A5057317744- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Climate variability and models
- Meteorological Phenomena and Simulations
- Air Quality and Health Impacts
- Fire effects on ecosystems
- Atmospheric Ozone and Climate
- Aeolian processes and effects
- Wind and Air Flow Studies
- Air Quality Monitoring and Forecasting
- Vehicle emissions and performance
- Urban Heat Island Mitigation
- Climate Change and Health Impacts
- Plant responses to elevated CO2
- Tropical and Extratropical Cyclones Research
- Plant Water Relations and Carbon Dynamics
- Geology and Paleoclimatology Research
- Cryospheric studies and observations
- Oceanographic and Atmospheric Processes
- Geophysics and Gravity Measurements
- Hydrological Forecasting Using AI
- Hydrology and Watershed Management Studies
- Remote Sensing and LiDAR Applications
- Polar Research and Ecology
University of British Columbia
2012-2022
SNC-Lavalin (Canada)
2013
McGill University
1990-1992
Statistics New Zealand
1988-1990
University of Canterbury
1983-1986
On April 15 and 19, 1998, two intense dust storms were generated over the Gobi desert by springtime low‐pressure systems descending from northwest. The windblown was detected its evolution followed yellow color on SeaWiFS satellite images, routine surface‐based monitoring, through serendipitous observations. cloud recirculating, it removed a precipitating weather system east Asia. 19 crossed Pacific Ocean in 5 days, subsided to surface along mountain ranges between British Columbia...
A size‐segregated soil dust emission and transport model, Northern Aerosol Regional Climate Model (NARCM), was used to simulate the production of Asian during Characterization Experiment‐Asia (ACE‐Asia) period from March May 2001. The model is driven by NCEP reanalyzed meteorology has all atmospheric aerosol physical processes dust: production, transport, growth, coagulation, dry wet deposition. Chinese texture map that infers grain‐size distribution with 12 categories generated drive...
For the first time, long‐range transport of “Kosa” mineral aerosol from western China to southwestern British Columbia is documented. This late April 1998 event coincided with an episode photochemical smog and reduced dispersion in Lower Fraser Valley (LFV). Filter samples region show a massive injection crustal elements (Si, Fe, Al, Ca) concentrations Si approximately double those previously recorded. Ratios these Fe are shown be statistically similar ratios observed events Hawaii China. On...
Abstract The Northern Aerosol Regional Climate Model (NARCM) was used to construct a 44-yr climatology of spring Asian dust aerosol emission, column loading, deposition, trans-Pacific transport routes, and budgets during 1960–2003. Comparisons with available ground observations Total Ozone Mapping Spectrometer (TOMS) Index (AI) measurements verified that NARCM captured most the climatological characteristics spatial temporal distributions, as well interannual daily variations those 44 yr....
Abstract A 44-yr climatology of spring Asian dust aerosol emission, column loading, deposition, trans-Pacific transport routes, and budgets during 1960–2003 was simulated with the Northern Aerosol Regional Climate Model (NARCM). Interannual variability in these properties by model its climate connections are analyzed major climatic indices records ground observations. For production from most source regions, strongest correlations were surface wind speed region area intensity polar vortex...
Methods to characterize chronic exposure ultrafine particles (UFP) can help clarify potential health effects. Since UFP are not routinely monitored in North America, spatiotemporal models one assessment methodology. Portable condensation particle counters were used measure number concentrations (PNC) develop a land use regression (LUR) model. PNC, wind speed and direction measured for sixty minutes at eighty locations during two-week sampling campaign. We conducted continuous monitoring four...
Abstract In much of North America, variables such as temperature, precipitation, snowpack and streamflow are modulated by modes large‐scale ocean‐atmosphere variability the Pacific Decadal Oscillation (PDO), El Niño‐Southern (ENSO) American Pattern (PNA). this study, we test hypothesis that influence these on air temperature precipitation in British Columbia (BC), Canada, can be explained relation to changes frequencies synoptic‐scale circulation types. A catalogue 13 types was derived...
A cost-efficient technology for accurate surface ozone monitoring using gas-sensitive semiconducting oxide (GSS) technology, solar power, and automated cell-phone communications was deployed validated in a 50 sensor test-bed the Lower Fraser Valley of British Columbia, over 3 months from May-September 2012. Before field deployment, entire set instruments colocated with reference at least 48 h, comparing hourly averaged data. The standard error estimate typical range 0-50 ppb ± 2 ppb....
Size‐segregated budgets of soil dust aerosols in Asia for spring 2001 during ACE‐Asia were investigated using the NARCM model [ Gong et al. , 2003b ]. Simulated mass size distributions deposition showed a similar distribution to emission fluxes over source regions and decreased peak corresponding 1–3 μm diameter range downwind regions. The simulations suggest that dry was dominant removal process near areas particles by precipitation major trans‐Pacific transport pathway, where wet exceeded...
The objective of this study was to describe the spatial and temporal structure spring snowpack anomalies in British Columbia, Canada, relate anomaly patterns climatic fluctuations. Cluster analysis used identify relatively homogeneous groups snow course sites, based on April 1 measurements, for periotd 1966–1992. Time series cluster‐averaged were then computed. Synoptic‐scale circulation types defined by applying a correlation‐based map classification technique gridded data sets surface...
Multi-layer perceptron (MLP) artificial neural network (ANN) models are compared with traditional multiple regression (MLR) for daily maximum and average O3 particulate matter (PM10 PM2.5) forecasting. MLP forecasting show little if any improvement over MLR exhibit less skill than do models. Meteorological variables (precipitation, wind, temperature), persistence, co-pollutant data shown to be useful PM predictors. If approaches adopted forecasting, training methods that improve extreme...
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...
Abstract. Several cases of aerosol plumes resulting from trans-Pacific transport were observed between 2 km and 5.3 at Whistler, BC 22 April 2006 to 15 May 2006. The fine particle (<1 μm) chemical composition most the was dominated by sulphate that ranged 1–5 μg m−3 as measured with a Quadrapole Aerosol Mass Spectrometer (Q-AMS). Coarse particles (>1 enhanced in all plumes. Fine organic mass concentrations relatively low nominally anti-correlated increases number coarse particles. ion...
Rust and bunt spores that act as ice nuclei (IN) could change the formation characteristics properties of ice‐containing clouds. In addition, nucleation on rust spores, followed by precipitation, may be an important removal mechanism these from atmosphere. Using optical microscope, we studied four species ( Puccinia graminis , triticina allii Endocronartium harknesssii ) two Tilletia laevis tritici immersed in water droplets. We show cumulative number IN per spore is 5 × 10 −3 0.01, 0.10 at...
The Kirchhofer synoptic classification procedure is applied to both mean sea level and 500-hPa NMC gridded pressure fields for the vicinity of southwestern British Columbia. Exceedances Canadian 1-h Ambient O3 Air Quality Objective 82 ppb at Port Moody, Vancouver, are associated with coincidence a low-level thermal trough an upper-level ridge high pressure. Analysis sequences also reveals importance persistence in development elevated concentrations. application climatology ground-level...