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Dissertations / Theses on the topic 'Convection (Oceanography)'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 July 2024

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1

Pierce, David W. "Rotating convection and the oceanic general circulation /." Thesis, Connect to this title online; UW restricted, 1993. http://hdl.handle.net/1773/10993.

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2

Bhushan, Vikas. "Modeling convection in the Greenland Sea." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/58537.

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Thesis (S.M.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 1998.<br>Includes bibliographical references (leaves 155-161).<br>A detailed examination of the development of a deep convection event observed in the Greenland Sea in 1988-89 is carried out through a combination of modeling, scale estimates, and data analysis. We develop a prognostic one-dimensional mixed layer model which is coupled to a thermodynamic ice model. Our model contains a representation of

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3

Steffen, Elizabeth Laird. "Observations of vertical and horizontal aspects of deep convection in the Labrador Sea by fully Lagrangian floats /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/11028.

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4

Wells, Mathew Graeme. "Convection, turbulent mixing and salt fingers." View thesis entry in Australian Digital Theses Program, 2001. http://thesis.anu.edu.au/public/adt-ANU20011212.103012/index.html.

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5

Wilkinson, Jeremy. "Sea ice, convection and the Greenland Sea." Thesis, University of Southampton, 2005. https://eprints.soton.ac.uk/25132/.

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The region where deep open-ocean convection occurs in the Greenland Sea corresponds to that where a sea ice winter feature, the Odden, usually forms. The role of sea ice in modifying the surface waters to overturn to depth is evaluated through the combination of in siu measurements, satellite imagery, meteorological measurements and drifting buoy data. Results suggest local meteorological and oceanographic conditions govern the ice conditions over the region. The high ambient wave energy precludes the formation of ice beyond the frazil-pancake stage; the changing surface pressure field, due to

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6

Pruis, Matthew J. "Energy and volume flux into the deep ocean : examining diffuse hydrothermal systems /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/10990.

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7

Grignon, Laure. "Causes of the interannual variability of deep convection." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/72147/.

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Deep water formation in the Labrador Sea and the Gulf of Lion, for example, results from convection. A cyclonic circulation leads to a doming of the isopycnals at its centre, where stratification is then completely eroded by high surface winter buoyancy loss. This thesis assesses the causes of the interannual variability of deep convection. We first aim to quantify the relative importance of preconditioning, defined as the temperature and salinity structures and contents of the water column before the onset of convection, and of the buoyancy forcing (averaged over one winter) on the final conv

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8

Mpeta, Emmanuel Jonathan. "Intra-seasonal convection dynamics over Southwest and Northeast Tanzania : an observational study." Master's thesis, University of Cape Town, 1997. http://hdl.handle.net/11427/19650.

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Intraseasonal convection oscillation over the northeastern and southwestern Tanzania during MAM and DJF seasons respectively are examined using December, 1979 to May, 1994 pentad (5-day mean) Outgoing Longwave Radiation (OLR) as an indicator of convective cloud distribution. Area-averaged OLR indices are derived for the two areas. Time series of OLR indices for MAM and DJF indicate large quasi-periodic OLR fluctuations in some years and small fluctuations in other years. Periodogram analyses results reveal that dominant periodogram values for the oscillations were different in different years

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9

Cuny, Jerome. "Labrador Sea boundary currents /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/10959.

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10

Straneo, Fiammetta. "Dynamics of rotating convection including a horizontal stratification and wind /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/10996.

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11

de, Lavaissiere de Lavergne Casimir. "Cessation of southern ocean deep convection under anthropogenic climate change." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=119766.

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In 1974, newly available satellite observations unveiled the presence of a giant ice-free area within the Antarctic ice pack, which persisted throughout the winter, and formed again in the next two winters. Subsequent research showed that deep convective overturning kept the waters ice-free, through the massive release of heat rising from the deep sea. While the polynya has aroused continued interest among climate scientists, it has not reappeared since 1976. Here we use model experiments to show that deep convection in the Southern Ocean, common in current generation climate models, is highly

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12

Våge, Kjetil. "Circulation and convection in the Irminger Sea." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/58395.

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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), 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 131-149).<br>Aspects of the circulation and convection in the Irminger Sea are investigated using a variety of in-situ, satellite, and atmospheric reanalysis products. Westerly Greenland tip jet events are intense, small-scale wind phenomena located east of Cape Farewell, and are important to circulation and conv

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13

Von, Eye Maxine Jutta Erika. "Sea ice and convection in the Greenland Sea." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648527.

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14

Roberts, Zoe Louise. "The application of adaptive mesh modelling techniques to the study of open ocean deep convection." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/65672/.

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The rapid cooling of the waters at high latitudes creates an unstable strati cation which in turn leads to localised overturning (sinking) of the water column. This process is called open ocean deep convection (OODC). The process of OODC occurs in stages. Initially, individual convective elements known as plumes form and cold, dense water descends from the surface. Over time these plumes build up to produce a well-mixed `chimney' of cold dense uid. This chimney then slumps and sinks, and restratication (the return to a stable state throughout the water column) occurs. It is widely accepted tha

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15

Lavender, Kara L. "The general circulation and open-ocean deep convection in the Labrador Sea : a study using subsurface floats /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2001. http://wwwlib.umi.com/cr/ucsd/fullcit?p3035893.

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16

Martin, Jeffrey T. "The influence of silica precipitation and thermoelastic stresses on the evolution of a ridge crest seafloor hydrothermal system." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/28026.

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17

Zhang, Fan. "Changing seasonality of convective events in the Labrador Sea." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51896.

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The representation of deep convection in ocean models is a fundamental challenge for climate science. Here a regional simulation of the Labrador Sea circulation and convective activity obtained with the Regional Oceanic Modeling System (ROMS) over the period 1980-2009 is used to characterize the response of convection to atmospheric forcing and the variability in its seasonal cycle. This integration compares well with the sparse in time and space hydrographic surveys and ARGO data (Luo et al. 2012). It is found that convection in the convective region of the Labrador Sea has experienced variab

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18

Cordery, Matthew Jean. "Mantle convection, melt migration and the generation of basalts at mid-ocean ridges." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/52936.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, and Woods Hole Oceanographic Institute, 1991.<br>Includes bibliographical references (leaves 183-190).<br>by Matthew Jean Cordery.<br>Ph.D.

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19

Walker, Carolyn Faye, and n/a. "Nutrient dynamics during winter convection in the North Atlantic Subtropical Gyre." University of Otago. Department of Chemistry, 2009. http://adt.otago.ac.nz./public/adt-NZDU20090825.142702.

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Storm-induced open-ocean convective mixing is one of the primary processes controlling the supply of nitrate to the sunlit layer of the oligotrophic North Atlantic Subtropical Gyre (NASG). Yet, the magnitude and timing of nitrate fluxes during winter convection is poorly understood due to an absence of targeted process studies. In the northwest NASG, multiple quasi-Lagrangian studies were conducted during the boreal winters of 2004 and 2005 in an effort to sample strong winter convection. During each of the time-series studies, inventories of vertically fluxed nitrate were quantified approxima

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20

Parnell-Turner, Ross Ernest. "Observations of transient mantle convection in the North Atlantic Ocean." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648620.

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21

Kaspi, Yohai. "Turbulent convection in the anelastic rotating sphere : a model for the circulation on the giant planets." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45780.

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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), 2008.<br>Includes bibliographical references (p. 207-221).<br>This thesis studies the dynamics of a rotating compressible gas sphere, driven by internal convection, as a model for the dynamics on the giant planets. We develop a new general circulation model for the Jovian atmosphere, based on the MITgcm dynamical core augmenting the nonhydrostatic model. The grid extends deep into the planet's interio

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22

Hufford, Gwyneth Ellin. "Parameterization of convection in a rotating stratified ocean : comparison of numerical and laboratory experiments with theory." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/59632.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, and Woods Hole Oceanographic Institution, 1995.<br>Includes bibliographical references (leaves 70-73).<br>by Gwyneth Ellin Hufford.<br>M.S.

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23

Houssais, Marie-Noëlle. "Modelisation des interactions ocean-glace : application a la mer du groenland." Paris 6, 1987. http://www.theses.fr/1987PA066173.

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Les processus dynamiques et thermodynamiques du couplage glace-ocean sont etudies a l'aide d'une hierarchie de modeles numeriques. Un modele thermodynamique de glace de mer ou le flux de chaleur oceanique est impose revele l'influence de ce flux sur le cycle saisonnier d'epaisseur de la glace. L'influence de la derive de la glace sur les bilans locaux de fonte-congelation est examinee a l'aide d'un modele dynamique-thermodynamique de glace de mer

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24

Lherminier, Pascale. "Convection profonde en Mer du Groenland: Etude expérimentale des phases de préconditionnement et de mélange." Phd thesis, Université Pierre et Marie Curie - Paris VI, 1998. http://tel.archives-ouvertes.fr/tel-00881646.

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La convection profonde en Mer du Groenland, source importante des eaux profondes de l'Atlantique Nord, fait actuellement l'objet de recherches approfondies. Nous présentons ici les principaux résultats obtenus au cours des hivers de 1993 et 1994 à partir de mesures de flotteurs isobares dérivant entre 250 et 850 m de profondeur et d'un vaste ensemble de données hydrologiques, météorologiques et glaciologiques. L'hiver 1994, peu rigoureux, ne donne lieu qu'à une convection semi-profonde dans un bassin libre de glace, où un tourbillon anticyclonique d'environ 40 km de diamètre apparaît comme un

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25

Liu, Lei. "The link between convection and crystallization in a sub-axial magma chamber and heat output in a seafloor hydrothermal system." Thesis, Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-07072007-142506/.

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26

Farrar, J. Thomas (John Thomas) 1976. "Air-sea interaction at contrasting sites in the Eastern Tropical Pacific : mesoscale variability and atmospheric convection at 10°N." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/39009.

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Thesis (Ph. D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2007.<br>Includes bibliographical references (p. 153-166).<br>The role of ocean dynamics in driving air-sea interaction is examined at two contrasting sites on 125°W in the eastern tropical Pacific Ocean using data from the Pan American Climate Study (PACS) field program. Analysis based on the PACS data set and satellite observations of sea surface temperature (SST) reveal

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27

Wood, Dylan M. "Solving Unsteady Convection-Diffusion Problems in One and More Dimensions with Local Discontinuous Galerkin Methods and Implicit-Explicit Runge-Kutta Time Stepping." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461181441.

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28

Lewis, Kayla Christine. "Numerical Modeling of Two-Phase Flow in the Sodium Chloride-Water System with Applications to Seafloor Hydrothermal Systems." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19810.

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In order to explain the observed time-dependent salinity variations in seafloor hydrothermal vent fluids, quasi-numerical and fully numerical fluid flow models of the NaCl-H2O system are constructed. For the quasi-numerical model, a simplified treatment of phase separation of seawater near an igneous dike is employed to obtain rough estimates of the thickness and duration of the two-phase zone, the amount of brine formed, and its distribution in the subsurface. For the fully numerical model, the equations governing fluid flow, the thermodynamic relations between various quantities employed, an

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29

MacTavish, Flora Pamela. "The application of adaptive mesh techniques to convective processes in oceanography." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11616.

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Idealised numerical simulations of two oceanographic processes, salt finger formation and the restratification phase of open ocean deep convection, are considered. These processes are modelled using the Imperial College Ocean Model (Fluidity-ICOM). This is a finite element code with the novel capability to perform mesh adaptivity. The mesh is triangular/tetrahedral and can be unstructured. If mesh adaptivity is used, all the fields are periodically interpolated onto a new mesh that has been optimised from the previous mesh. The new mesh is designed to represent one or more of the solution fiel

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30

Blamey, Ross. "Mesoscale convective complexes over southern Africa." Doctoral thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/10167.

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Includes bibliographical references.<br>A combination of numerous factors, including geographic position, regional orography and local sea surface temperatures, ensures that subtropical southern Africa experiences considerable spatial and temporal variability in rainfall and is prone to both frequent flooding and drought events.

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31

Beuvier, Jonathan. "Modélisation de la variabilité climatique de la circulation et des masses d'eau en Méditerranée : impacts des échanges océan-atmosphère." Phd thesis, Palaiseau, Ecole polytechnique, 2011. https://pastel.hal.science/docs/00/67/68/96/PDF/Beuvier_2011_PhD-thesis_1.pdf.

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Cette thèse a pour but de progresser sur des points essentiels concernant le réalisme de la représentation de la formation et du trajet des masses d'eau en Mer Méditerranée, ainsi que de leur variabilité. A cet effet, plusieurs modèles océaniques régionaux de la Méditerranée, de résolutions horizontales différentes, sont développés et utilisés. Une configuration réaliste permettant de représenter la variabilité interannuelle des conditions aux limites de ces modèles (atmosphère, océan Atlantique, fleuves, mer Noire) est utilisée pour réaliser des simulations à long terme des 50 dernières année

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32

Athanase, Marylou. "On the recent evolution of Atlantic Water at the entrance to the Arctic Ocean : observations and Mercator Ocean operational model." Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS263.

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L’analyse combinée d’observations et de sorties du modèle opérationnel Mercator Océan (appelé PSY4) a apporté un nouvel éclairage sur les récentes conditions océaniques du Bassin Eurasien Arctique occidental. Les mesures physiques collectées par deux plateformes autonomes dans le Bassin Eurasien occidental (0-350 m) ont indiqué que la couche de surface observée en 2017 était moins salée, et la couche chaude des eaux Atlantiques était moins profonde qu’en 2007-2012 (climatologie WOA13). PSY4 a apporté des informations complémentaires sur la nature des structures de méso-échelle documentées in-s

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33

Beuvier, Jonathan. "Modélisation de la variabilité climatique de la circulation et des masses d'eau en Méditerranée : impacts des échanges océan-atmosphère." Phd thesis, Ecole Polytechnique X, 2011. http://pastel.archives-ouvertes.fr/pastel-00676896.

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Cette thèse a pour but de progresser sur des points essentiels concernant le réalisme de la représentation de la formation et du trajet des masses d'eau en Mer Méditerranée, ainsi que de leur variabilité. A cet effet, plusieurs modèles océaniques régionaux de la Méditerranée, de résolutions horizontales différentes, sont développés et utilisés. Une configuration réaliste permettant de représenter la variabilité interannuelle des conditions aux limites de ces modèles (atmosphère, océan Atlantique, fleuves, mer Noire) est utilisée pour réaliser des simulations à long terme des 50 dernières année

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34

Blamey, Ross. "Numerical simulation of a mesoscale convective system over the east coast of South Africa." Master's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/6463.

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Includes bibliographical references (leaves 189-200).<br>Weather stations across the northern KwaZulu-Natal coastline recorded over 100 mm of rainfall over the 11112 February 2005, with Cape St. Lucia and Richards Bay measuring 111 mm and 96.8 mm, respectively. This heavy rainfall was associated with a mesoscale convective system (MCS) that initiated through small convective storms beginning early in the afternoon on 11 February 2005 and eventually decayed in the early morning hours on the 12th. The high-lying topography of the eastern escarpment and high diurnal surface heating possibly provi

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35

Jeffery, Christopher D. "Diurnal warming and convective CO2 exchange in the Tropical Atlantic." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/63292/.

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36

Andrié, Chantal. "Utilisation des traceurs helium-3 et tritium en oceanographie." Paris 6, 1987. http://www.theses.fr/1987PA066241.

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Le traceur transitoire que constitue le tritium est devenu l'un des outils les plus prometteurs dens l'etude de la circulation oceanique generale et de la capacite de l'ocean a absorber le gaz carbonique anthropogene. L'utilisation simultanee du tritium et de son descendant par voie radioactive l'helium-3 ajoute une information supplementaire: la paire de traceurs tritium et helium-3 constitue une horloge dans l'etude des masses d'eau. En plus de son origine "tritiumgenique", l'helium-3 est emis au niveau des dorsales oceaniques et il constitue un traceur de choix dans l'etude de la circulatio

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37

Hogancamp, Kyle J. "Characterizing South American Mesoscale Convective Complexes Using Isotope Hydrology." TopSCHOLAR®, 2017. http://digitalcommons.wku.edu/theses/1937.

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Mesoscale convective complexes (MCCs) over subtropical South America contribute an average annual volume of precipitation equal to approximately seven km3 and occur with an average regularity in the region, with more than 30 per warm season. Isotopic characteristics of precipitation, such as δ2H and δ18O values, provide information that can be used to identify unique processes and sources related to precipitation events. The largest database of isotope characteristics of precipitation within the region is the Global Network of Isotopes in Precipitation (GNIP), which provides varying temporal r

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38

Robinson, Elizabeth M. "The effect of a shallow low viscosity zone on mantle convection and its expression at the surface of the earth." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/58496.

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Thesis (Ph. D.)--Joint Program in Marine Geology and Geophysics (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 1987.<br>Includes bibliographical references (v.2, leaves 309-317).<br>Many features of the oceanic plates cannot be explained by conductive cooling with age. A number of these anomalies require additional convective thermal sources at depths below the plate: mid-plate swells, the evolution of fracture zones, the mean depth and heat flow relationships with age and the observation of small scal

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39

Shearman, R. Kipp. "Dynamics of mesoscale motion in the California current." Thesis, 1999. http://hdl.handle.net/1957/27789.

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40

Li, Guoqing. "Simulating interdecadal variation of the thermohaline circulation by assimilating time-dependent surface data into an ocean climate model /." 1994. http://collections.mun.ca/u?/theses,75354.

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41

Mullarney, Julia C. "Thermal and thermohaline convection models for the meridional overturning circulation of the oceans." Phd thesis, 2004. http://hdl.handle.net/1885/146265.

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42

Tesdal, Jan-Erik. "Circulation changes associated with freshwater and heat content variability and implications for biological productivity in the subpolar North Atlantic Ocean." Thesis, 2020. https://doi.org/10.7916/d8-36h5-xz52.

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Large-scale circulation in the northern North Atlantic plays a crucial role in the global climate by influencing ocean storage of atmospheric heat and carbon. Temperature and salinity changes in this region can have important consequences on ocean circulation due to density stratification at sites of deep water formation. Such influences can involve feedback mechanisms related to the Atlantic Meridional Overturning Circulation, which has been shown to influence the hydrography of the northern North Atlantic on decadal timescales. Current expectations are that through increasing sea-ice melting

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43

Marsland, SJ. "Coupled ocean/sea-ice modelling in the Southern Ocean." Thesis, 1999. https://eprints.utas.edu.au/20449/1/whole_MarslandSimonJames1999_thesis.pdf.

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The ocean/sea-ice interaction in the Southern Ocean is investigated using the Hamburg Ocean Primitive Equation Model (HOPE). The ocean model is three dimensional and prognostically calculates velocity, temperature, salinity and sea-surface elevation on a multi-level staggered Arakawa E-grid. Coupled to this is a thermodynamic model of sea-ice growth and melt, and a dynamic model with viscous-plastic rheology. Two versions have been formulated: a high-resolution re-entrant channel model of the East Antarctic coastline; and a medium-resolution southern hemisphere model. In the high-resol

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44

(8066834), David J. Cannon. "Hypolimnetic Mixing in Lake Michigan." Thesis, 2019.

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<p>Little work has been done to estimate turbulence characteristics in the hypolimnetic waters of large lakes, where the magnitude and vertical structure of turbulent parameters have important implications for nutrient cycling and benthic exchange. In this thesis, hypolimnetic mixing is investigated over the annual stratification cycle in a large lake using a series of experiments in Lake Michigan that utilize acoustic Doppler velocimeters, thermistors, and microstructure profilers to characterize mean flow and turbulence throughout the water column. More than 500 days of physical limnologica

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45

Gamble, Rosevear MM. "Fine-scale ocean processes driving the basal melting of Antarctic ice shelves." Thesis, 2021. https://eprints.utas.edu.au/37966/1/Gamble_Rosevear_whole_thesis.pdf.

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The Antarctic Ice Sheet, which comprises the largest volume of ice on our planet, is losing mass due to ocean-driven melting of its fringing ice shelves. Efforts to represent basal melting in sea level projections are undermined by poor understanding of the turbulent ice shelf-ocean boundary layer (ISOBL), a meters-thick band of ocean that regulates heat, salt and momentum transfer between the far field ocean and the ice. Regional ocean models cannot resolve the ISOBL and instead rely on parameterisations to predict melting. However, observations suggest that these parameterisations only perfo

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