Tamay M. Özgökmen

Associate Professor of Physical Oceanography

Education

I graduated from Istanbul Lisesi in 1983, obtained my B.S. degree in Mechanical Engineering from Bosphorus University in Istanbul/Turkey in 1988, an M.S. degree in Mechanical Engineering from the University of Miami in 1990, and a Ph.D. in Engineering Sciences from Dartmouth College in 1995.

Research Interests

My research interest centers around the investigation of multi-scale oceanic flows using non-hydrostatic numerical models and Lagrangian methods.

Publications

Book:

Griffa, A., A.D. Kirwan, A.J. Mariano, T.M. Özgökmen and T. Rossby, 2007: Lagrangian Analysis and Prediction of Coastal and Ocean Dynamics. Cambridge University Press, 487 pp, ISBN-13: 9780521870184 (order from amazon.com).

Journal Articles:

1) Özgökmen, T.M., E.P. Chassignet and A.M. Paiva, 1997: Impact of wind forcing, bottom topography, and inertia on midlatitude jet separation in a quasigeostrophic model. J. Phys. Oceanogr., 27, 2460-2476.

2) Özgökmen, T.M. and E.P. Chassignet, 1998: The emergence of inertial gyres in a two-layer quasigeostrophic model. J. Phys. Oceanogr., 28, 461-484.

3) Özgökmen, T.M. and O.E. Esenkov, 1998: Asymmetric fingers induced by a nonlinear equation of state. Phys. Fluids, 10, 1882-1890.

4) Özgökmen, T.M., O.E. Esenkov and D.B. Olson 1998: A numerical study of layer formation due to fingers in double-diffusive convection in a vertically-bounded domain. J. Mar. Res., 56/2, 463-487.

5) Özgökmen, T.M., A. Griffa, L. I. Piterbarg, and A. J. Mariano, 2000: On the predictability of the Lagrangian trajectories in the ocean. J. Atmos. Ocean. Tech., 17/3, 366-383.

6) Crisciani, F. and T.M. Özgökmen, 2001: Symmetry properties of barotropic bottom-dissipated single-gyre systems in the inertial regime. Dyn. Atmos. Oceans, 33/2, 135-156.

7) Özgökmen, T.M., E.P. Chassignet and C. G. H. Rooth, 2001: On the connection between the Mediterranean outflow and the Azores Current. J. Phys. Oceanogr., 31/2, 461-480.

8) Castellari, S., A. Griffa, T.M. Özgökmen and P.-M. Poulain, 2001: Prediction of particle trajectories in the Adriatic Sea using Lagrangian data assimilation. J. Mar. Sys., 29, 33-50.

9) Özgökmen, T.M., L.I. Piterbarg, A.J. Mariano, and E.H. Ryan, 2001: Predictability of drifter trajectories in the tropical Pacific Ocean. J. Phys. Oceanogr., 31/9, 2691-2720.

10) Özgökmen, T.M., and F. Crisciani, 2001: On the dynamics of beta-plumes. J. Phys. Oceanogr., 31/12, 3569-3580.

11) Özgökmen, T.M., and E.P. Chassignet, 2002: Dynamics of two-dimensional turbulent bottom gravity currents. J. Phys. Oceanogr., 32/5, 1460-1478.

12) Mariano, A.J., A. Griffa, T.M. Özgökmen, and E. Zambianchi, 2002: Lagrangian Analysis and Predictability of Coastal and Ocean Dynamics 2000. J. Atmos. Ocean. Tech., 19/7, 1114-1126.

13) Piterbarg, L.I., and T.M. Özgökmen, 2002: A simple prediction algorithm for the Lagrangian motion in 2D turbulent flows. SIAM J. Appl. Math., 63/1, 116-148.

14) Molcard, A., L. Gervasio, A. Griffa, G.P. Gasparini, L. Mortier, and T.M. Özgökmen, 2002: Numerical investigation of the Sicily Channel dynamics: density currents and water mass advection. J. Mar. Sys., 36 (3-4), 219-238.

15) Molcard A., L. Piterbarg, A. Griffa, T.M. Özgökmen, and A.J. Mariano, 2003: Assimilation of drifter positions for the reconstruction of the Eulerian circulation field. J. Geophys. Res. Oceans, 108/3, 3056, doi:10.1029/2001JC001240.

16) Mariano, A.J., T.M. Chin, and T.M. Özgökmen, 2003: Stochastic boundary conditions for coastal flow modeling. Geophys. Res. Letters, 30/9, doi:10.1029/2003GL016972.

17) Özgökmen, T.M., W. Johns, H. Peters, and S. Matt, 2003: Turbulent mixing in the Red Sea outflow plume from a high-resolution nonhydrostatic model. J. Phys. Oceanogr., 33/8, 1846-1869.

18) Özgökmen, T.M., A. Molcard, T.M. Chin, L.I. Piterbarg, and A. Griffa, 2003: Assimilation of drifter observations in primitive equation models of midlatitude ocean circulation. J. Geophys. Res. Oceans, 108(C7), 3238, doi:10.1029/2002JC001719.

19) Chin, T.M., T.M. Özgökmen, and A.J. Mariano, 2004: Multi-variate spline and scale-specific solution for variational analyses. J. Ocean. Atmos. Tech., 21/2, 379-386..

20) Griffa, A., L.I. Piterbarg, and T.M. Özgökmen, 2004: Predictability of Lagrangian trajectories: effects of uncertainty in the underlying Eulerian flow. J. Mar. Res., 62/1, 1-35.

21) Paldor, N., Y. Dvorkin, A.J., Mariano, A.J., T.M. Özgökmen, and E. Ryan, 2004: A practical, hybrid model for predicting the trajectories of near-surface drifters ocean drifters. J. Atmos. Ocean. Tech., 21/8, 1246-1258 .

22) Özgökmen, T.M., P.F. Fischer, J. Duan and T. Iliescu, 2004: Entrainment in bottom gravity currents over complex topography from three-dimensional nonhydrostatic simulations. Geophys. Res. Letters, 31, L13212, doi:10.1029/2004GL020186.

23) Özgökmen, T.M., P.F. Fischer, J. Duan and T. Iliescu, 2004: Three-dimensional turbulent bottom density currents from a high-order nonhydrostatic spectral element model. J. Phys. Oceanogr., 34/9, 2006-2026.

24) Molcard, A., Griffa, A., and T.M. Özgökmen, 2005: Lagrangian data assimilation in multi-layer primitive equation ocean models. J. Ocean. Atmos. Tech., 22/1, 70-83.

25) Chang, Y.S., X. Xu, T.M. Özgökmen, E.P. Chassignet, H. Peters and P.F. Fischer, 2005: Comparison of gravity current mixing parameterizations and calibration using a high-resolution 3D nonhydrostatic spectral element model. Ocean Modelling, 10, 342-368.

26) Özgökmen, T.M., P.F. Fischer, and W.E. Johns, 2006: Product water mass formation by turbulent density currents from a high-order nonhydrostatic spectral element model. Ocean Modelling, 12, 237-267.

27) Molcard, A., A.C. Poje, and T.M. Özgökmen, 2006: Directed drifter launch strategies for Lagrangian data assimilation using hyperbolic trajectories. Ocean Modelling, 12, 268-289.

28) Xu, X., Chang, Y.S., H. Peters, T.M. Özgökmen, and E.P. Chassignet, 2006: Parameterization of gravity current entrainment for ocean circulation models using a high-order 3D nonhydrostatic spectral element model. Ocean Modelling, 14, 19-44.

29) Caglar, M., T.M. Özgökmen, and L.I. Piterbarg, 2006: Parameterization of submeso-scale eddy-rich flows using a stochastic velocity model. J. Ocean. Atmos. Tech., 23/12, 1745-1758.

30) Du, A., J. Duan, H. Gao, T.M. Özgökmen, 2006: Ergodic dynamics of the coupled quasigeostrophic flow-energy balance system. Fundamental and Applied Mathematics. 12/6, 67-84.

31) Özgökmen, T.M., T. Iliescu, P.F. Fischer, A. Srinivasan and J. Duan, 2007: Large eddy simulation of stratified mixing in two-dimensional dam-break problem in a rectangular enclosed domain. Ocean Modelling, 16, 106-140.

32) Bongolan-Walsh, V.P., J. Duan, P.F. Fischer, T.M. Özgökmen and T. Iliescu, 2007: Impact of boundary conditions on entrainment and transport in gravity currents. Applied Mathematical Modelling, 31. 1338-1350.

33) Haza, A., L.I. Piterbarg, P. Martin, T.M. Özgökmen, and A. Griffa, 2007: A Lagrangian subgrid-scale model and application for transport improvement in the Adriatic Sea using NCOM. Ocean Modelling, 17, 68-91.

34) Chin, T.M., T.M. Özgökmen, and A.J. Mariano, 2007: Empirical and stochastic formulations of western boundary conditions. Ocean Modelling, 17, 219-238.

35) Haza, A., A. Griffa, P. Martin, A. Molcard, T.M. Özgökmen, A.C. Poje, R. Barbanti, J. Book, P.M. Poulain, M. Rixen, and P. Zanasca, 2007: Model-based directed drifter launches in the Adriatic Sea: Results from the DART experiment. Geophys. Res. Letters, 34, L10605, doi:10.1029/2007GL029634.

36) Xu, X., E. P. Chassignet, J. F. Price, T.M. Özgökmen and H. Peters, 2007: A regional modeling study of the entraining Mediterranean outflow. J. Geophys. Res. Oceans, 112, C12005, doi:10.1029/2007JC004145.

37) Ilicak, M., T.M. Özgökmen, H. Peters, H.Z. Baumert and M. Iskandarani, 2008: Very large eddy simulation of the Red Sea overflow. Ocean Modelling, 20, 183-2006.

38) Özgökmen, T.M. and P.F. Fischer, 2008: On the role of bottom roughness in overflows. Ocean Modelling, 20, 336-361.

39) Chang, Y.S., T.M. Özgökmen, H. Peters, and X. Xu, 2008: Numerical simulation of the Red Sea outflow using HYCOM and comparison with REDSOX observations. J. Phys. Oceanogr., 38/2, 337-358.

40) Bongolan-Walsh, V.P., J. Duan, and T.M. Özgökmen, 2008: Dynamics of transport under random fluxes on the boundary. Communications in Nonlinear Science and Numerical Simulation, 13, 1627-1641.

41) Haza, A., A.C. Poje, T.M. Özgökmen, and P. Martin, 2008: Relative dispersion from a high-resolution coastal model of the Adriatic Sea. Ocean Modelling, 22, 48-65.

42) Ilicak, M., T.M. Özgökmen, H. Peters, H.Z. Baumert and M. Iskandarani, 2008: Performance of two-equation turbulence closures in three-dimensional simulations of the Red Sea overflow. Ocean Modelling, 24, 122-139.

43) Magaldi, M., T.M. Özgökmen, A. Griffa, E. Chassignet, M. Iskandarani and H. Peters, 2008: Turbulent flow regimes behind a coastal cape in a stratifed and rotating environment. Ocean Modelling, 25, 65-82.

44) Özgökmen, T.M., T. Iliescu, and P.F. Fischer, 2009: Large eddy simulation of stratified mixing in a three-dimensional lock-exchange system. Ocean Modelling, 26, 134-155.

45) Chang, Y.S, Z.D. Garraffo, H. Peters and Özgökmen, T.M., 2009: Pathways of nordic overflows from climate model scale and eddy resolving simulations. Ocean Modelling, 29, 66-84.

46) Ilicak, M., T.M. Özgökmen, E. Özsoy and P.F. Fischer, 2009: Non-hydrostatic modeling of exchange flows across complex geometries. Ocean Modelling, 29, 159-175.

47) Legg, S., Y. Chang, E. Chassignet, G. Danabasoglu, T. Ezer, A. Gordon, S. Griffies, R. Hallberg, L. Jackson, W. Large, T. Özgökmen, H. Peters, J. Price, U. Riemenschneider, W. Wu, X. Xu and J. Yang, 2009: Improving oceanic overflow representation in climate models: the Gravity Current Entrainment Climate Process Team. Bulletin of the American Meteorological Society, 90/5, 657-670.

48) Özgökmen, T.M., T. Iliescu, and P.F. Fischer, 2009: Reynolds number dependence of mixing in a lock-exchange system from direct numerical and large eddy simulations. Ocean Modelling, 30, 190-206.

49) Muench, R.D., A.K. Wahlin, T.M. Özgökmen, R. Hallberg, and L. Padman, 2009: Impacts of bottom corrugations on a dense outflow: the NW Ross Sea. Geophys. Res. Letters, vol. 36, doi:10.1029/2009GL041347.

50) Poje, A.C., A.C. Haza, T.M. Özgökmen, M. Magaldi and Z.D. Garraffo, 2010: Resolution dependent relative dispersion statistics in a hierarchy of ocean models. Ocean Modelling, 31, 36-50.

51) Duan, J., P.F. Fischer, T. Iliescu and T. M. Özgökmen: Bridging the Boussinesq and primitive equations through spatio-temporal filtering. Applied Math. Letters, submitted: June 2, 2009; accepted: June 24, 2009.

52) Magaldi, M.M., T.M. Özgökmen, A. Griffa and M. Rixen: On the response of a turbulent coastal buoyant current to wind events: the case of the Western Adriatic Current. Ocean Dynamics, in press (submitted: 6 August 2009, revised: 26 October 2009, accepted: 3 November, 2009).

53) Haza, A.C., T.M. Özgökmen, A. Griffa, A. Molcard, P.M. Poulain, and G. Peggion: Transport properties in small scale coastal flows: relative dispersion from VHF radar measurements in the Gulf of La Spezia. Ocean Dynamics, (submitted: 8 November 2009).

54) Ilicak, M., T.M. Özgökmen and W. Johns: How does the Red Sea outflow interact with Gulf of Aden eddies? Submitted to Continental Shelf Research (16 June 2009).

55) Kirwan et al.: Enhanced Lagrangian prediction from ocean general circulation models with application to sonobuoys. In prep. for Ocean Modelling, 18 Nov 2009.

56) Iskandarani, M, W. Zhang and T.M. Özgökmen: Comparison of continous and discontinous Galerkin methods in spectral element simulations of stratified turbulent flows, in the works (Feb 2009).

56) Ilicak, M., and T.M. Özgökmen: Comparison of the Meditteranean Sea and Red Sea overflows from high-resolution numerical studies. Kick off (23 June 2009).

Book Chapters:

1) Cushman-Roisin, B., and T.M. Özgökmen, 1994: A new look at the role of eddies in the general circulation. In "Modelling of Oceanic Vortices", ed: G.J.F. van Heijst, pp. 123-124.

2) Bongolan-Walsh, V.P., J. Duan, H. Go, A., T.M. Özgökmen, P.F. Fischer, and T. Iliescu, 2005: Enstrophy and ergodicity of gravity currents. IMA Volumes in Mathematics and its Applications, Vol. 140 - Probability and Partial Differential Equations in Modern Applied Mathematics, eds: J. Duan and E.C. Waymire, Springer-Verlag, New York, pp. 61-78.

3) Piterbarg, L.I., T.M. Özgökmen, A. Griffa, and A.J. Mariano, 2007: Predictability of Lagrangian motion in the upper ocean. Lagrangian Analysis and Prediction of Coastal and Ocean Dynamics, eds: A. Griffa, A.D. Kirwan, A.J. Mariano, T.M. Özgökmen and T. Rossby, Cambridge University Press, pp. 136-171.

4) Molcard, A., T.M. Özgökmen, A. Griffa, L.I. Piterbarg, and T.M. Chin, 2007: Lagrangian data assimilation in ocean general circulation models. Lagrangian Analysis and Prediction of Coastal and Ocean Dynamics, eds: A. Griffa, A.D. Kirwan, A.J. Mariano, T.M. Özgökmen and T. Rossby, Cambridge University Press, pp. 172-203.

Synergistic Activities

* Lagrangian Analysis and Predictability of Coastal and Oceanic Dynamics - Group

* Climate Process Team on Gravity Current Entrainment

* Chair of MPO Academic Committee: MPO graduate study guide and FAQ for RSMAS Applications

* RSMAS senator to University of Miami Faculty Senate

Events

* May 14, 2009: Graduation of PhD students Mehmet Ilicak and Marcello Magaldi:

Favorite Statements of Scientific Wisdom

"Predicton is very difficult, especially for the future" by Niels Bohr.

"Never accept anything as true unless it clearly is. Divide every difficult problem into small parts, and solve the problem by attacking these parts. Always proceed from simple to complex, looking for patterns and order. Be as complete and thorough as possible, so that nothing is missed" by Descardes.

Contact

Tamay M. Özgökmen
RSMAS/MPO
4600 Rickenbacker Causeway
Miami, Florida 33149-1098, USA

Tel : 305 421 4053
Fax : 305 421 4696
tozgokmen@rsmas.miami.edu

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