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Eastern Boundary Ventilation and the Structure of the Thermocline
Eastern Boundary Ventilation Thermocline
2009/2/6
The effect of relaxing the zero geostrophic zonal flow condition at the eastern boundary on the structure of the ventilated thermocline is described. It is argued that the effect of dissipation can al...
Ventilation, Potential-Vorticity Homogenization and the Structure of the Ocean Circulation
Potential-Vorticity Homogenization Ocean Circulation Ventilation
2009/2/6
A model for the vertical structure of the oceanic circulation is presented that combines elements of the theory of the ventilated thermocline, given by Luyten, Pedlosky and Stommel, with the theory of...
Cross-Gyre Ventilation of the Subtropical Gyre：An Internal Mode in the Ventilated Thermocline
Cross-Gyre Ventilation Ventilated Thermocline Subtropical Gyre
2009/1/20
A model of cross-gyre geostrophic flow is presented. It is a two-layer model of the (Northern Hemisphere) subtropical thermocline above a resting lower ocean. The northern boundary of the gyre is take...
Ventilation of the Subtropical North Pacific：The Shallow Salinity Minimum
Subtropical North Pacific Shallow Salinity Minimum
2009/1/15
The shallow salinity minimum of the subtropical North Pacific is shown to be a feature of the ventilated, wind-driven circulation. Subduction of low salinity surface water in the northeastern subtropi...
The Ventilation of the World’s Oceans：Maps of the Potential vorticity Field
World’s Oceans Potential vorticity Field
2009/1/15
Maps of potential vorticity (q) within four different density layers are presented for the North and South Atlantic, North and South Pacific, and Indian Oceans. Potential vorticity is evaluated as (f/...
3H and 3He in the Beta Triangle：Observations of Gyre Ventilation and Oxygen Utilization Rates
Gyre Ventilation Oxygen Utilization Rates
2009/1/7
Isopycnal maps of 3H–3He age (τ) with about 100 km resolution have been obtained for a 1000-km scale area in the eastern subtropical North Atlantic. The midscale texture of the maps is consistent with...
Fluid Dynamics of Oceanic Thermocline Ventilation
Fluid Dynamics Oceanic Thermocline Ventilation Potential vorticity
2008/12/22
A flux form of the Potential vorticity (PV) equation is applied to study the creation and transport of potential vorticity in an ocean gyre; generalized PV fluxes (J vectors) and the associated PV flu...
The ventilation of the subtropical North Pacific is studied using a simple analytical model. The model is forced by winter mixed layer density and depth calculated from the Levitus climatology and win...
Diagnosing Climate Change and Ocean Ventilation Using Hydrographic Data
Sub-Antarctic mode water Ocean Ventilation Diagnosing Climate Change
2008/12/16
Changes in atmospheric forcing can affect the subsurface water column of the ocean by three different mechanisms. First, warmed mixed-layer water that is subducted into the ocean interior will cause s...
Ventilation of the Deep Western Boundary Current and Abyssal Western North Atlantic: Estimates from Tritium and 3He Distributions
North Atlantic Deep Water deep western boundary current
2008/12/15
The tritium and excess 3He data from the 1981 TTO/NAS program are used to study the time scales for the ventilation of the deep western basin by recently formed North Atlantic Deep Water (NADW). The l...
The Age of Water and Ventilation Timescales in a Global Ocean Model
Ventilation Timescales Global Ocean Model North Atlantic Deep Water
2008/12/12
The age of water in the World Ocean is studied using a passive age tracer introduced into a global ocean model. Additional information is derived from a transient “dye” tracer that tracks the time-dep...
Ventilation of the North Atlantic and North Pacific：Subduction Versus Obduction
North Atlantic North Pacific Subduction Versus Obduction
2008/12/12
Ventilation in the North Atlantic and North Pacific is examined by analyzing the Levitus climatological data and the Hellerman and Rosenstein wind stress data. Ventilation between the permanent pycnoc...
Oceanic Ventilation in the Eastern North Atlantic
Oceanic Ventilation Eastern North Atlantic subpolar mode water
2008/12/10
Ventilation of the eastern North Atlantic by subpolar mode water is illustrated by recent hydrographic section and analyzed using a large-scale stationary thermocline model including a surface mixed l...
The Role of North Atlantic Deep Water Formation in an OGCM’s Ventilation and Thermohaline Circulation
North Atlantic Deep Water Formation Ventilation Thermohaline Circulation
2008/10/27
Two coarse-resolution model experiments are carried out on an OGCM to examine the effects of North Atlantic Deep Water (NADW) formation on the thermohaline circulation (THC) and ventilation timescales...
Numerical Study of Eastern Boundary Ventilation and Its Effects on the Thermocline Structure
Numerical Study Eastern Boundary Ventilation Thermocline Structure
2008/7/30
Numerical experiments with idealized OGCM are carried out to investigate the oceanic eastern boundary problems. The experimental results indicate that the eastward flow due to the north–south gradient...