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 20 of 47 for “"Multi-decadal"”.
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Multi-decadal morphodynamics of alternate bars in channelized rivers: a multiple perspective
… of alternate bars and the influence of different multi-decadal inflow conditions. The 42 km chosen reach is located along the border between Austria and Switzerland, between the confluences of Landquart and Ill rivers. The whole reach has been completely embanked starting from the 19th century, so …
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Developing A Global, Multi-decadal (1983-2017) Convection Tracking Database Utilizing ISCCP HXG Data
… Analysis of Clouds) framework. By applying multi-threshold feature detection, segmentation, and linking algorithms to infrared brightness temperature fields, convective systems are systematically identified and tracked through their life cycles. The resulting database provides a rich set of …
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Multi-decadal Dynamics of Southern Ocean Open-Ocean Polynyas and Deep Convection: Insights from Climate Models
… remain incompletely understood, particularly on multi-decadal to centennial timescales. This thesis investigates the dynamics and climate significance of Southern Ocean deep convection in preindustrial (non-anthropogenic) conditions, using diagnostic outputs from multiple climate models. First, …
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The Atlantic Ocean influence on hydroclimatic extremes: predictability and change from seasonal to multi-decadal time scales
L'abstract è presente nell'allegato / the abstract is in the attachment
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Annals of ivory : perspectives on African elephant Loxodonta africana (Blumenbach 1797) feeding ecology from a multi-decadal record.
… of diet allows diet switching to be studied over multiple space/time scales. Here, I use stable isotope data from elephant faeces, tail hair, and ivory to record short- (monthly), medium- (seasonal to annual), and long-term (decadal) ecological variability, respectively, of elephant diets in the …
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Phenology Effects on Carbon and Water Dynamics in a Pristine Boreal Fen A multi-decadal analysis from 2005-2007 & 2014-2022
… extent, as site-specific empirical evidence over multiple decades is lacking. This study investigates the role of phenology (leaf area index: LAI) for peatland C (net ecosystem exchange: NEE) and water fluxes (ET and water table: WT) by combining inter-annual and seasonal observations at the …
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Stratospheric ozone in the Earth system
… model (CESM1-WACCM), and existing multi-model output. This work evaluates past changes and explores future evolution of stratospheric ozone and associated climate impacts using multi-model output (ACCMIP simulations) from the pre-industrial period to the end of the 21st century. …
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Decarbonization of Power Systems, Multi-Stage Decision-Making with Policy and Technology Uncertainty
… change mitigation efforts. Nevertheless, given multi-decadal time horizons, planning for decarbonization must contend with uncertainty regarding technologies costs, new technologies characteristics and availability, and policies and incentives for reducing CO2 emissions in the multi-year …
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Understanding drought propagation and its implications for drought management
… rainfall. The spatial and temporal patterns of multi-decadal variability of meteorological droughts are analyzed to quantify the non-stationarity in meteorological drought risk. Furthermore, the regional drivers of multi-decadal variability are identified for the assessment of meteorological …
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High resolution sedimentary archives of past millennium hurricane activity in the Bahama Archipelago
… the forces that alter hurricane activity on multi-decadal to centennial timescales. This thesis uses proxy development and proxy-model integration to constrain the spatiotemporal variability in hurricane activity in the Bahama Archipelago over the past millennium. I present annually-resolved …
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Mechanisms of observed spatial heterogeneity in rainfall variability over the winter rainfall zone of South Africa
… a spatially localised but coherent quasi-cyclic multi-decadal pattern of repeated severe multi-year droughts over the WRZ. This low-frequency variability is not mirrored in the surrounding rainfall zones or any other winter rainfall region of the Southern Hemisphere extra-tropics. This finding …
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Using statistical learning approaches to understand trends and variability of tornadoes across the continental United States
… (SOI), North Atlantic Oscillation (NAO), Pacific Decadal Oscillation (PDO), Arctic Oscillation (AO), and Atlantic Multi-decadal Oscillation (AMO). The model provides a robust way of estimating the response coefficients by considering pooling of information across groups of states that belong to …
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Elevation Changes in Greenland over Two Decades from Cross-Platform LIDAR Analysis
… lines. Combined, these datasets offer a unique multi-decadal record of ice sheet change. The different beam trajectory technologies on each system require a specific methodology to compare coincident data between the systems. Here, a general slope-fit regression analysis is applied to difference …
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Modelling wind-driven inter-ocean exchange in the greater Agulhas with the regional ocean modelling system
… observations, despite higher simulated speeds. A multi-decadal strengthening of the eddy component of Agulhas leakage is ascribed to increases in anti-cyclone speed and cyclone size. Linear changes in trade wind intensity, imposed through a series of idealised wind stress anomalies, concomitantly …
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Climate and pro-glacial discharge interactions in the Pakitsoq region of Western Greenland.
… varies in response to climate forcing, a multi-decadal proxy record of meltwater discharge was established for the Paakitsoq basin, Western Greenland and analysed statistically. The hydrological response of the basin changes through time during the spring and summer due to the variations …
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Group size affects predation risk and foraging success in Pacific salmon at sea
… To overcome these difficulties, I analyzed a multi-decadal data set from sampling of Pacific salmon (Oncorhynchus spp.) in the ocean. Across all species, individuals in larger groups had lower risk of predator attack, inferred from wounds on surviving fish. Within groups, outliers (smaller and …
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American rivers are transporting more sediment in less time
… a continental-scale record capable of resolving multi-decadal shifts in both sediment yield and the timing of transport. Results show that many rivers deliver a greater portion of their annual sediment load in shorter, more extreme pulses; the median time required to transport 90% of the load …
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Assessing changes in pollen assemblage and charcoal accumulation during known changes in climate from c. 5,400 to 3,300 Years Before Present at the forest-prairie ecotone in Alberta, Canada
… to periods of enhanced aridity occurring at multi-decadal to centennial-scale cycles throughout much of the last 6000 years. To assess the ecotonal response to changes in effective moisture, as inferred by diatom-inferred salinity, temporal variations in pollen and charcoal preserved in a …
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Patterns of flow variability: consideration for river regulation and salmon management
… to improve populations. This thesis assembled multi-decadal datasets in the form of rod catch data, as a proxy to represent salmon populations. However, analyses provided limited meaningful insight into the relationship with flow. It is suggested that the multiple pressures impacting salmon …
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Bryophyte Community Response to Prescribed Fire and Thinning in Mixed-Oak Forests of the Unglaciated Allegheny Plateau
… on bryophyte diversity. Thinning may have a multi-decadal legacy effect on bryophyte species that does not appear to significantly degrade the bryophyte community.
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