High‐resolution surveys of oceanographic and atmospheric conditions made during the
winter over the inner shelf off northwest Australia are used to examine the coastal ocean
response to large outgoing heat and freshwater fluxes. Relatively cool, low‐humidity air
blows off the Australian continent out over the tropical continental shelf, resulting in...
During the Southern Ocean Iron Experiment (SOFeX), January-February 2002, two iron fertilization experiments were conducted at the south (66.45°S, 171.8°W) and north (56.23°S, 172°W) patches. The south patch was replete with all macronutrients, whereas the north patch was nearly depleted of silicate. Using a towed water sampling/measurement system, high resolution...
Ocean acidification is predicted to occur first in polar oceans. We investigated the
saturation state of waters with respect to calcite (Wcal) and aragonite (Warg) in six sections
along an Arctic outflow pathway through the Canadian Arctic Archipelago (CAA) and into
the northwestern Atlantic using dissolved inorganic carbon and total...
Remotely sensed sea surface temperature (SST) and a model originally developed for Cap Blanc, northwest Africa [Dugdale et al., 1989], are used to estimate new production (i.e., nitrate uptake, in the sense of Dugdale and Goering [1967]) for the persistent coastal upwelling feature at Point Conception, California. Parameters required to...
The Explorer region offshore western Canada is a tectonically complex area
surrounded by the Pacific, North America, and Juan de Fuca plates. Existing tectonic
models for the region differ fundamentally. Proposed plate configurations range from
multiple independent plate fragments to an Explorer plate now fused to North America
along the...
Lavas from seamounts of the central Galápagos Platform and the Carnegie Ridge increase in age with distance from the western edge of the platform, consistent with a hotspot model for the generation of these features. The areal distribution of seamount ages suggests that the pattern of dispersed volcanism seen on...
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...
Satellite altimeter measurements of marine gravity reveal 100 to 200-km
wavelength lineations over a wide area of the Pacific plate oriented roughly in the direction of
absolute plate motion. At least three mechanisms have been proposed for their origin: smallscale
convective rolls aligned in the direction of absolute plate motion...
Data from an array of bottom pressure gauges and a string of current meters in the vicinity of 47°N,
139°W, are used to examine the deep-ocean variability forced by ocean surface wind stress curl from
August 1987 to June 1988. Bottom geostrophic currents are computed from the pressure gauge array,...
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...