These data show that mixing time scales for
the upper thermocline are decadal and mixing time scales for the deep ocean are multi-centennial.
Not exact matches
Furthermore, a deeper
upper layer of warm surface water may weaken the cold tongue if the Ekman pumping doesn't reach down below the
thermocline to bring up colder water, and weakened trade winds would have a similar effect through reduced Ekman pumping near the equator.
After participation in a ship expedition with RV SONNE to the North Pacific in summer 2018, the tasks include to reconstruct the spatial and temporal changes in near - surface and subsurface water temperatures in the North Pacific, salinity,
thermocline depth, and water mass stratification of the
upper oceanic surface using geochemical proxy parameters, e.g. in planktic microfossils.
Furthermore, a deeper
upper layer of warm surface water may weaken the cold tongue if the Ekman pumping doesn't reach down below the
thermocline to bring up colder water, and weakened trade winds would have a similar effect through reduced Ekman pumping near the equator.
In colder oceans, the separating layer (
thermocline) does not form, or only for parts of the year, so phytoplankton at the top receives nutrients from the deeper sea and provides oxygen for the the
upper and deeper layers (as well as nutrients, when phytoplankton decomposes).
By the way — the
upper 700 m «shallow» ocean is referred to as shallow because it's typically the depth above the
thermocline, traditionally considered the boundary between shallow and deep regions.
This isotherm is chosen because it lies within the center of the main
thermocline and is often used as an indicator of the
upper layer flow in the western tropical Atlantic and Gulf of Mexico waters.
This flow exerts a shearing stress on the ocean surface, which results in the deflection of the
upper layer of water above the
thermocline to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
It's more or less constant or the
thermocline between the deep ocean and the
upper layer would be moving up or down.
If eddies are suppressed by a modest but nonnegligible horizontal diffusion and vertical diffusion is kept realistically small, the model
thermocline exhibits a familiar two - regime structure with an
upper, advectively dominated ventilated
thermocline and a lower, advective — diffusive internal
thermocline, and together these compose the main
thermocline.