399 research outputs found
Characteristic patterns of shelf circulation at the boundary between central and southern California
Vertical motion of the thermocline, nitracline and chlorophyll maximum layers in relation to currents on the Southern California Shelf
A continuous four-day time series of nitrate concentration, temperature, chlorophyll fluorescence, and currents, sampled at fixed depths, revealed that distributions of temperature and nitrate could be accounted for by vertical motions in the water column associated with the semidiurnal internal tide and internal waves. A probable mixing event was observed: the transport of nitrate into the surface-layer associated with shear instabilities generated by internal waves. On temporal scales of less than a few hours, the variation of chlorophyll fluorescence could also be explained by vertical advection. However, on longer scales, swimming behavior of the phytoplankton assemblage (dominated by Ceratium spp.), along with vertical motions in the water column, appears to account for the vertical distribution of chlorophyll. These results indicate that the nitracline maintains a stable relationship with the density structure of the water column on a scale of days, whereas the subsurface chlorophyll maximum can change significantly over several hours
Imaging of epilepsy following electrical injury
Electrical injury may result in brain injury with delayed symptoms and sequelae. We report a case of high-voltage cerebral electrical injury in a 42-year-old man through his right hand with delayed symptoms and with imaging abnormalities suggesting that haemorrhage had occurred on the cortical somatosensory areas of his left cerebral hemisphere. An appropriate patientâs clinical history should be obtained to correlate the lesions to the event as delay between the event and the symptoms can be very long
Operation of a 1-Liter-Volume Gaseous Argon Scintillation Counter
We have built a gas-phase argon ionization detector to measure small nuclear
recoil energies (< 10 keVee). In this paper, we describe the detector response
to X-ray and gamma calibration sources, including analysis of pulse shapes,
software triggers, optimization of gas content, and energy- and
position-dependence of the signal. We compare our experimental results against
simulation using a 5.9-keV X-ray source, as well as higher-energy gamma sources
up to 1332 keV. We conclude with a description of the detector, DAQ, and
software settings optimized for a measurement of the low-energy nuclear
quenching factor in gaseous argon. This work was performed under the auspices
of the U.S. Department of Energy by Lawrence Livermore National Laboratory in
part under Contract W-7405-Eng-48 and in part under Contract DE-AC52-07NA27344.
Funded by Lab-wide LDRD. LLNL-JRNL-415990-DRAFT.Comment: 29 pages, single-column, double-spaced, 21 figure
Statistical aspects of surface drifter observations of circulation in the Santa Barbara Channel
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Observations and modeling of coastal internal waves driven by a diurnal sea breeze
During the Internal Waves on the Continental Margin (IWAVES) field experiments of 1996 and 1997 off of Mission Beach, California (32.75° N), we observed energetic, dirunal-band motions across the entire study site in water depths ranging from 15 to 500 m and spanning a cross-shore distance of 15 km. The spectral peak of the currents was at the diurnal frequency (ÏDâ = 1 cpd) and was sufficiently well resolved to be clearly separated from the slightly higher local inertial frequency (f = 1.08 cpd). These motions were surface enhanced and clockwise circularly polarized and had an upward phase propagation speed of ~68 m dÂŻÂč, suggesting that the motions were driven predominantly by the diurnal sea breeze. However, the downward energy (upward phase) propagation seems irreconcilable with the subinertial diurnal period, and moreover, the intermittent diurnal current events were not obviously associated with the diurnal sea breeze events. We rationalize these features using a flat-bottomed linear modal sum internal wave model that includes advection and refraction due to subtidal alongshore flow, V(x,t). Fluctuations in V at the observing site can change the âeffectiveâ local Coriolis parameter f + Vx by as much 50%, thus making the diurnal motions at different times effectively either subinertial or superinertial. The model is integrated numerically for 200 days at a latitude of 32.75°N under different wind and subtidal flow conditions: purely diurnal winds and no V, purely diurnal winds and a time-independent V, narrow-band diurnal winds and no V, and narrow-band diurnal winds and subtidal, time-dependent V. Model diurnal currents forced by narrow-band diurnal winds and subtidal V show complex offshore structure with realistic intermittency and spectral broadening. This study suggests that continental margins in the vicinity of the 30° latitude (where ÏDâ = f) are regions that could potentially produce energetic, sea breeze-driven baroclinic motions and that these motions could be regulated by the vorticity of the local subtidal currents
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Observations of the semidiurnal internal tide on the southern California slope and shelf
We give a detailed description of the semidiurnal-band current and temperature
variability observed during the Internal Waves on the Continental Margin (IWAVES) field
experiments of 1996 and 1997 off of Mission Beach, California. This variability was
dominated by the internal tide, and the structure of the internal tide on the slope and
shelfbreak region was different from that on the narrow shelf. On the slope and shelfbreak,
the internal tide was dominated by alongshore propagating coastal-trapped waves. In this
region, semidiurnal-band currents were predominantly oriented in the alongshore
direction. In the lower half of the water column at a water depth H of 350 m, current
and temperature variability were consonant with a short wavelength (~8 km) bottom
trapped wave propagating in the alongshore direction to the north. In the upper 120 m of
the water column (above the depth of the shelfbreak), slope and shelfbreak currents were
highly coherent with a zero phase lag; that is, there was no phase propagation in the cross-shore
direction. On the narrow (~10 km) shelf, cross-shore currents u were much more
energetic than on the slope and had the structure of a mode-one internal wave. The
alongshore currents v decreased monotonically from the surface to the bottom of the water
column with a phase that did not change with depth. The near-bottom u signal propagated
toward the coast during all mooring deployments, faster in the summer than in the fall.
The near-bottom u and mid-column temperature relative phase was neither consistent with
a purely progressive nor a purely standing mode-one internal wave. We conclude that
the internal tide on the shelf was partially reflected.Copyrighted by American Geophysical Union.Keywords: continental shelf and slope circulation, internal tide, coastal-trapped wave, internal wave
Estimate of the Cosmological Bispectrum from the MAXIMA-1 Cosmic Microwave Background Map
We use the measurement of the cosmic microwave background taken during the
MAXIMA-1 flight to estimate the bispectrum of cosmological perturbations. We
propose an estimator for the bispectrum that is appropriate in the flat sky
approximation, apply it to the MAXIMA-1 data and evaluate errors using
bootstrap methods. We compare the estimated value with what would be expected
if the sky signal were Gaussian and find that it is indeed consistent, with a
per degree of freedom of approximately unity. This measurement places
constraints on models of inflation.Comment: 5 pages, 2 figures. New version to match paper accepted for
publication in Phys. Rev. Lett. Non-diagonal terms included leading to new
limits on f_N
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Statistical aspects of surface drifter observations of circulation in the Santa Barbara Channel
Argos-tracked drifters are used to study the near-surface circulation in
the Santa Barbara Channel. The mean consists of a cyclonic cell in the western
Santa Barbara Channel with weaker flow in the eastern Channel. Drifter mean
velocities agree well with record means from near-surface current meters. At
the eastern entrance to the channel, drifter velocities are biased toward outflow
(eastward velocity) conditions. Drifter variability at synoptic and seasonal scales
shows a tendency for upwelling and eastward flow in spring, a strong cyclonic
circulation in summer, poleward relaxation in fall, and weak, variable circulation
in winter. Drifter estimates of eddy stress divergence indicate advective terms play
a secondary role in the mean surface momentum balance. Lagrangian time and
space scales are about 1 day and under 10 km, respectively. The mismatch between
Lagrangian and Eulerian timescales indicates advective terms are important to the
fluctuating circulation.Copyrighted by American Geophysical Union
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