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 34 for “"Large-Scale circulation"”.
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A Climatology of Tropical Anvil and Its Relationship to the Large-Scale Circulation
… of the radiative impact of tropical anvil on the large-scale circulation. Based on 10 years (1998-2007) of observations, anvil observed by the Tropical Rainfall Measuring Mission (TRMM) Precipitation (PR) shows significant geographical variations, which can be linked to variations in the parent …
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Links between climate feedbacks and the large-scale circulation across idealized and complex climate models
The circulation response to anthropogenic forcing is typically considered in one of two distinct frameworks: One that uses radiative forcings and feedbacks to investigate the thermodynamics of the response, and another that uses circulation feedbacks and thermodynamic constraints to investigate the …
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A study of the large scale circulation and water mass formation in the Nordic seas and Arctic Ocean
… Ridge has been considered. A new circulation scheme is developed which is consistent with the water masses, currents and air-sea fluxes in the region, and with the important observation that the dense overflows show little or no seasonal or interannual variability. An inverse box …
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A study of the large scale circulation and water mass formation in the Nordic seas and Arctic ocean
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, and the Woods Hole Oceanographic Institution, 1994.
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The dynamic role of ridges in a β-plane channel : towards understanding the dynamics of large scale circulation in the Southern Ocean
… the dynamics of both source-sink and wind driven circulations in a β-plane is similar to that in a dosed basin. First, wind-driven circulation in the inviscid limit is discussed in a linear barotropic channel model in the presence of a bottom ridge. There is a critical height of the ridge, above …
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The dynamic role of ridges in a β-plane channel : towards understanding the dynamics of large scale circulation in the Southern Ocean
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1993.
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The Spatial Structure of Turbulent Rayleigh-Benard Convection
The circulation cells visualized in the present study are a manifestation, in the fully turbulent regime, of the cellular structures commonly observed at low Rayleigh numbers. The circulation cells are proposed as a physical description (not an explanation) of the phenomenon referred to in the …
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Event characteristics of intra-seasonal climate circulations
… between rainfall variability and the general circulation. Seasonal rainfall totals are clearly linked to significant rain days, indicating the importance of evaluating synoptic-scale event characteristics. Rank ordered rainfall characteristics reveal that normal rainfall may be considered as …
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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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Sensitivity of tropospheric chemistry to the source of NO x from lightning : sensitivity simulations with the global 3D chemistry model for atmospheric transport and chemistry MATCH-MPIC
… sensitive, with effects comparable to, or larger than, those on O3. In all cases, the largest enhancements occur in the tropical upper troposphere, where lifetimes of most trace gases are longer and where they thus become more susceptible to long-range transport by large-scale circulation …
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The Hydroclimate Variability of Central Africa: seasonal cycle, mechanisms, teleconnections and impacts on neighbouring regions
… as well as to assess how an atmospheric general circulation model forced by observed sea surface temperature (SST), the ECHAM5.3 model, does represent the main features of Central Africa hydroclimate variability. The seasonal cycle of Central Africa rainfall is primarily driven by change in the …
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A descriptive physical analysis of water movement in the South West African Indian Ocean during the Northeast monsoon season
… and velocity structure from year to year. The large scale circulation in depth of the ocean is described. It is found that the Agulhas Current derives its supply of water from different sources at different depths and that at depth a large measure of recirculation of Agulhas Current Water takes …
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Interannual variability of the Atlantic Hadley circulation in boreal summer and its impacts on tropical cyclone activity
… was developed to define the regional Hadley circulation (HC) in terms of the meridional streamfunction. The interannual variability of the Atlantic HC in boreal summer was examined using the EOF analysis. The leading mode (M1), explaining more than 45% of the variances, is associated with the …
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Physical Oceanographic Controls on Biological Production and Ocean-Atmosphere Carbon Flux in the North Pacific
… by considering them in the context of the large-scale circulation in which they occur. Both processes occur in the North Pacific transition zone (NPTZ), a basin-wide region near the subpolar-subtropical gyre boundary. </p><p>First, this work investigates the physical forcing behind the …
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Parameterization of convection in a rotating stratified ocean : comparison of numerical and laboratory experiments with theory
… are derived to describe the length and velocity scales of the convective chimney as it adjusts under gravity and rotation, and breaks up through baroclinic instability. The scales of interest include the number (M), size (leddy) and strength (Urim) of the baroclinic eddies formed. Also of …
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Development of a correction approach for future precipitation changes simulated by General Circulation Models
… changes in precipitation at local- and regional-scales remains an important challenge in climate change science. Statistical downscaling methods are often utilised to bridge the gap between the coarse resolution of General Circulation Models (GCMs) and the higher-resolutions at which information …
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Subduction in an eddy-resolving state estimate of the northeast Atlantic Ocean
… to produce a state estimate of the ocean circulation. The estimate is a synthesis of a variety of in-situ observations from the Subduction Experiment, TOPEX/POSEIDON altimetry, and the MIT General Circulation Model. A novel aspect of this work is the search for an initial eddy field and …
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Transport and retention of benthic marine invertebrates in the Southern Tauranga Basin
… invertebrate larvae in Tauranga Harbour, a large (218 km2), shallow (mean depth = 2.8 m) meso-tidal estuary. Previous studies indicate that residence times extracted from hydrodynamic modelling vary throughout the harbour, due to residual circulation patterns caused by complex channel …
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Residual overturning circulation and its connection to Southern Ocean dynamics
… our understanding of the meridional overturning circulation has improved, but primarily in a two-dimensional, zonally-averaged framework. In this thesis, I have pushed beyond this simplification and shown that the additional complexity of meanders, storm tracks, and other zonal asymmetries is …
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Dynamic and Thermodynamic Controls on the Amount and Distribution of Orographic Precipitation
… in the Washington Cascades. Fluctuations in the large-scale circulation over the North Pacific is found to explain around 70\% of interannual variability in the wintertime rain shadow. Across individual storms, the strongest rain shadows are found to be associated with warm-sector events, while …
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