Index Catalog // ScholarsArchive@OSU

Creator:: Duncan, Robert A.
Abstract:: Radiometric ages (K-Ar and ⁴⁰Ar- ³⁹Ar methods) have been determined on dredged volcanic rocks from seven of the New England Seamounts, a prominent northwest-southeast trending volcanic lineament in the northwestern Atlantic Ocean. The ⁴⁰Ar-³⁹Ar total fusion and incremental heating ages show an increase in seamount construction age from southeast to...
Resource Type:: Article
Full Text:: the New England Seamounts, a prominent northwest-southeast trend- ing volcanic lineament in the

Creator:: Magill, James, Cox, Allan, and Duncan, Robert A.
Abstract:: Paleomagnetic directions from the Eocene Tillamook Volcanic Series of the Oregon Coast Range point 460 clockwise from the expected Eocene field direction. Potassium argon dating of six dikes and flows from this formation yields a mean age of 44.3 ± 0.6 m.y. These results establish that the Oregon coastal block...
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Full Text:: to northwest occur in the western part of the area (Figure 3) near Pinochle Peak and Cedar Butte

Creator:: Duncan, Robert A.
Abstract:: K-Ar and ⁴⁰Ar-³⁹Ar geochronologic data reveal the Paleocene to Eocene eruptive history of volcanic centers which produced the basaltic basement rocks of the Coast Range of Oregon and Washington. Volcanism was short lived at each center and migrated with time from the northern and southern ends toward the center, near...
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Full Text:: Plain and the Yellowstone area. 1. The Coast Range, Oregon and Washington Recently much interest

Creator:: Watts, A. B., Weissel, J. K., Duncan, Robert A., and Larson, R. L.
Abstract:: We have combined shipboard and Seasat altimeter derived data in an intergrated geological and geophysical study of the Louisville Ridge; a 3500-km-long seamount chain extending from the Tonga trench to the Eltanin Fracture Zone. A break in the smooth trend of the ridge at latitude 37.5°S has been recognized in...
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Full Text:: quarter of a revolu- tion of Seasat. Thus over the study area in which 800-km-long profiles of altimeter

Creator:: Zaneveld, J. Ronald, Kitchen, James C., and Pak, Hasong
Abstract:: A simple heat budget model for a radiation-dominated mixed layer of constant depth is presented. In this model the influence of the vertical irradiance (heat flux) profile is examined by means of the Jerlov [1976] optical water type classification. It is shown that the vertical irradiance profile is important in...
Resource Type:: Article
Full Text:: the upper face of an infinitesimally small element of a surface, divided by the area of that element

Creator:: Strub, P. Ted and Powell, Thomas M.
Abstract:: A numerical model has been used to investigate the wind-driven circulation in a stratified basin of moderate size, Lake Tahoe, California-Nevada. Two types of circulation are identified: "direct" circulations, in which the current directions remain relatively constant and the mean circulation formed over several days resembles the instantaneous circulation, and...
Resource Type:: Article
Full Text:: following strong northwest winds and found a similar result: strong winds initially forced a two-gyre

Creator:: Kosro, P. Michael, 1951- and Huyer, Adriana, 1945-
Abstract:: Two mesoscale surveys were conducted (in July 1981 and July 1982) near Point Arena, California, to determine the structure and circulation associated with tongues of cold surface water extending seaward from the coastal zone. Both surveys were designed at sea on the basis of available satellite IR data, and each...
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Full Text:: , 1976. Mittelstaedt, E., The upwelling area off northwest Africa--A descrip- tion of phenomena

Creator:: Huyer, Adriana, 1945- and Kosro, P. Michael, 1951-
Abstract:: Repeated mesoscale surveys of a 40-km-wide, 100-km-long, coastal region near Point Arena, California, were conducted during the upwelling season (April-August) in 1981 and 1982. Each survey included conventional conductivity-temperature-depth casts at standard locations over the continental shelf and slope between 38°N and 39°10'N, and continuous operation of a Doppler acoustic...
Resource Type:: Article
Full Text:: Point Arena and a predominantly northwest- southeast orientation between Point Arena and Point Reyes

Creator:: Thomas, A. C. and Strub, P. Ted
Abstract:: A 5-year time series of coastal zone color scanner imagery (1980-1983, 1986) is used to examine changes in the large-scale pattern of chlorophyll pigment concentration coincident with the spring transition in winds and currents along the west coast of North America. The data show strong interannual variability in the timing...
Resource Type:: Article
Full Text:: (January) surface concentrations from the south- ern portion of the study area (• 34øN) decrease from

Creator:: Twohy, Cynthia, Clarke, A. D., Warren, S. G., Radke, L. F., and Charlson, R. J.
Abstract:: Using the counterflow virtual impactor, a new instrument for sampling cloud droplets, measurable levels of light-absorbing material were found to exist inside droplets in stratocumulus clouds off the coast of southern California. Eighty percent of the samples of droplet residue material had light absorption coefficients ranging from 6 to 20...
Resource Type:: Article
Full Text:: encoun- tered at the 925-mbar level had been located to the west, northwest, or north on the days

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