A5037263024- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Spectroscopy and Laser Applications
- Astro and Planetary Science
- Water Quality Monitoring and Analysis
- Space Exploration and Technology
- Planetary Science and Exploration
- Analytical Chemistry and Sensors
- Air Quality Monitoring and Forecasting
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Geochemistry and Geologic Mapping
University of Toronto
2019-2024
Canada Research Chairs
2021
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 In the winter and spring of 2019/2020, unusually cold, strong, stable polar vortex created favorable conditions for ozone depletion in Arctic. Chemical loss started earlier than any previous year satellite era continued until late March, resulting unprecedented reduction column. The was located above Polar Environment Atmospheric Research Laboratory Eureka, Canada (80°N, 86°W) from February to end April, presenting an excellent opportunity examine a single ground station....
Abstract Carbonyl sulfide (OCS) is a non‐hygroscopic trace species in the free troposphere and large sulfur reservoir maintained by both direct oceanic, geologic, biogenic, anthropogenic emissions oxidation of other sulfur‐containing source species. It largest transported to stratosphere during volcanically quiescent periods. Data from 22 ground‐based globally dispersed stations are used derive trends total partial column OCS. Middle infrared spectral data recorded solar‐viewing Fourier...
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 Extreme enhancements in the total columns of carbon monoxide (CO), peroxyacetyl nitrate (PAN), ethylene (C 2 H 4 ), methanol (CH 3 OH), and formic acid (HCOOH) were observed over Canadian high Arctic during period 17–22 August 2017 by a ground‐based Fourier transform infrared (FTIR) spectrometer at Eureka, Nunavut (80.05°N, 86.42°W), Infrared Atmospheric Sounding Interferometer (IASI) satellite instruments. These have been attributed to wildfires British Columbia (BC) Northwest...
Peroxyacetyl nitrate (PAN) is the main tropospheric reservoir of NOx (NO + NO2). Its lifetime can reach several months in upper cold troposphere. This enables long-range transport radicals, under form PAN, far from regions emission. The subsequent release through PAN thermal decomposition leads to efficient formation ozone (O3), with important consequences for oxidative capacity and air quality. chemical properties have stimulated progressive development remote-sensing products by satellite...
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...
Abstract Experimental measurements of collision‐induced absorption (CIA) cross sections for CO 2 ‐H and ‐CH 4 complexes were performed using Fourier transform spectroscopy over a spectral range 150–475 cm −1 temperature 200–300 K. These experimentally derived CIA agree with the calculation by Wordsworth et al. (2017) however, amplitude is half what was predicted. Furthermore, reported here those measured Turbet (2019, 2019). Additionally, radiative transfer calculations early Mars atmosphere...
Abstract. The TROPOspheric Monitoring Instrument (TROPOMI) provides a daily, spatially resolved (initially 7×7 km2, upgraded to 7×5.6 km2 in August 2019) global dataset of CO columns; however, due the relative sparseness reliable ground-based data sources, it can be challenging characterize validity and accuracy satellite products remote regions such as high Arctic. In these regions, intercomparisons supplement model- validation efforts serve verify previously observed differences. this...
Experimental measurements of collision-induced absorption (CIA) cross-sections for CO2-H2 and CO2-CH4 complexes were performed using Fourier transform spectroscopy over a spectral range 100-500 cm temperature 200-300 K. These experimentally derived CIA agree with the dependence calculation by \citeA{Robin}, however amplitude is half what was predicted. Furthermore, reported here those measured \citeA{Turbet}. The can be applied to planetary systems CO$_{2}$-rich atmospheres, such as Mars...
Abstract The long‐term trends and seasonality of many tropospheric pollutants are not well characterized in the high Arctic due to a dearth trace‐gas measurements this remote region. In study, inter‐ intra‐annual variabilities carbon monoxide (CO), acetylene (C 2 H ), ethane 6 methanol (CH 3 OH), formaldehyde (H CO), formic acid (HCOOH), peroxyacetyl nitrate (PAN) region were derived from total column time‐series ground‐based Fourier transform infrared (FTIR) at Eureka, Nunavut (80.05°N,...
Abstract HCFC‐22 is an ozone‐depleting substance with a greenhouse effect. The atmospheric mole fractions of have been increasing since the 1950s. Within NDACC‐IRWG network, mol can be retrieved from solar absorption spectra measured by ground‐based FTIR. However, only few sites provided data sets. Here, we demonstrate harmonized FTIR retrieval strategy and generate new global set at 16 sites. systematic random uncertainties are 5.3%–8.7% 3.2%–8.0%, respectively. A maximum column annual...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Journal of Geophysical Research - Atmospheres. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing an older version [v1]Go new versionUnprecedented spring 2020 ozone depletion in the context 20 years measurements Eureka, CanadaAuthorsKristofBognariDRaminaAlwardaKimberlyStrongiDMartyn...
Earth and Space Science Open Archive This work has been accepted for publication in Journal of Geophysical Research - Atmospheres. Version RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v2]Unprecedented spring 2020 ozone depletion context 20 years measurements at Eureka, CanadaAuthorsKristofBognariDRaminaAlwardaKimberlyStrongiDMartyn...
Experimental measurements of collision-induced absorption (CIA) cross-sections for CO-H2 and CO2-CH4 complexes were performed using Fourier transform spectroscopy over a spectral range 100-500 cm temperature 200-300 K. These experimentally derived CIA agree with the dependence calculation by Wordsworth (2017), however amplitude is half what was predicted. Furthermore, reported here those measured Turbet (2019). The can be applied to planetary systems CO2-rich atmospheres, such as Mars Venus,...
Abstract. Measurements of Pollution In The Troposphere (MOPITT) is an instrument on NASA's Terra satellite that has measured tropospheric carbon monoxide (CO) from early 2000 to the present day. Validation data instruments like MOPITT often conducted using ground-based measurements ensure continued accuracy space-based instrument's and its scientific results. Previous validation studies generally found a larger bias in poleward 60∘ N. this study, we use 2006 2019 Bruker IFS 125HR Fourier...
<p>The Arctic winter of 2019-2020 was characterized by an unusually persistent polar vortex and temperatures in the lower stratosphere that were consistently below threshold for formation stratospheric clouds (PSCs). These conditions led to ozone loss is comparable Antarctic hole. Ground-based measurements from a suite instruments at Polar Environment Atmospheric Research Laboratory (PEARL) Eureka, Canada (80.05°N, 86.42°W) used investigate chemical...
An unanswered question in planetary science is how could the early Martian atmosphere have maintained a greenhouse effect sufficient to allow for liquid water on surface? A recent study by Word...
Abstract. Measurements of Pollution in the Troposphere (MOPITT) is an instrument on NASA’s Terra satellite that has measured tropospheric carbon monoxide (CO) from early 2000 to present day. Validation data instruments like MOPITT often conducted using ground-based measurements ensure continued accuracy space-based instrument’s and its scientific results. Previous validation studies generally found a larger bias poleward 60 °N. In this study, we use 2006 2019 Bruker IFS 125HR Fourier...
Abstract. EM27/SUNs 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 six-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, as well accuracy precision retrievals from site-to-site bias among TCCON sites. We developed...
Abstract. ACE/TROPOMI Abstract for AMT submission The TROPOspheric Monitoring Instrument (TROPOMI) provides a daily, spatially-resolved (initially 7 × km2, upgraded to 5.6 km2 in August 2019) global data set of CO columns, however, due the relative sparseness reliable ground-based sources, it can be challenging characterize validity and accuracy satellite products remote regions such as high Arctic. In these regions, inter-comparisons supplement model- validation efforts serve verify...
Earth and Space Science Open Archive This work has been accepted for publication in Journal of Geophysical Research - Atmospheres. Version RecordESSOAr is a venue 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]Global Atmospheric OCS Trend Analysis from 22 NDACC StationsAuthorsJames WHanniganiDIvanOrtegaShimaBahramvash ShamsThomasBlumenstockiDJohn...