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 12 of 12 for “"Zonal Winds"”.
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Quasi-objective Nonlinear Principal Component Analysis and applications to the atmosphere
… The compact NLPCA is applied to the zonal winds observed at seven pressure levels between 10 and 70 hPa in the equatorial stratosphere to represent the Quasi-Biennial Oscillation (QBO) and investigate its variability and structure. The two nonlinear principal components of the dataset …
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Analyzing el nino southern oscillation predictions from long-short-merm-memory models
… temperatures (SST), warm water volumes, and zonal winds as predictors, individually and in combinations, utilizing both monthly and daily resolution data, across a total of 11 leads. By utilizing these three variables, we examine different forms of climate variability within the coupled …
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Understanding the spatial distribution of the Southern Hemisphere near-surface westerlies and Its trends
… in the distribution of the latitude of surface zonal-mean zonal winds. Here, ERA-Interim and NCEP/NCAR reanalysis data are used to establish if this bimodality exists in the Southern Hemisphere (SH) near-surface winds, which would predict the existence of an additional mode of tropospheric …
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Downward influence of stratospheric final warming events in an idealized model
… final warming is the final transition of the zonal winds from wintertime westerlies to summertime easterlies as the solar heating of the high latitude stratosphere increases in the springtime. Recent observational analyses suggested that stratospheric final warming makes a significant …
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Impacts of Congo Convection on Tropical Africa's circulation, rainfall and resources
… is significant as indicated by the following. • Zonal winds accelerated from the west from 60 W (Atlantic) through 40 E $ahel). The relationship extends from surface to 500hPa with a peak at 600hPa. • Upper westerly winds are weakened over South Africa during JAS season, with the Congo convection …
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Observations of the thermosphere using measurements from long-term Fabry-Perot interferometers
… is to analyze the nighttime thermospheric winds and temperatures from data collected by Fabry-Perot interferometers (FPI) operating in Brazil, the United States, and Morocco. These instruments observe the 630.0-nm redline emission and estimate the neutral parameters from the Doppler shift …
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The role of wavenumber one and two in the development of sudden stratospheric warmings
… developments of vortex splits and the role of zonal winds in the tropics. In Chapter 2, we use correlations and regressions to demonstrate that the tropopause affects wavenumber one amplitudes more than wavenumber two. Thus, the statistical predictability of SSWs, based on synoptic events in …
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Morphology and dynamics of storm-time ionospheric density structures
… and examined in terms of thermospheric zonal winds pushing plasma upward/downward along magnetic field lines of opposite declination. Finally in Chapter 5 we summarize several co-authored studies which examined various storm-time phenomena utilizing GPS TEC mapping tools developed for …
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The impact of tropical sea surface temperature perturbations on atmospheric circulation over north Canada and Greenland
… from changes in mid-tropospheric temperature and zonal winds. The forcing from the tropical Atlantic, relative to the other tropical ocean basins, resulted in the largest eddy Z200 response over NCG, indicating its dominance in forcing the large scale tropical signal. The influence of …
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The impacts of Amazon deforestation on Pacific climate
… cloud amount, 500 hPa vertical velocity, surface winds, and 200 hPa winds) over the eastern Pacific indicate strong relationships among these fields. Maps of these correlations (teleconnection maps) reveal that when the Amazon is rainy SSTs in the central and eastern Pacific are cold, rainfall is …
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A Full-Wave Investigation of the Use of a 'Cancellation Factor' in GW-Airglow Interaction Studies
… dissipative, and with meridional and zonal winds). In the case including the influence of mean winds, we employ wind profiles representative of December 15 and GWs traveling in the eastward direction. These comparisons allow us to determine the accuracy of the calculations and the …
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Automated Detection and Analysis of Low Latitude Nightside Equatorial Plasma Bubbles
… the EPBs behave. Along with the ambient plasma, zonal and meridional thermospheric winds observed by ICON's Michelson Interferometer for Global High-resolution Thermospheric Imaging (MIGHTI) instrument are analyzed in conjunction with the same EPBs to understand how winds coincident with EPBs …