Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 43 for “"Thermohaline Circulation"”.
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Box models of thermohaline circulation
… environments that are motivated by the thermohaline circulation of the ocean. Simple models are presented which reduce the dynamics to a few leading order processes and we present an intuitive investigation with simple experiments or numerical calculations. We study the fluid dynamics of …
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Thermohaline circulation stability : a box model
… versions of an inter-hemispheric 3-box model of Thermohaline Circulation (THC) is presented. The model consists of a northern high latitudes box, a tropical box, and a southern high latitudes box, which respectively can be thought as corresponding to the northern, tropical and southern Atlantic …
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Global thermohaline circulation and ocean-atmosphere coupling
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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A numerical model for the thermohaline circulation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1985.
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Impacts of double-diffusive processes on the thermohaline circulation
… parameterized, and their impacts on the oceanic thermohaline circulation are investigated by single-hemisphere numerical models and scaling analysis. Scaling analysis on the thermohaline circulation has been done under three types of surface boundary conditions. (a) Under "relaxation" conditions, …
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Impacts of double-diffusive processes on the thermohaline circulation
… parameterized, and their impacts on the oceanic thermohaline circulation are investigated by single-hemisphere numerical models and scaling analysis. Scaling analysis on the thermohaline circulation has been done under three types of surface boundary conditions. (a) Under "relaxation" conditions, …
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A 2 1/2 dimensional thermohaline circulation model with boundary mixing
A simple quasi-two dimensional dynamical model of Thermohaline circulation (THC) is developed, assuming that the mixing only occurs near western and eastern boundary layers. When the surface density is prescribed, the climatically important quantities, such as the strength of overturning and …
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Thermohaline circulation stability in a copuled land-ocean-atmosphere box model
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1998.
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A 2 1/2 dimensional thermohaline circulation model with boundary mixing
A simple quasi-two dimensional dynamical model of Thermohaline circulation (THC) is developed, assuming that the mixing only occurs near western and eastern boundary layers. When the surface density is prescribed, the climatically important quantities, such as the strength of overturning and …
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The role of North Atlantic Deep Water formation in the thermohaline circulation
An ocean general circulation model is used to explore the global ocean thermohaline circulation. North Atlantic Deep Water formation is an important component of this system and the role of this process in the ventilation, structure and variability of all the world ocean basins is studied. The …
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The Reversibility/irreversibility of the Thermohaline Circulation After Its Shutdown: Simulations From a Hierarchy of Climate Models
The thermohaline circulation (THC) in the North Atlantic plays a vital role in explaining past abrupt climate changes and in maintaining the current climate. Its remarkable nonlinear dynamics, first demonstrated by Stommel, has been supported by different types of models. This has led to concern …
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A coupled atmosphere-ocean model of thermohaline circulation, including wind-driven gyre circulation with an analytical solution
A parameter representing circulation due to wind forcing is added to the thermohaline circulation model of Marotzke (1996). The model consists of four boxes and is governed by a system of two differential equations governing the temperature and salinity differences between high latitude ocean and …
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Feedback mechanism in the oceanic carbon cycle
… characterized by two distinct patterns of the thermohaline circulation. The temperature driven, high latitudes sinking mode showed significantly lower atmospheric pCO2 than the salinity-driven, low latitudes sinking mode. The atmosphere-ocean dynamics dominates the system behavior of the model. …
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Sensitivity of a general circulation inverse model to sub-grid scale parametrization coefficients
Ocean modellers seek to understand the circulation of the oceans, or portions thereof, by developing models of the ocean they can solve. This tractability constraint forces ocean modellers to make choices. Naturally, they hope to make intelligent choices, but whenever a new model is being developed …
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Cold air outbreaks over the Gulf Stream and implications for the North Atlantic Ocean
… regions where oceanic deep convection drives the thermohaline circulation. This study uses an observational data analysis and model experiments with CESM’s Parallel Ocean Processor to examine CAO intensive winters alongside contrasting years of winter warm events to quantify impacts on the North …
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Self sustained thermohaline oscillations and their implications for biogeochemical cycles
An ocean general circulation model (OGCM) configured with a paleo ocean bathymetry such as late Permian shows that different modes of ocean circulation might exist in warm climate: a strong 'thermal mode' induced by cooling at high latitudes and a weak 'haline mode' induced by evaporation at …
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Variations in the particulate flux of ²³⁰Th and ²³¹Pa and paleoceanograhpic applications of the ²³¹Pa/²³¹Th ratio
… and a horizontal flux to boundaries due to ocean circulation. A quantification of the influence on the fractionation of the two nuclides by advection resulting from the thermohaline circulation was made, and it is shown that almost half of the 231 Pa production in the water column is exported from …
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A new hypothesis for the 1470-year cycle of abrupt warming events in the last ice-age
… abrupt switches between two modes of the thermohaline ocean circulation. It is shown that the millennial-scale response of the climate model to the century-scale forcing is a plausible consequence of the high degree of non-linearity and the large characteristic time scale of the …
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Time-lapse Acoustic Imaging of Oceanic Fronts and Eddies
… this way, two- and three-dimensional images of thermohaline circulation can be generated. Critically, these images have equal vertical and horizontal resolutions of \textit{O}(10)~m. Here, I describe, process, and analyse a calibrated two-dimensional seismic survey from the Bellingshausen Sea of …
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