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 19 of 19 for “"Atmospheric variability"”.
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Relationships between wintertime modes of atmospheric variability on intermediate and long timescales
Variability in daily wintertime (DJF) 500 hPa geopotential heights on short (< 6 days), intermediate (6-30 days), and long (> 30 days) timescales is examined. Sectoral EOF analysis shows the leading patterns of variability on short timescales to correspond to the climatological storm tracks, and on …
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The role of short-term atmospheric variability in shaping Lagrangian transport in the Southern Benguela
… set-up. Simulation A is forced with a6 hourly atmospheric forcing (surface heat and fresh-water fluxes and wind stress). In simulation B and C, the atmospheric forcing is low-pass filtered with 5 days and 30 days cut-off periods. The ocean model outputs are averaged and saved at deferent …
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Temporal assessment of volatile organic compounds at a site with high atmospheric variability in the North–West Province
… from biogenic and anthropogenic sources with atmospheric lifetimes ranging from minutes to months, depending on the specific VOC compound considered. It is estimated that biogenic VOCs (BVOCs) (e.g. isoprenes, terpenes) make up 90% of the global atmospheric VOC budget. However, in highly …
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Radiometric validation of multi-spectral ocean colour satellite data in high biomass Southern Benguela waters
… reference to uncertainty derived from the atmospheric correction processes, which perform unreliably in many of the matchup instances. Results show that the accuracy of the atmospheric correction does not appear to be related to the in-water constituents and is more likely due to …
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Representation of Mean Precipitation and Decadal Variability in Atmosphere Models
… investigated how decadal sea surface temperature variability affects precipitation over Europe and the Sahel using the atmosphere model OpenIFS. I found that European extreme precipitation is better represented at higher horizontal resolution, while the model time step has a limited effect on …
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Influence of the Quasi-biennial Oscillation on Interannual Variability in the Northern Hemisphere Winter Stratosphere
Observations show that the interannual variability of the Northern Hemisphere (NH) extratropical winter stratosphere is strongly correlated with the quasi-biennial oscillation (QBO) of tropical stratospheric winds, particularly during early winter. Most current general circulation models (GCMs) do …
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High-resolution climatic study of the Norwegian and Iberian shelves during the late Holocene : a diatom perspective
… North Atlantic are closely linked to modes of atmospheric variability, the most dominant of which is the North Atlantic Oscillation. The aims of this study were to investigate high-frequency climate variability in the North Atlantic through the use of high-resolution fossil marine diatom …
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Numerical Simulations of the Rapid Cyclogenesis Over Canada and Evolution of a Cold Front Observed on 25-26 April 1979 (sesame-Ave-Iii)
… Environment Storm and Mesoscale Experiment-Atmospheric Variability Experiment) III. The objectives of this study are two-fold; one is to investigate the mechanisms of this rapid cyclogenesis, the other is to discuss the synoptic- and meso-scale environment with the cold front. A regional …
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Yawing effects in wind power plants: stochastic wake modeling and control
… effects of yaw misalignment due to control or atmospheric variability on turbine wakes and their interactions. In this approach, stochastically forced linear models of the turbulent velocity field are used to augment analytical descriptions of the wake velocity provided by low-fidelity …
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An investigation of atmospheric turbulence in the 100-105 km region over Cerro Pachón, Chile
… at higher altitudes, altering middle- and upper-atmospheric composition. Measurements of turbulence activity in the 100-105 km region improve understanding and modeling of atmospheric variability.
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Ocean model diagnosis of variability in the South Indian Ocean
… exists that sea surface temperature (SST) variability in the South Indian Ocean may significantly influence weather and climate patterns in the southern African region. SST, in tum, can be influenced by variability in ocean fluxes, observations of which are limited in the South Indian Ocean and …
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Analysis of the spatio-temporal sea level variability in extreme regions using in-situ and satellite remote sensing data: South Shetland region (Antarctica)
This thesis analysessea level variability in the South Shetland Islands through the integration of satellite altimetry, long-term in-situ oceanographic observations, and the analysis of extreme geophysical events. The study provides new insights into the processes that drive polar coastal …
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Investigation of Wind Variability in the South Atlantic Sector of the Southern Ocean and the Influence on the Upper Ocean in a Numerical Ocean Model
Several papers have linked climate variability in the Southern Ocean (SO) with the Southern Annular Mode (SAM), which has seen an increase in the positive phase since the mid-1960s, due to the Antarctic ozone depletion and emissions of greenhouse gases. The SAM is recognized as the main mode of …
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Studies of climate variability in a simple coupled model
The mechanisms of variability of a coupled atmosphere-ocean model are investigated through the study of two coupled configurations: an aquaplanet in which gyres are absent, and an aquaplanet in which a ridge extending from pole to pole supports gyres. Empirical Orthogonal Functions (EOFs) are used …
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An Assessment of the Relationship between Glacier Mass Balance and Synoptic Climate in Norway: Likely future implications of climate change.
… be significantly related to large-scale modes of atmospheric variability in the North Atlantic. Increased westerlies over Europe, particularly since the 1970s, are shown to significantly contribute to increases in temperature and precipitation over northern Europe while suppressing the penetration …
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Decadal variability of the Atlantic Meridional Overturning Circulation
… numerous studies have suggested that AMOC variability plays a role in climate variability on a wide range of timescales. My focus is AMOC and ocean buoyancy variability on decadal timescales. Decadal variability of sea surface temperature (SST) has been observed in the instrumental record …
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On the observed and simulated responses of the extratropical atmosphere to surface thermal forcing
… and local patterns of climate and weather variability from one region of the globe to another. Improvements in the resolution of satellite observations and numerical models over the past decade have led to a series of advances in understanding the role of the ocean in extratropical air-sea …