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.
Results
Showing 1 to 16 of 16 for “"El Niño events"”.
-
Spatiotemporal Variability of CO2, Solar-Induced Fluorescence, And Precipitation Over the Tropical Rainforests
… and ground-based datasets and empirical models to explore photosynthetic activity, spatiotemporal variability, and correlation among critical variables (e.g., Solar-induced chlorophyll fluorescence (SIF), CO2, precipitation, high vapor pressure deficit (VPD), and burned areas). Specifically, …
-
Hydrodynamics of a coral atoll lagoon and its connection to large-scale climate variability
… a high-resolution three-dimensional numerical model. The baseline hydrodynamic variability is characterized across tidal to seasonal timescales, showing that tidal flows through the ~500 m-wide single, bifurcated channel dominate circulation in lagoon regions near the channel and maintain water …
-
A Climatology of the Structure, Frequency, and Propagation of Midlatitude Cyclones that Affect North Carolina
… also played a role in midlatitude cyclone development. During El Niño events, an increase in Gulf type midlatitude cyclones occurred. During these events, intense rainfall occurred. On the other hand, during La Niña, Rockies were the dominant midlatitude cyclone type. These midlatitude …
-
Probabilistic estimation and prediction of groundwater recharge in a semi-arid environment
… for water resources management. Unfortunately, low recharge rates are difficult to resolve in dry environments, where groundwater is often most important. Motivated by such concerns, this thesis presents a new probabilistic approach for analyzing diffuse recharge in semiarid environments …
-
Variability of summer rainfall over southwestern Madagascar
… each station, the frequency of wet days was correlated with ENSO indices, SIOD index, SST, 850 hPa geopotential height, zonal and meridional winds at the surface. Composite anomalies of moisture flux and moisture flux convergence at 850 hPa, 500 hPa omega and velocity potential at .995 sigma …
-
Exploring Long-Term Flood Variability in the Lower French Broad River Using Fluvial Paleoflood Hydrology
… This research aims to reconstruct past flood events from flood deposits and examine flood variability over longer timescales. In doing so, the research provides insights into past climate, drivers of extreme floods, and changes in flood frequency and magnitude. This study focuses on the French …
-
Relationships between climate, growth and fisheries production in a commercially exploited marine fish
… condition, and fisheries production. Unfortunately, mechanisms driving these linkages are poorly understood for most exploited species, which hinders effective management. The purpose of this study was to use the Gulf Corvina (Cynoscion othonopterus), a heavily exploited marine fish in the Gulf …
-
Palaeoenvironments and Palaeoclimates During The Late Holocene in Lake Siscunsi (Colombia), A Multiproxy Perspective
… was under low hydraulic energy, representing relatively dry conditions, with low nutrient levels and lacustrine algae as the main source of organic matter; (2) from ~1,976 to 1,572 cal yr BP the littoral area expanded under more humid conditions, with an increase of C and N, where C3 plants and …
-
The El Niño - Southern Oscillation, rainfall and wheat yields in South Africa
This thesis assesses the relationships between the El Niño-Southern Oscillation (ENSO), rainfall and South African commercial winter wheat yields from 1974 - 2000. The analysis is through a combination of the Pearson's product moment correlation coefficient and an assessment of the magnitude and …
-
Insularity and Interaction: Investigating the role of exchange and inter-island interaction in the Banda Islands, Indonesia
… are employed to identify differences in relative connectedness between these sites and changes over time. Similarly, stable and radiogenic isotope ratios (δ13C, δ18O, 87Sr/86Sr, 206Pb/204Pb, 207Pb/204Pb, 208Pb/204Pb) are used to identify source groups and quantify source diversity for pigs …
-
An analysis of drivers of seawater temperature in Kuwait Bay, Arabian Gulf
… has been under pressure from urbanization as well as from development from the entire region of the Arabian Gulf. Seawater temperature has an important impact on the marine environment. The aim of this study is to evaluate the drivers of seawater temperature in Kuwait Bay over the last two …
-
Large-scale conditions that result in wet summers over arid Western Southern Africa
… across the region. Using a combination of satellite-derived rainfall products and ERA5 reanalysis, this study highlights the complex factors leading to summers with extreme rainfall in this typically arid area over the period 1981-2022. In the analysis, it is highlighted that the wettest …
-
Eastern Tropical Pacific Climate And El Niño Variability During The Past Millennium
<p>The El Niño Southern Oscillation (ENSO) has been implicated in large-scale climate shifts of the past millennia, but paleoclimate records from the dynamically vital eastern equatorial Pacific Ocean (EEP) spanning the past millennium are sparse. This has limited our understanding of tropical …
-
Diagnosis of the atmospheric hydrological cycle and its variability in the present-day climate
… notably greater in JRA-55 than in ERA-I and satellite-based estimates, while both reanalyses overestimate precipitation. Higher tropical precipitation and evaporation, accompanied by a slightly lower level of total column water (TCW), might suggest a more intense hydrological cycle, but this can …
-
Droughts and flooding rains: a fine-resolution reconstruction of climatic variability in Western Victoria, Australia, over the last 1500 years.
… Victoria. The study region is influenced by El Niño-Southern Oscillatio (ENSO), the Indian Ocean Dipole and the Southern Annular Mode and is currently experiencing the most severe and prolonged drought since instrumental records began (Murphy and Timbal, 2008; Ummenhofer et al., 2009). The …
-
Leaf and canopy responses to forest degradation and extreme climatic events: a remote sensing perspective
… ranging from the community to the landscape level. This thesis investigates the impacts of environmental change on foliar traits and forest structure. In particular, it investigates the impacts of El Niño on leaf traits using hyperspectroscopy and on the structure of forests modified by oil palm …