A5017197222- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Methane Hydrates and Related Phenomena
- Arctic and Antarctic ice dynamics
- Icing and De-icing Technologies
- Cryospheric studies and observations
- Oil Spill Detection and Mitigation
- Aeolian processes and effects
- Fire effects on ecosystems
- Meteorological Phenomena and Simulations
- Geology and Paleoclimatology Research
- Aerospace Engineering and Energy Systems
- Soil Moisture and Remote Sensing
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Smart Materials for Construction
- Advanced Electrical Measurement Techniques
- Microwave Imaging and Scattering Analysis
- Infrared Target Detection Methodologies
- Remote Sensing and LiDAR Applications
- Lightning and Electromagnetic Phenomena
- Oceanographic and Atmospheric Processes
- Advanced SAR Imaging Techniques
- Climate change and permafrost
National Research Council Canada
2021-2025
Université de Sherbrooke
2019-2022
Abstract. Dust particles from high latitudes have a potentially large local, regional, and global significance to climate the environment as short-lived forcers, air pollutants, nutrient sources. Identifying locations of local dust sources their emission, transport, deposition processes is important for understanding multiple impacts high-latitude (HLD) on Earth's systems. Here, we identify, describe, quantify source intensity (SI) values, which show potential soil surfaces emission scaled...
Abstract. We present an Arctic aerosol optical depth (AOD) climatology and trend analysis for 2003–2019 spring summertime periods derived from a combination of multi-agency reanalyses, remote-sensing retrievals, ground observations. This includes the U.S. Navy Aerosol Analysis Prediction System ReAnalysis version 1 (NAAPS-RA v1), NASA Modern-Era Retrospective Research Applications, 2 (MERRA-2), Copernicus Atmosphere Monitoring Service (CAMSRA). Spaceborne retrievals AOD are considered...
Abstract. In a companion paper (Xian et al., 2022, part 1 of the study), we present an Arctic aerosol optical depth (AOD) climatology and trend analysis for 2003–2019 spring summertime periods derived from combination reanalyses, remote-sensing retrievals, ground observations. Continued previous discussion as second study, report statistics trends AOD extreme events using U.S. Navy Aerosol Analysis Prediction System ReAnalysis version (NAAPS-RA v1), sun photometer data AErosol RObotic...
Abstract. Remote-sensing (RS)-based estimates of Arctic dust are oftentimes overestimated due to a failure in separating out the contribution from that spatially homogeneous clouds or low-altitude cloud-like plumes. A variety illustrations given with particular emphasis on questionable claims using brightness temperature differences (BTDs) as signature indicator transported mid-latitude deserts generated by local sources. While there is little dispute about presence both Asian and across...
Abstract During freezing rain, secondary ice produced by the fragmentation of drops (FFD) can initiate a chain reaction, potentially transitioning rain into pellets. Including this process in numerical weather prediction models is challenging due to uncertainty mechanism. To bridge gap, study aims evaluate efficiency FFD during pellet precipitation using measurements collected onboard National Research Council Canada (NRC) Convair-580 research aircraft 2022 Winter Precipitation Type...
Improving future climate predictions requires enhancing the current meteorological numerical models for which a better understanding of roles that clouds and aerosols (and their interactions) play in Earth’s weather is crucial.  Along these lines, European Space Agency (ESA) Japan Aerospace Exploration (JAXA) successfully launched Earth Cloud, Aerosol, Radiation Explorer (EarthCARE) satellite May 2024. This mission aims to advance studies global aerosol cloud properties...
We investigated the climatological-scale, monthly binned, seasonal variation of AERONET/Dubovik retrievals across six stations in North American and European Arctic (multiyear sampling periods ranging from 8 to 17 years). A robust, spring-to-summer (StoS) increase radius peak fine mode (FM) component particle size distribution (PSD) was observed for five stations. The FM aerosol optical depth (AOD) effective at individual showed, respectively, a negligible moderate StoS decrease significant...
Abstract. The sub-micron (SM) aerosol optical depth (AOD) is an separation based on the fraction of particles below a specified cutoff radius particle size distribution (PSD) at given radius. It fundamentally different from spectrally separated FM (fine-mode) AOD. We present simple (AOD-normalized) SM versus (SMF vs. FMF) linear equation that explains well-recognized empirical result SMF generally being greater than FMF. AERONET inversion (AERinv) products (combined inputs spectral AOD and...
Abstract Convective clouds play an important role in the Earth’s climate system and are a known source of extreme weather. Gaps our understanding convective vertical motions, microphysics, precipitation across full range aerosol meteorological regimes continue to limit ability predict occurrence intensity these cloud systems. Towards improving predictability, National Science Foundation (NSF) sponsored large field experiment entitled “Experiment Sea Breeze Convection, Aerosols,...
Ice accretion on lifting surfaces induces an aerodynamic penalty in lift and drag aircraft. This performance degradation depends the geometric features, type, surface characteristics of accreted ice airfoil. In present work, we propose a set two-parameter, low-order models to represent some typical topologies: glaze, rime, horn. The parametric space is swept for all types isolate changes causing canonical symmetrical airfoil, which representative airfoil used by National Research Council...
Abstract. Dust particles emitted from high latitudes (≥ 50° N and ≥ 40° S, including Arctic as a subregion 60° N), have potentially large local, regional, global significance to climate environment short-lived forcers, air pollutants nutrient sources. To understand the multiple impacts of High Latitude (HLD) on Earth systems, it is foremost identify geographic locations characteristics local dust Here, we identify, describe, quantify Source Intensity (SI) values using Global Sand Storms Base...
Abstract. Remote sensing (RS) based estimates of Arctic dust are oftentimes overestimated due to a failure in separating out the contribution from that spatially homogeneous clouds or low-altitude cloud-like plumes. A variety illustrations given with particular emphasis on claims using brightness temperature differences (BTDs) as signature indicator transported mid-latitude deserts generated by local sources. While there is little dispute about presence both Asian and across Arctic, direct...
Abstract. In this work we report the airborne aerosol optical depth (AOD) from measurements within freshly emitted anthropogenic plumes arising mining and processing operations in Athabasca Oil Sands Region (AOSR) context of ground-based AERONET climatological daily averaged AODs at Fort McMurray (Alberta, Canada). During two flights on 9 18 June 2018, NASA 4STAR (Spectrometers for Sky-Scanning, Sun-Tracking Atmospheric Research) Sun photometer registered high fine-mode (FM, <1 µm)...
Predicting the accurate type of precipitation during winter storms is crucial for implementation mitigation measures such as aircraft deicing in commercial aviation or spreading salt and abrasives on roads. For this reason, a better understanding microphysical processes leading to types essential. During freezing rain events, secondary ice produced by supercooled raindrops via fragmentation drops (FFD) process can initiate chain reaction, potentially transitioning into pellets. However,...
Transported mineral dust in a Saharan air layer (SAL) contains highly active ice-nucleating particles (INPs) that may be transported across the Atlantic Ocean and subsequently seed clouds Caribbean Americas. During an aircraft campaign around Houston western U.S. Gulf Coast, widespread SAL advected into sampling region allowing for measurement of ability SD following long-range transport. Results showed mean INP concentrations were 3–4.5 times higher than non-Saharan (nSD), but only at...
Abstract. The suggestion of Huang et al. (2015) on the climatological-scale transport Asian dust to Arctic appears be an important and worthwhile assertion. It is unfortunate that authors undermined, a certain degree, quality assertion by misinterpretation critical 24 March 2010 event (which was chosen illustrate their generalized, claim). They attempted characterize key using AERONET/AEROCAN retrievals taken day later misinterpreted those largely cloud-dominated as being...
Abstract. Forests are a dominant biome of the earth and have an important impact on its economic environmental well-being. Forestry applications radar remote sensing addressed in context both forest management ecosystem understanding, modelling monitoring. Nowadays, is being used for lot various fields. Due to polarimetric recent decades, many researchers tended this field. One main advantages SAR images that these independent over time (day night) weather condition. The (POLSAR) compared...