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ScholarsArchive at Oregon State University
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Subduction zone earthquake and tsunami hazards affect tens of millions worldwide and the recurrence of these disasters can be evaluated with paleoseismic techniques, because earthquake cycles (and their supercycles) typically span many millennia....
2014-01-09 (iso8601)
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Microzooplankton grazing impact on phytoplankton in the Bering Sea during spring was
assessed in 2008, 2009 and 2010 using two-point dilution assays. Forty-nine experiments were
completed in a region encompassing shelf to slope waters, including...
2013-10-01 (iso8601)
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Analogous to ocean surface waves, waves in the ocean interior also experience steepening, breaking, and dissipation as they approach the coastline. Much less is known about this internal beach. In this work, extensive moored Acoustic Doppler...
2014-01-29 (iso8601)
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Humpback whales (Megaptera novaeangliae) are vocal baleen whales that exhibit complex social interactions that vary spatially and seasonally. Across their range, humpback whales produce a wide array of vocalizations including ‘song’, foraging...
2014-01-10 (iso8601)
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A novel, low-cost instrument capable of measuring surface water PCO₂ was designed for use in dynamic, shallow-water environments. The instrument was tested in the Yaquina River Estuary, a macrotidal estuary known to experience a wide range of...
2014-01-14 (iso8601)
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Investigations of the behavior of the geomagnetic field on geological timescales rely on globally
distributed data sets from dated lava flows. We present the first suitable data from the Arctic region,
comprising 37 paleomagnetic directions from...
2013-08-30 (iso8601)
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The climate sensitivity uncertainty of global climate models (GCMs) is partly due to the spread of individual
feedbacks. One approach to constrain long-term climate sensitivity is to use the relatively short
observational record, assuming there...
2013-12-15 (iso8601)
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The effects of solar radiation diurnal cycle on intraseasonal mixed layer variability in
the tropical Indian Ocean during boreal wintertime Madden-Julian Oscillation (MJO) events
are examined using the HYbrid Coordinate Ocean Model. Two parallel...
2013-10-03 (iso8601)
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During the discovery and description of seven New Zealand methane seep sites, an infaunal assemblage
dominated by ampharetid polychaetes was found in association with high seabed methane emission. This
ampharetid-bed assemblage had a mean density...
2013-09 (iso8601)
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Data from large-scale biological inventories are essential for understanding and managing Earth's ecosystems.
The Forest Inventory and Analysis Program (FIA) of the U.S. Forest Service is the largest biological inventory in
North America; however,...
2013-11 (iso8601)
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The Greenland NEEM (North Greenland Eemian
Ice Drilling) operation in 2010 provided the first opportunity
to combine trace-gas measurements by laser spectroscopic
instruments and continuous-flow analysis along a
freshly drilled ice core in a...
2013 (iso8601)
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A stratigraphy-based chronology for the North
Greenland Eemian Ice Drilling (NEEM) ice core has been
derived by transferring the annual layer counted Greenland
Ice Core Chronology 2005 (GICC05) and its model extension
(GICC05modelext) from the...
2013 (iso8601)
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The Chukchi Sea is thought to be a globally important sink
of atmospheric CO₂ due to the summertime drawdown of
surface pCO₂ by phytoplankton and subsequent shelf-to-basin
transport of CO₂-enriched subsurface waters into the upper
halocline of the...
2013-11-28 (iso8601)
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The diurnal cycle of marine stratocumulus in cloud-topped boundary layers is examined using ship-based meteorological data obtained during the 2008 Variability of American Monsoon Systems (VAMOS)
Ocean–Cloud–Atmosphere–Land Study Regional...
2013-12 (iso8601)
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We document the age and extent of late Quaternary
glaciofluvial processes in Garwood
Valley, McMurdo Dry Valleys, Antarctica,
using mapping, stratigraphy, geochronology,
and geochemical analysis of sedimentary and
ice deposits. Geomorphic and...
2013-09 (iso8601)
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The recovery of a 1.5 million yr long ice core from
Antarctica represents a keystone of our understanding of
Quaternary climate, the progression of glaciation over this
time period and the role of greenhouse gas cycles in this progression.
Here we...
2013 (iso8601)
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Stream temperature will be subject to changes because of atmospheric warming in the future. We investigated the effects of the
diurnal timing of air temperature changes – daytime warming versus nighttime warming – on stream temperature. Using the...
2013-07-30 (iso8601)
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Here we investigate sedimentary records from four
small inland lakes located in the southern Cascadia forearc
region for evidence of earthquakes. Three of these lakes are
in the Klamath Mountains near the Oregon–California border,
and one is in...
2013-10-09 (iso8601)
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Adaptive comanagement (ACM) is a novel approach to environmental governance that combines the dynamic
learning features of adaptive management with the linking and network features of collaborative management. There is growing
interest in the...
2013 (iso8601)
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The origin of the late pre-industrial Holocene (LPIH) increase in atmospheric methane concentrations has been much debated. Hypotheses invoking changes in solely anthropogenic sources or solely natural sources have been proposed to explain the...
2013-11-22 (iso8601)
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Quantifying the mass transport through marine sediments, and the geochemical response to such flow with numerical models has become a common and powerful approach for geochemical data interpretation. In this dissertation, I developed and applied...
2014-03-17 (iso8601)
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The three studies that comprise this dissertation seek to answer significant
questions in paleoclimatology through unconventional applications of ice core
greenhouse gas data. These studies involve different gases and span the interval of time...
2014-03-05 (iso8601)
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Observations of Earth’s magnetic field extending back to 3.45 billion years ago indicate that generation
by a core dynamo must be sustained over most of Earth’s history. However, recent estimates of thermal and
electrical conductivity of liquid...
2013-11-26 (iso8601)
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Internal variability in twenty-first-century summer Arctic sea ice loss and its relationship to the large-scale
atmospheric circulation is investigated in a 39-member Community Climate System Model, version 3 (CCSM3)
ensemble for the period...
2014-01-15 (iso8601)
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This paper presents a particle method designed for
high-dimensional state estimation. Instead of weighing random
forecasts by their distance to given observations, the
method samples an ensemble of particles around an optimal
solution based on the...
2013-11-28 (iso8601)
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