My background is ecosystem biology, and withing Dr. Myers’s physical oceanographic modelling group I study primary productivity in the Labrador Sea, as well as the evolution of oxygen and carbon concentration in the Labrador Sea Water using a state of the art ocean sea-ice model (NEMO) coupled to a biogeochemical model (BLING). The simulation runs from 1958 to 2013.
Elizabeth Comer – Graduate Student
National Oceanography Centre and University of Southampton
OSNAP Advisor: Penny Holliday
We will be examining the internannual variability of volume, heat and freshwater transport as observed by the Extended Ellett Line since 1996, decomposing the net transport into various components of the overturning circulation. We will examine the changes in the light of present understanding about the response of the subpolar gyre to local and remote mechanical and buoyancy forcing. We will critically examine whether the results support those hypotheses and identify other mechanisms at work. We will use data from across the subpolar gyre and high resolution models to test our hypotheses.
I am doing a post-doc at University of Alberta. My post-doc is part of the VITALS (Ventilation, Interactions and Transports Across the Labrador Sea) project. I am investigating changes in the Labrador Sea Water formation and how it is linked to the Meridional Overturning Circulation (MOC). For my investigations, I mostly use ocean simulations from the NEMO framework.
I started working on the OSNAP project in January 2018. I use a combination of moorings, gliders and numerical model output to estimate the transport in the eastern sub-polar North Atlantic. I also use inverse methods to study the large scale North Atlantic circulation as well as decadal trends in temperature and salinity.
Yarisbel Garcia Quintana – Graduate Student
University of Alberta
OSNAP Advisor: Paul G. Myers
By using an ocean-sea ice coupled numerical model (NEMO), my research has been focused on Labrador Sea Water (LSW) formation rate variability as well as AMOC strength under different scenarios, by implementing sensitivity experiments. I have been working with Paul G. Myers as my Supervisor. Part of my research also aims to look at the variability and formation rates of the Denmark Strait Overflow Water (DSOW) and Iceland-Scotland Overflow Water (ISOW). LSW, DSOW and ISOW contributions to the AMOC strength and variability in the sub-polar gyre is also one of my questions.
My PhD project aims to understand deep transport variabilities from Model and Observational data. It focuses on the mechanisms causing variabilities on different timescales in the deep limb of the overturning circulation. What are the connections of changes in regional wind stress curl, hydrographic and dynamic properties in NADW and its single components LSW, NEADW and ISOW? Also the evolution of deep water masses traveling from their source region in the north down south is a field of interest. I am trying to answer these questions via model analysis of the high resolution model VIKING20 and the analysis of observational data from different locations in the North Atlantic.
Loïc Houpert – Postdoc
Scottish Association for Marine Sciences, Oban
OSNAP Advisor: Stuart Cunningham & Mark Inall
The purpose of my job is to support the physical oceanographic observations being made as part of UK-OSNAP and to undertake scientific research with those observations in collaboration with national and international partners. Particularly I am involved in the planning and execution of the UK mooring and glider programme.
Moorings and gliders will be used to measure volume, heat and salt flux in the eastern gyre.
I am working with numerical modelling (the VITALS project), focusing the arctic and subarctic freshwater processes, e.g., sea ice, runoff and Greenland meltwater, and their impacts on the oceanic physics. It’s very interesting (also important) to see how/how much the upstream freshwater flow down to south, their role in Labrador Sea deep convection and large-scale Atlantic Meridional Overturning Circulation.
Greg Koman – PhD Student
Rosenstiel School of Marine and Atmospheric Science at University of Miami
OSNAP Supervisor: Bill Johns
My Ph.D. research is on the seasonal variability of the North Atlantic Subpolar Gyre (NASPG) and its boundary currents. Using multiple sources of evidence including altimetry, models, hydrographic data and mooring data, we find that many portions of the NASPG show an increased seasonal transport in the late fall and a weakened transport in the spring and summer. My research works to create a complete pictures of this variability and investigate the sources for its variation.
I use the MITgcm and its adjoint to study the response of the subpolar North Atlantic circulation to various sources of forcing: wind stress, heat fluxes, surface freshwater fluxes, as well as interior temperature and salinity anomalies observed by OSNAP. I furthermore explore the connectivity between the subpolar and the subtropical North Atlantic. I examine how anomalies at the OSNAP array exert a delayed effect on the strength of overturning at 26N.
My PhD project will examine how different atmospheric regimes affect the ocean heat storage and overturning in the North Atlantic Ocean and the wider climate system.
The prevailing view is that much of the ocean variability in heat storage in the North Atlantic is understood in terms of slowly varying climate modes, i.e. fixed pressure patterns such as the North Atlantic Oscillation. Instead we wish to explore how the ocean heat uptake and overturning is controlled by the position and frequency of individual weather systems, in particular atmospheric blocks, which determine the path of the jet stream.
Neill Mackay – Postdoc
National Oceanography Centre
OSNAP Advisor: Chris Wilson
Along with my supervisor Chris Wilson, I am developing a novel inverse method which will be applied in the North Atlantic to complement the OSNAP observations. The method is based on recent work in thermohaline coordinates, and uses a balance which exists between advective, diffusive and surface fluxes to gain information about the circulation. By combining observations of temperature and salinity at the open boundary of an enclosed volume (for example the Arctic ocean enclosed by a constant latitude section at 60N) with surface fluxes into the volume, the inverse method can determine the velocities through the interface and diffusive fluxes in the interior.
We are currently working on validating the inverse model using data from the 1 degree version of the NEMO forward ocean model. Once we have completed work refining the inverse method, we plan to apply it to climatological observations and diagnose the circulation and mixing for the OSNAP region. We will compare, and perhaps later combine our results with observations from the OSNAP moorings with the aim of enhancing our understanding of the circulation of the subpolar gyre.
Juliana M. Marson- Postdoc
University of Alberta
OSNAP Advisor: Paul G. Myers
I am a physical oceanographer who worked with Antarctic research in the past. As I wanted to gain more experience with Arctic research and numerical modelling, I came to Canada to work with Dr. Myers group. Currently, I am implementing an interactive iceberg module in our model and analyzing the importance of iceberg meltwater to the North Atlantic Ocean.
My research focuses on the kinematics of the West Greenland boundary current system. I am interested in characterizing the mesoscale and submesoscale variability in the system, as well as understanding the seasonality, transport, and governing dynamics of the boundary current.
The AMOC has long been appreciated as a pathway for heat and salt transport from the subtropical to subpolar gyre. Less appreciated is the role of the AMOC as a pathway for nutrient transport. My work focuses on determining the fate of tropical nutrients carried northward by the Gulf Stream, and how that throughput might impact primary productivity in the subtropical and subpolar gyres. I work primarily with historical datasets and remote sensing data, and am looking forward to incorporating the measurements of the AMOC made directly by the OSNAP array into my work.
My research focuses on the convection within the Labrador Sea. By using a numerical ocean model, NEMO, I examine some of the major influencing factors behind deep convection: atmospheric forcing over the convection region and freshwater transport into the convection region. I plan to couple an atmospheric model with NEMO to further explore sensitivity to atmospheric forcing.
Tillys Petit – Graduate Student
OSNAP Advisors: Virginie Thierry & Herlé Mercier
As part of my PhD, I’m studying the circulation around and over the Reykajnes Ridge (South of Island). The circulation will be quantified owing to an inverse model (and in-situ data measurements acquired along 4 sections in June 2015). As part of the RREX project, this study aims to identify the processes controlling the dynamical connections between the two sides of the ridge, which are characterized by a strong asymmetry of the properties, and the role of the major fractures zones in the circulation. The better understanding of current-topography interaction will help provide recommendations for the improvement of climate models, which tends to bring too much warm and salty water in the Irminger Sea.
Virginie Racapé – Postdoc
OSNAP Advisors: Virginie Thierry & Herlé Mercier
My job focuses on the deep-limb of the overturning circulation and the connection between subpolar and subtropical gyre. In this context, I am using Deep-Argo-O2 launched in the Subpolar gyre since 2015 to better document the deep circulation and its water masses as well as ventilation mechanism. This study will be completed by cruises data and Argo-O2 data available in the North Atlantic to better understand alternation between cold and warm periods observed since 1990s and their impact on the basin scale.