A5058057711- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Dental Erosion and Treatment
- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Dental materials and restorations
- Air Quality and Health Impacts
- Spectroscopy and Laser Applications
- Dental Radiography and Imaging
- Dental Trauma and Treatments
- Ocean Acidification Effects and Responses
- Spectroscopy and Chemometric Analyses
- Dental Health and Care Utilization
- Atmospheric aerosols and clouds
- Soil and Unsaturated Flow
- Endodontics and Root Canal Treatments
- Temporomandibular Joint Disorders
- Magnetic properties of thin films
- Methane Hydrates and Related Phenomena
- ZnO doping and properties
- Magnetic and transport properties of perovskites and related materials
- Topic Modeling
- High voltage insulation and dielectric phenomena
Environment and Climate Change Canada
2017-2025
Peking University
2009-2025
Gansu Provincial Center for Disease Control and Prevention
2025
Lanzhou Veterinary Research Institute
2024-2025
Chinese Academy of Agricultural Sciences
2024-2025
Lanzhou University
2024-2025
National Clinical Research Center for Digestive Diseases
2019-2024
Hebei University of Science and Technology
2023-2024
Ministry of Agriculture and Rural Affairs
2024
Anhui Agricultural University
2024
TROPOMI, on-board the Sentinel-5 Precursor satellite is a nadir-viewing spectrometer measuring reflected sunlight in ultraviolet, visible, near-infrared, and shortwave infrared spectral range. From these spectra several important air quality climate-related atmospheric constituents are retrieved at an unprecedented high spatial resolution, including nitrogen dioxide (NO2). We present first retrievals of TROPOMI NO2 over Canadian Oil Sands, contrasting them with observations from OMI...
Abstract. In September 2016, 36 spectrometers from 24 institutes measured a number of key atmospheric pollutants for period 17 d during the Second Cabauw Intercomparison campaign Nitrogen Dioxide measuring Instruments (CINDI-2) that took place at Cabauw, Netherlands (51.97∘ N, 4.93∘ E). We report on outcome formal semi-blind intercomparison exercise, which was held under umbrella Network Detection Atmospheric Composition Change (NDACC) and European Space Agency (ESA). The three major goals...
Abstract. The TROPOspheric Monitoring Instrument (TROPOMI) aboard the Sentinel-5 Precursor satellite (launched on 13 October 2017) is a nadir-viewing spectrometer measuring reflected sunlight in ultraviolet, visible, near-infrared, and shortwave infrared spectral ranges. measured spectra are used to retrieve total columns of trace gases, including nitrogen dioxide (NO2). For ground validation these measurements, Pandora spectrometers, which high-quality NO2 via direct-sun widely used. In...
Abstract. The second Cabauw Intercomparison of Nitrogen Dioxide measuring Instruments (CINDI-2) took place in (the Netherlands) September 2016 with the aim assessing consistency multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements tropospheric species (NO2, HCHO, O3, HONO, CHOCHO and O4). This was achieved through coordinated operation 36 spectrometers operated by 24 groups from all over world, together a wide range supporting reference observations (in situ...
Xiaokeng green tea (XKGT), named for its origin, brings high economic benefits to the region due superior quality, but it is susceptible fraud. In this study, 131 roasted teas from different origins in Anhui Province were used as samples investigate ability of surface-enhanced Raman spectroscopy (SERS) combined with chemometrics accurately discriminate narrow regions. First, spherical Ag nanoparticles (AgNPs) prepared SERS substrates. A stratified 5-fold cross-validation method was divide...
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 Ozone depletion events in the polar troposphere have been linked to extremely high concentrations of bromine, known as bromine explosion (BEE). However, optimum meteorological conditions for occurrence these remain uncertain. On 4–5 April 2011, a combination both blowing snow and stable shallow boundary layer was observed during BEE at Eureka, Canada (86.4°W, 80.1°N). Measurements made by Multi‐Axis Differential Optical Absorption Spectroscopy spectrometer were used retrieve BrO...
This paper presents long-term intercomparisons (2003–2017) between ozone and NO2 measured by the Optical Spectrograph Infra-Red Imager System (OSIRIS) Atmospheric Chemistry Experiment (ACE) satellite instruments, ground-based instruments at Polar Environment Research Laboratory (PEARL), near Eureka, Nunavut, Canada (80∘N, 86∘W). The include four zenith-sky differential optical absorption spectroscopy (DOAS) two Fourier transform infrared (FTIR) spectrometers, a Brewer spectrophotometer....
Objectives: To test if cigarette smoke (CS) causes discoloration of enamel, dentin, and composite resin restorations induces color mismatch between dental hard tissues the restorations, to compare findings with effects aerosol generated by tobacco heating system (THS) 2.2. Method materials: Twenty-two human premolars were prepared Class V cavities restored Filtek Supreme Ultra (3M Espe) resin. Teeth divided into two groups exposed either CS from 20 reference cigarettes (3R4F) or THS 2.2...
Satellite-derived and reported sulfur dioxide (SO2) emissions from the Canadian oil sands are shown to have been consistent up 2013. Post-2013, these sources of data diverged, with dropping by a factor two, while satellite-derived for region remained relatively constant, discrepancy (satellite-derived minus emissions) peaking at 50 kt(SO2) yr−1 around 2016. The 2013–2014 period corresponds when new flue-gas desulfurization units came on-line. Previous work has established high level...
Abstract Bromine explosions and corresponding ozone depletion events are common in the Arctic spring. The snowpack on sea ice salt aerosols (SSA) both thought to release bromine, but relative contribution of each source is not yet known. Furthermore, role atmospheric conditions fully understood. Long‐term measurements bromine monoxide (BrO) provide useful insight into underlying processes activation. Here we present a 4‐year data set (2016–2019) springtime BrO partial columns retrieved from...
A lockdown was implemented in Canada mid-March 2020 to limit the spread of COVID-19. In wake this lockdown, declines nitrogen dioxide (NO2) were observed from TROPOspheric Monitoring Instrument (TROPOMI). method is presented quantify how much decrease due itself as opposed variability meteorology and satellite sampling. The operational air quality forecast model, GEM-MACH (Global Environmental Multi-scale - Modelling Air CHemistry), used together with TROPOMI determine expected NO2 columns...
Abstract. Within the framework of International Arctic Systems for Observing Atmosphere (IASOA), we report a modelling-based study on surface ozone across Arctic. We use from six sites – Summit (Greenland), Pallas (Finland), Barrow (USA), Alert (Canada), Tiksi (Russia), and Villum Research Station (VRS) at Nord (North Greenland, Danish realm) ozone-sonde data three Canadian sites: Resolute, Eureka, Alert. Two global chemistry models transport model (parallelised-Tropospheric Offline Model...
Abstract. The tropospheric NO2 vertical column density (VCD) values measured by the Tropospheric Monitoring Instrument (TROPOMI) were used to study variability and estimate urban NOx emissions for 261 major cities worldwide. algorithm isolated three components in data – background NO2, from sources, industrial point sources then each of these was analyzed separately. method is based on fitting satellite a statistical model with empirical plume dispersion functions driven meteorological...
Foot-and-mouth disease virus (FMDV) are small, icosahedral viruses that cause serious clinical symptoms in livestock. The FMDV VP1 protein is a key structural component, facilitating entry. Here, we find the E3 ligase RNF5 interacts with and targets it for degradation through ubiquitination at lys200 of VP1, ultimately inhibiting replication. Mutations this lysine site have been found to increase replication mice. Importantly, pharmacological activator Analog-1 alleviates development mouse...
Atmospheric trace gases near the Earth’s surface can have important human and environmental health impacts. In particular, gas nitrogen dioxide (NO2), which is commonly emitted by traffic, biomass burning, industrial sources, be a major threat to respiratory health, leading increased rates of asthma, lung cancer, overall mortality. Greater Toronto Area (GTA) in Detroit-Windsor (DWA), NO2 other are being measured ground-based Pandora UV-visible spectrometers that part Pandonia...
The hourly tropospheric NO2 vertical column density (VCD) values measured by TEMPO were used to study the diurnal andseasonal variability in 34 urban areas over North America and Caribbean during period from August 2023 October 2024. A recently developed algorithm (Fioletov et al., 2024) isolated three components data: background NO2, emissions, industrial point sources, then each of these was analyzed separately. method is based on fitting satellite data a statistical model with empirical...
Abstract Ozone is an important atmospheric constituent, exerting a pivotal influence on chemistry, air quality, and climate change. The monitoring of its distribution variation crucial for advancing our understanding ozone development related processes. This study presents the first spatial temporal distributions total columns (TOC) retrieved from Geostationary Interferometric Infrared Sounder (GIIRS), board China's FengYun‐4B satellite (FY‐4B/GIIRS) launched in 2021. Particularly, we focus...
Unusually cold conditions in Arctic winter 2010/11 led to large stratospheric ozone loss. We investigate this with UV‐visible measurements made at Eureka, Canada (80.05°N, 86.42°W) from 1999–2011. For 8–22 March 2011, OClO was enhanced, indicating chlorine activation above Eureka. Ozone columns were lower than any other year the record, reaching minima of 237 DU and 247 two datasets. The average NO 2 column inside vortex, measured visible UV wavelengths, 46 ± 30% 45 27% 2011 previous years....
Abstract. An unprecedented ozone loss occurred in the Arctic spring 2011. The details of event are revisited from twice-daily total and NO2 column measurements eight SAOZ/NDACC (Système d'Analyse par Observation Zénithale/Network for Detection Atmospheric Composition Changes) stations Arctic. It is shown that depletion polar vortex reached 38% (approx. 170 DU) by end March, which larger than 30% previous record 1996. Aside long extension cold stratospheric NAT PSC period, amplitude to be...