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by Waldman, R., Somot, S., Herrmann, M., Sevault, F. and Isachsen, P. E.
Abstract:
Chaotic intrinsic variability is a fundamental driver of the oceanic variability. Its understanding is key to interpret observations, evaluate numerical models and predict the future ocean and climate. Here we study intrinsic variability of deep convection in the Northwestern Mediterranean Sea using an ensemble eddy-resolving hindcast simulation over the period 1979-2013. We find that the variability of deep convection is mostly forced but also, to a considerable extent, intrinsic. The intrinsic variability can dominate the total convection variability locally and over a single winter. It also makes up a significant fraction of its interannual variability but has only modest impacts on the long-term mean state. We find that the occurrence of deep convection is random 18% of years at the basin-scale, and 29% locally at the LION observational site. Spatially, the intrinsic variability is highest far from the continental shelf. We relate this pattern to baroclinic instability theory that takes bottom stabilization into account.
Reference:
Waldman, R., Somot, S., Herrmann, M., Sevault, F. and Isachsen, P. E., 2018: On the chaotic variability of deep convection in the Mediterranean SeaGeophysical Research Letters, 45, 2433-2443.
Bibtex Entry:
@Article{Waldman2018,
  Title                    = {On the chaotic variability of deep convection in the Mediterranean Sea},
  Author                   = {Waldman, R. and Somot, S. and Herrmann, M. and Sevault, F. and Isachsen, P. E.},
  Journal                  = {Geophysical Research Letters},
  Year                     = {2018},

  Month                    = {March},
  Number                   = {5},
  Pages                    = {2433-2443},
  Volume                   = {45},

  Abstract                 = {Chaotic intrinsic variability is a fundamental driver of the oceanic variability. Its understanding is key to interpret observations, evaluate numerical models and predict the future ocean and climate. Here we study intrinsic variability of deep convection in the Northwestern Mediterranean Sea using an ensemble eddy-resolving hindcast simulation over the period 1979-2013. We find that the variability of deep convection is mostly forced but also, to a considerable extent, intrinsic. The intrinsic variability can dominate the total convection variability locally and over a single winter. It also makes up a significant fraction of its interannual variability but has only modest impacts on the long-term mean state. We find that the occurrence of deep convection is random 18% of years at the basin-scale, and 29% locally at the LION observational site. Spatially, the intrinsic variability is highest far from the continental shelf. We relate this pattern to baroclinic instability theory that takes bottom stabilization into account.},
  Copublication            = {5: 4 Fr, 1 No},
  Doi                      = {10.1002/2017GL076319},
  ISSN                     = {1944-8007},
  Keywords                 = {Climate and interannual variability, Marginal and semi-enclosed seas, Hydrodynamic modeling, Topographic/bathymetric interactions, Turbulence, diffusion, and mixing processes, Deep convection, Intrinsic ocean variability, Ocean modelling, Baroclinic instability, Mediterranean Sea},
  Owner                    = {hymexw},
  Timestamp                = {2018.08.27},
  Url                      = {http://dx.doi.org/10.1002/2017GL076319}
}