A5032518822- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Spectroscopy and Laser Applications
- Calibration and Measurement Techniques
- Water Quality Monitoring and Analysis
- Ionosphere and magnetosphere dynamics
- Vehicle emissions and performance
- Solar and Space Plasma Dynamics
- COVID-19 impact on air quality
- Gas Dynamics and Kinetic Theory
- Atmospheric aerosols and clouds
- Geophysics and Gravity Measurements
- Ocean Acidification Effects and Responses
- Aerospace Engineering and Energy Systems
- Astronomical Observations and Instrumentation
- Meteorological Phenomena and Simulations
- Climate Change and Health Impacts
- Nuclear Physics and Applications
- Geochemistry and Geologic Mapping
- Advanced Chemical Sensor Technologies
- Satellite Image Processing and Photogrammetry
- Mercury impact and mitigation studies
Center for Astrophysics Harvard & Smithsonian
2016-2025
Smithsonian Astrophysical Observatory
2025
University at Buffalo, State University of New York
2024
Harvard University Press
2016
Dalhousie University
2013-2014
University of Toronto
2003-2009
University of Waterloo
2006
SCISAT‐1, also known as the Atmospheric Chemistry Experiment (ACE), is a Canadian satellite mission for remote sensing of Earth's atmosphere. It was launched into low Earth circular orbit (altitude 650 km, inclination 74°) on 12 Aug. 2003. The primary ACE instrument high spectral resolution (0.02 cm −1 ) Fourier Transform Spectrometer (FTS) operating from 2.2 to 13.3 μm (750–4400 ). features dual spectrophotometer MAESTRO with wavelength coverage 285–1030 nm and 1–2 nm. A pair filtered CMOS...
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. Airborne and ground-based Pandora spectrometer NO2 column measurements were collected during the 2018 Long Island Sound Tropospheric Ozone Study (LISTOS) in New York City/Long region, which coincided with early observations from Sentinel-5P TROPOspheric Monitoring Instrument (TROPOMI) instrument. Both airborne- are used to evaluate TROPOMI Vertical Column (TrVC) product v1.2 this has high spatial temporal heterogeneity NO2. First, airborne TrVCs compared uncertainty of TrVC...
Abstract. This paper presents extensive {bias determination} analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: ACE Fourier Transform Spectrometer (ACE-FTS) and Measurement Aerosol Extinction in Stratosphere Troposphere Retrieved by Occultation (ACE-MAESTRO) instrument. Here we compare latest data products ACE-FTS ACE-MAESTRO with coincident nearly 20 satellite-borne, airborne, balloon-borne ground-based instruments, analysing volume mixing...
Abstract Retrievals of sulfur dioxide (SO 2 ) from space‐based spectrometers are in a relatively early stage development. Factors such as interference between ozone and SO the retrieval algorithms often lead to errors retrieved values. Measurements Ozone Monitoring Instrument (OMI), Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY), Global Experiment‐2 (GOME‐2) satellite sensors, averaged over period several years, were used identify locations with elevated...
Abstract. The Geostationary Trace gas and Aerosol Sensor Optimization (GeoTASO) airborne instrument is a test bed for upcoming air quality satellite instruments that will measure backscattered ultraviolet, visible near-infrared light from geostationary orbit. GeoTASO flew on the NASA Falcon aircraft in its first intensive field measurement campaign during Deriving Information Surface Conditions Column Vertically Resolved Observations Relevant to Air Quality (DISCOVER-AQ) Earth Venture...
Houston, Texas is a major U.S. urban and industrial area where poor air quality unevenly distributed disproportionate share located in low-income, non-white, Hispanic neighborhoods. We have traditionally lacked city-wide observations to fully describe these spatial heterogeneities Houston cities globally, especially for reactive gases like nitrogen dioxide (NO2). Here, we analyze novel high-spatial-resolution (250 m × 500 m) NO2 vertical columns measured by the NASA GCAS airborne...
Abstract This study presents the ozone monitoring instrument (OMI) Collection 4 formaldehyde (HCHO) retrieval developed with Smithsonian Astrophysical Observatory's (SAO) Making Earth System Data Records for Use in Research Environments (MEaSUREs) algorithm. The algorithm updates and makes improvements to NASA operational OMI HCHO (OMI 3 HCHO) algorithm, has been transitioned use Level‐1B radiances. paper describes updated compares data products. exhibits remarkably improved stability over...
The Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (MAESTRO) instrument on SCISAT satellite is a simple, compact spectrophotometer for measurement atmospheric extinction, ozone, nitrogen dioxide, other trace gases stratosphere upper troposphere as part Atmospheric Chemistry Experiment (ACE) mission. We provide an overview from requirements to realization, including optical design, prelaunch on-orbit performance, preliminary examination...
[1] We apply an optimal estimation algorithm originally developed for retrieving ozone profiles from the Global Ozone Monitoring Experiment (GOME) and Instrument (OMI) to make global observations of sulfur dioxide 2 (GOME-2) on MetOp-A satellite. Our approach combines a full radiative transfer calculation, retrieval algorithm, trace gas climatologies implicitly include effects albedo, clouds, ozone, SO2 in retrieval. Under volcanic conditions, may also be used directly retrieve plume...
A method is developed to estimate global NO2 and SO2 dry deposition fluxes at high spatial resolution (0.1°×0.1°) using satellite measurements from the Ozone Monitoring Instrument (OMI) on Aura satellite, in combination with simulations Goddard Earth Observing System chemical transport model (GEOS-Chem). These maps for 2005–2007 provide a data set use examining regional budgets of deposition. In order properly assess scale, account geospatial character background offsets retrieved columns....
We present an assessment study of the Global Ozone Monitoring Experiment 2 (GOME‐2) reflectance for wavelength range 270–350 nm by comparing measurements with simulations calculated using vector linearized discrete ordinate radiative transfer model (VLIDORT) and Microwave Limb Sounder (MLS) ozone profiles. The results indicate wavelength‐ cross‐track‐position‐dependent biases. GOME‐2 is overestimated 10% near 300 15%–20% around 270 nm. Stokes fraction made onboard polarization measurement...
Abstract. The GEOstationary Coastal and Air Pollution Events (GEO-CAPE) Airborne Simulator (GCAS) was developed in support of NASA's decadal survey GEO-CAPE geostationary satellite mission. GCAS is an airborne push-broom remote-sensing instrument, consisting two channels which make hyperspectral measurements the ultraviolet/visible (optimized for air quality observations) visible–near infrared ocean color observations). instrument participated its first intensive field campaign during...
Over the last five decades, Earth's atmosphere has been extensively monitored from space using different spectral ranges. Early efforts were directed at improving weather forecasts with first meteorological satellites launched in 1960s. Soon thereafter, intersection between weather, climate and atmospheric chemistry led to observation of composition space. During 1970s Nimbus satellite program started regular monitoring ozone integrated columns water vapor profiles Backscatter Ultraviolet...
Abstract. The absence of up-to-date emissions has been a major impediment to accurately simulating aspects atmospheric chemistry and precisely quantifying the impact changes in on air pollution. Hence, nonlinear joint analytical inversion (Gauss–Newton method) both volatile organic compounds (VOCs) nitrogen oxide (NOx) is made by exploiting Smithsonian Astrophysical Observatory (SAO) Ozone Mapping Profiler Suite Nadir Mapper (OMPS-NM) formaldehyde (HCHO) National Aeronautics Space...
Nonmethane volatile organic compounds (NMVOCs) result in ozone and aerosol production that adversely affects the environment human health. For modeling purposes, anthropogenic NMVOC emissions have been typically compiled using “bottom-up” approach. To minimize uncertainties of bottom-up emission inventory, “top-down” can be estimated formaldehyde (HCHO) observations. In this study, HCHO vertical column densities (VCDs) obtained from Geostationary Trace gas Aerosol Sensor Optimization...
Questions about how emissions are changing during the COVID-19 lockdown periods cannot be answered by observations of atmospheric trace gas concentrations alone, in part due to simultaneous changes transport, emissions, dynamics, photochemistry, and chemical feedback. A transport model simulation benefiting from a multi-species inversion framework using well-characterized should differentiate those influences enabling closely examine emissions. Accordingly, we jointly constrain NO x VOC...
We aim to reduce uncertainties in CH2O and other volatile organic carbon (VOC) emissions through assimilation of remote sensing data. first update a three-dimensional (3D) chemical transport model, GEOS-Chem with the KORUSv5 anthropogenic emission inventory inclusion chemistry for aromatics C2H4, leading modest improvements simulation (normalized mean bias (NMB): -0.57 -0.51) O3 (NMB: -0.25 -0.19) compared against DC-8 aircraft measurements during KORUS-AQ; mixing ratio most VOC species are...
Abstract The COVID-19 stay-at-home orders issued in the United States caused significant reductions traffic and economic activities. To understand pandemic's perturbations on US emissions impacts urban air quality, we developed near-real-time bottom-up emission inventories based publicly available energy datasets, simulated changes a chemical transport model, evaluated quality against various observations. pandemic affected across broad-based sectors persisted to 2021. Compared with 2019...
Abstract We validate formaldehyde (HCHO) vertical column densities (VCDs) from Ozone Mapping and Profiler Suite Nadir Mapper (OMPS‐NM) instruments onboard the Suomi National Polar‐orbiting Partnership (Suomi NPP) satellite for 2012–2020 Oceanic Atmospheric Administration‐20 (NOAA‐20) 2018–2020, hereafter referred to as OMPS‐NPP OMPS‐N20, with ground‐based Fourier‐Transform Infrared (FTIR) observations of Network Detection Composition Change (NDACC). OMPS‐NPP/N20 HCHO products reproduce...
Abstract. Vertical profiles of NO2 and NO have been obtained from solar occultation measurements by the Atmospheric Chemistry Experiment (ACE), using an infrared Fourier Transform Spectrometer (ACE-FTS) (for NO2) ultraviolet-visible-near-infrared spectrometer, MAESTRO (Measurement Aerosol Extinction in Stratosphere Troposphere Retrieved Occultation). In this paper, quality ACE-FTS version 2.2 1.2 data are assessed other (HALOE, SAGE II, III, POAM SCIAMACHY), stellar (GOMOS), limb (MIPAS,...
The NASA ESTO-funded Geostationary Trace gas and Aerosol Sensor Optimization (GeoTASO) development project demonstrates a reconfigurable multi-order airborne spectrometer tests the performance of spectra separation filtering on sensor spectral measurements subsequent trace aerosol retrievals. activities support mission risk reduction for UV-Visible air quality from geostationary orbit TEMPO GEMS missions1 . helps advance retrieval algorithm readiness through using scene data taken with...