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 33 for “"ERA-Interim"”.
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Arctic synoptic activity associated with sea ice variability using self-organizing maps
… Weather Forecasts (ECMWF) Re-Analysis (ERA-interim, or ERAI) provides the daily sea level pressures from which the SOMs are computed. Time series of frequencies and durations of synoptic weather patterns are correlated with two sea ice metrics, Fram Strait ice outflow and year-to-year …
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Simulating the characteristics of tropical cyclones over the South West Indian Ocean using an adaptive Stretched-Grid Global Climate Model
… Climatology Project (GPCP) satellite data, and ERA-Interim (ERAINT) reanalysis data. The study also considers the impact of El Niño Southern Oscillation (ENSO), Indian Ocean Dipole (IOD) and the South Atlantic Subtropical Dipole (SASD) on TC counts over the SWIO.
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Role of multiscale atmospheric conditions in the evolution of convective organization during MJO-1 of DYNAMO/CINDY/AMIE
… of S-PolKa dual-polarization radar and 6-hourly ERA-interim reanalysis data shows the multiscale atmospheric conditions and changes in convective organization during a central Indian Ocean Madden-Julian Oscillation (MJO) event observed by the DYNAMO/CINDY/AMIE field campaigns in October 2011. …
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Stratospheric ozone and Southern Hemisphere climate change : impacts and robustness in CMIP5 models
… to changes in precipitation, atmospheric temperatures and winds. This dissertation investigates how well the models from the most recent Coupled Model Intercomparison Project (CMIP5) represent these changes and searches for consistencies and differences across the models. Comparisons are made …
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Capability of CORDEX RCMs in simulating extreme rainfall events over South africa
… Climate Downscaling Experiment (CORDEX) and used ERA-Interim (ERAINT) as their boundary forcing. The simulations were compared to two observation datasets (TRMM and GPCP), and to ERAINT rainfall data to understand whether these RCMs improve on the results from ERAINT. A self organizing map (SOM) …
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Understanding a high resolution regional climate model's ability in simulating tropical East Africa climate variability and change
… mean climatologies of rainfall, surface temperature and surface winds over East Africa, and representations of the observed annual cycles and inter-annual variability of rainfall and surface temperature. This study utilizes reanalysis and observational datasets: a hindcast of HIRHAM5 forced …
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Regional flow conditions associated with stratocumulus cloud-clearing events over the southeast Atlantic
… of kilometers in length that generally moves westward away from the African coast. Because marine stratocumulus clouds exert a strong cooling effect on the planet, any phenomenon that acts to erode large areas of low clouds may be climatically important. Previous satellite-based …
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Impact of spatio-temporal variability of the Mascarene High on weather and climate over Southern Africa
… 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 the Mascarene High …
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An Investigation of the Distribution of Ozone-depleting Substances in the Upper Troposphere and Lower Stratosphere
… the meteorological fields were nudged using the ERA-Interim Reanalysis and a specified tracer was employed for each halocarbon species, with hemispherically-defined surface measurements used as the boundary condition. This modified halocarbon experiment is known as CMAM30HR. A comprehensive …
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Atlantic tropical cyclone formation: Pre-genesis evolution of tropical easterly waves and impacts of the middle to upper tropospheric dry air
… of vorticity. The composites derived from the ERA-Interim reanalysis reveal higher specific humidity and equivalent potential temperature near the center of the wave critical layer, especially in the middle troposphere within one day prior to genesis. The study then focuses on the formation of …
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The influence of horizontal resolution and boundary forcing in simulating hurricanes over the South Atlantic Ocean using WRF
… km, and 30 km), using two reanalysis datasets (ERA-Interim (hereafter ERAINT) and NCEP CFSR (hereafter CFSR)) as the boundary forcing data. The performances of the reanalysis and WRF are compared with observational data from the International Best Track and Archive for Climate Stewardship. The …
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Assessing the representation of teleconnective drivers of rainfall over Eastern Africa in global and regional climate models and projected future changes
… variability for Africa is the sea surface temperature (SST) - rainfall teleconnection, such as the El Ni˜no/Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD). In this study, an assessment of the teleconnection between tropical SSTs and Eastern African rainfall in global and regional …
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Reducción de la incertidumbre en datos de radiación solar para la mejora de la simulación de sistemas fotovoltaicos
… The uncertainty further increased due to operational failures, which were very common in regional and agricultural networks, leading to uncertainties in measurements higher than those of the best radiation databases. Moreover, these defects were not detected by the most widely used QC …
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Dreidimensionale Diagnostik der großskaligen Zirkulation der Tropo- und Stratosphäre
… auf der Wellenausbreitung und auf der Interaktion der atmosphärischen Wellen mit dem Grundstrom. Die Konzepte werden hergeleitet, wobei eine neue Form des lokalen Eliassen-Palm-Flusses unter Einbeziehung der Feuchte eingeführt wird. Angewendet wird die Diagnostik dann auf den …
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Understanding the spatial distribution of the Southern Hemisphere near-surface westerlies and Its trends
In some experiments in which idealized general circulation models (GCMS) are used to study the tropospheric response to stratospheric perturbations, the tropospheric response is much stronger and longer-lived compared to observations (e.g., Polvani and Kushner 2002, Kushner and Polvani 2004). Chan …
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HF Radar Observations of Inter-Annual variations in Mid-Latitude Mesospheric Winds
… all radar beam directions to calculate hourly averages of the zonal and meridional components of the mesospheric neutral wind. Subsequent analysis of 13 years (2002-2014) of zonal wind data produced using this technique indicates that there is indeed a significant QBO signature present in …
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The impact of tropical sea surface temperature perturbations on atmospheric circulation over north Canada and Greenland
… that cause them. Remote tropical sea surface temperatures (SST) have been identified in previous studies as having contributed to the recent positive trends in surface temperature and geopotential height at 200 hPa over north Canada and Greenland (1979-2012) through poleward propagating Rossby …
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Estudio de la evolución del clima futuro de la región del mediterráneo con un modelo climático regionalmente acoplado
Hacia finales del siglo XXI, se espera que el mar Mediterráneo sea una de las regiones más vulnerables a sufrir los efectos introducidos por el cambio climático. En este contexto, el cambio climático se sitúa sobre el corazón del desarrollo sostenible en el Mediterráneo. Como tal, la región es …
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Investigating the sensitivity of one-dimensional turbulence schemes in the sub-Antarctic Southern Ocean
… data were obtained from various reanalyses (ERA-Interim, NASA, NCEP and JRA55) and were likewise tested. Different turbulence diagnostics and univariate indicators were chosen to ascertain the turbulence response and to analyse the energetics of the water column. It was found that using …
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Quantifying the SST biases in data assimilative ocean simulations of the Benguela Upwelling System
… study the impact of assimilating sea surface temperature (SST) and along-track sea level anomalies (SLA) observations on predicted upwelling dynamics in the Benguela. In order to evaluate the predictive skill and impact of data assimilation, three experiments with HYCOMEnOI are evaluated: (1) with …
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