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 72 for “"El Niño/Southern Oscillation (ENSO)"”.
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Environmental change recorded in physical and geochemical proxies over the Last Glacial Cycle from two Northland, New Zealand dune lakes: Lake Kanono and Lake Kai Iwi
Lake sediment archives from Southern Hemisphere mid-latitude regions with maritime climates provide invaluable records of late Quaternary environmental change that are essential for the evaluation of inter-annual, decadal, centennial, and millennial-scale trends driven by shifting positions of the …
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Simulating the characteristics of tropical cyclones over the South West Indian Ocean using an adaptive Stretched-Grid Global Climate Model
… Ocean (SWIO) have used Global Circulation Models (GCMs) with uniform grid. This study examines the capability of a GCM with adaptive grid stretching (CAM-EULAG, hereafter CEU) in simulating the characteristics of TCs over the SWIO. In the study, the CEU model is applied with a fine horizontal …
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The Joint Influence of ENSO and NAO on US Landfalling Hurricanes and their Origination Points
… were utilized in order to characterize the relationship between the El Niño Southern Oscillation (ENSO) and the North Atlantic Oscillation (NAO). Global atmospheric anomalies were then examined in addition to hurricane landfall and origination locations (i.e., the position hurricane strength …
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The influence of the Indian and Atlantic Oceans on wet and dry spells over southern Tanzania
… floods and droughts. The Tanzanian population relies heavily on seasonal rainfall. Over the northern part of the country, the rainy season occurs in two phases, the short rains (October-December) and the long rains (March - May). Over the southern and the western areas, the rainy season occurs …
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THE APPLICATION OF THE MARSUPIAL AND ROTATING CONVECTION PARADIGMS TO UNDERSTANDING THE TROPICAL CYCLOGENESIS AND INTENSIFICATION OF HURRICANE MICHAEL (2018)
… genesis and intensification of Hurricane Michael (2018), which formed in the Northwestern Caribbean Sea on October 7, 2018. Using the Marsupial and Rotating Convection Paradigms, the study identifies the dynamic and thermodynamic processes influencing the development of the protective “pouch” …
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Teleconnective Influences on the Strength of Post-tropical Cyclones
… of Hurricane Ike (2008) and examining how teleconnections such as the El Niño Southern Oscillation (ENSO), the Madden-Julian Oscillation (MJO), the Atlantic Multidecadal Oscillation (AMO) and the Pacific Decadal Oscillation (PDO) contribute to the strength of a transitioning post-tropical …
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Analyzing the effects of unforced natural variability and anthropogenic forcing on ENSO variability using CESM
The El Niño-Southern Oscillation (ENSO) is an important contributor to Earth’s inter-annual climate variability, with worldwide weather effects (Whetton and Rutherfurd, 1994; Hoerling and Zhong, 1997; Dai and Wigley, 2000). Understanding how ENSO may change with climate is a major challenge, given …
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Low frequency variabilty of the Agulhas Current region in a numerical model
… of the Agulhas region was analysed in relation to temperature, sea surface height (SSH) and velocity within the current using output from a regional ocean model. Validation of the model with in situ and satellite observed values for the temperature and SSH showed the modelled SSH results …
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Long Term Ground Based Precipitation Data Analysis: Spatial and Temporal Variability
… response variables (classifiers) on various models applied to the detection of El Niño Southern Oscillation (ENSO) on California’s seven climate divisions by using modeled and gauge (in-situ/ground) precipitation measurements and various climate indices. Three scientific studies were conducted …
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Analysis of biomarker candidates from plant lipid inputs into Galapagos lacustrine sediments
… warming on the magnitude and frequency of the El Niño/Southern Oscillation (ENSO) phenomenon. Plant lipids identified in the sediment record of lakes in regions of high ENSO activity can act as biomarkers to reconstruct past precipitation patterns by measuring the D/H ratios preserved in these …
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The Asian Summer Precipitation Over The Past Five Centuries
… limited our ability to understand and accurately model low-frequency AM variability. This dissertation presents a gridded 544-year (from AD 1470 to 2013) Reconstructed Asian summer Precipitation (RAP) dataset by the weighted merging of two complementary proxies including 453 tree ring width …
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Simulating the Characteristics and Influences of the Botswana High over Southern Africa using the Model for Prediction Across Scales (MPAS)
… system that modulates rainfall over subtropical Southern Africa, but the capability of a Global Climate Model (GCM) to reproduce the characteristics and influences of this system on drought remains unknown. Furthermore, the summer variability of the Botswana High has been linked to the El Niño …
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Relative Impacts of ENSO and Indian Ocean Dipole/Zonal Mode on Southern African Rainfall
… the mainland region of southeastern Africa in relation to El Niño Southern Oscillation (ENSO) and the Indian Ocean Dipole/Zonal Mode (IODZM) 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 …
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Evaluating the efficacy of Tridacna derasa and Hippopus hippopus for measuring ENSO signatures in Palau
Tridacna shells are valuable archives in paleoclimate research due to their incremental growth bands, which record environmental conditions such as sea surface temperature (SST) and salinity through variations in oxygen isotopes (δ18O). Their potential for reconstructing past climate variability …
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The Study of the Indian Ocean Response to Climatic Events Using Satellite Observations and Model Simulations
… patterns during the Indian Ocean Dipole (IOD), El Niño-Southern Oscillation (ENSO), and the Madden-Julian Oscillation (MJO). Simple Ocean Data Assimilation (SODA) reanalysis of Sea Surface Salinity (SSS) from 1871-2008 is used to study the salinity variations during numerous phases of IOD …
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Simulation of variability in the tropical Western Indian Ocean
… circulation and properties in the Tanzanian shelf region in the tropical western Indian Ocean have been studied in this thesis using a regional ocean model. The study investigated the influences of the Northeast Madagascar Current (NEMC) in the Tanzanian shelf waters at the annual cycle. …
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Revisiting the links between the Southern Annular Mode and rainfall over the Western Cape region of South Africa
… to prolonged dry periods. Although not completely understood, a wide range of factors have been highlighted to contribute to this interannual variability. The relatively poor understanding of rainfall variability in this region is of concern considering the low rainfall received in 2015-2017, …
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Paleoclimate reconstructions over the last century from a tropical speleothem on Niue Island, South Pacific
The study examines the question whether speleothems from Niue Island (19°00'S, 169°50'W), a large carbonate platform located at the edge of West Pacific Warm Pool, can serve as archives of hydroclimate controlled by El-Niño/Southern Oscillation (ENSO) and of catastrophic cyclones that frequent the …
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The Evolution of the El Niño-Southern Oscillation and Tropical Pacific Climate Across the Last Deglaciation
<p>The El Niño – Southern Oscillation (ENSO) is the largest interannual component of Earth’s climate system, capable of exerting significant influence over global climate patterns that affect communities around the globe. Nevertheless, a comprehensive understanding of the ENSO system and its …
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The role of historical land-cover changes as a mechanism for global and regional climate change
This paper describes the results from several modeling studies and an observational analysis as to the effect of historical land-cover change on regional and global climates. We discuss methods for determining historical vegetation change and present results from model simulations at the global and …
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