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 31 for “"Mixed layer depth"”.
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Application of similarity theory to forecasting the mixed-layer depth of the ocean
… structure of the ocean, especially the uppermost mixed layer, greatly affects sonar ranges. In this paper, similarity theory is applied to the problem of forecasting the depth of the mixed layer during the warm season, assuming the controlling processes are secular, non-advective , and …
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The impact of increased grid resolution on the mixed layer depth variability in the South Atlantic Ocean and Southern Ocean
… study the impact of mesoscale variability on the Mixed Layer Depth in the Sub-Tropical and Sub-Antarctic Zone of the South Atlantic. The region is hugely impacted by the mesoscale variability as a result of the South African boundary currents. We use two regional simulations both at 1/4o …
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Comparison of the Observed Mixe Layer Depth in the Lee of the Hawaiian Island to the Modeled Mixed Layer Depth of the Regional Navy Coastal Ocean Model
<p>Accurately modeling the depth of the surface mixed layer in the lee of the Hawaiian Islands is important to naval operations because the area hosts numerous training exercises. Providing an accurate picture of the environment aids naval operators in making important tactical decisions. This …
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Characterizing and comparing the spawning habitats of anchovy (Engraulis capensis) and sardine (Sardinops sagax) in the Southern Benguela upwelling ecosystem
… temperature, nitrate concentration, water depth, salinity, current speed, wind speed and mixed layer depth, whereas biological variables included phytoplankton biomass (as 50m integrated chlorophyll a) and zooplankton biomass and production. The spawning habitats selected by anchovy and …
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Upper-ocean influences on hurricane intensification modeling
… use of satellite altimetry. Measurements of the mixed layer depth and upper-ocean heat content are incorporated into the model for Hurricanes Bret, Gert, Opal, Mitch and Dolly. This technique is shown to be quite reliable for many storms, especially in the Gulf of Mexico. Limitations are examined …
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Causes of the interannual variability of deep convection
… over one winter) on the final convective mixed layer depth and on the temperature and salinity of the water mass formed. This study focuses on the Mediterranean and uses datafrom the Medar/Medatlas and Dyfamed data sets. The heat fluxes are studied and characterised. It is shown that the …
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A Coupled Bio-Optical and Mixed Layer Model for the Equatorial Pacific
<p>A one dimensional coupled bio-optical and mixed layer model is developed and applied to problems involving the role of phytoplankton-induced turbidity (PIT) on the vertical structure and heating of the upper ocean in the Equatorial Pacific Ocean. The bio-optical and mixed layer model for …
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Inferring ocean circulation during the Last Glacial Maximum and last deglaciation using data and models
… greater sea ice extent, and changes in ocean mixed layer depth, and suggests that some features in the data are not robust. • A sensitivity analysis in the MITgcm demonstrates that changes in winds or in ocean turbulent transport can explain the hypothesis that the boundary between deep …
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Understanding the physical, chemical and biological processes across the subtropical convergence during austral automn
… was obtained and in-situ data were collected. Mixed layer depth (MLD), geostrophic velocities, density and Brunt Vaisala frequencies were calculated. The STC meandered across the survey area between 41 ° - 42°15'S. The total integrated Chl-a ranged from 12.8 to 40.1 mg Chl-a/m2. The most …
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Inferring ocean circulation during the last glacial maximum and last deglaciation using data and models
… greater sea ice extent, and changes in ocean mixed layer depth, and suggests that some features in the data are not robust. -- A sensitivity analysis in the MITgcm demonstrates that changes in winds or in ocean turbulent transport can explain the hypothesis that the boundary between deep …
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Quantifying spatial and temporal scales of phytoplankton variability in the Sub-Antarctic Ocean using a high-resolution glider dataset
… as a result of features that shoaled the mixed layer depth when the wind stress weakened, elevating light conditions for short periods and allowing increased growth. In summer phytoplankton blooms were found to occur at submesoscales periods as well. This variability was found to be driven …
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Characterization of a warm-cored agulhas ring travelling south of the subtropical front
… on the core properties of the ring such as its mixed layer depth and that the underlying topography such as the Agulhas ridge had a major effect on the behaviour and life span of the ring.
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The Study of the Indian Ocean Response to Climatic Events Using Satellite Observations and Model Simulations
… component of the MJO through changes in the mixed layer depth while the Rossby waves propagate westward.</p>
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Antarctic Bottom Water in CMIP5 models : characteristics, formation, evolution
… sea ice anomaly leading to anomalies in the mixed layer depth, is identified. Varying three vertical mixing parameters modifies the original mixed layer anomaly, leading to a range of responses from arrested deep convection to deep convection over the entire Weddell Sea. In the arrested …
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Distributions of <i>Euphausia Superba</i>, <i>Euphausia Crystallorophias</i>, and <i>Pleuragramma Antarcticum</i> with Correlations to Environmental Variables in the Western Ross Sea, Antarctica
… high-resolution circulation model (temperature, mixed layer depth, surface speed) and satellite-derived observations (chlorophyll, sea ice cover). These distributions were analyzed with a range of statistical methods to determine the extent to which species distributions are determined by …
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Spatiotemporal variability in Antarctic krill (Euphausia superba) around South Georgia from Antarctic fur seal (Arctocephalus gazella) diets at two long term monitoring sites
… the population. Using a multivariate approach, mixed layer depth, sea surface temperature, chlorophyll a, and salinity together explained 43% of the dissimilarities in krill length-frequency distributions predated by fur seals between seasons. Bird Island seals took significantly larger krill …
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Hydrographic Variability on Decadal and Interdecadal Scales in the Northern Gulf of Alaska
<p>The mixed layer depth (MLD) in the North Pacific is important to vertical mixing and hence the flux nutrients into the euphotic zone. A time series of hydrographic measurements, tem perature and salinity versus depth, at a coastal site in the northern Gulf of Alaska is used to determine the …
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The upper ocean response to the monsoon in the Arabian Sea
… the NE monsoon, the heat fluxes within the mixed layer are not significantly different from zero, and the large heat flux comes from advected changes in the thermocline depth. During the SW monsoon a coastal filament exports recently upwelled water from the Omani coast to the site of the …
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Development and application of the mollusc Arctica islandica as a paleoceanographic tool for the North Atlantic ocean
… which are attributed to regional differences in mixed-layer depth and the presence of deepwater sources. A 109-year interannual record of bottom temperatures for a location near the former Nantucket Lightship position has been reconstructed for the period 1875-1983 from the overlapped stable …
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Upper ocean response to storms: a resonant system
At mid-latitudes during the fall and winter, the mixed layer temperature (MLT) of the ocean decreases, mostly in short bursts associated with storms. These events have been dubbed episodic cooling events, although it has been shown (Large et al. 1986) that the associated decrease in MLT is …
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