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Dissertations / Theses on the topic 'Downwelling'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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1

Spurgin, Jessica Michelle. "Flow dynamics around downwelling submarine canyons." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46533.

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Flow dynamics around a downwelling submarine canyon were analyzed with the Massachusetts Institute of Technology general circulation model. Blanes Canyon (Northwest Mediterranean) was used for topographic and initial forcing conditions. Fourteen scenarios were modelled with varying forcing conditions. Rossby number and Burger number were used to determine the significance of Coriolis acceleration and stratification (respectively) and their impacts on flow dynamics. A new non-dimensional parameter (χ) was introduced to determine the significance of vertical variations in stratification. Downwel
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2

Bhandari, Purushottam. "The Design of a Polarimeter and its Use for the Study of the Variation of Downwelling Polarized Radiance Distribution with Depth in the Ocean." Scholarly Repository, 2011. http://scholarlyrepository.miami.edu/oa_dissertations/605.

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The spectral polarized radiance distribution provides the most complete description of the light field that can be measured. However, this is a very difficult parameter to measure near the surface because of its large dynamic range, dependence on incoming sky conditions, and waves at the air-sea interface. The measurement of the Stokes vector of the downwelling polarized light field requires the combination of at least four images, all of which must be obtained simultaneously. To achieve this, a new polarimeter (which we call DPOL) has been designed, characterized, calibrated and deployed. T
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3

Mehta, Payal. "The microphysical properties of Saharan dust obtainable from downwelling infrared radiances." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526395.

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4

Wang, Haixing. "Impact Of Canyon Upwelling And Downwelling In The Mid-Atlantic Bight." W&M ScholarWorks, 2021. https://scholarworks.wm.edu/etd/1627407406.

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Submarine canyons can impact regional oceanography and provide a conduit for shelf-slope exchanges via topographically induced processes such as canyon upwelling and downwelling. Between Virginia and New York in the Mid-Atlantic Bight (MAB), there are five major shelf-incising canyons (Norfolk, Washington, Baltimore, Wilmington, and Hudson canyons) and four sizable slope-confined canyons (Accomac, Spencer, Lindenkhol, and Toms canyons). Canyon upwelling and downwelling at these canyons have not been well studied. Consequently, the associated hydrographic variability and dynamics inside the can
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5

Rodríguez, Cruz Elisabet. "Circulation patterns of Ría de Pontevedra under upwelling and downwelling conditions." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/23481.

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Mestrado em Ciências do Mar e da Atmosfera<br>Circulation patterns inside some of the Rías Baixas have been widely studied, but this is not the case of the Ría de Pontevedra. Through this thesis, we try to enhance the knowledge about the circulation pattern of this Ría. A ROMS-AGRIF system con guration was used in this study. This con guration was validated through the comparison with weekly temperature and salinity data measured by INTECMAR. The analysis done in this work is based on the study of three representative events of the circulation patterns: one upwelling event and two downw
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6

Zhang, Zhenxi. "Modeling downwelling circulation over continental shelf in the northern South China Sea /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?AMCE%202009%20ZHANG.

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7

Neal, David A. "Maximum Likelihood Temperature/Emissivity Separation of Hyperspectral Images with Gaussian Distributed Downwelling Radiance." DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/5873.

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Hyperspectral images are made up of energy measurements at different wavelengths of light. The case is considered where these measurements are dependent on temperature, the self-emitted energy (emissivity), and reflected energy (downwelling radiance) from the surroundings. The process where the downwelling radiance is fixed and the temperature and emissivity are estimated is referred to as temperature/emissivity separation. Due to the way these terms mix, for a given set of measurements, there exist many pairs of temperatures and emissivities that satisfy the model. This creates ambiguity in t
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8

Viúdez, i. Mora Antoni. "Atmospheric downwelling longwave radiation at the surface during cloudless and overcast conditions. Measurements and modeling." Doctoral thesis, Universitat de Girona, 2011. http://hdl.handle.net/10803/31841.

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Atmospheric downwelling longwave radiation is an important component of the terrestrial energy budget; since it is strongly related with the greenhouse effect, it remarkably affects the climate. In this study, I evaluate the estimation of the downwelling longwave irradiance at the terrestrial surface for cloudless and overcast conditions using a one-dimensional radiative transfer model (RTM), specifically the Santa Barbara DISORT Atmospheric Radiative Transfer (SBDART). The calculations performed by using this model were compared with pyrgeometer measurements at three different European places
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9

Batifoulier, François. "Hydrodynamique du plateau continental aquitain et influence sur les épisodes à Dinophysis dans le Bassin d’Arcachon." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14441/document.

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Des épisodes à Dinophysis affectent périodiquement l'exploitation des fruits de mer dans le Bassin d'Arcachon. Le réseau de surveillance interne au Bassin d'Arcachon montre que Dinophysis est advecté de l'océan ouvert. Le but de cette étude est de déterminer l'origine de Dinophysis. Des campagnes en mer sur le plateau continental Aquitain ont permis d'identifier une zone propice au développement de Dinophysis au large de Capbreton. Les épisodes à Dinophysis dans le bassin d'Arcachon se produisent suite à des vents d'Ouest qui induisent des courants vers le Sud d'après la littérature. L'étude d
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10

Logvinov, Evgeny. "Two responses of a uniformly stratified flow over a sloping bottom to a spatially varying downwelling favorable wind." Thesis, Online version of original thesis, 2008. http://hdl.handle.net/1912/2500.

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11

Cirano, Mauro School of Mathematics UNSW. "Wintertime Circulation within the Southeast Indian Ocean: a Numerical Study." Awarded by:University of New South Wales. School of Mathematics, 2000. http://handle.unsw.edu.au/1959.4/17820.

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A numerical study is made of the wintertime circulation within the Southeast Indian Ocean (SEIO). The downwelling favourable winds result in a continuous eastward Coastal Current (CC) extending from Cape Leeuwin to the eastern coast of Tasmania, where it forms a confluence with the south branch of the East Australian Current. An additional forcing mechanism for the CC is the Leeuwin Current in the western part of the domain. The study here is divided in two parts: (1) available data and the wintertime averaged results from the Ocean Circulation and Climate Advanced Model (OCCAM) are analysed
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12

Lopes, Clarice Leão. ""Variação espaço-temporal do ictioplâncton e condições oceanográficas na Região de Cabo Frio (RJ)"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/21/21131/tde-19092006-093658/.

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O presente trabalho teve como objetivo principal descrever a distribuição espaço-temporal do ictioplâncton da região do cabo Frio (RJ) em relação aos processos físicos de mesoescala, com ênfase na distribuição vertical. A amostragem foi realizada em verão e inverno de 2001, com o N/Oc. Prof. W. Besnard, durante dois cruzeiros do projeto DEPROAS. O ictioplâncton foi coletado com rede Multinet, com 5 redes de 333 &#61549;m, sendo que cada estrato amostrado teve 20 m, até os 100 m de profundidade. Em laboratório, foram realizadas a triagem do ictioplâncton e identificação das larvas. A análise do
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13

Maria, Dulce Filomena Lajas 1972. "Improving the retrieval of downwelling surface shortwave fluxes using data from geostationary satellites." Doctoral thesis, 2012. http://hdl.handle.net/10451/7107.

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Shortwave radiation is a key quantity to estimate the surface radiation budget which has a close relationship with the climate of a given region. Shortwave radiation is affected by aerosols and clouds. Aerosols modify the Earth’s radiation budget and boundary layer meteorology by reflecting sunlight to space and absorbing radiation in the atmosphere. Clouds modulate the vertical and horizontal distributions of solar radiative heating, latent heat, and cooling by thermal radiation that drive the atmospheric circulation. The main objective of this thesis is to analyze in detail the methodo
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14

Crowe, Richard. "The Roles of Far Field Stress and Mantle Downwelling In Intraplate Deformation: The Michigan Basin." Thesis, 2012. http://hdl.handle.net/1807/33802.

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The Michigan basin has long been established as the type example of an intracratonic basin due to its near circular geometry and gently inward-dipping Paleozoic formations. The backstripping of major formations within the basin reveals that its geometry varied over the duration of the Paleozoic, displaying two distinct subsidence signals consisting of quasi-circular basin-centered subsidence interspaced with periods of irregular basin geometry. The quasi-circular basin-centred subsidence is thought to represent the surface expression of a driving mechanism located beneath the Michigan basin, w
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15

Chien, Ya-Tang, and 簡雅堂. "The condition for the significant upwelling and downwelling at eddy centers in the Northern South China Sea." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/z4437r.

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碩士<br>國立臺灣海洋大學<br>海洋環境資訊系<br>107<br>The South China Sea (SCS) is a semi-enclosed marginal sea, where is an eddy-active zone. Eddies play an important role in transporting heat and matters in the ocean. When a cyclonic eddy is generated, upwelling will occur at its center, but the situation is reversed for an anticyclonic eddy. Previously, satellite altimeters were often used to track eddies, and the upwelling and downwelling at eddy centers could be observed through satellite-measured sea surface temperature. However, we found that no significant upwelling or downwelling at some eddy centers i
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16

Chih-YuCheng and 鄭智羽. "Modeling the Distribution of Upwelling and Downwelling Areas in the Hyporheic Zone Using Field Investigation and Numerical Simulation." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/a2f7uf.

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碩士<br>國立成功大學<br>水利及海洋工程學系<br>105<br>In recent years, the hyporheic zone is getting more and more attention on extended knowledge, academic research, and water resources usage issues. It is of great importance to economic, environmental, biological phase. Besides field investigate, using known data for coordinate with numerical simulation to model deeper or wider unknown area is more often seen in the hyporheic zone. This study used field investigation to obtain hydrological and geographical information, then with the used of numerical simulation to model the correlations between surface water
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17

Lara, Espinosa Alejandra. "Determination of the acidification state of Canadian Pacific coastal waters using empirical relationships with hydrographic data." Thesis, 2012. http://hdl.handle.net/1828/4405.

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Despite recent interest in understanding long-term trends in ocean acidity, natural variations of carbon chemistry on short timescales are still poorly understood. Unfortunately, historical observations of the oceanic CO2 system are relatively few in number. Such data are particularly scarce along the highly productive Canadian Pacific coast. However, hydrographic data such as temperature, salinity, oxygen and nutrients have been collected regularly in this region. I developed a fully cross-validated statistical model to predict the aragonite saturation state (Ωarag), a biologically relevant m
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18

O'Brien, Mary C. "Physical processes and biogeochemistry of particle fluxes over the Beaufort slope and in Canada Basin." Thesis, 2009. http://hdl.handle.net/1828/1669.

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Sedimentation rates and compositions of sinking particles were investigated at three sites on the Beaufort slope and one in Canada Basin during the period 1990-1994 using moored sequential sediment traps. A method was developed to identify the terrigenous and biogenic components of the fluxes. The physical context including ice cover, ocean currents, river inputs, winds, air temperature, incident light, and nutrient availability provide essential information to the interpretation of the particle fluxes and to the understanding of shelf-basin sediment transport in this area. Eddies, internal wa
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