A5103205408- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Aeolian processes and effects
- Air Quality Monitoring and Forecasting
- Vehicle emissions and performance
- Fire effects on ecosystems
- Advanced Chemical Sensor Technologies
- Plant responses to elevated CO2
- Historical Geography and Cartography
- Stroke Rehabilitation and Recovery
- Indoor Air Quality and Microbial Exposure
- Muscle activation and electromyography studies
- Gas Sensing Nanomaterials and Sensors
- Geographic Information Systems Studies
- Global Energy and Sustainability Research
- Fish Ecology and Management Studies
- Hydrology and Sediment Transport Processes
- Disaster Management and Resilience
- Indian and Buddhist Studies
- Municipal Solid Waste Management
- Archaeological Research and Protection
- Climate change and permafrost
Environment and Climate Change Canada
2009-2022
Quality Research
2022
Pacific Northwest National Laboratory
2010
University of Miami
1980
Abstract. We interpret a suite of satellite, aircraft, and ground-based measurements over the North Pacific Ocean western America during April–May 2006 as part Intercontinental Chemical Transport Experiment Phase B (INTEX-B) campaign to understand implications long-range transport East Asian emissions America. The Canadian component INTEX-B included 33 vertical profiles from Cessna 207 aircraft equipped with an aerosol mass spectrometer. Long-range organic aerosols was insignificant,...
Abstract One year of aerosol particle observations from Alert, Nunavut shows that new formation (NPF) is common during clean periods the summertime Arctic associated with attendant low condensation sinks and presence methane sulfonic acid (MSA), a product atmospheric oxidation dimethyl sulfide (DMS). The time periods, defined using distribution refractory black carbon number concentrations, increase in frequency June through August as anthropogenic influence dwindles. During concentrations...
Abstract. The Whistler Aerosol and Cloud Study (WACS 2010), included intensive measurements of trace gases particles at two sites on Mountain. Between 6–11 July 2010 there was a sustained high-pressure system over the region with cloud-free conditions highest temperatures study. During this period, organic aerosol concentrations rose from <1 μg m−3 to ∼6 m−3. Precursor gas composition show that these organics were almost entirely secondary biogenic nature. Throughout July, anthropogenic...
Abstract. The water-soluble fractions of aerosol filter samples and cloud water collected during the Whistler Aerosol Cloud Study (WACS 2010) were analyzed using an Aerodyne mass spectrometer (AMS). This is first study to report AMS organic spectra re-aerosolized water, make direct comparison between at same location. In general, very similar those less volatile organics. By a photochemical reactor oxidize both extracts we find evidence that fragmentation organics in increases their...
Abstract Primary marine aerosol (PMA)‐cloud interactions off the coast of California were investigated using observations aerosol, cloud condensation nuclei (CCN), and stratocumulus clouds during Eastern Pacific Emitted Aerosol Cloud Experiment (E‐PEACE) Stratocumulus Observations Los‐Angeles Emissions Derived Aerosol‐Droplets (SOLEDAD) studies. Based on recently reported measurements PMA size distributions, a constrained lognormal‐mode‐fitting procedure was devised to isolate number...
Abstract. Formaldehyde measurements can provide useful information about photochemical activity in ambient air, given that HCHO is formed via numerous oxidation processes. Proton transfer reaction mass spectrometry (PTR-MS) an online technique allows measurement of VOCs at the sub-ppbv level with good time resolution. PTR-MS quantification hampered by humidity dependence instrument sensitivity, higher leading to loss signal. In this study we present analytical, first principles approach...
Abstract. Ambient particles collected on teflon filters at the Peak of Whistler Mountain, British Columbia (2182 m a.s.l.) during spring and summer 2009 were measured by Fourier transform infrared (FTIR) spectroscopy for organic functional groups (OFG). The project mean standard deviation aerosol mass concentrations (OM) all samples was 3.2±3.3 (μg m−3). Measurements fragments, size, number used to separate fossil-fuel combustion burning non-burning forest sources aerosol. OM composed same...
The first documented case of long‐range transport Saharan dust over a pathway spanning Asia and the Pacific to western North America is described. Crustal material generated by African storms during period 28 February 3 March 2005 reached Canada on 13–14 was observed lidar sunphotometer in Vancouver region high‐altitude aerosol instrumentation at Whistler Peak. Global chemical models (GEOS‐Chem NRL NAAPS) confirm suggest source attribution simplified this distinct, somewhat unusual, lack...
Abstract. The meteorology and physico-chemical characteristics of aerosol associated with two new cases long range dust transport affecting western Canada during spring 2006 are described. Each event showed enhancements both sulfate crustal material Asian origin. However, the events were quite different character demonstrate highly variable nature such events. April was a significant considerable enhancement fine particle while May weaker event, also enhancement. latter notable in sense that...
The aerosol indirect effect remains the most uncertain aspect of climate change modeling, calling for characterization individual particles sizes and compositions with high spatial temporal resolution. We present first deployment our single particle mass spectrometer (SPLAT II) operated in dual data acquisition mode to simultaneously measure number concentrations, density, asphericity, size quantitative composition, resolution better than 60 s, thus yielding all required properties...
Proton transfer reaction mass spectrometry (PTR‐MS) volatile organic compound (VOC) measurements were made at the Centre for Atmospheric Research Experiments Egbert, Ontario, over a five week period in May to June 2007. VOCs also analyzed by gas chromatography and with fluorescence detector sensitive formaldehyde. This is well positioned site contrasting biogenic versus anthropogenic sources. In particular, southerly flow from Southern VOC signal was observed have strong influence, as seen...
Abstract. In spring 2002, an atmospheric measurement site was established at the peak of Whistler Mountain in British Columbia, Canada to measure trace gases, particle chemistry and physics, meteorology. This paper uses continuous measurements from March 2002 December 2006 investigate influence trans-Pacific transport North American forest fires on both O3 CO Whistler. Annual mean mixing ratios were 41 ppbv (monthly means 35–48 ppbv) 145 113–177 respectively with species exhibiting annual...
Abstract. Substantial biogenic secondary organic aerosol (BSOA) formation was investigated in a coniferous forest mountain region Whistler, British Columbia. A largely growth episode observed, providing unique opportunity to investigate BSOA chemistry forested environment with limited influence from anthropogenic emissions. Positive matrix factorization of mass spectrometry (AMS) measurement identified two types (BSOA-1 and BSOA-2), which were primarily generated by gas-phase oxidation...
Abstract. We interpret observations from the Intercontinental Chemical Transport Experiment, Phase B (INTEX-B) in spring 2006 using a global chemical transport model (GEOS-Chem) to evaluate sensitivities of free troposphere above North Pacific Ocean and America Asian anthropogenic emissions. develop method use satellite tropospheric NO2 columns provide timely estimates trends NOx emissions increased by 33% for China 29% East Asia 2003 2006. examine measurements three aircraft platforms...
Abstract. Biomass burning emissions emit a significant amount of trace gases and aerosols can affect atmospheric chemistry radiative forcing for hundreds or thousands kilometres downwind. They also contribute to exceedances air quality standards have negative impacts on human health. We present case study an intense wildfire plume from Siberia that affected the across Pacific Northwest 6–10 July 2012. Using satellite measurements (MODIS True Colour RGB imagery MODIS AOD), we track smoke its...
Abstract Meteorology and microphysics affect cloud formation, droplet distributions, shortwave reflectance. The Eastern Pacific Emitted Aerosol Cloud Experiment the Stratocumulus Observations of Los‐Angeles Emissions Derived Aerosol‐Droplets studies provided measurements in six case thermodynamic properties, initial particle number distribution composition, drop distribution. In this study, we use simulations from a chemical microphysical aerosol‐cloud parcel (ACP) model with explicit...
Abstract. Daily air concentrations of inorganic nitrogen (N) species, including gaseous HNO3 and particulate-bound (p)NH4+ pNO3-, sulfur (S) SO2 pSO42-, precipitation NO3-, NH4+, SO42-, have been routinely monitored by the Canadian Air Precipitation Monitoring Network (CAPMoN) since 1983. Data at 15 rural sites from 2000–2018 were used to estimate dry wet N S deposition fluxes, which then explore their spatiotemporal trends assess ecosystem damage through a retrospective analysis critical...
Abstract. Forest fires in Northern California and Oregon were responsible for two significant regional scale aerosol transport events observed southern British Columbia during summer 2008. A combination of ground based (CORALNet) satellite (CALIPSO) lidar, sunphotometry high altitude chemistry observations permitted unprecedented characterization forest fire plume height mixing as well description optical properties physicochemistry the aerosol. In southwestern BC, lidar show smoke to be...
Abstract A mountain air chemistry observatory has been operational on the summit of Whistler Mountain in British Columbia, Canada, since 2002. 1-yr dataset condensation nuclei (CN) concentration from this site analyzed along with corresponding meteorological data to assess frequency and patterns influence planetary boundary layer (PBL). Characterization masses sampled as either PBL influenced or representative free troposphere (FT) is important subsequent analysis data. Median CN...
Abstract. A large fraction of submicron aerosol mass throughout the continental boundary layer consists secondary organic (SOA) mass. As such, ability chemical transport models to accurately predict greatly depends on their SOA. Although there has been much recent effort better describe SOA formation mechanisms in models, little attention paid effects model spatial resolution predictions. The Whistler Aerosol and Cloud Study (WACS 2010), held between 22 June 28 July 2010 conducted at...
The dry deposition process refers to the flux loss of an atmospheric pollutant due uptake by earth's surfaces. Dry a chemical species is typically calculated as product its surface-layer concentration and velocity (Vd). Field measurement based Vd data are very scarce or do not exist for many considered in chemistry transport models. In present study, gaseous particulate schemes were applied generate database hourly 45 three particle size ranges two years (2016-2017) at 15 km horizontal...