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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 “"EOF analysis"”.
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Relative sea-level variations revealed by tide-gauge records of long duration
… chosen for t heir special properties (regression analysis) or empirically determined (EOF analysis). Part 1 describes a regression model that allows for gradual changes of the RSL trend and for sudden changes in the level to which tide-gauge measurements are referred (gauge zero); also described …
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Impacts of large-scale soil moisture anomalies on regional hydroclimate in southeastern South America
… 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 modes of variability …
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The Role of Environmental Moisture on Tropical Cyclone Size and Structure
… land masses. An empirical orthogonal function (EOF) analysis is used to distinguish different environments based on the large-scale spatial pattern of total column water vapor (TCWV) surrounding the TC. Using these EOF patterns, four separate categories (groups) are created. Principal component …
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Mode Water in the Sea of Japan: A Study on the Reproducibility of Mode Water in the Data-Assimilating Regional Navy Coastal Ocean Model
… water evolution of the meander eddies. Two data analysis methods, EOF analysis and multi-variate regression analysis, are utilized to recreate synthetic profiles in the mean locations of the meander eddies during peak mode water occurrence months.</p>
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Summer sea surface temperature variability off Vancouver Island from satellite data, 1984-1991
… 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 Vancouver Island, a cool …
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Interannual variability of the Atlantic Hadley circulation in boreal summer and its impacts on tropical cyclone activity
… 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 intensity change of the ITCZ. M1 is significantly correlated to multiple climate factors and has strong impacts on the Atlantic tropical cyclone …
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Environmental analysis and prediction of transmission loss in the region of the New England Shelfbreak
… 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 loss in the ocean. In …
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Linkages between Eurasian snow cover and Northern Hemisphere winter-time climate variability
… the NOAA is used for snow cover, and NCEP/NCAR Reanalysis data are used for climate variables. The high latitudes sea-level pressure is quality-controlled by use of the IABP sea-level pressure dataset, which is derived from the buoy observations. Interannual variability of and association between …
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Relative Impacts of ENSO and Indian Ocean Dipole/Zonal Mode on Southern African Rainfall
… 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 in the dominant …
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Environmental analysis and prediction of transmission loss in the region of the New England Shelfbreak
… 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 loss in the ocean. In …
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Quantifying sources of uncertainty in regional climate model scenarios for Ireland
… biases were identified, however without further analysis, these biases cannot be attributed to a cause. Therefore, a spatial analysis, including EOF analysis, was undertaken which indicated that biases may be either spatially consistent (systematic) or inconsistent (random), an important …
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Decadal rainfall variability over Southern Africa
… of rainfall variability, demonstrated through EOF analysis and composite decadal events, is similar to that at interannual scales. Spectral analysis of observed data confirms the presence of variability at ENSO-related timescales, combined with influences in the 10-12 year and 16-20 year band. …
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On the Low-Frequency Current and Temperature Fluctuations Along the Shelf Break in the South Atlantic Bight
… Atlantic Bight were analyzed using a spectral analysis technique. The power spectra of both alongshore currents and temperatures (upon removal of seasonal trends) in the mid- to lower water column suggest a significant energy peak at 28 days. The spatial characteristics of the fluctuations …
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Atlantic tropical cyclone formation: Pre-genesis evolution of tropical easterly waves and impacts of the middle to upper tropospheric dry air
… The composites derived from the ERA-Interim reanalysis reveal higher specific humidity and equivalent potential temperature near the center of the wave critical layer, especially in the middle troposphere within one day prior to genesis. The study then focuses on the formation of the Cape Verde …
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Relationships between wintertime modes of atmospheric variability on intermediate and long timescales
… (> 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 long timescales to resemble the North Atlantic Oscillation (NAO) and the Pacific-North America (PNA) pattern. The …
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Improving Our Understanding of Atmospheric Aerosols and Their Climate Effects: Implications for Satellite Retrievals and GCM Simulations
… both observational data and model simulations. EOF analysis of Aerosol Index (AI) product from Total Ozone Mapping Spectrometer (TOMS) and Ozone Monitoring Instrument (OMI) reveals global distribution of absorbing aerosols, with major sources lying in Sahara deserts, the Sahel region, South …
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Impacts of climate changes on the spatiotemporal distribution of precipitation in the western United States
… States using Empirical Orthogonal Function (EOF) analysis. The analysis has shown that the leading modes of R95 variability and the connections between local R95 and Sea Surface Temperature (SST) over Western United States are seasonally dependent. The first EOF mode of summer R95 is …
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Analysis of Virginia Barrier Island Shoreline Movement and Correlations to Sea Level, Wave Height Changes, and Teleconnection Patterns
… ArcGIS software and the USGS Digital Shoreline Analysis System (DSAS). Geographically registered images were digitized, and multiple transect locations on each island were measured from a common offshore baseline using DSAS. The resulting distances along with the remote sensing image dates were …
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The Hydroclimate Variability of Central Africa: seasonal cycle, mechanisms, teleconnections and impacts on neighbouring regions
… and the Congo Basin Cell strength and width. The analysis of ECHAM5.3 experiments provide a support to these mechanisms. Finally, to unravel what are the physical mechanisms shaping the rainfall anomalies patterns associated with the interannual variability of Central Africa rainfall, we found out …