Home About HyMeX
Motivations
Science questions
Observation strategy
Modelling strategy
Target areas
Key documents
Organisation
International coordination
Working groups
Task teams
National contributions
Endorsements
Resources
Database
Data policy
Publications
Education and summer schools
Drifting balloons (BAMED)
SOP web page
Google maps data visualisation
Workshops Projects
ASICS-MED
MOBICLIMEX
MUSIC
IODA-MED
REMEMBER
FLOODSCALE
EXAEDRE
PICS
Offers Links Contacts
Science & Task teams
Science teams
Task teams
Implementation plan
Coordination
International Scientific Steering Committee (ISSC)
Executive Committee for Implementation and Science Coordination (EC-ISC)
Executive Committee - France (EC-Fr)
HyMeX France
HyMeX Italy
HyMeX Spain
Archive
by Waldman, R., Brüggemann, N., Bosse, A., Spall, M., Somot, S. and Sevault, F.
Abstract:
For more than five decades, the Mediterranean Sea has been identified as a region of so-called thermohaline circulation, namely, of basin-scale overturning driven by surface heat and freshwater exchanges. The commonly accepted view is that of an interaction of zonal and meridional conveyor belts that sink at intermediate or deep convection sites. However, the connection between convection and sinking in the overturning circulation remains unclear. Here we use a multidecadal eddy-permitting numerical simulation and glider transport measurements to diagnose the location and physical drivers of this sinking. We find that most of the net sinking occurs within 50 km of the boundary, away from open sea convection sites. Vorticity dynamics provides the physical rationale for this sinking near topography: only dissipation at the boundary is able to balance the vortex stretching induced by any net sinking, which is hence prevented in the open ocean. These findings corroborate previous idealized studies and conceptually replace the historical offshore conveyor belts by boundary sinking rings. They challenge the respective roles of convection and sinking in shaping the oceanic overturning circulation and confirm the key role of boundary currents in ventilating the interior ocean.
Reference:
Waldman, R., Brüggemann, N., Bosse, A., Spall, M., Somot, S. and Sevault, F., 2018: Overturning the Mediterranean Thermohaline CirculationGeophysical Research Letters, 45, 8407-8415.
Bibtex Entry:
@Article{Waldman2018a,
  author        = {Waldman, R. and Brüggemann, N. and Bosse, A. and Spall, M. and Somot, S. and Sevault, F.},
  title         = {Overturning the Mediterranean Thermohaline Circulation},
  journal       = {Geophysical Research Letters},
  year          = {2018},
  volume        = {45},
  number        = {16},
  pages         = {8407-8415},
  abstract      = {For more than five decades, the Mediterranean Sea has been identified as a region of so-called thermohaline circulation, namely, of basin-scale overturning driven by surface heat and freshwater exchanges. The commonly accepted view is that of an interaction of zonal and meridional conveyor belts that sink at intermediate or deep convection sites. However, the connection between convection and sinking in the overturning circulation remains unclear. Here we use a multidecadal eddy-permitting numerical simulation and glider transport measurements to diagnose the location and physical drivers of this sinking. We find that most of the net sinking occurs within 50 km of the boundary, away from open sea convection sites. Vorticity dynamics provides the physical rationale for this sinking near topography: only dissipation at the boundary is able to balance the vortex stretching induced by any net sinking, which is hence prevented in the open ocean. These findings corroborate previous idealized studies and conceptually replace the historical offshore conveyor belts by boundary sinking rings. They challenge the respective roles of convection and sinking in shaping the oceanic overturning circulation and confirm the key role of boundary currents in ventilating the interior ocean.},
  copublication = {6: 3 Fr, 1 De, 1 No, 1 USA},
  doi           = {10.1029/2018GL078502},
  eprint        = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018GL078502},
  keywords      = {thermohaline circulation, overturning, sinking, Mediterranean Sea, vorticity balance, ocean modeling},
  owner         = {hymexw},
  timestamp     = {2019-01-25},
  url           = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018GL078502},
}