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Wednesday, May 20, 2020 | History

2 edition of Impacts of double-diffusive processes on the thermohaline circulation found in the catalog.

Impacts of double-diffusive processes on the thermohaline circulation

Jubao Zhang

Impacts of double-diffusive processes on the thermohaline circulation

by Jubao Zhang

  • 320 Want to read
  • 8 Currently reading

Published by Massachusetts Institute of Technology, Woods Hole Oceanographic Institution, Joint Program in Oceanography/Applied Ocean Science and Engineering in Woods Hole, Mass .
Written in English

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

  • Edition Notes

    Statementby Jubao Zhang.
    SeriesMIT/WHOI -- 98-17., MIT/WHOI (Series) -- 98-17.
    ContributionsMassachusetts Institute of Technology., Woods Hole Oceanographic Institution.
    The Physical Object
    Pagination157 p. :
    Number of Pages157
    ID Numbers
    Open LibraryOL15537030M

    Thermohaline circulation (THC) is a part of the large-scale ocean circulation that is driven by global density gradients created by surface heat and freshwater fluxes. The adjective thermohaline derives from thermo-referring to temperature and -haline referring to salt content, factors which together determine the density of sea water. Wind-driven surface currents (such as the Gulf Stream. A series of large-scale numerical simulations is presented, which incorporate parameterizations of vertical mixing of temperature and salinity by double-diffusion and by small-scale turbulence. These simulations reveal the tendency of double-diffusion to constrain diapycnal volume transport, both upward and downward. For comparable values of mixing coefficients, the average diapycnal velocity Author: Timour Radko, Erick Edwards.

    Thermopile Circulation [3] Ocean circulation is commonly divided into TV parts: the thermopile and the wind driven circulation. In other words, circulation in the oceans is partly due to wind stress, and also partly due to changes in density because of changes in temperature and salinity. Oceanographers have an array of sophisticated tools to measure ocean currents, but from time to time, fortuitous accidents can also aid our understanding of ocean circulation. A great example is the case of the container ship Ever Laurel, which was on its way from Hong Kong to Tacoma, Washington, in January , when 12 containers were washed.

      Impacts of double-diffusive processes on the thermohaline circulation  Zhang, Jubao (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, ) Double-diffusive processes are studied and parameterized, and their impacts on the oceanic thermohaline circulation are investigated by single-hemisphere numerical.   Shutdown of circulation pattern could be disastrous, researchers say If global warming shuts down the thermohaline circulation in the North Atlantic Ocean, the .


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Impacts of double-diffusive processes on the thermohaline circulation by Jubao Zhang Download PDF EPUB FB2

Double-diffusive processes are studied and parameterized, and their impacts on the oceanic thermohaline circulation are investigated by single-hemisphere numerical mod-els and scaling analysis. Scaling analysis on the thermohaline circulation has been done under three types of.

Impacts of double-diffusive processes on the thermohaline circulation / Article   September   with  3 Reads  How we measure 'reads' A 'read' is counted each time someone views a publication Author: Jubao.

Zhang. Thesis (Ph. D.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept.

of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), Cited by: 2. Impacts of double-diffusive processes on the thermohaline circulation. By Jubao Zhang. Download PDF (7 MB) Abstract. by Jubao (Ph. D.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept.

of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), Includes Author: Jubao Zhang.

The apparent importance of the double-diffusive processes to the thermohaline circulation, and its sensitivity to the variables in the diffusivity parameterization, suggests that a much better knowledge of such mixing processes in the real ocean is by: Impacts of double-diffusive processes on the thermohaline circulation.

By Jubao Zhang. Get PDF (7 MB) Abstract. by Jubao (Ph. D.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept.

of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), Includes. For instance, staircase-resolving modeling is the most obvious tool that can be used to assess the impact of staircases on regional dynamics and on the global thermohaline circulation.

Modeling can also help to generate essential insights into the problem of the spatial orientation of high-gradient interfaces—the processes controlling the slopes of interfaces relative to the slopes of isotherms and isohalines. Models also suggest that double diffusion lowers the net interior density diffusivity sufficiently to make the thermohaline circulation more susceptible to collapse.

Double-diffusive convection is a mixing process driven by the interaction of two fluid components which diffuse at different rates.

Leading expert Timour Radko presents the first systematic overview of the classical theory of double-diffusive convection in a coherent narrative, bringing together the disparate literature in this developing by: Abstract.

One of the distinguishing features of mixing in the ocean is that it is quite commonly unstable to double-diffusive instabilities. These arise because of the two orders of magnitude difference between the thermal conductivity of water and the diffusivity of dissolved salts, and the tendency of gradients of temperature and salinity to oppose one another in their effects on by:   The thermohaline circulation (THC) is a global three-dimensional belt of ocean currents that transports large amounts of heat and freshwater (Manabe and Stouffer ).In the North Atlantic, it is manifested in a meridional overturning circulation (MOC), which, through its northward transport of warm tropical waters by the Gulf Stream and North Atlantic Current, effectively contributes to the Cited by: Thermohaline Circulation The surface currents we have discussed so far are ultimately driven by the wind, and since they only involve surface water they only affect about 10% of the ocean’s volume.

However, there are other significant ocean currents that are independent of the wind, and involve water movements in the other 90% of the ocean.

In a process known as thermohaline circulation, cold salty water sinks at high latitudes, pulling in warmer water from lower latitudes in to replace it.

The cold deep high salinity water then flows from the North Atlantic to the Southern Atlantic and from there east to the Indian and Pacific Oceans, where it returns to the surface through a. Thermohaline circulation, also called Global Ocean Conveyor or Great Ocean Conveyor Belt, the component of general oceanic circulation controlled by horizontal differences in temperature and salinity.

It continually replaces seawater at depth with water from the surface and slowly replaces surface water elsewhere with water rising from deeper depths. Chapter 6 THERMOHALINE CIRCULATION 1 Phenomenology and Processes As discussed in Chap. 1, the global distribution of surface heat and water fluxes creates large-scale, upper-ocean pressure gradients and sparsely distributed sites of deep convection (mainly in Labrador, Greenland, Weddell, andRossSeas)thatcombinetodrivetheglobal-scalethermohaline.

I teach thermohaline circulation, upwelling, downwelling, and surface currents, but I don't focus on the simplified conveyor model typically found in textbooks, because I think it is too simple.

Since Wally's book came out, there has been further discussion on its simplicity and usability. The sinking that drives the thermohaline circulation depends critically on the water being sufficiently cold and salty. Therefore, any factor that changes the state of the conditions for circulation, can result in a slow-down of the thermohaline circulation, and thereby dramatically influence the climatic state and driving further climate change.

Double diffusive convection is often studied for its own sake, i.e. as a curiousity of fluid dynamics, applied to specific conditions. It has long been debated whether the small scale double diffusion process can have significant impacts on the large scale properties or dynamics of the marine system.

By affecting vertical temperature and salinity profiles, double‐diffusive mixing can lead to changes in surface heat fluxes and sea ice thermodynamics, possibly impacting on water mass formation and ocean by: double diffusion.

These results indicate a greater sensitivity of the thermohaline circulation to double diffusion than had previously been suspected due to the tendency of the double-diffusive mixing to generate self-reinforcing flows. This effect appears to be more significant when the double-diffusive mixing is applied only when the.

Several processes contribute differently and concurrently to this circulation, referred to as the “thermohaline” circulation, due to its dependence on changes in temperature (“thermo”) and salinity (“haline”), both of which Ocean circulation has profound impacts on the mean state and variability of the climate system.

EquatorialFile Size: KB.The cold, salty waters that drive the thermohaline circulation form in the Arctic Ocean, the North Atlantic, and the Southern Ocean. The shallow ocean floor along the Bering Straight prevents deep currents from flowing out of the Arctic Ocean into the Pacific.

Dense water on the floor of the North Atlantic moves southward, eventually joining the sinking waters of Southern Ocean in the far South Atlantic.Double diffusive fluxes of heat and salt, which differ by two orders of magnitude, have a significant impact on the thermohaline circulation and oceanic heat transport.

Small-scale double-diffusive structures can be coupled with large-scale circulation by strong vertical (T–S) gradients and current shears created by large-scale lateral by: