Seminar on the Southern Ocean State Estimate
SIO219 Winter quarter, 2014
Thursday’s, 11-noon, Nierenberg Hall 401
Lynne Talley with major assistance from Matt Mazloff
Goal: For participants to learn more about SOSE, its architecture, input data, uncertainties, and applications. In a 1-unit seminar, we cannot approach the depth of understanding of state estimates that a proper 4-unit course would provide, but this seminar should provide useful information and framework for your own more intensive exploration of state estimation and its uses.
Format: student/staff presentation each week, based on an in-depth paper and/or explore major website, and, if applicable, student/staff personal work/experience with SOSE or other state estimates or data assimilations
Credit and grading option: 1 unit, S/U only. Enrolled students are required to participate each week and to lead one week.
Jan. 9 Introduction to SOSE and state estimation – Matt Mazloff
Reading (skim): Mazloff, M., P. Heimbach, and C. Wunsch, An eddy-permitting Southern Ocean state estimate, J. Phys. Oc., 40, 880-899, 2010. [pdf]
Jan. 16 Continuation of introduction to state estimation. Jessica Millar [pdf of talk 10 MB]
Reading: Wunsch, C. and P. Heimbach, Dynamically and kinematically consistent global ocean circulation and ice state estimates. Ocean Circulation and Climate, 2nd Edition, Siedler, G., Griffies, S., Gould, J., Church, J. Eds., Elsevier, 553-579, 2013. [pdf]
Jan. 23 Workings of SOSE: the adjoint. Uriel Zajaczkovski [pdf of talk]
Jan. 30 Workings of MITgcm and SOSE: KPP parameterization. Veronica Tamsitt
Reading: MITgcm http://mitgcm.org/ website documentation, section on KPP: click on section 18.104.22.168 Introduction http://mitgcm.org/public/r2_manual/latest/online_documents/node241.html
Large, William G., Gokhan Danabasoglu, Scott C. Doney, James C. McWilliams, 1997: Sensitivity to Surface Forcing and Boundary Layer Mixing in a Global Ocean Model: Annual-Mean Climatology. J. Phys. Oceanogr., 27, 2418–2447.
Feb 6 Agulhas and tracer releases in SOSE. Jinbo Wang.
Reading: Klocker, A., Ferrari, R., LaCasce, J.H., Merrifield, S. T., 2014. Reconciling float-based and tracer-based estimates of eddy diffusivities. Preprint.
Feb. 13 Effective diffusivity. Ivana Cerovecki.
Reading: Marshall, J., E. Shuckburgh, H. Jones, and C. Hill, 2006: Estimates and implications of surface eddy diffusivity in the Southern Ocean derived from tracer transport. J. Phys. Oceanogr., 36, 1806–1821. doi: http://dx.doi.org/10.1175/JPO2949.1
Feb. 20 Kalman filtering comparison with state estimation. Aneesh Subramanian.
Reading: KALNAY, E., LI, H., MIYOSHI, T., YANG, S.-C. and BALLABRERA-POY, J. (2007), 4-D-Var or ensemble Kalman filter?. Tellus A, 59: 758–773. doi: 10.1111/j.1600-0870.2007.00261.x
Feb. 27 (no seminar – Ocean Sciences Meeting)
March 6 SOSE and sea ice. Angelica Gilroy
Reading: Fenty, I.G. and P. Heimbach, 2013: Coupled Sea Ice-Ocean State Estimation in the Labrador Sea and Baffin Bay. J. Phys. Oceanogr., 43(6), 884-904, doi:10.1175/JPO-D-12-065.1.http://journals.ametsoc.org/doi/abs/10.1175/JPO-D-12-065.1
March 13 (Un)Validation of near real time ECCO in the western North Atlantic with a useful application. Sam Billheimer.
Reading: Billheimer, S. and L. D. Talley, 2013. Near-cessation of Eighteen Degree Water renewal in the western North Atlantic in the warm winter of 2011-2012. J. Geophys. Res. Oceans, 118, doi:10.1002/2013JC009024.
Principal website links:
Background papers and resources:
Large, McWilliams and Doney, Oceanic vertical mixing: a review and a model with a nonlocal boundary layer parameterization. Rev. Geophys., 32, 363-403. 1994.
Mazloff, M., P. Heimbach, and C. Wunsch, An eddy-permitting Southern Ocean state
estimate, J. Phys. Oc., 40, 880-899, 2010. [pdf]
Wunsch, C. and P. Heimbach, Dynamically and kinematically consistent global ocean
circulation and ice state estimates. Ocean Circulation and Climate, 2nd Edition, Siedler, G.,
Griffies, S., Gould, J., Church, J. Eds., Elsevier, 553-579, 2013. [pdf]
Wunsch, C., Discrete Inverse and State Estimation Problems. With Geophysical Fluid Applications, Cambridge Un. Press, Cambridge 371pp., 2006.
Examples of topics that you might choose from, to be decided at and after first meeting on Jan. 8.
Expansion on each major section of Wunsch and Heimbach.
Data assimilation and state estimation:
Other approaches to data assimilation: Kalman filters, Green’s functions
Other data assimilation and state estimation products useful for the Southern Ocean
Validation of SOSE output: comparison with data sets; issues with independence
How ocean state estimates adjust air-sea fluxes
Parameterizations in the MITgcm
Sea ice model
Representation of the bottom boundary layer and stresses in the MITgcm, SOSE and other models
Techniques and results from analyzing SOSE output
Tracer releases and particle tracking
Heat budgets in SOSE
Momentum budgets in SOSE
Buoyancy budgets in SOSE or other state estimates