Dany Dumont

Dany Dumont
Université du Québec à Rimouski UQAR | uqar · Institut des Sciences de la Mer de Rimouski (ISMER)

PhD

About

149
Publications
30,063
Reads
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1,515
Citations
Citations since 2017
77 Research Items
1138 Citations
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Introduction
I'm primarily interested by polar seas and sea ice-related phenomena such as polynyas, landfast ice, wave-ice interactions, the marginal ice zones, but I keep an open mind and dive into many more subjects where marine physics is involved. I use many kinds of observational data and methods to inform intuition, build models and test them. I use the St. Lawrence Estuary as a natural laboratory that I access and observe with ice canoes, autonomous time-lapse cameras, drifting buoys and a curious and creative mind.
Additional affiliations
July 2009 - December 2010
Nansen Environmental and Remote Sensing Center
Position
  • PostDoc Position
Education
September 2004 - December 2009
Institut national de la recherche scientifique, Centre Eau, Terre et Environnement
Field of study
  • Physical Oceanography
September 2000 - January 2002
Laval University
Field of study
  • Physics

Publications

Publications (149)
Article
Full-text available
High-frequency radars (HFR) measure ocean surface currents remotely through the Bragg-scattering of radio waves by surface gravity waves with wavelengths shorter than 50 meters. HFR range is affected by sea ice, which dampens surface gravity waves and limits wind fetch for adjacent open waters. HFR range sensitivity to sea ice concentration was emp...
Article
Full-text available
The Gulf of St Lawrence is under immediate pressure for oil and gas exploration, particularly at the Old Harry prospect. A synthesis of the regulatory process that has taken place over the last few years indicates that important societal decisions soon to be made by various ministries and environmental groups are going to be based on numerous disag...
Article
Full-text available
A high-resolution sea ice-ocean numerical model of the North Water polynya has been developed to study the wind-driven circulation during polynya events. An idealized three-layer stratified ocean is used to initialize the model to characterize the baroclinic response to realistic wind and ice conditions. The model general circulation pattern is mai...
Article
Full-text available
The marginal ice zone (MIZ) is the boundary between the open ocean and ice‐covered seas, where sea ice is significantly affected by the onslaught of ocean waves. Waves are responsible for the breakup of ice floes and determine the extent of the MIZ and floe size distribution. When the ice cover is highly fragmented, its behavior is qualitatively di...
Article
A new method is developed to evaluate the wave climate in the Gulf of St. Lawrence (GSL) with the consideration of wave attenuation by sea ice. Ice concentrations outputs from a regional oceanic model are used to attenuate, in post-processing, significant wave height (Hs) time-series simulated with a parametric wave model for ice-free conditions. R...
Presentation
Full-text available
Here we compare the diffusivity estimated from drifters with the one estimated from aerial photographies and by using a strain-diffusion model. Results highly suggest that taking into account the strain (or large scale deformation) reduce the diffusivity by a factor between 2 and 5. If so, it is possible that the estimation of diffusivity by using...
Article
Full-text available
Seasonal and tidal variability of temperature, salinity, and currents were measured from spring to fall 2017, and during spring 2018 in the Bay of Sept-Îles (BSI), located in the northwest of the Gulf of St. Lawrence, Canada. Surface drifters were deployed to measure surface current velocities and CTD profiles were recorded regularly at 21 stations...
Article
Full-text available
The Green Edge project was designed to investigate the onset, life, and fate of a phytoplankton spring bloom (PSB) in the Arctic Ocean. The lengthening of the ice-free period and the warming of seawater, amongst other factors, have induced major changes in Arctic Ocean biology over the last decades. Because the PSB is at the base of the Arctic Ocea...
Article
With the increasing resolution of operational forecasting models, the marginal ice zone (MIZ), the area where waves and sea ice interact, can now be better represented. However, the proper mechanics of wave propagation and attenuation in ice, and especially their influence on sea ice dynamics, still remain poorly understood and constrained in model...
Article
Despite enormous scientific and technological progress in numerical weather and climate prediction, sea ice still remains unreliably predicted by models, both in short-term forecasting and climate projection applications. The total ice extent in both hemispheres is tied to the location of the ice edge, and consequently to what happens in the portio...
Article
Rhodamine water tracer (RWT) released during the 2021 Tracer Release Experiment in the St. Lawrence Estuary provides a proxy for the water-soluble fractions of contaminant spills. Measurements of total and size-resolved aerosols were taken onboard a research vessel throughout the experiment. Size-resolved aerosol measurements show airborne transmis...
Article
Full-text available
Landfast ice is a common coastal feature in the Arctic Ocean and around the Antarctic continent. One contributing and stabilizing mechanism is the grounding of sea ice ridges in shallow water. Recently, a grounding scheme representing this effect on sea ice dynamics was developed in order to improve the simulation of landfast ice by continuum-based...
Article
High-frequency radars (HFR) remotely measure ocean surface currents based on the Doppler shift of electromagnetic waves backscattered by surface gravity waves with half the electromagnetic wavelength, called Bragg waves. Their phase velocity is affected by their interactions with the mean Eulerian currents and with all the other waves present at th...
Article
Full-text available
Background. Despite the abundance and proximity of edible marine resources, coastal communities along the St. Lawrence in Eastern Québec rarely consume these resources. Within a community-based food sovereignty project, Manger notre Saint-Laurent ("Sustenance from our St. Lawrence"), members of participating communities (3 non-Indigenous, 1 Indigen...
Preprint
The Green Edge project was designed to investigate the onset, life and fate of a phytoplankton spring bloom (PSB) in the Arctic Ocean. The lengthening of the ice-free period and the warming of seawater, amongst other factors, have induced major changes in arctic ocean biology over the last decades. Because the PSB is at the base of the Arctic Ocean...
Preprint
Full-text available
We provide the first in situ observations of floe size distributions (FSD) resulting from wave-induced sea ice break-up. In order to obtain such data, an unmanned aerial vehicle was deployed from the Canadian Coast Guard Ship Amundsen as it sailed in the vicinity of large ice floes in Baffin Bay and in the St. Lawrence Estuary, Canada. When represe...
Preprint
In some coastal regions of the Arctic Ocean, as well as in shallow seasonally ice-covered seas, grounded ice ridges contribute to stabilizing and maintaining a landfast ice cover. Recently, a grounding scheme representing this effect on sea ice dynamics was introduced and tested in a coupled ice-ocean model. This grounding scheme, based on a parame...
Article
Full-text available
A simplified model, representing the dynamics of marine organic particles in a given size range experiencing coagulation and fragmentation reactions, is developed. The framework is based on a discrete size spectrum on which reactions act to exchange properties between different particle sizes. The reactions are prescribed according to triplet inter...
Technical Report
Full-text available
This project aims at developing a numerical method to assimilate HF radars real-time surface currents of the LSLE into operational models (e.g. CIOPS-E) of En- vironment and Climate Change Canada (ECCC). It has 3 main objectives : validation, evaluation and assimilation.
Preprint
Full-text available
A simplified model, representing the dynamics of marine organic particles in a given size range experiencing coagulation and fragmentation reactions is developed. The framework is based on a discrete size spectrum on which reactions act to exchange properties between different particle sizes. The reactions are prescribed according to triplets inter...
Article
Full-text available
The importance of explicitly resolving the Stokes drift in ocean surface drift modelling is demonstrated by comparing four models with 58,612 observational data points obtained from undrogued drifting buoys in the Estuary and Gulf of St. Lawrence, Canada. Drift model inputs are obtained from regional atmosphere and ocean circulation, and spectral w...
Article
Climate changes in the Arctic may weaken the currently tight pelagic-benthic coupling. In response to decreasing sea ice cover, arctic marine systems are expected to shift from a ‘sea-ice algae–benthos' to a ‘phytoplankton-zooplankton’ dominance. We used mollusc shells as bioarchives and fatty acid trophic markers to estimate the effects of the red...
Preprint
Background: Despite the abundance and proximity of edible marine resources, coastal communities along the St. Lawrence in Eastern Quebec rarely consume these resources. Within a community-based food sovereignty project, Manger notre Saint-Laurent (Sustenance from our St. Lawrence), members of participating communities (three non-Indigenous, one Ind...
Article
Full-text available
A 130 km2 tabular iceberg calved from Petermann Glacier in northwestern Greenland on 5 August 2012. Subsequent fracturing generated many individual large “ice islands”, including Petermann ice island (PII)-A-1-f, which drifted between Nares Strait and the North Atlantic. Thinning caused by basal and surface ablation increases the likelihood that th...
Poster
The ocean biological pump transports organic carbon produced in surface waters to the seafloor, where it can be sequestered in the sediments or consumed by benthic organisms. Aggregates constitute an important fraction of the organic matter in the ocean. However, only few biogeochemical models include the formation of aggregates (i.e. coagulation),...
Poster
Full-text available
Wave-ice interactions affect sea ice dynamics and must be adequately represented in numerical models in order to improve predictability, especially in a context of ice receding and thinning. How wave energy attenuates and redistributes when propagating in ice-covered seas have been studied for many decades. However, our current understanding relies...
Preprint
Full-text available
Abstract. A simple parameterization of zooplankton vertical swimming is proposed as a way to reproduce the diel vertical migration (DVM) behavior, which refers to the daily descent of aquatic organisms hundreds of meters below the surface at dawn and their return to the surface at dusk, a phenomenon that is widespread among most zooplankton species...
Poster
Full-text available
This poster is about sea ice breakup observations made in the Saint-Lawrence River at winter 2019 and in the Canadian Arctic at summer 2019. The NGCC Amundsen was used to generate waves in the vicinity of vast sea ice floes in order to partly break them. A drone was used to record the breakup process at a high resolution. In the end, results show t...
Article
Full-text available
The Green Edge initiative was developed to investigate the processes controlling the primary productivity and fate of organic matter produced during the Arctic phytoplankton spring bloom (PSB) and to determine its role in the ecosystem. Two field campaigns were conducted in 2015 and 2016 at an ice camp located on landfast sea ice southeast of Qikiq...
Article
Observations of waves, winds, turbulence, and the geometry and circulation of windrows were made in a shallow bay in the winter of 2018 outside of Rimouski, Québec. Water velocities measured from a forward-looking pulse-coherent ADCP mounted on a small zodiac show spanwise (cross-windrow) convergence, streamwise (downwind) velocity enhancement, and...
Article
Empirical models of wave runup are commonly derived from open beaches, but their applicability in fetch-limited, sheltered environments are yet to be properly assessed. Based on original video-derived runup observations on 5 beaches with distinct morphodynamic states in the Estuary and Gulf of St. Lawrence (EGSL), this paper presents a runup analys...
Article
Full-text available
The Green Edge initiative was developed to investigate the processes controlling the primary productivity and the fate of organic matter produced during the Arctic phytoplankton spring bloom (PSB) and to determine its role in the ecosystem. Two field campaigns were conducted in 2015 and 2016 at an ice camp located on landfast sea ice southeast of Q...
Article
Full-text available
Predictions of drift trajectories based on four drift models were compared with observations from drifting buoys deployed in 2014 and 2015 in the Estuary and Gulf of St. Lawrence to show the impact of the current vertical shear on the surface drift predictions. Input of ocean currents and winds are obtained from ISMER's 5 km resolution ocean circul...
Article
Full-text available
Arctic sea ice is experiencing a shorter growth season and an earlier ice melt onset. The significance of spring microalgal blooms taking place prior to sea ice breakup is the subject of ongoing scientific debate. During the Green Edge project, unique time-series data were collected during two field campaigns held in spring 2015 and 2016, which doc...
Raw Data
This 5 cm resolution orthomosaïc was made by stitching together multiple images took after a wave-induced sea ice breakup experiment in the Northern Baffin Bay. The CCGS Amundsen generated waves in the vicinity of the ice floe for breakup to happen. This image has been used to calculate the floe size distribution (FSD) directly resulting from wave-...
Article
Full-text available
A 130 km² tabular iceberg calved from Petermann Glacier in northwest Greenland on 5 August 2012. Subsequent fracturing generated many individual large “ice islands”, including “Petermann Ice Island (PII)-A-1-f”, that drifted between Nares Strait and the North Atlantic. Thinning caused by basal and surface ablation increases the likelihood that thes...
Poster
Full-text available
Understanding how floating objects, including sea ice and fluids, drift and disperse at the ocean’s surface is critical for the safety of operations but also for preparing and adapting to the risk of marine hazards. The first motivation of this project was the recognition that drift models used operationally in Canada in support of search and rescu...
Article
Full-text available
During summer, phytoplankton can bloom in the Arctic Ocean, both in open water and under ice, often strongly linked to the retreating ice edge. There, the surface ocean responds to steep lateral gradients in ice melt, mixing, and light input, shaping the Arctic ecosystem in unique ways not found in other regions of the world ocean. In 2016, we samp...
Poster
The ocean biological pump transports organic carbon produced in surface waters to the seafloor, where it can be sequestered in the sediments or consumed by benthic organisms. This last process is part of the commonly called bentho-pelagic coupling (BPC), which in certain environments controls the abundance and composition of benthic communities. Ag...
Presentation
The ocean biological pump transports organic carbon produced in surface waters to the seafloor, where it can be sequestered in the sediments or consumed by benthic organisms. This last process is part of the commonly called bentho-pelagic coupling (BPC), which in certain environments controls the abundance and composition of benthic communities. Ag...
Raw Data
This video is the raw footage of a wave-induced breakup experiment made in the Gulf of Saint-Lawrence on February 7 2019. Waves were generated by the Canadian Coast Guard Ship Amundsen and the footage was captured by a DJI Mavic 2 Pro. A paper analyzing both the FSD and the breakup evolution of this experiment is in preparation.
Data
This orthomosaïc has a resolution of 3.1 cm/px and is constructed from video frames taken by a drone after the breakup experiment. It thus shows a part of the resulting breakup. This image has been used to calculate the floe size distribution (FSD) directly resulting from wave-induced breakup. Both water and the unbroken floe have been removed from...
Article
Full-text available
Coastal management often relies on large-scale flood mapping to produce sea level rise assessments where the storm-related surge is considered as the most important hazard. Nearshore dynamics and overland flow are also key parameters in coastal flood mapping, but increase the model complexity. Avoiding flood propagation processes using a static flo...
Article
Full-text available
Known for its high biological productivity, San Jorge Gulf (SJG) in Argentinian Patagonia is also an area of oil exploitation. To understand the dynamics of the SJG plankton ecosystem under several scenarios of potential hydrocarbon (HC) contamination, we present an 11-compartment biogeochemical model coupled to a turbulence model. In the coupled m...
Chapter
Full-text available
Arctic marine ecosystems provide numerous benefits and services of economic, societal and ecological value, including the provision of food resources, the conservation of biodiversity, carbon storage and nutrient recycling, among others. The Arc3Bio project combines the multidisciplinary skills of several experts to evaluate how climate variability...
Chapter
Full-text available
Arctic marine ecosystems provide numerous benefits and services of economic, societal and ecological value, including the provision of food resources, the conservation of biodiversity, carbon storage and nutrient recycling, among others. The Arc3Bio project combines the multidisciplinary skills of several experts to evaluate how climate variability...
Chapter
Full-text available
The marine ecosystem of the Eastern Canadian Arctic is shaped by a combination of remote and regional processes that affect freshwater loading, nutrient supply and ratios, acidification, and ice dynamics. Remote drivers include the inflow of waters from the Pacific Ocean and rivers, as well as their transformations in transit toward eastern Baffin...
Article
Since the early 1990s phytoplankton has been studied and monitored in Potter Cove (PC) and Admiralty Bay (AB), King George/25 de Mayo Island, South Shetlands. Phytoplankton biomass is typically low compared to other Antarctic shelf environments, with average spring - summer values below 1 mg chlorophyll a m-3. The physical conditions in the area (r...
Poster
Pour représenter la dynamique de sédimentation des particules organiques dans la colonne d’eau dans les modèles biogéochimiques couplés à un environnement physique, tenir compte des mécanismes de collision-adhésion des particules est essentiel. Un modèle de traceurs évoluant dans un environnement physique 1-D incluant les principaux mécanismes de f...
Article
Full-text available
Coastlines along the St. Lawrence Estuary and Gulf, Eastern Canada, are under increasing risk of flooding due to sea level rise and sea ice shrinking. Efficient and validated regional‐scale coastal flood mapping approaches that include storm surges and waves are hence required to better prepare for the increased hazard. This paper compares and vali...
Article
Full-text available
Phytoplankton dynamics models follow either an Eulerian or a Lagrangian approach. The Eulerian formulation assumes that all individuals of a population living in homogeneous environmental conditions, i.e. within a model grid cell, are in a single average physiological state, which generally depends on local conditions. By tracking each individual c...
Article
Full-text available
Wind waves may play an important role in the evolution of sea ice. That role is largely determined by how fast the ice layer dissipates the wave energy. The transition from a continuous layer of ice to a series of broken floes is expected to have a strong impact on the several at-tenuation processes. Here we explore the possible effects of basal fr...
Article
Ocean surface wave radiation stress represents the flux of momentum due to the waves. When waves are dissipated or reflected by sea ice, that momentum is absorbed or reflected, resulting in a horizontal forcing that frequently compresses the ice. In this work, wave radiation stress is used to estimate the compressive force applied by waves to the m...
Article
Rivers’ damming disrupts the seasonal cycle of freshwater and nutrient inputs into the marine system, which can lead to changes in coastal plankton dynamics. Here we use a 3-D 5-km resolution coupled biophysical model and downscale it to a 400-m resolution to simulate the effect of damming the Romaine River in Québec, Canada, which discharges on av...
Poster
The ocean biological pump transports organic carbon produced in surface waters to the seafloor, where it can be consumed by benthic organisms. This last process is part of the commonly called bentho-pelagic coupling (BPC), which in certain environments controls the abundance and composition of benthic communities. Aggregates are an important fracti...
Presentation
The ocean biological pump transports organic carbon produced in surface waters to the seafloor, where it can be consumed by benthic organisms. This last process is part of the commonly called bentho-pelagic coupling (BPC), which in certain environments controls the abundance and composition of benthic communities. Aggregates are an important fracti...