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.
Syllabus
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]
Reading:
C.
Wunsch and P. Heimbach, 2007: "Practical Global Oceanic State
Estimation." Physica D. (pdf)
Jan. 30 Workings of MITgcm and SOSE: KPP
parameterization. Veronica Tamsitt
Reading:
MITgcm http://mitgcm.org/ website
documentation, section on KPP: click on section 6.4.2.1 Introduction http://mitgcm.org/public/r2_manual/latest/online_documents/node241.html
and
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.
doi:
http://dx.doi.org/10.1175/1520-0485(1997)027<2418:STSFAB>2.0.CO;2
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.
http://web.mit.edu/raffaele/www/Publications_files/KlocherFerrariLaCasceMerrifield12.pdf
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:
SOSE http://sose.ucsd.edu
MITgcm http://mitgcm.org/
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]
C.
Wunsch and P. Heimbach, 2007: "Practical Global Oceanic State
Estimation." Physica D. (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
The
MITgcm
Validation
of SOSE output: comparison with data sets; issues with independence
Uncertainty
estimates
How
ocean state estimates adjust air-sea fluxes
Parameterizations
in the MITgcm
KPP
mixing
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