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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 “"Weather Research And Forecasting Model"”.
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The Effect of Initial Conditions on the Weather Research and Forecasting Model
<p>Modeling our atmosphere and determining forecasts using numerical methods has been a challenge since the early 20th Century. Most models use a complex dynamical system of equations that prove difficult to solve by hand as they are chaotic by nature. When computer systems became more widely …
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A case study of weather research and forecasting model over the Midwest USA
Chemical Transport Models (CTMs) are important tools for air quality research, and it is of the same importance to provide accurate weather information as input data to CTMs. In this thesis, the Weather Research and Forecast (WRF) model was used as an input to a CTM and a sensitivity analysis of 17 …
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Modelling of the near-surface wind speed
… die Analyse der Ergebnisse von 16 globalen Klimamodellen, iii) die verbesserte Qualität der Windvorhersage, welche durch eine Weiterentwicklung des Mellor-Yamada-Janjic-Schemas im mesoskaligen Weather Research and Forecasting Model zur Parametrisierung der marinen unteren atmosphärischen …
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Investigation of the structure of natural orographic clouds embedded within atmospheric river type flow over the Payette Mountains in Idaho
The Seeded and Natural Orographic Wintertime clouds: the Idaho Experiment (SNOWIE) field campaign operated from January 7, 2017 – March 17, 2017, in the Payette Basin just northeast of Boise, ID. The goal of this campaign was to use radar and in-situ measurements to observe seeded and natural …
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Carbon Data Assimilation Using an Ensemble Kalman Filter
… step to build an ensemble data assimilation and source inversion system for atmospheric carbon, I implemented column-integrated carbon monoxide (CO) mixing ratio assimilation capability in an ensemble Kalman filter (EnKF) data assimilation system with the Weather Research and Forecasting …
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Accelerating Atmospheric Modeling Through Emerging Multi-core Technologies
… of computational power while respecting physical and economical constraints. The cost of this power is bewildering program complexity. Atmospheric modeling is a grand-challenge problem that could make good use of these architectures if they were more accessible to the average programmer. To that …
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Emissions From Concentrated Animal Feeding Operations During Wet and Dry Periods in the Southeastern United States
<p>Air quality modeling is a recent development in atmospheric science dedicated to simulating the characteristics of surface emissions within the context of a variety of meteorological conditions. In western Kentucky, there are several concentrated animal feeding operations (CAFOs) that emit a …
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Modeling the impact of iIrrigation on precipitation over the Great Plains.
… has been shown to modify the surface energy and water budgets over the Great Plains by altering the partitioning of latent and sensible heating. An increase in latent heating from irrigation contributes to a cooler and more humid surface, which has competing impacts on convection. In this …
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Multi-Scale Atmospheric Dynamics of Extreme Saharan Dust Storms Resulting in Dust Transport Out of Africa to Iberia and the Atlantic
Understanding the meteorological processes that organize Saharan dust plumes and their subsequent long-range transport is a major global concern. However, the state-of-the-science of the meteorological forcing mechanisms for dust emission over the complex terrain of North Africa is incomplete due …
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Interaction of an upper-tropospheric jet with a squall line originating along a cold frontal boundary
… frontal boundary was sampled during the Bow Echo and Mesoscale Convective Vortex Experiment. The Naval Research Laboratory P-3 aircraft and the National Oceanic and Atmospheric Administration P-3 aircraft simultaneously sampled the leading and trailing edge of this squall line, respectively, with …
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Outdoor wind speed enhancement in residential precincts in tropical cities
… Lower wind speeds inhibit passive ventilation and reduce thermal comfort in tropical cities. This thesis uses both experimental and computational fluid dynamics (CFD) modeling to explore the potential of building porosity to increase wind speeds at the pedestrian level. The computational models …
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The UK wind regime - Observational trends and extreme event analysis and modelling
… as a whole is a challenging region for forecast- and climate-modelling alike. In Europe, strong winds within extra-tropical cyclones (ETCs) remain on average the most economically significant weather peril when averaged over multiple years, so an understanding how ETCs cause extreme surface winds …
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Application of the Weather Research and Forecasting (WRF) Model to Simulate a Squall Line: Implications of Choosing Parameterization Scheme Combinations and Model Initialization Data Sets
… through the Ohio Valley resulting in four deaths and one injury. Such events highlight the importance of accurate forecasting for public safety. Mesoscale Modeling plays an important role in any forecast of a potential squall line. The focus of this study was to examine the performance of several …
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Land surface and orographic controls on precipitation patterns in the Sierra Madre Occidental and Western Ghats
Several aspects of land surface-atmosphere interactions cannot be adequately captured by climate models, due in part to inadequacies in representing small scale processes in space and time, such as diurnal cycles, convection, and cloud microphysics. Individual and collaborative efforts using …
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The influence of horizontal resolution and boundary forcing in simulating hurricanes over the South Atlantic Ocean using WRF
… (SAO). Hurricanes rarely form over this region and as such these communities are not prepared for them. Previous studies have suggested that anthropogenic warming may lead to more frequent hurricanes over the region and have demonstrated the capability of the Weather Research and Forecasting …
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Föhn winds on South Georgia and their impact on regional climate
South Georgia is a small and mountainous island, located in the remote Southern Ocean. The island’s subantarctic climate is controlled by its location and steep orography; with 19 peaks over 2000m and situated within a belt of strong westerly winds South Georgia acts as an effective barrier to the …
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Idealized particle-resolved large-eddy simulations to evaluate the impact of emissions spatial heterogeneity on CCN activity
… remain a large source of uncertainty in climate models due to complex, nonlinear processes that alter aerosol properties and the inability to represent the full compositional complexity of aerosol populations within large-scale modeling frameworks. The spatial resolution of these models …
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Using land cover changes to mitigate the impacts of hot temperatures in South African cities
… severe impacts on human health. Climate change and population growth are expected to exacerbate these impacts in the future, given that Southern Africa has been projected as a hotspot for future warming and growth. The added socio-economic factors leave a large proportion of South Africa's …
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Aerosol-cloud-precipitation interaction based on remote sensing and cloud-resolving modeling over the Central Himalayas
… Atmospheric aerosols can influence regional and global climate through aerosol-radiation (ARI) and aerosol-cloud interactions (ACI). The study of the aerosol-precipitation relationship over the Central Himalayan region during the summer monsoon season is important due to extreme pollution …
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The transport of PM10 over Cape Town during high pollution episodes
… study investigates the influence of remote and local pollution sources to PM10 episodes over the city. The study analysed observations from Cape Town’s air quality monitoring stations and simulations from the Weather Research and Forecasting model with Chemistry (WRFChem). The observation …
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