By inverting EarthScope long-period magnetotelluric (MT) data from the southeastern United States (SEUS), we obtain electrical conductivity images that provides key insights into the geodynamics of this region. Significantly, we resolve a highly electrically resistive block that extends to mantle depths beneath the modern Piedmont and Coastal Plain physiographic provinces....
Magnetotelluric (MT) data from two sites 150 and
300 km southeast of San Francisco, California (geomagnetic
dipole latitude: 43 degrees, L approximately 1.9) show that
the usual MT assumption of spatially uniform external magnetic
fields is violated to a significant degree in the period
range 10-30 s. Inter-station transfer functions...
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consumption data. This work was partially
supported by USGS NEHRP grants 1434-HQ-97-GR-03026 (G. D.
Egbert
We describe novel hybrid algorithms for inversion of electromagnetic geophysical data, combining the computational and storage efficiency of a conjugate gradient approach with an Occam scheme for regularization and step-length control. The basic algorithm is based on the observation that iterative solution of the symmetric (Gauss-Newton) normal equations with conjugate...
Two modifications to an existing scheme of tidal
mixing are implemented in the coarse resolution ocean component
of a global climate model. First, the vertical distribution
of energy flux out of the barotropic tide is determined
using high resolution bathymetry. This shifts the levels of
mixing higher up in the...
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mixing for ocean models
A. Schmittner and G. D. Egbert
College of Earth, Ocean and Atmospheric Sciences
Two modifications to an existing scheme of tidal
mixing are implemented in the coarse resolution ocean component
of a global climate model. First, the vertical distribution
of energy flux out of the barotropic tide is determined
using high resolution bathymetry. This shifts the levels of
mixing higher up in the...
Two modifications to an existing scheme of tidal
mixing are implemented in the coarse resolution ocean component
of a global climate model. First, the vertical distribution
of energy flux out of the barotropic tide is determined
using high resolution bathymetry. This shifts the levels of
mixing higher up in the...
Serum samples were collected between 24 and 48 h of age
from 408 Hereford calves of a selection experiment and from 200
Angus, Hereford and Red Poll calves of another experimental
population (Germ Plasm Utilization project). Concentrations of
Immunoglobulin G₁ (IgG₁) were determined by single radial
immunodiffusion. Breed or selection...