Christopher E. Sioris
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View article: Development and validation of satellite-derived surface NO <sub>2</sub> estimates using machine learning versus traditional approaches in North America
Development and validation of satellite-derived surface NO <sub>2</sub> estimates using machine learning versus traditional approaches in North America Open
Nitrogen dioxide (NO2) is one of the key pollutants with profound implications for air quality, and human health, and is needed to establish the air quality health index (AQHI). Currently, over 600 surface air monitoring stations are distr…
View article: The High-Altitude Aerosols, Water Vapor, and Clouds Mission: Concept, Scientific Objectives, and Data Products
The High-Altitude Aerosols, Water Vapor, and Clouds Mission: Concept, Scientific Objectives, and Data Products Open
The High-Altitude Aerosols, Water Vapor, and Clouds (HAWC) mission is an observing system, with a planned launch around 2031, that is being developed by the Canadian Space Agency to provide collocated global measurements of aerosols, water…
View article: Development and validation of satellite-derived surface NO <sub>2</sub> estimates using machine learning versus traditional approaches in North America
Development and validation of satellite-derived surface NO <sub>2</sub> estimates using machine learning versus traditional approaches in North America Open
Nitrogen dioxide (NO2) is one of the key pollutants with profound implications for air quality, and human health, and is needed to establish the air quality health index (AQHI). Currently, over 600 surface air monitoring stations are distr…
View article: Infrared Satellite Detection Limits for Monitoring Atmospheric Ammonia
Infrared Satellite Detection Limits for Monitoring Atmospheric Ammonia Open
This study investigates single pixel nadir viewing detection limit of atmospheric ammonia for a range of area flux mapping satellite infrared sensor spectral resolutions (0.05–2.0 cm−1) and measurement noise levels. The detection level of …
View article: Assessment of ACE-MAESTRO v3.13 multi-wavelength stratospheric aerosol extinction measurements
Assessment of ACE-MAESTRO v3.13 multi-wavelength stratospheric aerosol extinction measurements Open
The Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (MAESTRO) instrument on the SCISAT satellite provides aerosol extinction measurements in multiple solar wavelength bands. In this study, we …
View article: An Independent Evaluation of GHGSat Methane Emissions: Performance Assessment
An Independent Evaluation of GHGSat Methane Emissions: Performance Assessment Open
An independent evaluation of methane emissions data from GHGSat, a private company that operates a constellation of small microsatellites flying Fabry‐Perot spectrometers operating at 1.6 µm, was performed. Data from multiple GHGSat commer…
View article: Intelligent pointing increases the fraction of cloud-free CO2 and CH4 observations from space
Intelligent pointing increases the fraction of cloud-free CO2 and CH4 observations from space Open
For most CO 2 and CH 4 satellites, only a small percentage (∼10%) of observations yield successful retrievals, with the remaining ∼90% rejected, primarily due to the effects of clouds. Discarding this large fraction of data is an inefficie…
View article: The SPARC water vapour assessment II: biases and drifts of water vapour satellite data records with respect to frost point hygrometer records
The SPARC water vapour assessment II: biases and drifts of water vapour satellite data records with respect to frost point hygrometer records Open
Satellite data records of stratospheric water vapour have been compared to balloon-borne frost point hygrometer (FP) profiles that are coincident in space and time. The satellite data records of 15 different instruments cover water vapour …
View article: The SPARC water vapour assessment II: Biases and drifts of water vapour satellite data records with respect to frost point hygrometer records
The SPARC water vapour assessment II: Biases and drifts of water vapour satellite data records with respect to frost point hygrometer records Open
Satellite data records of stratospheric water vapour have been compared to balloon-borne frost point hygrometer (FP) profiles that are coincident in space and time. The satellite data records of 15 different instruments cover water vapour …
View article: Long-term trends and radiative impact in vertically resolved stratospheric water vapour from ESA WV_cci data records
Long-term trends and radiative impact in vertically resolved stratospheric water vapour from ESA WV_cci data records Open
Water vapour in the upper troposphere and stratosphere has a significant impact both on the radiative and chemical properties of the atmosphere.  Reliable water vapour climate data records (CDRs) are essential for use in climate resea…
View article: Water vapour and ozone in the upper troposphere–lower stratosphere: global climatologies from three Canadian limb-viewing instruments
Water vapour and ozone in the upper troposphere–lower stratosphere: global climatologies from three Canadian limb-viewing instruments Open
This study presents upper troposphere–lower stratosphere (UTLS) water vapour and ozone climatologies generated from 14 years (June 2004 to May 2018) of measurements made by three Canadian limb-viewing satellite instruments: the Atmospheric…
View article: SAGE III/ISS ozone and NO <sub>2</sub> validation using diurnal scaling factors
SAGE III/ISS ozone and NO <sub>2</sub> validation using diurnal scaling factors Open
We developed a set of solar zenith angle, latitude- and altitude-dependent scaling factors to account for the diurnal variability in ozone (O3) and nitrogen dioxide (NO2) when comparing Stratospheric Aerosol and Gas Experiment (SAGE) III/I…
View article: Comment on amt-2022-131
Comment on amt-2022-131 Open
We developed a set of solar zenith angle, latitude- and altitude-dependent scaling factors to account for the diurnal variability in ozone and NO2 when comparing Stratospheric Aerosol and Gas Experiment (SAGE) III/ISS observations to obser…
View article: An optimal estimation-based retrieval of upper atmospheric oxygen airglow and temperature from SCIAMACHY limb observations
An optimal estimation-based retrieval of upper atmospheric oxygen airglow and temperature from SCIAMACHY limb observations Open
An optimal estimation-based algorithm is developed to retrieve the number density of excited oxygen (O2) molecules that generate airglow emissions near 0.76 µm (b1Σg+ or A band) and 1.27 µm (a1Δg or 1Δ band) in the upper atmosphere. Both o…
View article: Nice UTLS climatologies in tropopause relative coordinates
Nice UTLS climatologies in tropopause relative coordinates Open
This study presents upper troposphere – lower stratosphere (UTLS) water vapour and ozone climatologies generated from 14 years (June 2004 to May 2018) of measurements made by three Canadian limb-viewing satellite instruments: the Atmospher…
View article: SAGE III/ISS Ozone and NO <sub>2</sub> Validation using Diurnal Scaling Factors
SAGE III/ISS Ozone and NO <sub>2</sub> Validation using Diurnal Scaling Factors Open
We developed a set of solar zenith angle, latitude- and altitude-dependent scaling factors to account for the diurnal variability in ozone and NO2 when comparing Stratospheric Aerosol and Gas Experiment (SAGE) III/ISS observations to obser…
View article: The SPARC Water Vapor Assessment II: assessment of satellite measurements of upper tropospheric humidity
The SPARC Water Vapor Assessment II: assessment of satellite measurements of upper tropospheric humidity Open
Nineteen limb-viewing data sets (occultation, passive thermal, and UV scattering) and two nadir upper tropospheric humidity (UTH) data sets are intercompared and also compared to frost-point hygrometer balloon sondes. The upper troposphere…
View article: Water vapour and ozone in the upper troposphere – lower stratosphere: Global climatologies from three Canadian limb-viewing instruments
Water vapour and ozone in the upper troposphere – lower stratosphere: Global climatologies from three Canadian limb-viewing instruments Open
This study presents upper troposphere – lower stratosphere (UTLS) water vapour and ozone climatologies generated from 14 years (June 2004 to May 2018) of measurements made by three Canadian limb-viewing satellite instruments: the Atmospher…
View article: Comment on amt-2022-52
Comment on amt-2022-52 Open
Abstract. An optimal estimation-based algorithm is developed to retrieve the number density of excited oxygen (O2) molecules that generate airglow emissions near 0.76âµm (b1Σg+ or A band) and 1.27âµm (a1Îg or 1Πband) in the upp…
View article: Comment on amt-2022-52
Comment on amt-2022-52 Open
Abstract. An optimal estimation-based algorithm is developed to retrieve the number density of excited oxygen (O2) molecules that generate airglow emissions near 0.76 µm (b1Σg+ or A band) and 1.27 µm (a1Δg or 1Δ band) in the upper atmosphe…
View article: An optimal estimation-based retrieval of upper atmospheric oxygen airglow and temperature from SCIAMACHY limb observations
An optimal estimation-based retrieval of upper atmospheric oxygen airglow and temperature from SCIAMACHY limb observations Open
An optimal estimation-based algorithm is developed to retrieve number density of excited oxygen (O2) molecules that generate airglow emissions near 0.76 μm (A band) and 1.27 μm (1Δ band) in the upper atmosphere. Both oxygen bands are impor…
View article: Development of aerosol optical properties for improving the MESSy photolysis module in the GEM-MACH v2.4 air quality model and application for calculating photolysis rates in a biomass burning plume
Development of aerosol optical properties for improving the MESSy photolysis module in the GEM-MACH v2.4 air quality model and application for calculating photolysis rates in a biomass burning plume Open
The photolysis module in Environment and Climate Change Canada's online chemical transport model GEM-MACH (GEM: Global Environmental Multi-scale – MACH: Modelling Air quality and Chemistry) was improved to make use of the online size and c…
View article: Comment on amt-2021-300
Comment on amt-2021-300 Open
Abstract. Nineteen limb-viewing data sets (occultation, passive thermal, and UV scattering) and two nadir upper tropospheric humidity (UTH) data sets are intercompared and also compared to frost-point hygrometer balloon sondes. The upper t…
View article: Review of &amp;#8220;The SPARC water vapor assessment II: Assessment of satellite measurements of upper tropospheric water vapor&amp;#8221; by William Read et al.
Review of &#8220;The SPARC water vapor assessment II: Assessment of satellite measurements of upper tropospheric water vapor&#8221; by William Read et al. Open
Abstract. Nineteen limb-viewing data sets (occultation, passive thermal, and UV scattering) and two nadir upper tropospheric humidity (UTH) data sets are intercompared and also compared to frost-point hygrometer balloon sondes. The upper t…
View article: Comment on amt-2021-252
Comment on amt-2021-252 Open
Abstract. For the past 17Â years, the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) instrument on the Canadian SCISAT satellite has been measuring profiles of atmospheric ozone. The latest operational versions o…
View article: The outflow of Asian biomass burning carbonaceous aerosol into the upper troposphere and lower stratosphere in spring: radiative effects seen in a global model
The outflow of Asian biomass burning carbonaceous aerosol into the upper troposphere and lower stratosphere in spring: radiative effects seen in a global model Open
Biomass burning (BB) over Asia is a strong source of carbonaceous aerosols during spring. From ECHAM6–HAMMOZ model simulations and satellite observations, we show that there is an outflow of Asian BB carbonaceous aerosols into the upper tr…