Woods Hole Oceanographic Institution

Julie Deshayes
Julie Deshayes's photoJulie Deshayes

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Research Interests
Influence of wave dynamics on the variability of the Meridional Overturning Circulation (MOC):
Idealized theoretical models give some insight on the influence of wave dynamics on the variability of the MOC driven by dense water formation in the North Atlantic. Low frequency basin modes do not seem to play a role in the forced oceanic response, but the equator acts as a buffer and dampens variability in the southern hemisphere and in other basins connected by a southern circumpolar channel.

Dense water formation in the North Atlantic:
One fundamental driver of the MOC is the formation of dense water in the subpolar gyre, which is exported via the Deep Western Boundary Current (DWBC). However the influence of convection on the DWBC depends on where convection occurred, especially how far away from the subpolar gyre boundary currents, as suggested from realistic simulations with General Circulation Models (GCM).

Mechanisms of variability in convective basins:
Dense water formed in the interior of a convective basin is exported to the surrounding boundary currents via turbulent fluxes resulting from different instabilities. The influence of atmospheric and remote oceanic forcings on these instabilities, hence on the characteristics of dense water export, can be investigated with idealized GCM configurations and conceptual models.

Interannual to decadal variability of the circulation in the North Atlantic:
Variability of the circulation in the North Atlantic and its link with atmospheric variability can be studied through realistic simulations with GCMs. Statistic diagnostics applied in such a simulation revealed that the circulation in the Irminger Sea, where heat fluxes and wind stress usually act in the same fashion, has a larger impact on the whole subpolar gyre and the MOC than that in the Labrador Sea.

Salinity and circulation in the North Atlantic:
Since 1950?s, freshwater content in the North Atlantic was maximum when the circulation was most intense, indicating that the salinity only played a passive role for the North Atlantic circulation. Restoring of the surface salinity, as applied in most GCM simulations forced by atmospheric reanalyses, impedes to investigate further on the influence of salinity on the circulation. Coupled climate models may help understanding better whether and on what timescales the salinity exerts an influence on the circulation.

Physical Oceanography:
- development of theoretical and conceptual models,
- analysis of realistic simulations with GCMs,
- realization of idealized configurations with MIT-GCM.

Computer sciences:
- programming languages: C, Fortran,
- Matlab,
- operating systems: Mac OS 10.3-4, Red Hat 4.

Human languages: French, English, Chinese, Spanish.

(2006) PhD in physical oceanography at Universite Paris VI (France), with honors, thesis: Influence of deep water formation on the variability of the meridional overturning circulation in the Atlantic Ocean, advisor: Prof. C. Frankignoul (LOCEAN, Paris).

(2003) Master Degree in oceanography, meteorology and environmental sciences at Universite Paris VI (France), with honors, master thesis: Theoretical study on the timescale of variability of the meridional overturning circulation, advisor: Prof. C. Frankignoul (LOCEAN, Paris).

(2003) Physical Engineer in fluid mechanics and oceanography, graduated from ENSTA (national institute for advanced technologies), Paris (France), one of the top 10 French engineering institutions; studying mathematics, physics (solid and fluid mechanics) and computer sciences.

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