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Notes from AGU Ocean Sciences 2010

Notes

  • see Ivanov et al.’s paper on waves and jets
  • to follow westward-propagating features, use the Radon filter: see Maharaj et al. 2009, JGR.
  • subsurface submesoscale eddies: one mechanism would be a surface-trapped eddy interacting with a subsurface eddy (see Baker-Yeboah)
  • application of statistics: see Berliner et al. (2003, JGR)
  • Ayers and Loziers (JGR, 2010, in press): Ekman convergence zone follows Chl transition zone. Does the meridional shift of Chl follows the meridional shift of EKE?
  • Wunsch reiterates the importance of observing the deep ocean.
  • Oschlies:
    • large-scale export >> local direct measurements: due to time-scale? stoichometry conversion?
    • counter-argument against eddy-pumping:
      1. undersampling is unlikely; no reason to explain bias
      2. high estimates based on inconsistent model assumptions (see Siegel et al. 1999)
      3. use of nutrient-restoring model (McGillicudyy et al. 2003; Martin and Pondaven 2003): eddies are assumed to behave like waves, 100% of upwelled nutrients are consumed, water needs to be trapped in moving eddy (I do not understand this point).
    • lateral stirring >> vertical eddy contribution over a large art of subtropical gyre.
    • when eddies are resolved in a model, they also changed the thermostructure of the ocean, for instance the mixed layer, which makes the comparison with the non-eddy resolving model difficult.
  • See Nastrom and Gage for a spectrum analysis of submesoscale features in the atmosphere.
  • See Tulloch and Smith (2008, JAS), Ferrari and Rudnick (2000), and LeTraon et al. (2008) on spectrum slope for submesoscale processes.
  • Read Armi and Flament (1985) on the caution in interpretating spectrum in turbulent regime.

Ideas/Questions

Eddy-driven mean flow

  • Shallow water model forced with eddies from the east: what is the relationship between zonal and meridional Lagrangian transport and eddy dissipation?
  • Sensitivity of PV mixing region and associated meridional transport to dissipation.
  • Look at the changes of the meridional transport due to dissipation in the 3-layer model.
  • Meridional oscillating wind instead of oscillating PV curl?
  • Atmosphere: effect of dissipation in meridional transport. What is the literature? Read Holton (1980), Mo and McIntyre (1998), Meijers et al. (2007)
  • in the presentation of Sarmiento et al., presented by Jaime Palter: the stronger the Gent-McWilliams dissipation, the less the meridional transport.
  • Eddy stirring of tracers: see Smith and Ferrari (2009) and Taylor and Ferrari (2010; in press).
  • Stratified and mixed PV cases; sensitivity of the PV mixing and transport to the form of dissipation
  • Simulation with one layer: how the second layer is put into motion? Vertical stretching? Why this is not an external PV source for this layer?
  • Could the transport seen in the formally-inviscid solution due to spurious dissipation? Does the transport change with a different advective scheme? How can we reduce this spurious dissipation? Increase the resolution? What the literature says about that (not much)? Is it because of the transient –I do not think so because the zonal Lagrangian-mean flow was the same, either at 2000 or 4000 days, in one experiment–?
  • Use a simple nonlinear shallow water model
  • Read Marshall (1997; “Subduction of water masses in an eddying ocean”, JMR, 55, 201–222) and Danabasoglu et al. (1994; “The role of mesoscale tracer transports in the global ocean circulation, Science, 264, 1123-–1126).

Eddies in LADCP

  • See subsurface eddies in LADCP? subsurface submesoscale explained by interaction with other eddies?

Interaction between physics and biology in the North Pacific subtropical gyre

  • Is there a criterion for frontogenesis? Correlate it with FSLE.
  • Does the meridional shift of the Chl transition follows that of EKE and FSLE?
  • Read Lee and Williams (2000), Williams and Follows (2003), Morino-Carbadillo and Neuer (2008) for a discussion on the role of eddies in the nutrient vertical and horizontal transport.
  • Calculation of vertical velocity from Glider: see Rudnick (1996) and write to Frajka-Williams.
  • About error in SSH: LeTraon et al. (1998) and Pascual et al. (2007).
  • Ask Oschlies about the difference in the zonally-averaged contours of constant density and nitrate.
  • Read Oschlies (2002) “Can eddies make ocean deserts bloom?” in Global Biogeochem. Cycles, Oschlies et al. (2000) and Oschlies (2001), as examples of model analysis.
  • See Molemaker et al. (2009) for a discussion on the loss of balance and the forward energy cascade.