005 (iso8601)
|
|
Equatorward velocities in the upwelling jet of the
northern California Current were 0.05–0.06 m s¯¹ faster in
spring and summer 2002 than on average over 1998–2002.
This result is based on a five-year data set of surface drifters
released across...
2003 (iso8601)
|
|
The stability of a coastal jet and front is investigated using the primitive
equations applied to a continuously stratified flow in geostrophic balance. A linear
stability analysis successfully explains the growth of two modes of instability with...
1994-08-15 (iso8601)
|
|
Observations of internal solitary waves (ISWs) and of their role in sediment
resuspension during the Coastal Mixing and Optics 1996 (CMO 96) experiment are
reported. The largest resuspension events observed in the experiment can be related to...
2005 (iso8601)
|
|
Data from the SeaWinds scatterometer on the
QuikSCAT satellite are used to estimate upwelling around
Cabo Frio, Brazil, due to Ekman transport and Ekman
pumping. The region close to shore (up to 200 km from the
coast) is characterized by negative...
2006 (iso8601)
|
|
Cold air drainage and pooling occur in many mountain valleys, especially at night and during winter. Local
climate regimes associated with frequent cold air pooling have substantial impacts on species phenology, distribution and
diversity....
2009 (iso8601)
|
|
Repeated mesoscale surveys of waters over the shelf and slope off Oregon were
conducted during spring and summer of 2001 to study the spatial structure of the velocity
and hydrographic fields. The ocean response to wind forcing is compared between...
2005 (iso8601)
|
|
Data from Geostationary Operational Environmental
Satellites are used to study the seasonal evolution of
temperature fronts in the northern California Current
System (CCS), focusing on the interactions with
topographic features. Fronts first...
2005 (iso8601)
|
|
Sea surface temperature (SST) fronts are determined for the 2001–2004 time period
from Geostationary Operational Environmental Satellites (GOES) data in the California
Current System (CCS). The probability of detecting a SST front at an individual...
2006 (iso8601)
|
|
Variability of solar-induced (natural) fluorescence and chlorophyll were measured on scales of hours to weeks in the upper layer of a cyclonic eddy located south of the Antarctic Polar Front using a free-floating drifter. The fluorescence signal...
1997 (iso8601)
|
|
Satellite thermal imagery and in situ biological and physical data are presented that describe the spatial variability of phytoplankton biomass and species composition in relation to the physical structure at the sea surface during persistent...
1990 (iso8601)
|
|
Satellite-derived pigment concentrations from the west coast time series (WCTS) are averaged into monthly mean fields over the California Current system (CCS) for the period July 1979 to June 1986. Errors caused by the scattering algorithm used in...
1990 (iso8601)
|
|
We use a 4-year time series of high-resolution coastal zone color scanner imagery to study mesoscale variability in phytoplankton pigment (as a surrogate for biomass) distributions off central California during the spring–summer upwelling season....
1991 (iso8601)
|
|
In June 1987 the geostropic flow in the coastal transition zone off northern California (between 50 and 150 km off the coast from Point Reyes to just north of Cape Mendocino) was dominated by a well-defined, southward-meandering current. Three...
1991 (iso8601)
|
|
Two years of satellite infrared imagery (1984–1986) are used to examine the sea surface temperature (SST) variability in the northern Gulf of California. Empirical orthogonal functions (EOFs) of the temporal and spatial SST variance for 20 monthly...
1991 (iso8601)
|
|
During the summers of 1987 and 1988, 77 near-surface satellite-tracked drifters were deployed in or near cold filaments near Point Arena, California (39ºN), and tracked for up to 6 months as part of the Coastal Transition Zone (CTZ) program. The...
1991 (iso8601)
|
|
Physical and biological fields in the coastal transition zone off northern California were measured during February, March, May and June 1987 in an extended alongshore region between 60 km and 150 km offshore. The spring transition, as seen in...
1991 (iso8601)
|
