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 30 for “"Sea level pressure"”.
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Linkages between Eurasian snow cover and Northern Hemisphere winter-time climate variability
… 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 ESCSON and winter climate variables were surveyed by use of …
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Seasonality of circulation in southern Africa using the Kohonen self-organising map
… is then illustrated using observed daily sea level pressure (SLP) from the Australian Southern Hemisphere data set. To put the technique in the context of global climate change studies, a further example using simulated SLP from the GENESIS version 1.02 General Circulation Model (GCM) is …
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MACHINE LEARNING APPROACH FOR EVAPORATION DUCT NOWCAST
… (EM) signal propagation close to the air-sea interface. Hence, the accuracies of EDH and EDS affect radar and communication propagation, which can be exploited for detection and counter-detection operations. The EDH/EDS can be calculated utilizing meteorological and oceanographical (METOC) …
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Seasonal hydrological prediction in Great Britain – an assessment
This thesis assesses seasonal hydrological prediction in Great Britain. Firstly, the study evaluates river flow prediction using climate model output to drive a rainfall-runoff model in the Dyfi basin, Wales. Results show that climate model precipitation can not skilfully simulate Dyfi discharge. …
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Analysis of Roanoke Region Weather Patterns Under Global Teleconnections
… of the Troup Southern Oscillation Index (SOI), a sea level pressure based index. Meanwhile, in the second chapter the author has related or an attempt has been made to relate global teleconnections (through ENSO and AO) to a synoptic scale, station-centered set of weather types in order to assess …
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Modeling Hourly Storm Surges using Deep Learning Techniques
… model surges using atmospheric variables (e.g., sea level pressure and winds) as predictors. ConvLSTM outperforms the others in predicting the overall variability of surges, extreme surge events, and statistical attributes of extreme surge hydrographs. The model’s efficiency is comparable to that …
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The role of atmospheric and oceanic forcing in Greenland outlet glacier behaviour
Satellite-derived sea surface temperature data and surface air temperature records from coastal Greenland weather stations were used to evaluate the respective roles of atmospheric and oceanic forcing on frontal position variations of Helheim, Kangerdlugssuaq Glacier and Jakobshavn Isbrae. At the …
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Synoptic Scale Weather Patterns Associated with Annual Snow Accumulation Variability in North-Central Greenland
… to 2008)) to identify recurring patterns in the sea level pressure (SLP) field that impact meteorological processes and explain annual variations of accumulation over North-Central Greenland for the 118 year period. The SOM algorithm identified 36 representative daily SLP patterns over the North …
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Impact of spatio-temporal variability of the Mascarene High on weather and climate over Southern Africa
… weather and climate over southern Africa at intraseasonal, seasonal, interannual, multidecadal and event time-scales. The Mascarene High is located 25-35°S, 40-110°E, playing a vital role in day-to-day weather and climate patterns conditions over southern Africa. Spatio-temporal characteristics of …
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Near-Surface Air Temperature in Complex Terrain: Daily Predictions of Fine-Scale (30 m) Temperature in the Snake Range, Nevada, USA
… have been studying it for centuries. Recently, researchers have used arrays of inexpensive temperature sensors to observe and understand temperature across the landscape. Much of this work has focused on landscape scale features as drivers of local air temperature's divergence from the greater …
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Paleoclimate reconstructions over the last century from a tropical speleothem on Niue Island, South Pacific
… and La Niña events during 1866-2002) and the sea level pressure differential (Samoa-Fiji)-based SPCZ index (SPI) that controls the interdecadal hydroclimate variability. Severe cyclones that directly impacted Niue Island over the last century are recorded by abrupt, large increases in trace …
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Reconstruction of the historical climate of the Southern Ocean from whaling ships’ logbooks
… observations from the whaling logbooks. The mean sea-level pressure (MSLP) changes across the Southern Ocean diverge: for example, in the northern reaches (55°S latitudinal band) MSLP in the historical period (the 1930s and 1950s) is found to be lower than modern climatology (1981-2010). It is in …
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Patterns of climate variability of the Northern Hemisphere wintertime circulation
… by the two leading PCs of the monthly-mean sea-level pressure (SLP) field poleward of 20°N is used as a basis for surveying the structure of the geopotential height and other fields. The leading EOF corresponds to the NH annular mode (NAM) and the second EOF resembles the Pacific-North …
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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
… that border the Indian Ocean are at risk due to sea level rise. However, sea level change in the Indian Ocean is poorly understood primarily due to short and sparse tide gauge observations. Although satellite altimetry provides accurate basin-wide sea level measurements, trends computed from its …
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Synoptic controls on ozone over the northeastern US and continental export
… between circulation and tropospheric ozone (O3) levels were investigated for the surface over the northeastern U.S. as well as for the spring-, winter- and summertime North American export and trans-Atlantic Transport. The latter studies utilized the Tropospheric Emission Spectrometer (TES) …
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What is Driving Changes in the Tropospheric Circulation? New Insights from Simplified Models
… the effects of stratospheric water vapor levels, which exhibit significant changes on both interannual and decadal timescales. It is shown that idealized thermal forcings mimicking increases in stratospheric water vapor produce poleward expansion of the Hadley cells (HCs) and poleward …
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Simulating South African Climate with a Super parameterized Community Atmosphere Model (SP-CAM)
… tested in simulating rainfall and temperature at seasonal timescales using the Root Mean Square Error (RMSE). It was found that CAM overestimates rainfall over the interior of the subcontinent during December - February (DJF) season whilst SPCAM showed a high performance in depicting summer …
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Study on the Intensity and Track Prediction of Typhoon Yagi (2024) Based on Ensemble Kalman Filter Assimilation of Satellite and Radar Data
… of Typhoon Yagi (2024). Based on the Weather Research and Forecasting (WRF) model and the EnKF method, a series of sensitivity experiments with different assimilated observational data types were conducted, including conventional observations, TCVitals data, Himawari-9 satellite radiance and …
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SYNOPTIC PATTERNS ASSOCIATED WITH NORTHEAST AND South east ice Storms
… Events Database, composites are generated for sea level pressure, 2-meter temperatures, 2-meter temperature anomalies, and 850-500 hPa dθ/dz from reanalysis data. Separately, MODIS retrievals of optical thickness, cloud-top pressure and temperature are analyzed to understand the cloud …
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The synoptic drivers of extreme rainfall in South Africa
… identified. These were then matched against mean sea-level pressure and 500hPa geopotential height circulation patterns obtained from the Climate Forecast System Reanalysis (CFSR) dataset to investigate the driving synoptics of extreme rainfall. Self-organizing maps (SOMs) were used to …
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