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.
Results
Showing 1 to 20 of 20 for “"WRF-Chem"”.
-
Simulation of an extreme wildfire event using the WRF-Chem model
… προσομοιώθηκε με το ατμοσφαιρικό μοντέλο WRF-Chem το οποίο είναι πλήρως συζευγμένο με τη χημεία και συνυπολογίζει τις αλληλεπιδράσεις μεταξύ αερολυμάτων και ακτινοβολίας. Δορυφορικά προϊόντα και δεδομένα παρατήρησης από σταθμούς χρησιμοποιήθηκαν για την αξιολόγηση των αποτελεσμάτων των …
-
Modeling nighttime chemistry with WRF/chem: sensitivity to vertical resolution and boundary layer parameterization
Tropospheric photochemistry and the formation of particulate nitrate depend critically on the budget of nitrogen oxides (NOx). The NOx budget in turn is tied to the nocturnal N2O5 hydrolysis reaction, which takes place in the aqueous phase of aerosols. Through this reaction, NOx is removed from the …
-
An Analysis of the Differences Between Two Seasonal Saudi Arabian Dust Storms Using WRF-Chem
… event is forced by more regional dynamics. The WRF-Chem (Weather Research and Forecasting/Chemistry) model was validated against the MERRA data and simulated these cases to estimate the TKE at low-levels for both the Sharav and Shamal case studies which caused high dust concentrations with a …
-
Examining Transportation of Natural Gas Exploration Emissions in the High Plains Region Using the Wrf-Chem Model
Surface ozone (O3) production relies on chemical reactions between nitrogen oxides (NOX) and volatile organic compounds (VOCs). Natural gas production is responsible for the production of both of these chemicals: heavy machinery in extracting processes generates nitrogen oxides and equipment leaks …
-
Toward assessing the effects of aerosols on deep convection: a numerical study using the WRF-Chemistry model
… The Weather Research and Forecasting model (WRF) has recently been coupled with an atmospheric chemistry suite and is jointly referred to as WRF-Chem, allowing atmospheric chemistry and meteorology to influence each other’s evolution within a mesoscale modeling framework. Provided that the …
-
Carbon Data Assimilation Using an Ensemble Kalman Filter
… Research and Forecasting model coupled with Chemistry (WRF-Chem). In spite of its global coverage, the CO retrievals from the Measurements Of Pollution In The Troposphere (MOPITT) instrument onboard the Terra satellite are available only once per day. There has been restricted use of these CO …
-
The transport of PM10 over Cape Town during high pollution episodes
… the Weather Research and Forecasting model with Chemistry (WRFChem). The observation data were used to identify PM10 episodes over the city between 2008 and 2014 and WRF-Chem was applied to simulate the atmospheric conditions and PM10 transport over southern Africa a few days before, during, and …
-
Aerosol-cloud-precipitation interaction based on remote sensing and cloud-resolving modeling over the Central Himalayas
… Research and Forecasting model coupled with Chemistry (WRF-Chem) in a cloud-resolving scale to better represent and study the impact of the aerosols from different sources through radiation and microphysics pathways over the complex terrain of the Central Himalayas. A cloud-resolving WRF-Chem …
-
Modeling study of air pollution in the Mexico City area
… problem in the Mexico City (MC) area. The WRF/Chem model is used to simulate the chemical oxidants and dust aerosols, including meteorological conditions. The observations during the 2006 MILAGRO (Megacity Initiative: Local and Global Research Observations) experiments are used to evaluate …
-
Mineral dust lofting and interactions with cold pools
… transport, and aerosol heating rates in the WRF-Chem regional model. On average, convection-permitting simulations exhibit higher surface wind speeds, enhanced convective activity, and drier soil, which leads to more dust emissions to the atmosphere. More frequent and stronger vertical …
-
Accelerating Atmospheric Modeling Through Emerging Multi-core Technologies
… model is developed to simulate atmospheric chemical transport and atmospheric chemical kinetics. The Cell Broadband Engine Architecture (CBEA), General Purpose Graphics Processing Units (GPGPUs), and homogeneous multi-core processors (e.g. Intel Quad-core Xeon) are introduced. These …
-
Modelling the atmospheric chemistry of volcanic plumes
… emissions rapidly undergo a complex series of chemical reactions. This thesis seeks to further the understanding of such processes by both observation and numerical modelling. I have adapted WRF-Chem to model passive degassing from Mount Etna, the chemistry of its plume, and its influence on …
-
Multi-Scale Atmospheric Dynamics of Extreme Saharan Dust Storms Resulting in Dust Transport Out of Africa to Iberia and the Atlantic
… Research and Forecasting model coupled with Chemistry (WRF-Chem) simulation. The current new findings include: (1) a double Rossby wave breaking (RWB) process in the polar jet stream linked through nonlinear wave reflection as an upper-level synoptic precursor prior to forming strong dust …
-
The transport of pollutants over South Africa and atmospheric sulphur in Cape Town
… sulphur pollution in Cape Town. Two atmosphere chemistry-transport models (RegCM-Chem and WRF-Chem) were used for this study. The models were applied to simulate the atmospheric flow and chemistry transport over South Africa for two years (2001 and 2002), and the results were validated with …
-
Development of a Python-based Data Assimilation Framework (PyDAF). Case Study: Refining Ammonia Emissions Through Observation Data
… introduced PyDAF version 1, supporting CMAQ and WRF-Chem models with iFDMB, 3D-VAR, 4D-VAR, and adjoint methods, using IASI, CrIS, satellite, and Nexrad radar data. For the validation, the Complex Variable Method and pseudo observations are employed. Applying PyDAF, we analyzed an ozone (O3) …
-
Development of a Python-based Data Assimilation Framework (PyDAF). Case Study: Refining Ammonia Emissions Through Observation Data
… introduced PyDAF version 1, supporting CMAQ and WRF-Chem models with iFDMB, 3D-VAR, 4D-VAR, and adjoint methods, using IASI, CrIS, satellite, and Nexrad radar data. For the validation, the Complex Variable Method and pseudo observations are employed. Applying PyDAF, we analyzed an ozone (O3) …
-
Cloud condensation nuclei in western Colorado: observations and model predictions
… System (RAMS). The RAMS droplet activation scheme was altered using parcel model simulations to include variations in aerosol hygroscopicity, represented by . Analysis of the parcel model output and a supplemental sensitivity study showed that model CCN will be sensitive to changes in …
-
Numerical Simulation of the Dynamics of Summer Shamal Dust Storms
… and scale numerical simulations utilizing the WRF-Chem model to investigate the atmospheric dynamics that are responsible for the formation of summer Shamal dust storms over the Low-Elevated (LE) region at 20^∘-30^∘N and 45^∘-55^∘E of the Arabian Peninsula (AP). Ten Shamal case studies based on …
-
Emissions From Concentrated Animal Feeding Operations During Wet and Dry Periods in the Southeastern United States
… the Weather Research and Forecasting model with Chemistry (WRFChem). Simulations were performed for the convective precipitation events that occurred over western Kentucky between July 7 and July 13, 2012. The spatial coverage of SO<sub>2</sub> emissions originating from the locations was reduced …