A5044709693- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Climate variability and models
- Climate Change and Health Impacts
- COVID-19 impact on air quality
- Meteorological Phenomena and Simulations
- Ocean Acidification Effects and Responses
- Tropical and Extratropical Cyclones Research
- Space Exploration and Technology
- Ionosphere and magnetosphere dynamics
- Spaceflight effects on biology
- Space exploration and regulation
- Impact of Light on Environment and Health
- Marine and fisheries research
- Spacecraft Design and Technology
- Solar and Space Plasma Dynamics
- Carbon Dioxide Capture Technologies
- Energy, Environment, and Transportation Policies
- Aerospace Engineering and Energy Systems
- Forecasting Techniques and Applications
- Energy, Environment, Economic Growth
Goddard Space Flight Center
2017-2025
Morgan State University
2021-2025
Sonoma Technology (United States)
2024
Science Systems and Applications (United States)
2024
Universities Space Research Association
2017-2023
University of Edinburgh
2015
McGill University
2010
The Goddard Earth Observing System composition forecast (GEOS-CF) system is a high-resolution (0.25°) global constituent prediction from NASA's Global Modeling and Assimilation Office (GMAO). GEOS-CF offers new tool for atmospheric chemistry research, with the goal to supplement broad range of space-based in-situ observations. expands on GEOS weather aerosol modeling by introducing GEOS-Chem module provide hindcasts 5-days forecasts constituents including ozone (O
Abstract. Social distancing to combat the COVID-19 pandemic has led widespread reductions in air pollutant emissions. Quantifying these changes requires a business-as-usual counterfactual that accounts for synoptic and seasonal variability of pollutants. We use machine learning algorithm driven by information from NASA GEOS-CF model assess nitrogen dioxide (NO2) ozone (O3) at 5756 observation sites 46 countries January through June 2020. Reductions NO2 coincide with timing intensity...
1998-2016 ozone trends in the lower stratosphere (LS) are examined using Modern-Era Retrospective Analysis for Research and Applications Version 2 (MERRA-2) related NASA products. After removing biases resulting from step-changes MERRA-2 observations, a discernible negative trend of -1.67±0.54 Dobson units per decade (DU/decade) is found 10-km layer above tropopause between 20°N 60°N. A weaker but statistically significant -1.17±0.33 DU/decade exists 50°S 20°S. In Tropics, positive seen 5-km...
Biomass burning from wildfires is a significant global source of aerosol and trace gases which impact air quality, tropospheric stratospheric composition, climate. During the summer 2019, wildfire activity in central eastern Siberia occurred during Fire Influence on Regional to Global Environments Air Quality (FIREX-AQ) campaign conducted United States between July 24 September 6, 2019. Ground-based lidar observations Autonomous Mobile Ozone Lidar for Tropospheric Experiments (AMOLITE)...
Stratospheric intrusions have been the interest of decades research for their ability to bring stratospheric ozone (O
Forecasting ambient PM2.5 concentrations with spatiotemporal coverage is key to alerting decision makers of pollution episodes and preventing detrimental public exposure, especially in regions limited ground air monitoring stations. The existing methods rely on either chemical transport models (CTMs) forecast spatial distribution nontrivial uncertainty or statistical algorithms concentration time series at locations without continuous coverage. In this study, we developed a framework by...
Abstract Tropospheric ozone is an air pollutant and a greenhouse gas whose anthropogenic production limited principally by the supply of nitrogen oxides (NO x ) from combustion. in northern hemisphere has been rising despite flattening NO emissions recent decades. Here we propose that this sustained increase could result photolysis nitrate particles (pNO 3 − to regenerate . Including pNO GEOS‐Chem atmospheric chemistry model improves consistency with observations. Our simulations show...
The NASA Goddard Earth Observing System (GEOS) Composition Forecast (GEOS-CF) provides recent estimates and 5-day forecasts of atmospheric composition to the public in near-real time. To do this, GEOS system model is coupled with GEOS-Chem tropospheric-stratospheric unified chemistry extension (UCX) represent from surface top atmosphere (0.01 hPa). GEOS-CF described, including updates made UCX mechanism within for improved representation stratospheric chemistry. Comparisons are against...
The Single Field of View (SFOV) ozone (O3) profiles derived from the Cross-track Infrared Sounder (CrIS) onboard Suomi National Polar-Orbiting Partnership (SNPP), with a high horizontal resolution approximately 14 km at nadir and good sensitivity to O3 in upper troposphere lower stratosphere (UTLS), provide prominent opportunity examine (STT) transport. A process-oriented analysis was performed fine-scale features stratospheric intrusion (SI) event on June 11–13, 2017 southwestern US using...
Abstract. We present a new method to infer emissions and lifetimes of nitrogen oxides (NOx) based on tropospheric dioxide (NO2) observations together with reanalysis wind fields for cities located in polluted backgrounds. Since the accuracy is difficult assess due lack “true values” that can be used as benchmark, we apply synthetic NO2 derived from NASA-Unified Weather Research Forecasting (NU-WRF) model at high horizontal spatial resolution 4 km × over continental United States. compare...
Abstract. Satellite-derived spatiotemporal patterns of nitrogen oxide (NOx) emissions can improve accuracy emission inventories to better support air quality and climate research policy studies. In this study, we develop a new method by coupling the chemical transport Model-Independent SATellite-derived Emission estimation Algorithm for Mixed-sources (MISATEAM) with divergence map high-resolution NOx across US cities using TROPOspheric Monitoring Instrument (TROPOMI) tropospheric dioxide...
The effect of sea breeze circulation on stratification the vertical formaldehyde (HCHO) concentration profiles is explored using a regional atmospheric chemical transport model (CTM) for three synoptically stagnant days focused east coast U.S in June 2018. During this event, significant thermal contrast between Atlantic Ocean and terrestrial regions (12–17 °C), observed by moderate resolution imaging spectroradiometer (MODIS) well-captured WRF-CMAQ (15–18 conducive to monsoon-like flow,...
Abstract This Algorithm Theoretical Basis Document (ATBD) describes the retrieval algorithm and sensitivities of Version 3 cloud product derived from spectra collected by Tropospheric Emissions: Monitoring POllution (TEMPO) instrument. The is primarily produced for supporting retrievals TEMPO trace gases that are important understanding atmospheric chemistry monitoring air pollution. adapted NASA's Ozone Instrument (OMI) oxygen collision complex (O 2 ‐O ) algorithm. generates effective...
We present the status of Tropospheric Emissions: Monitoring Pollution (TEMPO) nitrogen dioxide (NO2) and formaldehyde (HCHO) retrievals one year after their public release. After multiple version updates, TEMPO Level 2 NO2 HCHO products have undergone significant enhancements to improve performance accuracy slant column retrievals, air mass factor calculations post-processing corrections. Upcoming 4 will include improved destriping for background illustrate both evaluating fitting...
Abstract. Social-distancing to combat the COVID-19 pandemic has led widespread reductions in air pollutant emissions. Quantifying these changes requires a business as usual counterfactual that accounts for synoptic and seasonal variability of pollutants. We use machine learning algorithm driven by information from NASA GEOS-CF model assess nitrogen dioxide (NO2) ozone (O3) at 5756 observation sites 46 countries January through June 2020. Reductions NO2 correlate with timing intensity...
Abstract The MERRA‐2 Stratospheric Composition Reanalysis of Aura Microwave Limb Sounder (M2‐SCREAM) is a new reanalysis stratospheric ozone, water vapor, hydrogen chloride (HCl), nitric acid (HNO 3 ) and nitrous oxide (N 2 O) between 2004 the present (with latency several months). assimilated fields are provided at 50‐km horizontal resolution three‐hourly frequency. M2‐SCREAM assimilates version 4.2 (MLS) profiles five constituents alongside total ozone column from Ozone Monitoring...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Journal of Advances in Modeling Systems (JAMES). ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Description NASA GEOS Composition Forecast System GEOS-CF v1.0AuthorsChristoph A.KelleriDK. EmmaKnowlandBryan NDuncanJunhuaLiuDaniel...
Abstract. The relationship between springtime air pollution transport of ozone (O3) and carbon monoxide (CO) mid-latitude cyclones is explored for the first time using Monitoring Atmospheric Composition Climate (MACC) reanalysis period 2003–2012. In this study, most intense spring storms (95th percentile) are selected two regions, North Pacific (NP) Atlantic (NA). These (∼60 over each region) often track major emission sources East Asia eastern America. By compositing storms, distributions...
Tropospheric ozone (O 3 ) negatively impacts human health and is also a greenhouse gas.
A cold air outbreak (CAO) is an extreme weather phenomenon that has significant social and economic impacts over a large region of the midlatitudes. However, dynamical mechanism occurrence evolution CAO events, particularly role stratosphere, not well understood. Through analysis one episode occurred on 27–31 January 2019 across much US Midwest, this study examined its thermodynamic structure impact stratospheric downward transport using single-field-view (SFOV) satellite products (with...
Abstract. The relationship between springtime mid-latitude cyclones and background ozone (O3) is explored using a combination of observational reanalysis data sets. First, the surface O3 observations at two rural monitoring sites on west coast Europe – Mace Head, Ireland, Monte Velho, Portugal cyclone track frequency in surrounding regions examined. Second, detailed case study examination four individual influence associated frontal passage performed. Cyclone tracks have greater measurements...