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 23 for “"Decadal variability"”.
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Decadal variability of the Atlantic Meridional Overturning Circulation
… numerous studies have suggested that AMOC variability plays a role in climate variability on a wide range of timescales. My focus is AMOC and ocean buoyancy variability on decadal timescales. Decadal variability of sea surface temperature (SST) has been observed in the instrumental record …
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Representation of Mean Precipitation and Decadal Variability in Atmosphere Models
In this thesis, I investigated how decadal sea surface temperature variability affects precipitation over Europe and the Sahel using the atmosphere model OpenIFS. I found that European extreme precipitation is better represented at higher horizontal resolution, while the model time step has a …
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Inter-Annual to Inter-Decadal Variability of Upwelling and Anchovy Population off Northern Chile
… thesis is to study the low frequency temporal variability of the upwelling system, to understand the spatial and temporal changes in the wind field, and how these changes may affect the upwelling and anchovy variability. Data used in this thesis includes time series of wind, sea level, sea …
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Understanding the role of stochastic atmospheric forcing in tropical Pacific decadal variability and ENSO modulation
Interdecadal variability of the tropical Pacific affects global hydroclimate and ecosystem and is suggested to modulate global mean temperature in the past century. It has been long acknowledged that Pacific decadal variability can be generated in the extratropics through integration of stochastic …
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Decadal variability of the subtropical gyre and deep meridional overturning circulation of the Indian Ocean
… and follows three lines of investigation: (i) decadal variability of the subtropical gyre circulation; (ii) decadal variability of the deep meridional overturning circulation (MOC); and (iii) the influence of diapycnal diffusivity on quasi-steady MOC states.<br/>The decadal variability of the …
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Decadal rainfall variability over Southern Africa
… with high seasonal and interannual rainfall variability combined with rain-dependent agriculture. This variability is underpinned by influences from ENSO and other oceanic forcing, and known to exhibit quasi-decadal variability at 16-20 years (Tyson, 1975). This study uses a combination of …
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Understanding drought propagation and its implications for drought management
… 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 drought …
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Coastal climate change and variability in the Benguela current system
… to seek to document the long-term change and decadal variability in the Benguela Upwelling System and study the possible mechanisms behind these changes. The Benguela Upwelling System is one of the four most productive fisheries areas in the world, and it is therefore important to understand …
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Studies of climate variability in a simple coupled model
The mechanisms of variability of a coupled atmosphere-ocean model are investigated through the study of two coupled configurations: an aquaplanet in which gyres are absent, and an aquaplanet in which a ridge extending from pole to pole supports gyres. Empirical Orthogonal Functions (EOFs) are used …
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Decadal to centennial-scale climate interactions across the Indo-Pacific region
An improved understanding of decadal to centennial-scale climate variability is critical for properly attributing recently observed low-frequency changes to internal climate oscillations and/or anthropogenic forcings as well as improving predictability of decadal variability. This thesis …
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Decadal to centennial-scale climate interactions across the Indo-Pacific region
An improved understanding of decadal to centennial-scale climate variability is critical for properly attributing recently observed low-frequency changes to internal climate oscillations and/or anthropogenic forcings as well as improving predictability of decadal variability. This thesis …
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Stratospheric ozone in the Earth system
… simulations is conducted to investigate multi-decadal variability. A striking finding is that low frequency variability of ozone in the tropical middle stratosphere resembles multi-decadal climate variability in Pacific Ocean sea surface temperatures. This analysis also shows that internally …
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HIGH-RESOLUTION RECORDS OF CLIMATE CHANGE FROM LACUSTRINE STABLE ISOTOPES THROUGH THE LAST TWO MILLENNIA IN WESTERN TURKEY
Knowledge of past chmate variability is vital if the causes of observed chmate changes since instrumental records began are to be fully understood, particularly those, post-1850 AD, possibly due to anthropogenic activity. The past two millennia provide a long enough background with which to compare …
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Understanding the Effect of Internal Climate Variability on 20th Century Indian Ocean Sea Level: Results from Newly Reconstructed Sea Level Data
… are heavily influenced by interannual to multi-decadal variability. To accurately project future Indian Ocean sea level trends using altimeter data it is imperative that trends associated with fluctuating internal variability (interannual-decadal) be identified and extracted, which in turn …
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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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A modelling perspective on precipitationin the Indus River Basin: from synopticto Holocene variability
… the archaeological context. Precipitation variability is investigated at various timescales due to their different impact on human societies and their importance in the climate system: the synoptic scale, the seasonal cycle, the inter-annual to multi-decadal variability, and the …
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Long-term climate variability at the Prince Edward Islands in the Southern Ocean
… trends reported by others. The change in decadal variability a decrease in air pressure of 4 hPa since the late 1990s to late 2000s, which coincided with a decrease in minimum and maximum air temperatures of 1°C over the same period; decrease in westerly wind and an increase in the …
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Climate variability in social-ecological systems of the Southern Cape: integrating farming and fishing perspectives
… example, the highly complex nature of climate variability in the southern Cape and on the Agulhas Bank, coupled with the lack of long-term environmental monitoring data, has resulted in knowledge gaps on how climate impacts these local social-ecological systems. This thesis focuses on bringing …
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Towards using neural networks for geoscientific discovery
… to identify predictable patterns of earth-system variability within climate models through its application to decadal predictability. We find that the interpretable neural networks identify known modes of oceanic decadal variability that contribute to predictability of continental surface …
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