A5031708324- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Spectroscopy and Laser Applications
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Meteorological Phenomena and Simulations
- GNSS positioning and interference
- Inertial Sensor and Navigation
- Target Tracking and Data Fusion in Sensor Networks
- Geochemistry and Geologic Mapping
- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Calibration and Measurement Techniques
- Structural Health Monitoring Techniques
- Advanced Adaptive Filtering Techniques
- Advancements in Solid Oxide Fuel Cells
- Soil Moisture and Remote Sensing
- Drilling and Well Engineering
- Reservoir Engineering and Simulation Methods
- Air Quality Monitoring and Forecasting
- Radiation Dose and Imaging
- Fire effects on ecosystems
- Advanced Chemical Sensor Technologies
- Advanced X-ray and CT Imaging
Environmental Defense Fund
2023-2025
Center for Astrophysics Harvard & Smithsonian
2023-2024
Harvard University Press
2024
Airbus (France)
2020-2024
Harvard University
2022-2024
University of Toronto
2016-2023
Canada Research Chairs
2021
Environment and Climate Change Canada
2021
Schlumberger (British Virgin Islands)
2020
Centre d'Etudes et de Recherches Appliquées à la Gestion
2015
Abstract. The Sentinel-5 Precursor (S5P) mission with the TROPOspheric Monitoring Instrument (TROPOMI) on board has been measuring solar radiation backscattered by Earth's atmosphere and surface since its launch 13 October 2017. In this paper, we present for first time S5P operational methane (CH4) carbon monoxide (CO) products' validation results covering a period of about 3 years using global Total Carbon Column Observing Network (TCCON) Infrared Working Group Detection Atmospheric...
Abstract. The Total Carbon Column Observing Network (TCCON) measures column-average mole fractions of several greenhouse gases (GHGs) beginning in 2004 from over 30 current or past measurement sites around the world, using solar absorption spectroscopy near infrared region. TCCON GHG data have been used extensively for multiple purposes, including studies carbon cycle and anthropogenic emissions as well to validate improve observations made spacebased sensors. Here, we describe an update...
Abstract. The Total Carbon Column Observing Network (TCCON) measures column-average mole fractions of several greenhouse gases (GHGs), beginning in 2004, from over 30 current or past measurement sites around the world using solar absorption spectroscopy near-infrared (near-IR) region. TCCON GHG data have been used extensively for multiple purposes, including studies carbon cycle and anthropogenic emissions, as well to validate improve observations space-based sensors. Here, we describe an...
Abstract. Carbon monoxide (CO) is an important atmospheric constituent affecting air quality, and methane (CH4) the second most greenhouse gas contributing to human-induced climate change. Detailed continuous observations of these gases are necessary better assess their impact on pollution. While surface airborne measurements able accurately determine abundances local scales, global coverage can only be achieved using satellite instruments. The TROPOspheric Monitoring Instrument (TROPOMI)...
Abstract. Optimal estimation retrievals of trace gas total columns require prior vertical profiles the gases retrieved to drive forward model and ensure retrieval problem is mathematically well posed. For well-mixed gases, it possible derive accurate using an algorithm that accounts for general patterns atmospheric transport coupled with measured time series in questions. Here we describe used generate GGG2020, a new version GGG analyze spectra from solar-viewing Fourier transform...
Abstract. Observations of carbon monoxide (CO) from the Measurements Of Pollution In The Troposphere (MOPITT) instrument aboard Terra spacecraft were expected to have an accuracy 10 % prior launch in 1999. Here we evaluate MOPITT Version 7 joint (V7J) thermal-infrared and near-infrared (TIR–NIR) retrieval precision suggest ways further improve observations. We take five steps involving filtering or bias corrections reduce scatter data relative other soundings ground-based measurements. (1)...
Abstract. EM27/SUN devices are portable solar-viewing Fourier transform spectrometers (FTSs) that being widely used to constrain measurements of greenhouse gas emissions and validate satellite trace measurements. On a 6-week-long campaign in the summer 2018, four were taken five Total Carbon Column Observing Network (TCCON) stations North America, measure side by side, better understand their durability, accuracy precision retrievals from measurements, site-to-site bias among TCCON sites. We...
Abstract. Reducing methane (CH4) emissions from the oil and gas (O&G) sector is crucial for mitigating climate change in near term. MethaneSAT an upcoming satellite mission designed to monitor basin-wide O&G globally, providing estimates of emission rates helping identify underlying processes leading release atmosphere. data will support advocacy policy efforts by track reduction commitments targets set countries industries. Here, we introduce a CH4 retrieval algorithm based...
Abstract. Satellite retrievals of column-averaged dry-air mole fractions carbon dioxide (CO2) and methane (CH4), denoted XCO2 XCH4, respectively, have been used in recent years to obtain information on natural anthropogenic sources sinks for other applications such as comparisons with climate models. Here we present new data sets based merging several individual satellite products order generate consistent long-term records (CDRs) these two Essential Climate Variables (ECVs). These ECV CDRs,...
Abstract. The MethaneSAT satellite instrument and its aircraft precursor, MethaneAIR, are imaging spectrometers designed to measure methane concentrations with wide spatial coverage, fine resolution, high precision compared currently deployed remote sensing instruments. At 12 960 m cruise altitude above ground (13 850 sea level), MethaneAIR datasets have a 4.5 km swath gridded 10 × pixels 17–20 ppb standard deviation on flat scene. was in the summer of 2021 Permian Basin test accuracy...
Abstract Two cavity ring‐down spectrometers were employed to accurately measure line intensities in a series of near‐infrared carbon dioxide bands including (30012) ← (00001), (30013) and (30014) (00001) near 1.6 μm. Relative combined standard uncertainties for these band less than 0.1% showed significant, percent‐level deviations with respect many existing spectroscopic databases (although close agreement was observed the HITRAN 2016 database bands). Further, resulting utilized Total Carbon...
Abstract. We evaluate vertical profile retrievals of CO2 from 0.02 cm−1 resolution ground-based near-infrared solar absorption spectra with the GFIT2 algorithm, using improved spectroscopic line lists and shapes. With these improvements, profiles were obtained sequential in five spectral windows different sensitivities synthetic real spectra. A sensitivity study shows that leading source uncertainty retrieved is error a priori temperature profile, even 3-hourly reanalysis profiles. 2 ∘C...
Abstract. The MethaneSAT satellite instrument and its aircraft precursor, MethaneAIR, are imaging spectrometers designed to measure methane concentrations with wide spatial coverage, fine resolution, high precision compared currently deployed remote sensing instruments. At 12960 m cruise altitude above ground (13850 sea level), MethaneAIR datasets have a 4.5 km swath gridded 10m x pixels 17–20 ppb standard deviation on flat scene. It was in the summer of 2021 Permian Basin test accuracy...
The Arctic and boreal regions are experiencing a rapid increase in temperature, resulting changing cryosphere, increasing human activity, potentially high-latitude methane emissions. Satellite observations from Sentinel-5P TROPOMI provide an unprecedented coverage of column-averaged dry-air mole fraction (XCH4) the Arctic, compared to previous missions or situ measurements. purpose this study is support enhance data used for research through presenting systematic evaluation products derived...
MethaneSAT is a satellite that observes the total column dry-air mole fraction of methane (XCH4) at high spatial resolution (100 m x 400 m) and precision (20 - 40 ppb) over target areas 200 km km. Its observations uniquely enable simultaneous quantification discrete point dispersed area sources within single scene, addressing critical gap in space-based monitoring. The mission focuses on characterizing emissions from oil gas industry, targeting 80% sector’s global emissions.We...
Abstract. We characterize the magnitude of seasonally and spatially varying biases in National Aeronautics Space Administration (NASA) Orbiting Carbon Observatory-2 (OCO-2) Version 8 (v8) Atmospheric CO2 Observations from (ACOS) Greenhouse Gas Observing SATellite (GOSAT) version 7.3 (v7.3) satellite retrievals by comparisons to measurements collected Total Column Network (TCCON), Tomography (ATom) experiment, Oceanic (NOAA) Earth System Research Laboratory (ESRL) U. S. Department Energy...
AIM-North is a proposed satellite mission that would provide observations of unprecedented frequency and density for monitoring northern greenhouse gases (GHGs), air quality (AQ) vegetation. consist two satellites in highly elliptical orbit formation, observing over land from ∼40°N to 80°N multiple times per day. Each carry near-infrared shortwave infrared imaging spectrometer CO2, CH4, CO, an ultraviolet-visible quality. Both instruments measure solar-induced fluorescence A cloud imager...
Abstract. Optimal estimation retrievals of trace gas total columns require prior vertical profiles the gases retrieved to drive forward model and ensure retrieval problem is mathematically well-posed. For well-mixed gases, it possible derive accurate using an algorithm that accounts for general patterns atmospheric transport coupled with measured time series in questions. Here we describe used generate GGG2020, a new version GGG analyze spectra from solar-viewing Fourier transform...
Abstract. A new model for greenhouse gas transport has been developed based on Environment and Climate Change Canada's operational weather environmental prediction models. When provided with realistic posterior fluxes CO2, the CO2 simulations compare well to NOAA's CarbonTracker fields near-surface continuous measurements, columns from Total Carbon Column Observing Network (TCCON) NOAA aircraft profiles. This coupled meteorological tracer is used study predictability of CO2. Predictability...
Abstract. The Sentinel-5 Precursor (S5P) mission with the TROPOspheric Monitoring Instrument (TROPOMI) onboard has been measuring solar radiation backscattered by Earth's atmosphere and its surface since launch on 13 October 2017. Methane (CH4) carbon monoxide (CO) data a spatial resolution (initially 7 x km2, upgraded to 5.5 km2 6th of August 2019) have retrieved from shortwave infrared (SWIR) near-infrared (NIR) measurements end November 2017 made available experts for early validation...
Model-based controllers can significantly improve the performance of Proton Exchange Membrane Fuel Cell (PEMFC) systems. However, complexity these strategies constraints large scale implementation. In this work, with a view to reduce without affecting performance, two different modeling approaches single-cell PEMFC are investigated. A mechanistic model, describing all internal phenomena in single-cell, and an artificial neural network (ANN) model tested. To perform databases measured on...
Abstract. Nineteen years of atmospheric composition measurements made at the University Toronto Atmospheric Observatory (TAO; 43.66∘ N, 79.40∘ W; 174 m a.s.l.) are presented. These retrieved from Fourier transform infrared (FTIR) solar absorption spectra recorded with an ABB Bomem DA8 spectrometer May 2002 to December 2020. The retrievals have been performed for 14 species: O3, HCl, HF, HNO3, CH4, C2H6, CO, HCN, N2O, C2H2, H2CO, CH3OH, HCOOH, and NH3 using SFIT4 algorithm. archived in...
Abstract. This work presents the development of MethaneAIR Level0–Level1B processor, which converts raw L0 data to calibrated and georeferenced L1B data. is airborne simulator for MethaneSAT, a new satellite under by MethaneSAT LLC, subsidiary Environmental Defense Fund (EDF). MethaneSAT's goals are precisely map over 80 % production sources methane from oil gas fields across globe an accuracy 2–4 ppb on 2 km2 scale. Efficient algorithms have been developed perform dark corrections, estimate...
Abstract Total columns of C 2 H , 6 CH 4 3 OH, CO, HCl, HCN, HCOOH, HF, HNO N O, NH and O were retrieved from 2002-2019 using a Fourier transform infrared (FTIR) spectrometer at the University Toronto Atmospheric Observatory (TAO). Trends enhancement events determined by fitting trended series, bootstrapping was used to identify statistical significance. 2002 2019 (%/year, with σ uncertainties) found for (−1.12 ± 0.30), (−0.74 0.73 2002–2008 1.19 0.27 2009–2019), (0.26 0.10 0.41 0.03 CO...