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 30 for “"orthogonal function"”.
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Dynamic Bayesian models for modelling environmental space-time fields
… Thirdly, we develop a Bayesian version empirical orthogonal function (EOF) method to incorporate the uncertainties due to temporally varying spatial process, and the spatial variations at broad- and fine- scale. Finally, we extend the BSP into the DLM framework to develop a unified Bayesian …
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Annular modes in multiple migrating zonal jet regime
… principal component (PC) of the first empirical orthogonal function (EOF) is positive (negative) and is referred to as the high (low) zonal index.
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Effect of internal solitary waves on mine detection in the western Philippine Sea east of Taiwan
… solitons were identifed during the empirical orthogonal function analysis. Without the IW and IS, the power spectra, structure functions, and singular measures (respresenting the intemittency) of the temprature field satisfy the power law with multi-scale characteristics at all depths. The IW …
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New identities for Legendre associated functions of integral order and degree
… of the space may be such that the Green's function of the second order differential operator can be expanded as an infinite series of orthogonal functions. In many coordinate systems (such as the spherical, spheroidal and some cyclidal systems) these expansions are given in terms of …
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Applications of time series analysis to geophysical data
… of one of the principal terms in the response function shows an abrupt rise in electrical conductivity to 0.05 mho/m near 160 km with no resolvable decrease below this. A model study suggests that moving source fields influence the induction appreciably in the other principal response tunction. …
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Summer sea surface temperature variability off Vancouver Island from satellite data, 1984-1991
… the west coast of Vancouver Island. Empirical Orthogonal Function (EOF) analysis of the spatial variance for 133 nearly cloud-free summer images was performed. The first EOF mode, which resembled the mean of all images, showed a strong cool water band located at the northwest corner of …
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Impacts of large-scale soil moisture anomalies on regional hydroclimate in southeastern South America
… atmospheric conditions. Multivariate empirical orthogonal function (EOF) analysis is performed using two-meter temperature, root-zone soil moisture, and precipitation data sourced from atmospheric reanalysis products for multiple decades. EOF analysis allows us to jointly extract the dominant …
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Environmental analysis and prediction of transmission loss in the region of the New England Shelfbreak
… temperature and sound speed fields. Empirical orthogonal function (EOF) analysis of the ocean sound speed field defined a set of perturbations to the background sound speed field for each of the NEST Scanfish surveys. Attenuation due to bottom sediments is the major contributor of transmission …
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Linkages between Eurasian snow cover and Northern Hemisphere winter-time climate variability
… statistical analysis techniques; Empirical Orthogonal Function (EOF) analysis, and correlation/regression analysis. The gravity current by the expansion of the cold, dense air over Siberia north- and westward remained one among the several possible mechanisms. The upper air mechanism may be …
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Relative Impacts of ENSO and Indian Ocean Dipole/Zonal Mode on Southern African Rainfall
… for the period 1950 to 1999. An empirical orthogonal function (EOF) analysis of OND rainfall field revealed that the north-south aligned areas of the eastern SADC are located in different covariability regions. This meridionally aligned dipole rainfall anomaly configuration is captured only …
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Environmental analysis and prediction of transmission loss in the region of the New England Shelfbreak
… temperature and sound speed fields. Empirical orthogonal function (EOF) analysis of the ocean sound speed field defined a set of perturbations to the background sound speed field for each of the NEST Scanfish surveys. Attenuation due to bottom sediments is the major contributor of transmission …
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A new optimization method for reservoir systems
… backgrounds. The new approach, called Orthogonal Function Dynamic Programming (OFDP), brings together and extends classical results from function approximation theory to circumvent the computational limitations of ordinary DP (also known as the "curse of dimensionality"). Chebyshev …
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Isolating the observed influence of vegetation variability of La Plata River basin on the climate of South America
… in space and time are analyzed using empirical orthogonal function/principal component (EOF/PC) analysis on a basin-wide scale. The dominant mode looks like a vegetation dipole, and can be explained using observed records of precipitation provided by the University of Delaware and the University …
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Influence of the Indian Ocean Subtropical Dipole on the Agulhas current
… through the application of the Empirical Orthogonal Function (EOF), Wavelet Analysis and Composite Map Analysis. The EOF applied to monthly SST anomalies for the months January to December during the years 1958-2007 in the SIO resulted in the SIOD phenomenon emerging as the second EOF mode …
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Near-Surface Air Temperature in Complex Terrain: Daily Predictions of Fine-Scale (30 m) Temperature in the Snake Range, Nevada, USA
… air mass. To this end, we conducted an empirical orthogonal function analysis of gridded sea level pressure (SLP) from 1951-2014 for a spatial window including the eastern Pacific and western North America, which identified a mode of SLP variability that well describes synoptic weather in our …
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On the Low-Frequency Current and Temperature Fluctuations Along the Shelf Break in the South Atlantic Bight
… determined using the frequency domain empirical orthogonal function (EOF) analysis applied to the concurrent current and temperature records. Consistent results were obtained from the upstream side of the Charleston Bump. Around the 28-day period, temperature seems to have little correlation with …
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Acoustic classification of zooplankton
… animal orientation. The feature based Empirical Orthogonal Function Classifier (EOFC) discriminates scatterer types by identifying characteristic modes of variability in the echo spectra, exploiting only the inherent characteristic structure of the acoustic signatures. The model based Model …
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Satellite-derived fluorescence quantum yields as indicators of phytoplankton photophysiology
… of dynamic water column mixing. An empirical orthogonal function analysis of the seven year time series finds strong seasonally-variable influences with a high degree of geographic complexity. Beyond large spatial and temporal patterns, this new satellite product effectively captures …
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Understanding the spatial distribution of the Southern Hemisphere near-surface westerlies and Its trends
… the South Pacific Ocean; furthermore, empirical orthogonal function analysis reveals that, over the South Pacific, the dominant mode of wintertime zonal wind variability is a splitting and un splitting of the jet. Ultimately, both the climatological split jet and its variability are determined …
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Inverse methods for sound speed estimation in the ocean
… includes derivatives with respect to Empirical Orthogonal Function coefficients instead of sound speed directly. First, the inversion technique is tested on synthetic arrival times, using Gaussian distributions for the errors in the considered arrival times. The approach is efficient, requiring …
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