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Notes on “Impacts of the small-scale filaments on the oceanic vertical pump” by Lapeyre and Klein (2006)

  • In their numerical simulations, filaments outside eddies (“elongated filaments”) cover 57% of the total area (see their Table 1), contribute to only 6% of the temperature anomaly, but to 35% and 47% of the vertical velocity and tracer in the upper 100 m.
  • The tracers found in elongated filaments are mostly due to vertical transport, not horizontal one.
  • They give a simple expression for the vertical velocity based on scaling that could be used for our analysis of the data at and around station ALOHA.
  • One important conclusion that I draw is that filaments, that can be detected by FSLE, could account for about 60-70% of the total input of nutrients in the surface layer. That also means that 30-40% of the input is due to mesoscale eddies that are not recognized by FSLE.
  • Given T/P SSH, deduce the vertical velocity (using Surface Quasi-geostrophy theory) and the total input expect at station ALOHA. Compared with observations.