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Monday, October 5, 2020 | History

2 edition of thermocline and current structure in subtropical/subpolar basins found in the catalog.

thermocline and current structure in subtropical/subpolar basins

Rui Xing Huang

thermocline and current structure in subtropical/subpolar basins

by Rui Xing Huang

  • 246 Want to read
  • 20 Currently reading

Published by Woods Hole Oceanographic Institution in Woods Hole, Mass .
Written in English

    Subjects:
  • Thermoclines (Oceanography),
  • Ocean currents.

  • Edition Notes

    Statementby Rui Xin Huang.
    SeriesWHOI / Woods Hole Oceanographic Institution -- 84-42., WHOI (Series) -- 84-42., Doctoral dissertation (Woods Hole Oceanographic Institution)
    The Physical Object
    Paginationviii, 217 p. :
    Number of Pages217
    ID Numbers
    Open LibraryOL16115605M

    illustrates the meridional temperature structure in the North Atlantic subtropical gyre. The warm lens of the ventilated thermocline penetrates to depths of more than m. Similar gyre features exist in all the ocean basins. Carbon in the Subtropical Thermocline [6] The . A.L. Gordon, in Encyclopedia of Ocean Sciences (Second Edition), Weddell Gyre. The Weddell Gyre is the largest of the cyclonic Gyres occupying the region between the Antarctic Circumpolar Current and Antarctica, stretching from the Antarctic Peninsula to 30°E. The clockwise flow pattern is linked to doming of isopycnals and upwelling of deep water within its central axis (Figure 3).

      The western boundary current of the subtropical gyre of the South Pacific is the East Australia Current (EAC). A peculiarity of the South Pacific's subtropical gyre is that the EAC separates and flows eastward through the Tasman Sea over to New Zealand where it forms another small southward western boundary current called the East Auckland Current. The upper layer in the eastern basins contains a variety of Subpolar Mode Waters (SPMW) carried between fronts associated with the NAC branches (Brambilla & Talley, ).The Rockall Trough contains SPMW from a major southern NAC branch and also Eastern North Atlantic Water from the Biscay intergyre regions (Figure 1 a); this basin contains the highest influence of subtropical water of .

    upper density structure further, there are often gyre contrasts in the depth of the same s surface over the and reveal a sharp subtropical–subpolar contrast (Fig. 4b); for NAO1, the thermocline is anomalously deep in shallow in the subtropics and deep in the subpolar gyre. Changes in the subtropical thermocline are related to changes. Ocean current, stream made up of horizontal and vertical components of the circulation system of ocean waters that is produced by gravity, wind friction, and water density variation in different parts of the ocean. Ocean currents are similar to winds in the atmosphere in that they transfer significant amounts of heat from Earth’s equatorial areas to the poles and thus play important roles in.


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Thermocline and current structure in subtropical/subpolar basins by Rui Xing Huang Download PDF EPUB FB2

A Two-layer Model for the Thermocline and Current Structure in Subtropical/Subpolar Basins I. Lower Layer with Infinite Depth Abstract A study is made of the thermocline and current structures of a subpolar gyre and a double gyre basin.

A simple two-layer model is used, and its behavior is explored as the amount of water in the upper layer is. Part two of this thesis concerns the use of a continuously stratified model to represent the thermocline and current structures in subtropical/subpolar basins.

The ideal fluid thermocline equation. The thermocline and current structure in subtropical. The thermocline and current structure in subtropical/subpolar basins. By Rui Xin Huang. Get PDF (9 MB) Abstract.

by Rui Xin (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, Bibliography: leaves Author: Rui Xin Huang. A double thermocline is a generic stratification feature in each of the subtropical ocean basins.

For example, in the North Atlantic thermocline and current structure in subtropical/subpolar basins book, the strongest density variations are found in both an upper thermocline centered at around – m and a lower thermocline centered at around – m; these two thermoclines are separated by a region of weakly stratified “mode water.”Cited by:   Climate variability in the subtropical gyre interior induced by anomalous surface thermal forcing, Ekman pumping, mixed layer depth variability, and anomalous subpolar water formation is examined, using a continuously stratified model of the ideal-fluid thermocline.

Ocean gyres collect floating pollutants (and other flotsam). The Great Pacific garbage patch in the central North Pacific Ocean is a gyre of marine debris particles and floating trash halfway between Hawaii and California.

It covers an indeterminate large zone depending on plastic concentration chosen to define it. It is estima metric tons of plastic, totaling trillion pieces.

The depth anomalies of the σ = surface are taken to be representative of changes in the depth of the thermocline and reveal a sharp subtropical–subpolar contrast ; for NAO+, the thermocline is anomalously deep in the subtropics and shallow in the subpolar gyre, while for the NAO− period, the thermocline is anomalously shallow in the.

Close mobile search navigation. Article navigation. Vol Issue 6. The midlatitude thermocline also responds directly to weakened Ekman pumping, shoaling (deepening) in the subtropical (subpolar) ocean, primarily as an n = 1 mode (Figs.

5 and 9). This signal propagates to the western boundary of the basin via Rossby waves and is carried equatorward via coastal Kelvin and short-wavelength Rossby waves.

Lecture Equatorial thermocline 4/25/ AM 1. Introduction We have discussed dynamics of western boundary layers in the subtropical and subpolar basin.

In particular, inertial boundary layer plays an important role in the western boundary region. Now we move towards the equator, where a most unique situation is the vanishing of the. lem of understanding the structure of the thermocline of an idealized ocean consisting of a single, isolated basin with a single subtropical and subpolar gyre is not fully understood.

The particular geography of the ocean basins and the circulation between them will surely play an important role in modifying the structure revealed by such a. layer (dashed line). In (a), the circulations are associated with a thin thermocline in the tropics and a thicker thermocline in the subtropical gyre, and a thin or seasonal thermocline over the subpolar gyre.

In (b), an eastward wind-driven current in the Southern Ocean is associated with cold water outcropping on the poleward side of the current. cluding the detailed structure of the South Pacific sub-tropical gyre.

In section 4, we will summarize the results from this study. The diagnostic calculation Our diagnostic calculations are based on the Stommel () demon hypothesis wherein water masses sub-ducted into the permanent pycnocline have late winter properties.

It is a distinct water mass from the classical subtropical mode water (STMW) of the western Pacific. Eastern STMW is formed as a relatively deep late-winter mixed layer, associated with the subtropical/subpolar water mass boundary near 25°–30°N, °–°W, and is capped and subducted into the permanent thermocline.

An example of this difference between in situ and potential temperature is shown in Table and in Figure using data collected in by the R/V T. Washington from the Mariana Trench (the deepest trench in the world ocean). While temperature (T) reaches a minimum at about m and thereafter increases toward the bottom, potential temperature is almost uniform.(Salinity also is almost.

R.G. Williams, in Encyclopedia of Ocean Sciences (Second Edition), Formation of the Main Thermocline. Throughout the ocean there is a persistent thermocline separating the mixed layer and the weakly stratified deep ocean.

In ideal thermocline theory, the subduction process forms an upper thermocline over the subtropical gyre. mode water and hence thinning of the upper thermocline in the central-to-eastern subtropics.

Almost all of this thinning signal, however, recirculates within the subtropics, and does not extend to the equator. Another midlatitude response is shallowing (deepening) of the thermocline in the subtropical (subpolar) ocean in response to Ekman pumping. In the subtropical gyres, Ekman pumping and lateral flow through the sloping winter mixed layer base, close to the subtropical‐subpolar boundary, lead to the subduction of relatively warm surface waters and maintains the ventilated thermocline [Iselin, ; Stommel, ; Marshall et al., ].

Fig. The temperature, in oC, on the main thermocline of the Pacific and Atlantic Oceans. Vertical temperature gradient on the main thermocline also varies greatly over the world oceans. Within the subtropical gyres, the gradient is on the order of oC/m; however, it is much larger in the equatorial ocean, varies from 10oC/m in the western part to 20oC/m in.

The large-scale impacts of sub-mesoscale physics are addressed by comparing mean characteristics of basin-scale, seasonally varying, subtropical and subpolar gyres in a suite of numerical experiments varying in horizontal resolution (1°, 1/9° and 1/54°) and accordingly, in sub-grid scale mixing.

North Pacific Eastern Subtropical Mode Water (NPESTMW) originates northeast of Hawaii near the boundary of the subtropical and subpolar water masses (Hautala and Roemmich, ). Additionally, Subantarctic Mode Water is also known to contribute to EEP thermocline water (Toggweiler et al., ).The thermocline and current structure in subtropical/subpolar basins.

Ph.D. Thesis, Massachusetts Institute of Technology/Woods Hole Oceanographic Institution, pp. Lecture Notes.