A5042983625- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Climate Change and Health Impacts
- Atmospheric aerosols and clouds
- COVID-19 impact on air quality
- Water Quality Monitoring and Analysis
- Calibration and Measurement Techniques
- Vehicle emissions and performance
- Marine and coastal ecosystems
- Fire effects on ecosystems
- Spectroscopy and Laser Applications
- Remote Sensing in Agriculture
- Ionosphere and magnetosphere dynamics
- Oil, Gas, and Environmental Issues
- Impact of Light on Environment and Health
- Maritime Transport Emissions and Efficiency
- Spacecraft and Cryogenic Technologies
- Geochemistry and Geologic Mapping
- Analytical Chemistry and Sensors
- Satellite Image Processing and Photogrammetry
- Odor and Emission Control Technologies
- Remote-Sensing Image Classification
Goddard Space Flight Center
2015-2024
Universities Space Research Association
2015-2024
University of Maryland, Baltimore County
2022-2024
George Washington University
2020
Pokhara University
2017
Dalhousie University
2007-2012
University of Bremen
2004-2007
Abstract. The Ozone Monitoring Instrument (OMI) onboard NASA's Aura satellite has been providing global observations of the ozone layer and key atmospheric pollutant gases, such as nitrogen dioxide (NO2) sulfur (SO2), since October 2004. data products from same instrument provide consistent spatial temporal coverage permit study anthropogenic natural emissions on local-to-global scales. In this paper, we examine changes in SO2 NO2 over some world's most polluted industrialized regions during...
Abstract. This overview paper highlights the successes of Ozone Monitoring Instrument (OMI) on board Aura satellite spanning a period nearly 14 years. Data from OMI has been used in wide range applications and research resulting many new findings. Due to its unprecedented spatial resolution, combination with daily global coverage, plays unique role measuring trace gases important for ozone layer, air quality, climate change. With operational very fast delivery (VFD; direct readout) near...
Abstract Nitrogen oxides (NO x = NO + 2 ) are produced during combustion processes and, thus may serve as a proxy for fossil fuel‐based energy usage and coemitted greenhouse gases other pollutants. We use high‐resolution nitrogen dioxide data from the Ozone Monitoring Instrument (OMI) to analyze changes in urban levels around world 2005 2014, finding complex heterogeneity changes. discuss several potential factors that seem determine these First, environmental regulations resulted large...
We present an approach to infer ground‐level nitrogen dioxide (NO 2 ) concentrations by applying local scaling factors from a global three‐dimensional model (GEOS‐Chem) tropospheric NO columns retrieved the Ozone Monitoring Instrument (OMI) onboard Aura satellite. Seasonal mean OMI surface derived standard data product (Version 1.0.5, Collection 3) varies more than two orders of magnitude (<0.1–>10 ppbv) over North America. Two ground‐based sets are used validate estimate and...
TROPOMI, on-board the Sentinel-5 Precursor satellite is a nadir-viewing spectrometer measuring reflected sunlight in ultraviolet, visible, near-infrared, and shortwave infrared spectral range. From these spectra several important air quality climate-related atmospheric constituents are retrieved at an unprecedented high spatial resolution, including nitrogen dioxide (NO2). We present first retrievals of TROPOMI NO2 over Canadian Oil Sands, contrasting them with observations from OMI...
Abstract. We describe a new algorithm for the retrieval of nitrogen dioxide (NO2) vertical columns from nadir-viewing satellite instruments. This (SP2) is basis Version 2.1 OMI Ozone Monitoring Instrument (OMI) NO2 Standard Product and features novel method separating stratospheric tropospheric columns. The approach estimates directly data without using chemical transport models or assuming any global zonal wave pattern. Tropospheric are retrieved air mass factors derived high-resolution...
China's policy interventions to reduce the spread of coronavirus disease 2019 have environmental and economic impacts. Tropospheric nitrogen dioxide indicates activities, as is primarily emitted from fossil fuel consumption. Satellite measurements show a 48% drop in tropospheric vertical column densities 20 days averaged before 2020 Lunar New Year after. This decline 21 ± 5% larger than that 2015 2019. We relate this reduction two government's actions: announcement first report each province...
[1] Anthropogenic emissions of nitrogen oxides (NOx) can change rapidly due to economic growth or control measures. Bottom-up estimated using source-specific emission factors and activity statistics require years compile become quickly outdated. We present a method use satellite observations tropospheric NO2 columns estimate changes in NOx emissions. retrieved from the SCIAMACHY instrument for 2003–2009, response determined global chemical transport model (GEOS-Chem), bottom-up anthropogenic...
We examine the seasonal variation in lower tropospheric nitrogen oxides (NO x = NO + 2 ) at northern midlatitudes by evaluating columns observed from Ozone Monitoring Instrument (OMI) satellite instrument with surface measurements (SouthEastern Aerosol Research and Characterization Air Quality System) current bottom‐up emission inventories, using a global model of chemistry (GEOS‐Chem). The standard (SP) DOMINO (DP) column products OMI exhibit broadly similar spatial variation, but differ...
Asthma is the most prevalent chronic respiratory disease worldwide, affecting 358 million people in 2015. Ambient air pollution exacerbates asthma among populations around world and may also contribute to new-onset asthma.We aimed estimate number of emergency room visits new onset cases globally attributable fine particulate matter ([Formula: see text]), ozone, nitrogen dioxide text]) concentrations.We used epidemiological health impact functions combined with data describing population,...
Determining effective strategies for mitigating surface ozone (O
Emissions of nitrogen oxides (NOx) and, subsequently, atmospheric levels dioxide (NO2) have decreased over the U.S. due to a combination environmental policies and technological change. Consequently, NO2 by 30–40% in last decade. We quantify trends (2005–2013) using surface measurements from Environmental Protection Agency (EPA) Air Quality System (AQS) an improved tropospheric vertical column density (VCD) data product Ozone Monitoring Instrument (OMI) on Aura satellite. demonstrate that...
Abstract. We describe the new version 3.0 NASA Ozone Monitoring Instrument (OMI) standard nitrogen dioxide (NO2) products (SPv3). The and documentation are publicly available from Goddard Earth Sciences Data Information Services Center (https://disc.gsfc.nasa.gov/datasets/OMNO2_V003/summary/). major improvements include (1) a spectral fitting algorithm for NO2 slant column density (SCD) retrieval (2) higher-resolution (1° latitude 1.25° longitude) priori temperature profiles Global Modeling...
Background: Population exposure assessment methods that capture local-scale pollutant variability are needed for large-scale epidemiological studies and surveillance, policy, regulatory purposes. Currently, such limited.Methods: We created 2006 national models fine particulate matter [PM with aerodynamic diameter ≤ 2.5 μm (PM2.5)], nitrogen dioxide (NO2), benzene, ethylbenzene, 1,3-butadiene from routinely collected fixed-site monitoring data in Canada. In multiple regression models, we...
Abstract. We assess the standard operational nitrogen dioxide (NO2) data product (OMNO2, version 2.1) retrieved from Ozone Monitoring Instrument (OMI) onboard NASA's Aura satellite using a combination of aircraft and surface in~situ measurements as well ground-based column at several locations bottom-up NOx emission inventory over continental US. Despite considerable sampling differences, NO2 vertical densities OMI are modestly correlated (r = 0.3–0.8) with in situ tropospheric aircraft,...
Satellite data of atmospheric pollutants are becoming more widely used in the decision-making and environmental management activities public, private sector non-profit organizations. They employed for estimating emissions, tracking pollutant plumes, supporting air quality forecasting activities, providing evidence "exceptional event" declarations, monitoring regional long-term trends, evaluating model output. However, many managers not taking full advantage these applications nor has...
Abstract. Air mass factor (AMF) calculation is the largest source of uncertainty in NO2 and HCHO satellite retrievals situations with enhanced trace gas concentrations lower troposphere. Structural arises when different retrieval methodologies are applied within scientific community to same observations. Here, we address issue AMF structural via a detailed comparison methods that structurally between seven groups for measurements from Ozone Monitoring Instrument (OMI). We estimate escalation...
Concern is growing about the effects of urbanization on air pollution and health. Nitrogen dioxide (NO2) released primarily from combustion processes, such as traffic, a short-lived atmospheric pollutant that serves an air-quality indicator itself health concern. We derive global distribution ground-level NO2 concentrations tropospheric columns retrieved Ozone Monitoring Instrument (OMI). Local scaling factors three-dimensional chemistry-transport model (GEOS-Chem) are used to relate OMI...
The TROPOspheric Monitoring Instrument (TROPOMI) is used to derive top-down NOX emissions for two large power plants and three megacities in North America. We first re-process the vertical column NO2 with an improved air mass factor correct a known systematic low bias operational retrieval near urban centers. For plants, agree within 10% of reported by plants. then rates New York City, Chicago, Toronto, compare them projected bottom-up inventories. In this analysis 2018 emissions, we find...
Abstract Nitrogen dioxide (NO 2 ) is an important contributor to air pollution and can adversely affect human health 1–9 . A decrease in NO concentrations has been reported as a result of lockdown measures reduce the spread COVID-19 10–20 Questions remain, however, regarding relationship satellite-derived atmospheric column data with health-relevant ambient ground-level concentrations, representativeness limited ground-based monitoring for global assessment. Here we derive spatially...