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Topography induced flow variations between Taitung-Lutao off Southeast TaiwanShen, Hsuan-Chih 02 April 2012 (has links)
In order to understand the influence of topography and geometry to the flow and hydrological environments at Southeast coast of Taiwan, this study analyze data collected by tow-ADCPs in multiple cruises. The results are verified by Argos drifters.
Field operations of tow-ADCP were carried out on April and September 2009 in the vicinity of Fugang harbor, Taitung. Drifters data were download from the web for the domain 15¢XN-25¢XN, 110¢XE-125¢XE during January 1st 1986 to July 31st 2010, with a total of 706 drift trajectories.
The results show that: (1) There is a strong northward current near the coast of Taitung with maximum speed of 180 cm/s. The averaged flow velocity is 56 cm/s. The core of the current is centered at 10 km offshore in 200 m water depth. (2) The flow velocity decreases with depth. The average velocity is 97 cm/s in the upper 200 m, 42 cm/s in the middle layer 200m~400 m, and drop to 30 cm/s below 400 m. (3) The flow near the coast is deflected by the bottom topography, with upper layer flow to the northeast along the coastal line. The lower layer flows turn to west and southwest directions. (4) The transport estimated 3.3~7.2 Sv between Taiwan and LuDao (green island). (5) The flows are deflected by the ridge between LuDao and Cheng-Gong. The turns of flow can be explain by the conservation of vorticities, estimated 0.8*10-4s-1~1.2*10-4s-1. (6) The tidal current of is about a half of a knot, shoreward during flood with push Kuroshio northward. The tidal current is offshore during ebb. (7) The drifters data suggest there are eddies in this region. The surface current has seasonality, 80 cm/s in Spring , 100 cm/s in summer, 90 cm/s in fall, and 70 cm/s in winter.
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The peculiar behavior of baroclinic waves during the midwinter suppression of the Pacific storm track /Yin, Jeffrey Hiapo. January 2002 (has links)
Thesis (Ph. D.)--University of Washington, 2002. / Vita. Includes bibliographical references (leaves 115-118).
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Dynamical subgrid-scale parameterizations for quasigeostrophic flows using direct numerical simulations /Zidikheri, Meelis Juma. January 2007 (has links)
Thesis (Ph.D.) -- Australian National University, 2007.
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Study of compressible turbulent flows in supersonic environment by large-eddy simulationGenin, Franklin Marie January 2009 (has links)
Thesis (M. S.)--Aerospace Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Menon, Suresh; Committee Member: Ruffin, Stephen; Committee Member: Sankar, Lakshmi; Committee Member: Seitzman, Jerry; Committee Member: Stoesser, Thorsten
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Sea surface height variability and the structure of eddies in the South Atlantic Cape Basin /Baker-Yeboah, Sheekela. January 2008 (has links)
Thesis (Ph.D.)--University of Rhode Island, 2008. / Includes bibliographical references (leaves 297-308).
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Eddy structure and the west and east Australian currentsAndrews, John C. January 1976 (has links)
Thesis (Ph. D.)--Flinders University of South Australia, 1976. / Includes bibliographical references (leaves 156-163).
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Eddy forcing of the mean circulation in the western north AtlanticBrown, Ellen Dunning. January 1900 (has links)
Thesis (Ph. D.)--Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1984. / Includes bibliographical references (p. 175-181).
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Vertical structure of mesoscale ocean currents in the Indian Ocean observation, numerical modeling and theory /Chen, Shuiming January 2003 (has links)
Thesis (Ph. D.)--University of Hawaii at Manoa, 2003. / Includes bibliographical references (leaves 206-209).
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Observations and analysis of the Iceland Faeroes FrontAllen, John Taylor January 1996 (has links)
No description available.
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Surface eddy mixing in the global subtropicsBusecke, Julius JM January 2017 (has links)
The salinity of the ocean is inherently linked to the global hydrological cycle by net evaporation. The surface salinity, however does not just act like a 'rain gauge', ocean dynamics are vital in shaping the sea surface salinity (SSS) distribution. Here I investigate the effect of unsteady motions on scales of several hundred km and smaller - mesoscale eddies - on the water masses in the saltiest regions of the surface oceans. These water masses are eventually subducted equatorward and contribute to the shallow overturning circulation by transporting surface signals from the subtropics to the tropics, making them important components of the variable climate system. Towed CTD measurements in March/April 2013 (a component of the NASA SPURS process study) within the North Atlantic SSS maximum (SSS-max) reveal several relatively fresh and warm anomalies, which deviate strongly from climatological conditions. These features introduce a large amount of freshwater into the subtropical region, exceeding the amount introduced by local rain events. The scales and evolution of the features strongly suggest a connection to mesoscale dynamics. This is supported by high-resolution regional model output, which produces an abundance of features that are similar in scale and structure to those observed, confirming the importance of eddy mixing for the near surface salinity budget of the North Atlantic SSS-max. Observations from the Aquarius satellite and the Argo array in the global SSS-max revealed marked differences in the mean shape and variability of the SSS-maxima. These results motivated an investigation of the role of eddy mixing in setting the regional characteristics of SSS maxima. Observed surface velocities from altimetry are used to stir salinity fields in high-resolution idealized model experiments. Using a water mass framework (salinity coordinates) temporal variability in eddy mixing can be quantified, using diagnostics for the total diffusive flux into the SSS-maxima (transformation rate; TFR) as well as the estimated cross-contour diffusivity(effective diffusivity,$K_{eff}$). Both diagnostics reveal distinct variability in the different ocean basins. In the North Atlantic, both $TFR$ and $K_{eff}$ are dominated by changes in the velocity field while the North Pacific shows high sensitivity of the temporal variability in eddy mixing with respect to the initial conditions used, which represent seasonal/interannual change of the SSS-max shape and position. This implies that temporal variability of eddy mixing and diffusivities must be taken into account when constructing salinity budgets in these regions. Furthermore, the translation of results from one SSS-max region to the other might not be possible, particularly when considering a changing climate, which might influence the mechanisms responsible for temporal variability differently. Lastly evidence is presented for large scale diffusivity variability (particularly in the Pacific), connected to large scale climate fluctuations (ENSO). The evidence presented here suggests a significant modulation of surface diffusivities by climate variability, which represents a feedback mechanism not commonly recognized nor included in modern climate simulations.
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