A5063005832- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Vehicle emissions and performance
- Ocean Waves and Remote Sensing
- Tropical and Extratropical Cyclones Research
- Planetary Science and Exploration
- Oil, Gas, and Environmental Issues
- Oil Spill Detection and Mitigation
- Solar and Space Plasma Dynamics
Environment and Climate Change Canada
2021-2025
York University
2019
Dry deposition is an important yet poorly constrained process that removes reactive organic carbon from the atmosphere, making it unavailable for airborne chemical reactions and transferring to other environmental systems. Using aircraft-based measurement method, we provide large-scale estimates of total gas-phase rates fluxes. Observed downwind unconventional oil operations reached up 100 tC hour −1 , with fluxes exceeding 0.1 gC m −2 . The observed lifetimes (τ dep ) were short enough...
Ten one-year simulations were conducted using a nested high-resolution air-quality model (Global Environmental Multiscale-Modelling Air-quality and CHemistry; GEM-MACH).  The nesting is from 10km grid cell size North American domain, to 2.5km domain covering the Canadian provinces of Alberta Saskatchewan (1350 x 1345 km). simulation period was October 1, 2017 through September 30, 2018.  In addition base case (see Fathi et al., 2025, this session, for evaluation case), nine...
We describe the current status of ongoing model improvement and evaluation Oil Sands version Global Environmental Multiscale – Modelling Air-quality CHemistry (GEM-MACH-OS) model.  GEM-MACH-OS was designed to provide 2.5km horizontal grid cell size predictions for chemical processing gases particulate matter emitted from industrial activities in Canadian other sources provinces Alberta, Saskatchewan neighboring regions.  Starting 2022, a successive series updates...
Abstract. We implement a detailed representation of aerosol mixing state in the Global Environmental Multiscale – Modelling Air quality and CHemistry (GEM-MACH) air weather forecast model. Our mixing-state includes three categories: one for more hygroscopic aerosol, less with high black carbon (BC) mass fraction, low BC fraction. The allows us to better resolve two different aspects state: differences hygroscopicity due composition amount absorption enhancement non-absorbing coatings....
Abstract. 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 Chemistry) was improved to make use of the size composition-resolved representation atmospheric aerosols relative humidity GEM-MACH, account for aerosol attenuation radiation calculation. We coupled both MESSy-JVAL (Modular Earth Submodel System) module, through modeled data a new Mie lookup table...
Multiple simulations were conducted using Environment and Climate Change Canada’s Global Environmental Multiscale-Modelling Air-quality CHemistry (GEM-MACH) in order to evaluate the model’s predictive capabilities for concentrations, height of plume emissions, deposition regions within downwind Canadian Oil Sands.  The innermost domain nested setup was 1350x1345 km extent, centered on provinces Alberta Saskatchewan, with a grid-cell size 2.5 km. ...
While transportation emissions have declined over the past several decades, volatile organic compound (VOC) from solvent use applications increased as urban areas expand. In this work, Canadian air quality model (GEM-MACH-TEB) is used to assess importance of during Michigan Ontario Ozone Source Experiment (MOOSE). Model predictions are compared ozone and total mono-substituted aromatics (TOLU) observations collected in Windsor, Ontario. For summer 2018, estimates TOLU smaller (30% for an 8 h...
A column model based on CIRA wind and temperature profiles is employed to assess the characteristics of Hines Doppler‐spread Warner–McIntyre–Scinocca (WMS) non‐orographic drag parametrizations for internal gravity waves. The “Alexander–Dunkerton” variant WMS scheme also briefly considered. This study goes into more detail than previous comparisons by performing a spectral analysis momentum deposition drag, examining ability each reproduce high vertical wavenumber tail consistent with...
<p>The radiative transfer module of an on-line chemical transport models requires input data from aerosol extinction efficiency, single scatter albedo and asymmetry factor, in order to predict the state atmosphere. These optical properties (aerosol depth, AOD), may be integrated vertically for comparison satellite observations. effects also influence shorter wavelengths associated with atmospheric gas photolysis, influencing reactivity. processes harmonized reaction model, such...
Abstract. We implement a detailed representation of aerosol mixing-state into the GEM-MACH air quality and weather forecast model. Our includes three categories: one for more-hygroscopic aerosol, less-hygroscopic with high black carbon (BC) mass fraction, low BC fraction. This is first model this type simulating continent-scale domain. The more-detailed allows us to better resolve two different aspects mixing state: differences in hygroscopicity due composition, amount absorption enhancement...
<p>The photolysis module in Environment and Climate Change Canada’s on-line chemical transport model GEM-MACH (GEM: Global Environmental Multi-scale – MACH: Modelling Air quality Chemistry) was improved by using the composition size-resolved representation of atmospheric aerosols to calculate attenuation radiation module.</p><p>We coupled both aerosol MESSy-JVAL (Modular Earth Sub-Model System) routine through use modeled...
Abstract. The photolysis module in Environment and Climate Change Canada’s on-line chemical transport model GEM-MACH (GEM: Global Environmental Multi-scale – MACH: Modelling Air quality Chemistry) was improved, to make use of the size composition-resolved representation atmospheric aerosols relative humidity GEM-MACH, account for aerosol attenuation radiation calculation. We coupled both MESSy-JVAL (Modular Earth Sub-Model System) module, through modeled data a new Mie lookup table...