A5083288721- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Marine and coastal ecosystems
- Geology and Paleoclimatology Research
- Geological Studies and Exploration
- Arctic and Russian Policy Studies
- Marine Biology and Ecology Research
- Oceanographic and Atmospheric Processes
- Atmospheric and Environmental Gas Dynamics
- Isotope Analysis in Ecology
- Marine and fisheries research
- Indigenous Studies and Ecology
- Ocean Acidification Effects and Responses
- Climate change and permafrost
- Microbial Community Ecology and Physiology
- Geological formations and processes
- Maritime Navigation and Safety
- Maritime Transport Emissions and Efficiency
- Marine and Offshore Engineering Studies
- Coastal and Marine Management
- Polar Research and Ecology
- Delphi Technique in Research
- Soil Geostatistics and Mapping
- Marine Biology and Environmental Chemistry
- Maritime and Coastal Archaeology
Université Laval
2011-2020
Centre National de la Recherche Scientifique
2011-2017
Golder Associates (Canada)
2014-2016
Takuvik Joint International Laboratory
2012-2015
Ifremer
1996-2011
Institut National de la Recherche Scientifique
2010-2011
UiT The Arctic University of Norway
2009-2010
Abstract Arctic Ocean microbial eukaryote phytoplankton form subsurface chlorophyll maximum (SCM), where much of the annual summer production occurs. This SCM is particularly persistent in Western Ocean, which strongly salinity stratified. The recent loss multiyear sea ice and increased particulate-rich river discharge results a greater volume fresher water that may displace nutrient-rich saltier waters to deeper depths decrease light penetration areas affected by discharge. Here, we...
As part of the Canadian Arctic Shelf Exchange Study (CASES), we assessed importance new production and resuspension in determining nature magnitude deep (210 m) particulate organic carbon (POC) flux from October 2003 to September 2004 central Franklin Bay. In spring summer, phytoplankton was nutrient‐limited stratified surface layer initial bloom evolved into a subsurface chlorophyll maximum (SCM) at nutricline. Large herbivorous calanoid copepods intercepted little but grazed intensely on...
Abstract The contiguous Arctic shelf is the green belt of Ocean. Phytoplankton dynamics in this environment are driven by extreme physical gradients and rapid climate change, which influence light nutrient availability as well growth ecological characteristics phytoplankton. A large dataset collected across Canadian Beaufort Shelf during summer 2009 was analyzed to assess how interplay biogeochemical conditions dictates phytoplankton niches trophic regimes. Nonmetric multidimensional scaling...
Abstract Heavy ice conditions along Canada's east coast during spring 2017 presented hazardous for the maritime industry and required Canadian Coast Guard to pull its research icebreaker, CCGS Amundsen , off scientific cruise provide escort services conduct search rescue operations Newfoundland's northeast coast. Greater concentrations a thicker pack than are typical of this area created anomalous cover. Within paper we present in situ observations cover, confirming that pieces multiyear sea...
Calanoid copepods dominate mesozooplankton biomass in the Arctic Ocean. Variations C content, C:N ratio and stable isotope composition (δ13C, δ15N) of Calanus hyperboreus, glacialis Metridia longa collected from January to August 2008 southeast Beaufort Sea provided insights into their metabolism, feeding reproduction. Seasonal differences C–prosome length relationships ratios were driven by distinct spawning strategies changes lipid content. Relatively high copepod over study period...
Typically, all undecomposed metazoans found in formalin‐poisoned cups of sediment traps are considered to be active intruders (or “swimmers”) and removed prevent an overestimation the downward particle flux. However, intact dead before entering trap should included estimation flux carbon. Arctic copepods collected field were killed either by formalin mimic death actively swimming into cups, or crowding high temperature then preserved simulate trap. In heat treatments, 64% Calanus hyperboreus...
Abstract. The lipid content of seven samples sinking particles collected with sediment traps moored at ~ 100 m depth in summer and fall across the Canadian Beaufort Shelf (Arctic Ocean) was investigated. Our main goal to quantify characterize biotic abiotic degradation processes that acted on material during these periods. Diatoms, which dominated phytoplanktonic assemblage every trap sample, appeared be remarkably sensitive Type II (i.e. involving singlet oxygen) photodegradation summer,...
Abstract. A better understanding of how environmental changes affect organic matter fluxes in Arctic marine ecosystems is sorely needed. Here we combine mooring times series, ship-based measurements and remote sensing to assess the variability forcing factors vertical particulate carbon (POC) across Mackenzie Shelf 2009. We developed a geospatial model these proceed an integrative analysis their determinants summer. Flux data were obtained with sediment traps moored around 125 m via regional...
In the Arctic Ocean, vertical fluxes of particulate organic carbon (POC) remain low during dark winter period because POC are derived from photosynthetic production. Passively sinking dead copepods traditionally excluded estimated using sediment traps, resulting in underestimation total flux. Here, we present seasonal variability export flux measured by a trap moored at ∼ 100 m Amundsen Gulf (southeastern Beaufort Sea) over October 2007‐July 2008. Surprisingly, integrated for February (466...
Abstract. The effects of climate change on Arctic marine ecosystems and their biogeochemical cycles are difficult to predict given the complex physical, biological chemical interactions among ecosystem components. We studied benthic fluxes in influence short-term (seasonal annual), long-term (annual decadal) other environmental variability spatial distribution provide a baseline for estimates impact future changes. In summer 2009, we measured dissolved oxygen, nitrate, nitrite, ammonia,...
Abstract. The size distribution and mean spatial trends of large particles (>100 μm, in equivalent spherical diameter, ESD) mesozooplankton were investigated across the Mackenzie Shelf (Southeast Beaufort Sea, Arctic Ocean) July–August 2009. Our main objective was to combine results from an Underwater Vision Profiler 5 (UVP5) traditional net tows (200 μm mesh size) characterize structural diversity functioning shelf-basin ecosystem assess large-scale correspondence between two...
Abstract The shelfbreak current over the Beaufort Sea continental slope is known to be one of most energetic features hydrography. In January 2005, three oceanographic moorings deployed Canadian (eastern) simultaneously recorded two consecutive events with along‐slope eastward bottom‐intensified flow up 120 cm s −1 . Both were generated by local wind forcing associated Pacific‐born cyclones passing north toward Archipelago. Over mooring array, westerly exceeded 15 m These storm surges along...
Abstract. As part of the international, multidisciplinary project Malina, downward particle fluxes were investigated by means a drifting multi-sediment trap mooring deployed at three sites in Canadian Beaufort Sea late summer 2009. Mooring deployments lasted between 28 and 50 h targeted shelf-break slope along Beaufort-Mackenzie continental margin, as well edge Mackenzie Shelf Amundsen Gulf. Besides analyses C N, collected material was for pigments, phyto- microzooplankton, faecal pellets...