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Showing 1 to 20 of 23 for “"CMAQ"”.
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Computational Tools for Chemical Data Assimilation with CMAQ
The Community Multiscale Air Quality (CMAQ) system is the Environmental Protection Agency's main modeling tool for atmospheric pollution studies. CMAQ-ADJ, the adjoint model of CMAQ, offers new analysis capabilities such as receptor-oriented sensitivity analysis and chemical data assimilation. This …
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Modeling secondary organic aerosol formation from biogenic hydrocarbons
… Community Multi-scale Air Quality Model v4.4 (CMAQ). CMAQ with the updated CACM and MPMPO was applied to the eastern United States (US) for August 3-4, 2004. It was found that SOA formation for this domain was dominated by monoterpenes. CMAQ with CACM and MPMPO predicted similar SOA formation …
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Improvement of MM5 Model Forecast by Ingesting Newly Archived Satellite Data and Estimation of Forest Fire Emissions Contribution to Ozone Peaks Using CMAQ Modeling System
… the Models-3/Community Multiscale Air Quality (CMAQ) modeling system to simulate air quality in the context of atmospheric chemistry. The three topics addressed were (1) the assimilation of a newly archived satellite (WINDSAT) data from National Polar-orbiting Operational Environmental Satellite …
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A response surface model of the air quality impacts of aviation
… Community Multiscale Air Quality (CMAQ) simulation system. The RSM relates changes in aviation emissions in the United States to changes in ambient concentrations of particulate matter, the main driver of the air quality impacts on public health. Specifically, the surrogate model …
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Efficient Computational Tools for Variational Data Assimilation and Information Content Estimation
… for Environmental Protection Agency's regional CMAQ regional air quality model. Both GEOS-Chem and CMAQ adjoint models are now used by the atmospheric science community to perform sensitivity analysis and data assimilation studies. Despite the continuous increase in capabilities, models remain …
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Modeling Interactions of Aircraft Emissions With Global and Regional Atmospheric Chemistry and Climate
… the Community Multiscale Air Quality Model (CMAQ) system. Our results suggest that the aircraft traffic at the Chicago O'Hare and Midway Airports do not contribute significantly to ground level ozone pollution in the Chicago area, and are much smaller than the effects due to other emissions …
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Bayesian spatio-temporal modelling for forecasting ground level ozone concentration levels
… as the Community Multi-scale Air Quality (Eta-CMAQ) forecast model that can forecast up to 24 hours in advance. However, these forecasts are known to be biased. The models proposed here<br/>are shown to improve upon these forecasts for a two-week study period during August 2005.<br/><br/>The …
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Cost-benefit analysis of ultra-low sulfur jet fuel
… science. This thesis focuses in detail on the CMAQ (Community Multi-scale Air Quality) model, used by the Environmental Protection Agency (EPA) to support regulatory impact assessment. Other models, their results, and efforts at inter-model comparison are also discussed. Benefits are monetized …
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Land-atmosphere Exchange and Air Quality during Stable Atmospheric Boundary Layer Events
… the Community Multiscale Air Quality Modeling (CMAQ) System. The objective of this research is to investigate the land-atmosphere exchanges and air pollution concentrations during PCAPs, where a case study for the surface turbulent fluxes over rolling terrain is conducted first to investigate …
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Implementing and Improved Soil NOx Parameterization in the Community Multiscale Air Quality Model: Implications for Air Pollution
… This work implements the BDSNP algorithm into CMAQ, adapting it to a 12km grid and comparing the resulting ozone, particulate, and other pollutants with results from the current YL95 algorithm for 2005 satellite data. Results show that summer NO emissions over the US double during the day, and …
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Unraveling atmospheric physics and chemistry of long-range transport of pollutants: Development of novel tools and methods
… Multiscale Air Quality Modeling System (CMAQ) to track concentrations of PM through their transport. Our results shed light on the impact of nitrate and sulfate from various parts of the NCP region to South Korea during the high peaks of PM2.5. In the third chapter, we introduced a …
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The impacts of aviation emissions on human health through changes in air quality and UV irradiance
… with the Community Multiscale Air Quality model (CMAQ), a more complex atmospheric chemistry model. The increase in adult premature mortalities in the U.S. caused by air quality impacts of aviation emissions in year 2005 is estimated at 210 deaths per year (90% confidence interval: 130 - 340). …
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The air quality and health impacts of aviation in Asia
… emissions, the Community Multiscale Air Quality (CMAQ) model---a regional-scale chemical transport model--utilized after its performance is evaluated in predicting ambient PM2.5 concentrations. Aviation emissions for 2006 are from the Aviation Environmental Design Tool (AEDT), and background …
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Sistema integrado para la modelización y el análisis de la calidad del aire en modo operacional
… USA), EMIMO (EMision MOdel, UPM, España) y CMAQ (Community Multiscale Air Quality modelling system, EPA, USA) El proceso de integración ha requerido la investigación y desarrollo de una serie de módulos de adaptación, dirigidos normalmente a la generación de forma consistente de cada uno de …
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Investigating the Impacts of Meteorology and Long-Range Transport on near Surface and Free Tropospheric Ozone over Texas
… the USEPA’s Community Multiscale Air Quality (CMAQ) model to characterize wind patterns associated with different ozone regimes. The model results indicated downwind pollution impacts from Houston on DFW ozone underscoring the impact of specific wind patterns on air quality in DFW. In my third …
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Development of a Python-based Data Assimilation Framework (PyDAF). Case Study: Refining Ammonia Emissions Through Observation Data
… study, we 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 …
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Development of a Python-based Data Assimilation Framework (PyDAF). Case Study: Refining Ammonia Emissions Through Observation Data
… study, we 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 …
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A Better Tropospheric Aerosol Analysis and Forecast Using Data Assimilation and Coupled Modeling
… we assimilated the GOCI AOD into the WRF-CMAQ two-way coupled model over East Asia during the KORUS-AQ period. Improvement of modeling performance on aerosol simulations enabled us to accurately quantify the impact of direct effects of aerosols. Stabilized atmospheric conditions increased …
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Development of techniques for rapidly assessing the local air quality impacts of airports
… from the Community Multiscale Air Quality (CMAQ) regional-scale model to account for primary and secondary PM2.5. Cases accounting for both landing-takeoff (LTO)-only and full-flight emissions were considered. Finally, premature mortalities at both regional and local scales were estimated by …
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