A5036721762- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Vehicle emissions and performance
- Air Quality Monitoring and Forecasting
- Climate variability and models
- Electric Vehicles and Infrastructure
- Meteorological Phenomena and Simulations
- Atmospheric aerosols and clouds
- Energy, Environment, and Transportation Policies
- Urban Transport and Accessibility
- Plant responses to elevated CO2
- Energy and Environment Impacts
- COVID-19 impact on air quality
- Fire effects on ecosystems
- Radioactive element chemistry and processing
- Environmental Policies and Emissions
- Coal Properties and Utilization
- Catalytic Processes in Materials Science
- Hydrocarbon exploration and reservoir analysis
- Noise Effects and Management
- Plasma Applications and Diagnostics
- Climate Change and Health Impacts
- Environmental and Cultural Studies in Latin America and Beyond
Cooperative Institute for Research in Environmental Sciences
2020-2025
University of Colorado Boulder
2020-2025
NOAA Global Systems Laboratory
2023-2025
NOAA Earth System Research Laboratory
2023-2025
National Oceanic and Atmospheric Administration
2021-2025
University of Colorado System
2024
Northwestern University
2018-2024
NOAA Chemical Sciences Laboratory
2023-2024
University of Nebraska at Kearney
2023
NOAA Oceanic and Atmospheric Research
2022
The goal of the Tropospheric Ozone Assessment Report (TOAR) is to provide research community with an up-to-date scientific assessment tropospheric ozone, from surface tropopause. While a suite observations provides significant information on spatial and temporal distribution observational gaps make it necessary use global atmospheric chemistry models synthesize our understanding processes variables that control ozone abundance its variability. Models facilitate interpretation allow us...
Heat waves and air pollution episodes pose a serious threat to human health may worsen under future climate change. In this paper, we use 15 years (1999-2013) of commensurately gridded (1° x 1°) surface observations extended summer (April-September) ozone (O
Abstract We describe the baseline model configuration and simulation characteristics of Geophysical Fluid Dynamics Laboratory (GFDL)'s Atmosphere Model version 4.1 (AM4.1), which builds on developments at GFDL over 2013–2018 for coupled carbon‐chemistry‐climate as part sixth phase Coupled Intercomparison Project. In contrast with GFDL's AM4.0 development effort, focused physical aerosol interactions is used atmospheric component CM4.0, AM4.1 focuses comprehensiveness Earth system...
More frequent atmospheric ridging and wildfires increase exposure of western U.S. population to co-occurring air pollutants.
The present work assesses the relationship between local and synoptic meteorological conditions surface ozone concentration over Europe in spring summer months, during period 1998–2012 using a new interpolated data set of observed concentrations European domain. Along with conditions, influence large-scale atmospheric circulation on is addressed through airflow indices computed novel implementation grid-by-grid weather type classification across Europe. Drivers full distribution maximum...
Abstract. Over the past few decades, geographical distribution of emissions substances that alter atmospheric energy balance has changed due to economic growth and air pollution regulations. Here, we show resulting changes aerosol ozone abundances their radiative forcing using recently updated emission data for period 1990–2015, as simulated by seven global composition models. The models broadly reproduce large-scale in surface based on observations (e.g. −1 −3 % yr−1 aerosols over USA...
Abstract Heavy-duty vehicles (HDVs) disproportionately contribute to the creation of air pollutants and emission greenhouse gases—with marginalized populations unequally burdened by impacts each. Shifting non-emitting technologies, such as electric HDVs (eHDVs), is underway; however, associated quality health implications have not been resolved at equity-relevant scales. Here we use a neighbourhood-scale (~1 km) model evaluate pollution, public equity 30% transition predominantly diesel...
The declining trend in vehicle emissions has underscored the growing significance of Volatile Organic Compound (VOC) from Chemical Products (VCP). However, accurately representing VOC chemistry simplified chemical mechanisms remains challenging due to its complexity including speciation and reactivity. Previous studies have predominantly focused on VOCs fossil fuel sources, leading an underrepresentation VCP sources. We developed integrated mechanism, RACM2B-VCP, that is compatible with...
Abstract. We test the current generation of global chemistry–climate models in their ability to simulate observed, present-day surface ozone. Models are evaluated against hourly ozone from 4217 stations North America and Europe that averaged over 1° × grid cells, allowing commensurate model–measurement comparison. generally biased high during all hours day regions. Most shape regional summertime diurnal annual cycles well, correctly matching timing (~ 15:00 local time (LT)) monthly...
Abstract. Northern India (23–31° N, 68–90° E) is one of the most densely populated and polluted regions in world. Accurately modeling pollution region difficult due to extreme conditions with respect emissions, meteorology, topography, but it paramount order understand how future changes emissions climate may alter region's regime. We evaluate ability a developmental version new-generation NOAA GFDL Atmospheric Model, 4 (AM4) simulate observed wintertime fine particulate matter (PM2.5) its...
Vehicle electrification is a common climate change mitigation strategy, with policymakers invoking co-beneficial reductions in carbon dioxide (CO2) and air pollutant emissions. However, while previous studies of U.S. electric vehicle (EV) adoption consistently predict CO2 benefits, quality outcomes are equivocal depend on policies assessed experimental parameters. We analyze health co-benefits trade-offs six EV scenarios: 25% or 75% replacement conventional internal combustion engine...
Abstract. From the ensemble of stations that monitor surface air quality over United States and Europe, we identify extreme ozone pollution events find they occur predominantly in clustered, multiday episodes with spatial extents more than 1000 km. Such scales are amenable to forecasting current global atmospheric chemistry models. We develop an objective mapping algorithm uses heterogeneous observations individual sites calculate averaged 1° by grid cells, matching resolution a model. Air...
Abstract The effect of future climate change on surface ozone over North America, Europe, and East Asia is evaluated using present‐day (2000s) (2100s) hourly simulated by four global models. Future follows RCP8.5, while methane anthropogenic precursors are fixed at year 2000 levels. Climate shifts the seasonal peak to earlier in increases amplitude annual cycle. Increases mean summertime high‐percentile generally found polluted environments, decreases clean environments. We propose that...
Abstract. US background ozone (O3) includes O3 produced from anthropogenic precursors emitted outside of the USA, global methane, and any natural sources. Using a suite sensitivity simulations in GEOS-Chem chemistry transport model, we estimate influence individual sources versus on total surface over 10 continental regions 2004 to 2012. Evaluation with observations reveals model biases +0–19 ppb seasonal mean maximum daily 8 h average (MDA8) O3, highest summer eastern USA. Simulated high-O3...
Abstract. A physics suite under development at NOAA's Global Systems Laboratory (GSL) includes the aerosol-aware double-moment Thompson–Eidhammer microphysics (TH-E MP) scheme. This scheme uses two aerosol variables (concentrations of water-friendly (WFA) and ice-friendly (IFA) numbers) to include interactions with some physical processes. In original implementation, WFA IFA depended on emissions derived from climatologies. our approach, using Common Community Physics Package (CCPP), we...
Despite decades of emission control measures aimed at improving air quality, Los Angeles (LA) continues to experience severe ozone pollution during the summertime. We incorporate cooking volatile organic compound (VOC) emissions in a chemical transport model and evaluate it against observations order improve representation present-day regime LA. Using this updated model, we investigate impact adopting zero-emission vehicles (ZEVs) on with increased confidence. show that mitigating on-road...
Extreme near-surface ozone concentrations often cluster into large episodes that last several days. They strongly depend on meteorology, precursor emissions, and ambient photochemical conditions. A new pseudo-Lagrangian algorithm has been employed to identify the spatiotemporal patterns of episodes, allowing for a good characterization their areal extent an assessment drivers. The used track in Europe from April September over twenty years (2003–2022) Copernicus Atmosphere...
There are two global aerosol forecast systems currently under development at NOAA, both of which coupled online with the Unified Forecast System (UFS), encompassing ocean, sea ice, wave and land surface components for Subseasonal to Seasonal (S2S) forecasting: UFS-Aerosols UFS-Chem.  The model is planned be implemented into Global Ensemble (GEFS) v13.0 in 2026, incorporates NASA’s 2nd-generation GOCART within a National Operational Prediction Capability (NUOPC)...
Abstract Fire activities introduce hazardous impacts on the environment and public health by emitting various chemical species into atmosphere. Most operational air quality forecast (AQF) models estimate smoke emissions based latest available satellite fire products, which may not represent real‐time behaviors without considering spread. Hence, a novel machine learning (ML) spread model, Intensity spRead forecAst (FIRA), is developed for AQF model applications. FIRA aims to improve...
Abstract We examine the impact of El Niño–Southern Oscillation (ENSO) on surface ozone abundance observed over continental United States (U.S.) during 1993–2013. The monthly decreases (increases) Niño (La Niña) years with amplitude up to 1.8 ppb per standard deviation 3.4 index. largest ENSO influences occur two southern U.S. regions fall when develops and western winter spring after decays. affects via chemical processes warm seasons in regions, where favorable meteorological conditions...