A5075638494- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Oceanographic and Atmospheric Processes
- Cryospheric studies and observations
- Climate change and permafrost
- Paleontology and Stratigraphy of Fossils
- Microbial Community Ecology and Physiology
- Geological formations and processes
- Methane Hydrates and Related Phenomena
- Marine and coastal ecosystems
- Planetary Science and Exploration
- Groundwater and Isotope Geochemistry
- Underwater Vehicles and Communication Systems
- Mine drainage and remediation techniques
- Isotope Analysis in Ecology
- Geochemistry and Geologic Mapping
- Fish Ecology and Management Studies
- Space Exploration and Technology
- Geochemistry and Elemental Analysis
- Aquatic Ecosystems and Phytoplankton Dynamics
- Mercury impact and mitigation studies
- Meteorological Phenomena and Simulations
- Ocean Waves and Remote Sensing
- Diatoms and Algae Research
- Marine animal studies overview
University of British Columbia
2013-2024
Université de Montpellier
2014
Laboratoire d'Informatique, de Robotique et de Microélectronique de Montpellier
2014
Centre National de la Recherche Scientifique
2014
Search for Extraterrestrial Intelligence
2011-2014
Environment and Climate Change Canada
2011
Université Laval
2011
University of Alberta
2011
Center for Northern Studies
2011
Queen's University
2011
The influence of spatial and temporal variations in wind forcing on the circulation lakes is investigated using field data three‐dimensional Estuary Lake Computer Model (ELCOM) applied to Kinneret. Kinneret from six thermistor chains eight anemometers deployed during July 2001 are presented. Internal wave motions well reproduced by numerical model when forced with a spatially uniform taken station near lake center; however, simulated seiche amplitudes too large (especially vertical mode 2)...
Abstract On 4 August 2014, a catastrophic breach of the Mount Polley mine tailings impoundment released ~25 M m 3 and water scoured an unknown quantity overburden into West Basin Quesnel Lake. We document Lake River observations for 2 months postspill. Breach inflows raised by 7.7 cm, equivalent to ~21 . The hypolimnion was modified immediately, exhibiting increased temperature (~5°C 6–7.5°C), conductivity (110 160 μS/cm), turbidity (<1 200–1000 nephelometric units (NTU)). Cooscillating...
Mercury (Hg) profiles were compared to of climate indicators including microfossil remains and algal-derived or S2 carbon (C) in dated sediment cores from 14 lakes spanning latitudinal longitudinal gradients across the Canadian high subarctic. Hg fluxes increased postindustrialization (post-∼1850) 11 these (postindustrialization (ΔHgFF) = 2−24 μg m−2 y−1). Correction HgFF for catchment contributions demonstrated that deposition originating catchment-independent factors, such as atmospheric...
Abstract Below the temperature of maximum density (TMD) in freshwater lakes, heating at lateral margins produces gravity currents along bottom slope, akin to katabatic winds atmosphere and on continental shelves. We describe axisymmetric basin‐scale circulation driven by heat flux shorelines polar Lake Kilpisjärvi. A dense underflow originating near shore converges toward lake center, where it warm upwelling return flow across bulk water column. The flow, being subject Coriolis force,...
Deep lakes in temperate climates represent around 50% of the world&#8217;s surface, liquid freshwater storage, yet mechanisms governing their seasonal deepwater renewal&#8212;and, turn, ability to support ecosystems&#8212;remain somewhat elusive. These have depths hundreds meters thus experience extreme hydrostatic pressures, causing compressibility significantly affect circulation. Combined with windstorms and inverse thermal stratification, this is hypothesized trigger...
Lakes are an important part of the environment, being influenced by their inflows and influencing outflows. The physical properties lake water, such as temperature dissolved oxygen concentration, affect downstream habitats ecosystems. Limnological processes, upwelling, can rapidly change river properties. Upwelling introduces a sudden influx cold water downstream, potentially disrupting riverine ecosystem, including salmon migration, which is closely tied to temperature.Upwelling occurs in...
Penetrative convection in the surface layer of a midsize temperate lake (5 km 2 ) was investigated both summer and winter using conductivity‐temperature‐depth (CTD) logger mounted on an autonomous underwater vehicle (AUV) flown repeatedly along horizontal transects at selected depths. In summer, epilimnion cooled differentially during calm evening (240 297 W m −2 east west sides lake, respectively). These cooling rates agree well with average net heat flux 270 ths. estimated from...
Diatoms are potentially the most important biomonitors of environmental change in high arctic lakes and ponds, but to date few autecological data available. Because shallow nature many these water bodies, a large proportion taxa periphytic planktonic diatoms absent for part. By determining microhabitat substrate preferences benthic diatom taxa, potential exists infer past changes available habitats from fossil assemblages collected sediment cores ultimately reconstruct climatic responsible...
This study determined the natural abundance isotopic compositions ((13)C, (14)C) of primary carbon pools and microbial communities associated with modern freshwater microbialites located in Pavilion Lake, British Columbia, Canada. The Delta(14)C dissolved inorganic (DIC) was constant throughout water column consistent a primarily atmospheric source. Observed depletions DIC (14)C values compared CO(2) indicated effects due either to residence time and/or inputs (14)C-depleted groundwater....
The objectives of this study are two-fold: (1) to describe and quantify the seasonal physical chemical limnological properties Pavilion Lake, a microbialite-rich lake in British Columbia, Canada, (2) gain broader context Lake by examining limnology hydrology lakes groundwater systems area (∼30 km radius). is dimictic with annual ice-cover. It hard water (mean CaCO 3 = 181.8 mg L -1), ultra-oligotrophic Total Phosphorus [TP] 3.3 μg -1) lake, that fed most likely through diffuse, low velocity...
Abstract The catastrophic August 2014 Mount Polley tailings spill, the second largest ever documented, sent ~18 Mm 3 of waste plunging to bottom >100 m deep West Basin Quesnel Lake, British Columbia, a critical Coast salmon habitat. To understand impact spill on lake, including fate suspended solids, we examine changes in physical water properties over 11 years (2006–2017) using column profiles, moored timeseries, and satellite imagery. Contaminated waters were initially largely confined...
Abstract Quantitative tools for deciphering the environment of microbialite formation are relatively limited. For example, oxygen isotope carbonate‐water geothermometer requires assumptions about isotopic composition water formation. We explored utility using ‘clumped’ thermometry as a tool to study temperatures studied microbialites recovered from depths 10–55 m in Pavilion Lake, and 10–25 Kelly spanning thermocline both lakes. determined temperature carbonate growth 18 O/ 16 O ratio waters...
Observations of a cyclonic gyre in an ice‐covered, midsize (< 5 km 2 ), temperate lake are presented. Horizontal and vertical measurements temperature electrical conductivity were collected using conductivity‐temperature‐depth logger mounted on autonomous underwater vehicle additional instrumentation. These revealed cylindrical density anomaly with radius ∼110 m extending from the surface to ∼14 depth. The observed is smaller than internal Rossby deformation (∼ 200 m), which suggests...
Abstract The exchange of heat and freshwater between glaciers the ocean is dictated by circulation in glacial fjords ice shelf cavities. Therefore, our ability to estimate predict these fluxes depends on understanding mechanisms inside polar estuaries. Here, we use an exceptionally long observational data set (8+ years) develop validate a high‐resolution realistic numerical model Milne Fiord (Nunavut, Canada), fjord with at its mouth. Model results show from 2011 2019 highly...