Results 191 to 200 of about 14,642 (226)

Geostrophic boundary current separation from a coast

Journal of Geophysical Research: Oceans, 1987
The idea that backflow along the coast is necessary to produce the by now well documented meandering of a baroclinic two‐layer boundary current in geostrophic balance (Margules current) is explored. A very simple model assuming conservation of potential vorticity in a geostrophic flow yields separation only for a range of low densimetric Froude numbers,
openaire   +1 more source

Baroclinic Instability of Frontal Geostrophic Currents over a Slope

Journal of Physical Oceanography, 2005
Abstract The Phillips problem of baroclinic instability is generalized in a frontal geostrophic model. The configuration used here is a two-layer flow (with quasigeostrophic upper-layer current) over a sloping bottom. Baroclinic instability in the frontal model has a single unstable mode, corresponding to isobaths and isopycnals sloping ...
Pavec, Marc, Carton, Xavier J., Swaters, Gordon   +2 more
openaire   +2 more sources

Geostrophic currents in the south-eastern Indian Ocean

Australian Journal of Marine and Freshwater Research, 1965
Dynamic topographies and geostrophic currents in the upper 1750 m are presented for several cruises between 1960 and 1963. The mean zonal surface circulation is shown to consist of the south equatorial current, 9-14º S., and a weak easterly current between 14º and 32º C.
openaire   +1 more source

On the ignition of geostrophically rotating turbidity currents

Sedimentology, 1999
Two models of a geostrophically rotating turbidity current are examined to compare predictions for ignition with the catastrophic state. Both models describe the current as a tube of sediment‐laden water traversing along and down a uniform slope. The first (four‐equation) model neglects the energy required to lift the sediment from the seabed into ...
openaire   +1 more source

How faithfully will the geostrophic currents represent the existing ocean currents?

Journal of the Oceanographical Society of Japan, 1972
It is widely recognized that the geostrophic flows computed by the dynamic method of Bjerknes and collaborators represent the actual currents pretty faithfully. However, what would be the reason that a geostrophic current derived by only retaining the terms of Coriolis and the pressure gradient forces in the hydrodynamical equations agrees so closely ...
openaire   +1 more source

Mesoscale Geostrophic Currents and Optimal SSH Mapping

2017
Ocean Surface Current Analyses-Realtime currents (OSCAR, podaac.jpl.nasa.gov) are global ocean surface velocities calculated from sea surface height (SSH) gradients, ocean vector winds, and sea surface temperature fields using geostrophy, Ekman, and thermal wind dynamics.
openaire   +1 more source

Mixing by low‐ and high‐resolution surface geostrophic currents

Journal of Geophysical Research: Oceans, 2010
The nature of mixing near the ocean's surface is investigated by considering passive tracer advection by currents derived geostrophically using sea surface height fields that differ in their spatiotemporal resolution. One is a low‐resolution field that can be thought of as being derived using current‐generation groundtrack altimetric measurements.
openaire   +1 more source

Trapped internal gravity waves in a geostrophic boundary current

Journal of Fluid Mechanics, 1993
The effect of a geostrophic boundary current on internal gravity waves is studied with a reduced-gravity model. We found that the boundary current not only modifies the coastal Kelvin wave, but also forms wave guides for short internal gravity waves. The combined effects of current shear, the boundary, and the slope of the interface create the trapping
openaire   +2 more sources

Geostrophic currents derived from oceanic density over the Hikurangi Trench

New Zealand Journal of Geology and Geophysics, 1964
Abstract Temperature and salinity measurements obtained at nine stations off the east coast of the North Island of New Zealand are presented. The relative currents determined from these stations, which were over the Hikurangi Trench, indicate the presence of localised easterly (or south-easterly) surface-water movements, with speeds up to ahout 50 cm ...
Cha Erb Sdubbundhit, A. E. Gilmour
openaire   +1 more source

A comparison between geostrophic and current meter observations in a California current eddy

Deep Sea Research Part A. Oceanographic Research Papers, 1982
Abstract An eddy was observed about 200 km west of the central California coast using geostrophic estimates and a combined Eulerian-Lagrangian method. The eddy was about 80 km in diameter, with a depth-dependent rotational period of between 15 and 32 days. Spin rates were 6 to 20 cm−1 at 150 m and 1 to 8 cm s−1 at 1500 m.
openaire   +1 more source