AOS Faculty Profile
Lecturer, Ph.D. University of Washington
Address: 351 GFDL
Phone: (609) 452-6508
Email: Robert.Hallberg at noaa.gov
Ocean Dynamics and Numerical Ocean Model Development
The ocean is sufficiently complicated that a comprehensive understanding the ocean’s role in climate requires the use of numerical models that accurately represent the ocean’s dynamics on timescales from tidal to millennial. My research is focused on developing such models and using them to understand key aspects of the ocean’s dynamics.
The ocean is known observationally to exhibit very weak mixing across interior density surfaces. Much of my research effort is focused on developing a density-coordinate ocean model that robustly respects this property. While this approach constrains cross-density-surface mixing by construction, it introduces unique challenges in representing the non-conservative aspects of the ocean’s thermodynamics. Recent foci for me have included the accurate treatment of the ocean’s nonlinear equation of state and the representation of vigorously entraining overflow gravity currents in ocean models.
In addition, I have recently been studying the role of eddies in the Southern ocean’s dynamics and especially in the stability of the southern upwelling branch, using increasingly realistic high resolution numerical studies. These studies demonstrate the importance of the mesoscale ocean dynamics for constraining the global ocean circulation.
Some Recent Publications:
Griffies, Stephen M., G Danabasoglu, P J Durack, Alistair Adcroft, V Balaji, C Boning, E P Chassignet, E N Curchitser, J Deshayes, H Drange, B Fox-Kemper, P J Gleckler, J M Gregory, H Haak, Robert Hallberg, H T Hewitt, D M Holland, T Ilyina, J H Jungclaus, Y Komuro, John P Krasting, W G Large, S J Marsland, S Masina, T J McDougall, A J George Nurser, James C Orr, A Pirani, F Qiao, Ronald J Stouffer, K E Taylor, A M Treguier, H Tsujino, P Uotila, M Valdivieso, Michael Winton, and S G Yeager, in press: Experimental and diagnostic protocol for the physical component of the CMIP6 Ocean Model Intercomparison Project (OMIP). Geoscientific Model Development Discussion. doi:10.5194/gmd-2016-77. April 2016.
Krasting, John P., John P Dunne, Ronald J Stouffer, and Robert Hallberg, March 2016: Enhanced Atlantic sea-level rise relative to the Pacific under high carbon emission rates. Nature Geoscience, 9(3), doi:10.1038/ngeo2641.
Melet, Angelique, Sonya Legg, and Robert Hallberg, May 2016: Climatic impacts of parameterized local and remote tidal mixing. Journal of Climate, 29(10), doi:10.1175/JCLI-D-15-0153.1.
Farneti, Riccardo, S M Downes, Stephen M Griffies, S J Marsland, E Behrens, M Bentsen, D Bi, A Biastoch, C Boning, A Bozec, V M Canuto, E P Chassignet, G Danabasoglu, S Danilov, N Diansky, H Drange, P G Fogli, A Gusev, Robert Hallberg, A Howard, M Ilicak, T Jung, M Kelley, W G Large, A Leboissetier, M Long, J Lu, S Masina, A Mishra, A Navarra, A J George Nurser, L Patara, and Bonita L Samuels, et al., September 2015: An assessment of Antarctic Circumpolar Current and Southern Ocean Meridional Overturning Circulation during 1958–2007 in a suite of interannual CORE-II simulations. Ocean Modelling, 93, doi:10.1016/j.ocemod.2015.07.009.
Jansen, Malte, Alistair Adcroft, Robert Hallberg, and Isaac M Held, August 2015: Parameterization of eddy fluxes based on a mesoscale energy budget. Ocean Modelling, 92, doi:10.1016/j.ocemod.2015.05.007.
Jansen, Malte, Alistair Adcroft, Robert Hallberg, and Isaac M Held, October 2015: Energy budget-based backscatter in an eddy permitting primitive equation model. Ocean Modelling, 94, doi:10.1016/j.ocemod.2015.07.015.
Melet, Angelique, Robert Hallberg, Alistair Adcroft, M Nikurashin, and Sonya Legg, March 2015: Energy flux into internal lee waves: sensitivity to future climate changes using linear theory and a climate model. Journal of Climate, 28(6), doi:10.1175/JCLI-D-14-00432.1.
Wang, He, Sonya Legg, and Robert Hallberg, February 2015: Representations of the Nordic Seas overflows and their large scale climate impact in coupled models. Ocean Modelling, 86, doi:10.1016/j.ocemod.2014.12.005.
Zanowski, Hannah, Robert Hallberg, and Jorge L Sarmiento, November 2015: Abyssal Ocean Warming and Salinification after Weddell Polynyas in the GFDL CM2G Coupled Climate Model. Journal of Physical Oceanography, 45(11), doi:10.1175/JPO-D-15-0109.1.