A5014171003- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Wind and Air Flow Studies
- Meteorological Phenomena and Simulations
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Air Quality Monitoring and Forecasting
- Radioactive contamination and transfer
- Climate variability and models
- Atmospheric Ozone and Climate
- Fire effects on ecosystems
- Radioactivity and Radon Measurements
- Vehicle emissions and performance
- Toxic Organic Pollutants Impact
- Mercury impact and mitigation studies
- Water Quality and Resources Studies
- COVID-19 epidemiological studies
- Aeolian processes and effects
- COVID-19 impact on air quality
- Geophysics and Gravity Measurements
- Urban Heat Island Mitigation
- Oil Spill Detection and Mitigation
- Cyclone Separators and Fluid Dynamics
- Nuclear and radioactivity studies
- Infection Control and Ventilation
NOAA Air Resources Laboratory
2008-2019
National Oceanic and Atmospheric Administration
2006-2016
NOAA Oceanic and Atmospheric Research
1990-2016
NOAA Earth System Research Laboratory
2013
Swiss Federal Laboratories for Materials Science and Technology
2013
Texas A&M University
2013
NILU
2013
University of Utah
2013
Forschungszentrum Jülich
2013
VA Office of Research and Development
2010
Abstract The Hybrid Single-Particle Lagrangian Integrated Trajectory model (HYSPLIT), developed by NOAA’s Air Resources Laboratory, is one of the most widely used models for atmospheric trajectory and dispersion calculations. We present model’s historical evolution over last 30 years from simple hand-drawn back trajectories to very sophisticated computations transport, mixing, chemical transformation, deposition pollutants hazardous materials. highlight recent applications HYSPLIT modeling...
Abstract. Both the root mean square error (RMSE) and absolute (MAE) are regularly employed in model evaluation studies. Willmott Matsuura (2005) have suggested that RMSE is not a good indicator of average performance might be misleading error, thus MAE would better metric for purpose. While some concerns over using raised by et al. (2009) valid, proposed avoidance favor solution. Citing aforementioned papers, many researchers chose to present their statistics when presenting or adding...
Abstract. Both the root mean square error (RMSE) and absolute (MAE) are regularly employed in model evaluation studies. Willmott Matsuura (2005) have suggested that RMSE is not a good indicator of average performance might be misleading thus MAE would better metric for purpose. Their paper has been widely cited may influenced many researchers choosing when presenting their statistics. However, we contend proposed avoidance use solution to problem. In this technical note, demonstrate...
Abstract. Temporal variations in the amount of radionuclides released into atmosphere during Fukushima Daiichi Nuclear Power Station (FNPS1) accident and their atmospheric marine dispersion are essential to evaluate environmental impacts resultant radiological doses public. In this paper, we estimate detailed releases using a reverse estimation method which calculates release rates by comparing measurements air concentration radionuclide or its dose rate environment with ones calculated...
Abstract An overview of the National Oceanic and Atmospheric Administration’s (NOAA) current operational Smoke Forecasting System (SFS) is presented. This system intended as guidance to air quality forecasters public for fine particulate matter (≤2.5 μm) emitted from large wildfires agricultural burning, which can elevate concentrations unhealthful levels. The SFS uses Environmental Satellite, Data, Information Service (NESDIS) Hazard Mapping (HMS), based on satellite imagery, establish...
Five different atmospheric transport and dispersion model's (ATDM) deposition air concentration results for releases from the Fukushima Daiichi nuclear power plant accident were evaluated over Japan using regional (137)Cs measurements (131)I time series at one location about 110 km plant. Some of ATDMs used same others meteorological data consistent with their normal operating practices. There four global analyses sets available two high-resolution analyses. Not all able to use combinations....
Studies that have attempted to estimate sources and sinks of trace gases such as CO 2 with inverse calculations unanimously identify the lack continental stations a prime obstacle. Continental traditionally been avoided because difficulty interpretation due large time‐variability substance mixing ratios. Large variability is caused by proximity strongly variable in space time complicated airflow within lowermost 100–200 m planetary boundary layer. To address need for overcome problems...
A Lagrangian transport and dispersion model was modified to generate multiple simulations from a single meteorological dataset. Each member of the simulation computed by assuming ±1-gridpoint shift in horizontal direction ±250-m vertical particle position, with respect data. The configuration resulted 27 ensemble members. assumed have an equal probability. tested creating daily average air concentrations for 3 months at 75 measurement locations over eastern half United States during Across...
A source apportionment methodology has been implemented to estimate the contribution from different arid geographical areas levels of measured atmospheric particulate matter with diameters less than 10 μm (PM10). Toward that end, Hybrid Single‐Particle Lagrangian Integrated Trajectory model (HYSPLIT) used quantify proportions mineral dust originated specific in northern Africa. HYSPLIT simulates transport, dispersion, and deposition plumes as they travel receptors. This configured reproduce...
Between April 28 and July 19 of 2010, the U.S. Coast Guard conducted in situ oil burns as one approach used for management spilled after explosion subsequent sinking BP Deepwater Horizon platform Gulf Mexico. The purpose this paper is to describe a screening level assessment exposures risks posed by dioxin emissions from these fires. Using upper estimates burn emission factor, modeled air fish concentrations, conservative exposure assumptions, potential cancer risk was estimated three...
Abstract Three widely used Lagrangian particle dispersion models (LPDMs)—the Hybrid Single-Particle Integrated Trajectory (HYSPLIT), Stochastic Time-Inverted Transport (STILT), and Flexible Particle (FLEXPART) models—are evaluated with measurements from the controlled tracer-release experiments Cross-Appalachian Tracer Experiment (CAPTEX) Across North America (ANATEX). The LPDMs are run forward in time driven by identical meteorological inputs American Regional Reanalysis (NARR) several...
In October 2011 an American Geophysical Union Chapman Conference was held in Grindelwald, Switzerland, titled “Advances Lagrangian Modeling of the Atmosphere.” models are being applied to a wide range high-impact atmospheric phenomena, such as transport volcanic ash and dispersion radioactive releases. One common theme that arose during meeting is need for improved access output products forecast reanalysis systems, which used in-puts trajectory models. The steady increases horizontal...
Initialization and forecast fields from the National Weather Service's (NWS) Nested Grid Model (NOM) were archived on 90 km calculational grid at 2-hour intervals out to 12 hours twice per day, for 3-month period of January–March 1987. The resulting time series meteorological data used determine sensitivity calculated trajectories changes in temporal spatial density during a wide range synoptic conditions. Trajectories started 63 evenly spaced locations, duration 4 days each over 74-day...
Some recent analyses of long-range transport and dispersion indicated conflicting results regarding the improvement in trajectory calculations when either spatial or temporal density meteorological data are enhanced. Tests conducted with a variety combinations data, collected during CAPTEX, showed that increased resolution did increase accuracy; however, it was not significantly different from enhancing coverage. Trajectory error assumed to equal distance between centroid locations measured...