A5016654791- Geology and Paleoclimatology Research
- Climate change and permafrost
- Cryospheric studies and observations
- Hydrology and Watershed Management Studies
- Groundwater and Isotope Geochemistry
- Isotope Analysis in Ecology
- Arctic and Antarctic ice dynamics
- Fish Ecology and Management Studies
- Geological formations and processes
- Soil and Water Nutrient Dynamics
- Coastal wetland ecosystem dynamics
- Heavy metals in environment
- Hydrology and Sediment Transport Processes
- Tree-ring climate responses
- Geochemistry and Geologic Mapping
- Mercury impact and mitigation studies
- Aquatic Ecosystems and Phytoplankton Dynamics
- Petroleum Processing and Analysis
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Toxic Organic Pollutants Impact
- Climate variability and models
- Soil erosion and sediment transport
- Peatlands and Wetlands Ecology
- Indigenous Studies and Ecology
Wilfrid Laurier University
2015-2024
West Health
2013
Lake Tahoe Community College
2012
University of Waterloo
1998-2009
University of Manitoba
1993
Abstract An overview of current research in isotope hydrology, focusing on recent Canadian contributions, is discussed under the headings: precipitation networks, hydrograph separation and groundwater studies, river basin lake catchment water balance, palaeohydrology from sediment records. Tracer‐based techniques, relying primarily naturally occurring environmental isotopes, have been integrated into a range hydrological biogeochemical programmes, as they effectively complement physical...
Widespread across northern permafrost landscapes, thermokarst ponds and lakes provide vital wildlife habitat play a key role in biogeochemical processes. Stored the sediments of these typically shallow dynamic waterbodies are rich sources paleoenvironmental information whose potential has not yet been fully exploited, likely because concerns over stratigraphic preservation challenges to develop reliable sediment core chronologies. Here, we present an overview recently derived informative...
Postglacial precipitation δ 18 O history has been reconstructed for two regions of Canada. Long-term shifts in the oxygen-isotope composition annual (δ p ) southern Ontario appear to have occurred with a consistent isotope–temperature relation throughout past 11,500 14 C yr. The modern central Canada near present boreal treeline evidently became established between 5000 and 4000 years ago, although during last glacial maximum deglaciation may also similar present. In early Holocene, however,...
Abstract We used stable isotopes (δ 18 O and δ 2 H) water chemistry to characterize the balance hydrolimnological relationships of 57 shallow aquatic basins in Peace‐Athabasca Delta (PAD), northern Alberta, Canada, based on sampling at end 2000 thaw season. Evaporation‐to‐inflow ratios ( E / I ) were estimated using an isotope mass‐balance model tailored accommodate basin‐specific input compositions, which provided effective, first‐order, quantitative framework for identifying balances...
Abstract Floods caused by ice‐jams on the Peace River are considered to be important for maintaining hydro‐ecological conditions of perched basins in Peace‐Athabasca Delta (PAD), Canada, a highly productive and internationally recognized northern boreal ecosystem. Concerns over potential linkages between regulation 1968 hydroelectric production low discharge 1971 during filling reservoir, absence major ice‐jam flood event 1975 1995, water levels 1980s early 1990s have sparked numerous...
Abstract Snowmelt is a crucial source of water for many shallow subarctic lakes, but climate models predict that snowfall will decrease in some regions, with profound ecological consequences. Here we use lake isotope data across gradients terrestrial vegetation cover (open tundra to closed forest) and topographic relief identify lakes are vulnerable desiccation under conditions low snowmelt runoff two landscapes—Old Crow Flats, Yukon, Hudson Bay Lowlands, Manitoba (Canada). Lakes located...
Abstract Many northern lake‐rich regions are undergoing pronounced hydrological change, yet inadequate knowledge of the drivers these landscape‐scale responses hampers our ability to predict future conditions. We address this challenge in thermokarst landscape Old Crow Flats ( OCF ) using a combination remote sensing imagery and monitoring stable isotope compositions lake waters over three thaw seasons (2007–2009). Quantitative analysis confirmed that behavior lakes is strongly influenced by...
Background The extent to which Alberta oil sands mining and upgrading operations have enhanced delivery of bitumen-derived contaminants via the Athabasca River atmosphere Peace-Athabasca Delta (200 km north) is a pivotal question that has generated national international concern. Accounts rare health disorders in residents Fort Chipewyan deformed fish downstream ecosystems provided impetus for several recent expert-panel assessments regarding societal environmental consequences this...
Abstract Aim To assess the long‐term impacts of landscape fire on a mosaic pyrophobic and pyrogenic woody montane vegetation. Location South‐west T asmania, A ustralia. Methods We undertook high‐resolution multiproxy palaeoecological analysis sediments deposited in L ake O sborne ( H artz M ountains N ational P ark, southern asmania), employing analyses pollen, macroscopic microscopic charcoal, organic inorganic geochemistry magnetic susceptibility. Results Sequential fires within study...
Identifying potential regional contamination by Alberta oil sands industrial emissions on sensitive ecosystems like the Peace-Athabasca Delta, ~200 km to north, requires knowledge of historical contaminant levels and trends. Here we provide some these critically-needed data, based analysis metals in a sediment core from an upland precipitation-fed lake delta. The is well-situated record anthropogenic history airborne deposition for this region. Sediment records concern (Pb, Sb, As, Hg)...
Abstract The Arctic has experienced substantial warming during the past century with models projecting continued accompanied by increases in summer precipitation for most regions. A key impact of increasing air surface temperatures is deepening active layer, which expected to alter hydrological processes and pathways. aim this study was determine how one warmest wettest summers decade at a High watershed impacted water infiltration storage deeply thawed soil solute concentrations stream...
A suite of analyses was performed on sediments accumulated during the last 10 700 years in Lake Spaime, a small, hydrologically open water body modem alpine tundra zone Scandes Mountains, west-central Sweden. The study aimed to evaluate (1) nature climate changes that forced late-Holocene lowering altitudinal tree limit region, timing which is known from prior studies based radiocarbon dating subfossil wood, and (2) impact these vegetational an aquatic ecosystem. Arboreal pollen plant...
Abstract Multi-proxy paleolimnological analyses on lake sediment cores from "Spruce Island Lake" (58° 50.82′ N, 111° 28.84′ W), a perched basin in the northern Peace sector of Peace-Athabasca Delta (PAD), Canada, give insights into relative roles flow regulation River and climatic variability hydro-ecology. Results indicate substantial hydro-ecology over past 300 years ranging seasonal to periodic desiccation 1700s markedly wetter conditions during early 1800s 1900s. The reconstruction is...