Roos Bol – Graduate Student
NIOZ Royal Netherlands Institute for Sea research & Utrecht University
OSNAP Advisor: Femke de Jong
In February 2018 I started my PhD with my supervisor Femke de Jong . The goal of my project is to analyze the variability of the Irminger Current, the northward boundary current in the eastern Irminger Sea. The northward heat and freshwater transport of this current display strong variatiability on subseasonal to interannual scales. In my project, I will investigate what causes this variability, and try to relate this to the role of the boundary current within the framework of the larger AMOC. To achieve this, I will focus on observational data from the Irminger Sea, such as moorings, hydrographic sections and altimetry.
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.
While the overall pattern of northward heat transport throughout the South Atlantic basin has been understood for many decades, the contributing pathways are still an area of active research. My work focuses on understanding the sources of the AMOC return flow in the South Atlantic and its adjacent basins. Specifically, I am interested in exploring upper-ocean pathways, heat and freshwater fluxes, and the connectivity between the South and North Atlantic. I use a combination of observational data, such as surface drifters and subsurface floats, as well as ocean circulation models (e.g. HYCOM) in my research.
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’m analyzing the exchange of freshwater from the Greenland shelf into the Labrador Sea. The goal of this project is to determine how glacial meltwater from Greenland affects convection in the Labrador Sea.
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.
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.
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.
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.
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 – Postdoc
OSNAP Advisor: Susan Lozier
As part of the OSNAP project, my research focuses on understanding what drives the mean overturning circulation and its large variability across OSNAP-East. Indeed, the seasonal and interannual variability of the AMOC cannot be solely explained by the variability of the Labrador Sea Water formation as observed at OSNAP-West or by the inflow across the Greenland-Scotland Ridge (GSR) at depth. By using monthly observations from the OSNAP array and from moorings located along the GSR, I show that the mechanisms explaining this variability are also related to the formation of Subpolar Mode Water between the ridge and the OSNAP-East line, forced by air-sea fluxes, which is then entrained in the lower limb of the MOC. Another work will focus on the propagation and connection between the subpolar and the subtropical gyres by using observations along the RAPID array.
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.