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 19 of 19 for “"MERRA"”.
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Comparative analysis between MERRA and updated MEPDG climate database in the state of Tennessee
… Analysis for Research and Applications (MERRA) and the updated AASHTOWare databases as a source of MEPDG climate data inputs. A comparative analysis between these two climate data sources using eight LTPP sites in Tennessee was conducted. It was found that using MERRA as a climate data …
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North American monsoon precipitation and its precursors: processes at the seasonal and diurnal scale
… from the Modern-Era Retrospective Reanalysis (MERRA), the North American Regional Reanalysis (NARR), and Tropical Rainfall Measuring Mission (TRMM). Then WRF, MERRA, and NARR were used to investigate the relationships between precipitation and the other moisture budget variables, the …
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Using Reanalysis Data For The Prediction Of Seasonal Wind Turbine Power Losses Due To Icing
… Analysis for Research and Applications (MERRA) dataset in conjunction with turbine production data and in-situ wind measurements to investigate six methods of predicting seasonal losses (October-March) due to icing at two sites located in Petersburg, ND and Valley City, ND. The prediction …
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Acclimating across healthy and degraded reefs
… adaptation. Here we use two species -Epinephelus merra (a small grouper) and Sargassum polycystum C. Agardh (a brown macroalga)- which are found in both fished and protected reefs, to investigate this plastic response and understand how these species cope in healthy versus degraded environments. …
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An Analysis of the Differences Between Two Seasonal Saudi Arabian Dust Storms Using WRF-Chem
… to determine the dust source regions and the MERRA (Modern Era-Retrospective Analysis for Research and Applications) data for the large-scale analyses. Dust particles are generated from the Sahara Desert in the Sharav case; however, these particles are generated from the Syrian and Iraqi …
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Quantifying and reducing the uncertainties in global contrail radiative forcing
… contrails using two reanalysis models - ERA5 and MERRA-2. Using data from 793,044 radiosondes, persistent contrails forming at cruise altitudes in 30°N – 60°N are overestimated by factors of 2.0 and 3.5 for ERA5 and MERRA-2, respectively. I also define the evaporation depth, which measures the …
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Modeling landslide occurrence and impacts in a changing climate
… compared to relevant meteorological variables in MERRA reanalysis data to achieve a success rate of over 50% in matching observed landslide days within 7 days. The second analysis explores the effectiveness of machine learning as a technique to evaluate the likelihood of a slide to create high …
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Wind in the Upper Midwest: Assessing Wind Resource Variability and Representation in Reanalyses
… the variable exponent power rule applied to MERRA was able to achieve relatively close results with small mean biases. 80-meter wind fields were generated from MERRA using the variable exponent power rule for application in the final section of this study. The 80-meter wind fields were …
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Evaluation of climate data sources and investigation of performance prediction models for mechanistic-empirical pavement designs
… the most recent enhancements include addition of MERRA climate data (satellite-based data provided through NASA), a reflective-cracking model for overlay performance prediction, a tool to design short jointed plain concrete pavement (SJPCP) over asphalt concrete (AC), and major bugs were resolved …
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The role of wavenumber one and two in the development of sudden stratospheric warmings
… polar stratosphere during boreal winter. We use MERRA reanalysis data and the FMS shallow-water model to compare and contrast their propagation into the stratosphere, their interactions within the stratosphere, and their effects on the polar vortex. The results have implications for the …
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Uma análise do potencial eólico e solar em duas regiões distintas: estudo de caso para Gravatá-PE e Osório-RS
… por meio do programa Windographer®, do projeto MERRA-2. Os resultados para o recurso solar, apesar de algumas inconsistências, estão próximos daqueles obtidos das bases de dados para Gravatá-PE e Osório-RS. Quanto ao recurso eólico, os parâmetros de Weibull encontrados para ambos os sítios estão …
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Tropical orographic rainfall regimes according to the tropical rainfall measuring mission
… for Research and Applications (MERRA) data over the tropical Andes, Hawaii, Eastern Himalayas, Sierra Madre Occidental, and Western Ghats are used to evaluate thirteen variables and parameters including convective available potential energy, convective inhibition, lifting …
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Reducción de la incertidumbre en datos de radiación solar para la mejora de la simulación de sistemas fotovoltaicos
… We confirmed that former ERA-Interim and MERRA reanalyses should be avoided, but we found that ERA5 and COSMO-REA6 are valid alternatives to satellite-based databases. These results validated the incorporation of both reanalyses in the online simulator PVGIS. However, users should take …
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Mechanisms of Interactions between Aerosol Physics and Atmospheric Dynamics
… and TRMM as well as GOCART aerosol model and MERRA reanalysis indicates that the suggested results are consistent regardless of the selected data sets. Overall, we proposed that the regional radiative properties of aerosols and thermal/mechanical activity of wave-jet systems are dynamically …
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Modelado de procesos smed y tpm con ecuaciones estructurales: estudio del caso de la industria maquiladora mexicana
… el uso de versiones antiguas como ERA-Interim o MERRA, pero revelan que nuevos modelos como ERA5 o COSMO-REA6 son una alternativa válida. Estos resultados llevaron a la inclusión de ambas bases de datos en el simulador online PVGIS. Sin embargo, los usuarios de estos productos deben tener en …
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Arctic Cloud, Radiation and their Interactions with Sea Ice
… fluxes better than cloud properties, and MERRA-2 and JRA-55 have relatively better performance on the representation of Arctic cloud and radiation properties. This study paves the way for us to properly use these products in the following Arctic climate studies. Then we investigate the …
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Atmospheric Dynamics of Sub-Tropical Dust Storms
… dust storms. For each dust storm case study, MERRA reanalysis datasets, WRF simulated very high resolution datasets, MODIS/Aqua and Terra images, EUMETSAT images, NAAPS aerosol modelling plots, CALIPSO images, surface observations, and rawinsonde soundings were analyzed. The analysis of each …
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On the role of the Agulhas Current on weather and climate of South Africa
… for Research and Applications version-2 (MERRA-2) do represent the turbulent latent heat flux well when compared to high-resolution satellite data. ERA-Interim Reanalysis underestimates the turbulent latent heat flux due to reduced wind speeds. The observation-based National Oceanography …
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Understanding Middle Atmospheric Composition Variability from the Solar Occultation for Ice Experiment Instrument and Other Datasets
… analysis for Research and Applications (MERRA-2) observations. The event was similar to the major SSW-triggered descent events in the northern hemisphere since 2004 and led to the enhancement of nitric oxide produced by Energetic Particle Precipitation, attributed to unusual meteorology. …