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Helium isotope variations in Juan de Fuca ridge basalts

Creator:: Lupton, John E., Graham, David W., Delaney, John R., and Johnson, H. Paul
Abstract:: We have measured ³He/⁴He ratios and He and Ne concentrations on a suite of 24 basalt glasses from the neovolcanic zone of the Juan de Fuca Ridge (JdFR) from 44.6°N near the Blanco Transform up to 48.0°N on the Endeavour Segment. The helium isotope ratios exhibit a clear geographic variation,...
Resource Type:: Article
Full Text:: Laboratory, Hatfield Marine Science Center, Newport, OR 97365. David W. Graham, College of Oceanic and

Crystal structure of the northwestern Vizcaino block and Gorda Escarpment, offshore northern California, and implications for postsubduction deformation of a paleoaccretionary margin

Creator:: Leitner, Beate, Tréhu, Anne Martine, and Godfrey, Nicola
Abstract:: The Vizcaino block is an anomalously shallow region of the western U.S continental margin located southwest of the Mendocino triple junction. It originated as part of the accretionary prism of the North America plate and was transferred to the Pacific plate in the Miocene as the Pacific-North America plate boundary...
Resource Type:: Article
Full Text:: paleoaccretionary margin JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 103, NO. B10, PAGES 23,795-23,812, OCTOBER 10, 1998

Crystal structure beneath the central Oregon convergent margin from potential-field modeling: Evidence for a buried basement ridge in local contact with a seaward dipping backstop

Creator:: Fleming, Sean W. and Tréhu, Anne Martine
Abstract:: Models of magnetic and gravity anomalies along two E-W transects offshore central Oregon, one of which is coincident with a detailed velocity model, provide quantitative limits on the structure of the subducting oceanic crust and the crystalline backstop. The models indicate that the backstop-forming western edge of the Siletz terrane,...
Resource Type:: Article
Full Text:: seaward dipping backstop JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 104, NO. B9, PAGES 20,431-20,447

Numerical experiments on the effects of a meridional ridge on the transmission of energy by barotropic Rossby waves

Creator:: Matano, Ricardo P.
Abstract:: Analytical and numerical models are used to study the effects of a meridional ridge on the propagation of barotropic Rossby waves produced by distant wind stress forcing. The analytical model illustrates the qualitative aspects of the problem by solving a simplified form of the potential vorticity equation. The analytical results...
Resource Type:: Article
Full Text:: Numerical experiments on the effects of a meridional ridge on

Foraminiferal faunal estimates of paleotemperature: Circumventing the no-analog problem yields cool ice age tropics

Creator:: Mix, Alan C., Morey, Ann E., Pisias, Nicklas G., and Hostetler, Steven W.
Abstract:: The sensitivity of the tropics to climate change, particularly the amplitude of glacial‐to‐interglacial changes in sea surface temperature (SST), is one of the great controversies in paleoclimatology. Here we reassess faunal estimates of ice age SSTs, focusing on the problem of no‐analog planktonic foraminiferal assemblages in the equatorial oceans that...
Resource Type:: Article
Full Text:: problem yields cool ice age tropics Alan C. Mix, Ann E. Morey, and Nicklas G. Pisias College of

δ¹³C record of Upper North Atlantic Deep Water during the past 2.6 million years

Creator:: Oppo, D. W., Raymo, M. E., Lohmann, G. P., Mix, Alan C., Wright, J. D., and Prell, W. L.
Abstract:: Benthic foraminiferal δ¹³C data from site 502 in the Caribbean Sea (sill depth 1800 m) indicate that throughout the past 2.6 m.y., glacial δ¹³C values in the middepth Atlantic were higher during glaciations than interglaciations. This is interpreted as indicating a greater proportion of Upper North Atlantic Deep Water (UNADW)...
Resource Type:: Article
Full Text:: Sawyer Environmental Research Center, University of Maine, Orono. 5Department of Geological Science

Comparison of Imbrie-Kipp transfer function and modern analog temperature estimates using sediment trap and core top foraminiferal faunas

Creator:: Ortiz, Joseph D. and Mix, Alan C.
Abstract:: We evaluate the reliability of statistical estimates of sea surface temperature (SST) derived from planktonic foraminiferal faunas using the modern analog method and the Imbrie‐Kipp method. Global core top faunas provide a calibration data set, while modern sediment trap faunas are used for validation. Linear regression of core top predicted...
Resource Type:: Article
Full Text:: . Ortiz1 and A. C. Mix College of Oceanic and Atmospheric Sciences, Oregon State Univenity, Corvallis

Upper-tropospheric relative humidity observation and implications for cirrus ice nucleation

Creator:: Heymsfield, Andrew J., Miloshevich, Larry M., Twohy, Cynthia, Sachse, Glen, and Oltmans, Samuel
Abstract:: Relative humidity (RH) measurements acquired in orographic wave cloud and cirrus environments are used to investigate the temperature‐dependent RH required to nucleate ice crystals in the upper troposphere, RHnuc(T). High ice‐supersaturations in clear air—conducive to the maintenance of aircraft contrails yet below RHnuc and therefore insufficient for cirrus formation—are not...
Resource Type:: Article
Full Text:: continental measurements on other research days, and the chemical composition of the IN was higher in

The role of heterogeneous freezing nucleation in upper troposphereic clouds : inferences from SUCCESS

Creator:: DeMott, Paul J., Rogers, David C., Kreidenweis, Sonia M., Chen, Yalei, Twohy, Cynthia, Heymsfield, Andrew J., Chan, K. Roland, and Baumgardner, Darrel
Abstract:: A temperature spectrum if heterogeneous freezing nuclei concentrations in continental air in the upper troposphere was determined based on airborne measurements. Numerical model simulations incorporating ice formation by heterogeneous and homogeneous freezing of deliquesced soluble aerosol particles were performed to investigate the effect of the heterogeneous freezing nuclei were predicted...
Resource Type:: Article
Full Text:: Research Center, Moffett Field, CA Abstract. A temperature spectrum of hete. rogeneous freezing nuclei

Chlorophyll enchancement and mixing associated with meanders of the shelf break front in the Mid-Atlantic Bight

Creator:: Ryan, J. P., Yoder, J. A., Barth, John A., and Cornillon, P. C.
Abstract:: Meanders of the shelf break front in the Mid-Atlantic Bight (MAB) during April and May of 1997 were associated with chlorophyll enhancement along a hydrographic and a topographic feature. The hydrographic feature was the surface outcrop of the front, which ranged from ~10 to >100 km seaward of the shelf...
Resource Type:: Article
Full Text:: the shelf break front in the Mid‐Atlantic Bight JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 104, NO

ScholarsArchive@OSU

Helium isotope variations in Juan de Fuca ridge basalts

Crystal structure of the northwestern Vizcaino block and Gorda Escarpment, offshore northern California, and implications for postsubduction deformation of a paleoaccretionary margin

Crystal structure beneath the central Oregon convergent margin from potential-field modeling: Evidence for a buried basement ridge in local contact with a seaward dipping backstop

Numerical experiments on the effects of a meridional ridge on the transmission of energy by barotropic Rossby waves

Foraminiferal faunal estimates of paleotemperature: Circumventing the no-analog problem yields cool ice age tropics

δ¹³C record of Upper North Atlantic Deep Water during the past 2.6 million years

Comparison of Imbrie-Kipp transfer function and modern analog temperature estimates using sediment trap and core top foraminiferal faunas

Upper-tropospheric relative humidity observation and implications for cirrus ice nucleation

The role of heterogeneous freezing nucleation in upper troposphereic clouds : inferences from SUCCESS

Chlorophyll enchancement and mixing associated with meanders of the shelf break front in the Mid-Atlantic Bight

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