Editorial Type:
Article
Article Type:
Research Article

Comparison of a Coupled Ocean–Atmosphere Model with and without Oceanic Eddy-Induced Advection. Part I: Ocean Spinup and Control Integrations

Anthony C. Hirst CRC for Southern Hemisphere Meteorology, Division of Atmospheric Research, CSIRO, Aspendale, Victoria, Australia

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Siobhan P. O’Farrell Division of Atmospheric Research, CSIRO, Aspendale, Victoria, Australia

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Hal B. Gordon Division of Atmospheric Research, CSIRO, Aspendale, Victoria, Australia

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Print Publication:
01 Jan 2000
DOI:
https://doi.org/10.1175/1520-0442(2000)013<0139:COACOA>2.0.CO;2
Page(s):
139–163
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Abstract

The Gent and McWilliams (GM) parameterization for large-scale water transport caused by mesoscale oceanic eddies is introduced into the oceanic component of the Commonwealth Scientific and Industrial Research Organisation global coupled ocean–atmosphere model. Parallel simulations with and without the GM scheme are performed to examine the effect of this parameterization on the model behavior for integrations lasting several centuries under conditions of constant atmospheric CO2. The solution of the version with GM shows several significant improvements over that of the earlier version. First, the generally beneficial effects of the GM scheme found previously in studies of stand-alone ocean models, including more realistic deep water properties, increased stratification, reduced high-latitude convection, elimination of fictitious horizontal diffusive heat transport, and more realistic surface fluxes in some regions, are all maintained during the coupled integration. These improvements are especially pronounced in the high-latitude Southern Ocean. Second, the magnitude of flux adjustment is reduced in the GM version, mainly because of smaller surface fluxes at high southern latitudes in the GM ocean spinup. Third, the GM version displays markedly reduced climate drift in comparison to the earlier version. Analysis in the present study verifies previous indications that changes in the pattern of convective heat flux are central to the drift in the earlier version, supporting the view that reduced convective behavior in the GM version contributes to the reduction in drift. Based on the satisfactory behavior of the GM model version, the GM coupled integration is continued for a full 1000 yr. Key aspects of the model behavior during this longer period are also presented. Interannual variability of surface air temperature in the two model versions is briefly examined using some simple measures of magnitude. The variability differs between the two versions regionally, but is little changed on the global scale. In particular, the magnitude of variability in the tropical Pacific is little changed between the versions.

Corresponding author address: Dr. Anthony C. Hirst, CSIRO Atmospheric Research, Private Bag No. 1, Aspendale, Victoria 3195, Australia.

Abstract

The Gent and McWilliams (GM) parameterization for large-scale water transport caused by mesoscale oceanic eddies is introduced into the oceanic component of the Commonwealth Scientific and Industrial Research Organisation global coupled ocean–atmosphere model. Parallel simulations with and without the GM scheme are performed to examine the effect of this parameterization on the model behavior for integrations lasting several centuries under conditions of constant atmospheric CO2. The solution of the version with GM shows several significant improvements over that of the earlier version. First, the generally beneficial effects of the GM scheme found previously in studies of stand-alone ocean models, including more realistic deep water properties, increased stratification, reduced high-latitude convection, elimination of fictitious horizontal diffusive heat transport, and more realistic surface fluxes in some regions, are all maintained during the coupled integration. These improvements are especially pronounced in the high-latitude Southern Ocean. Second, the magnitude of flux adjustment is reduced in the GM version, mainly because of smaller surface fluxes at high southern latitudes in the GM ocean spinup. Third, the GM version displays markedly reduced climate drift in comparison to the earlier version. Analysis in the present study verifies previous indications that changes in the pattern of convective heat flux are central to the drift in the earlier version, supporting the view that reduced convective behavior in the GM version contributes to the reduction in drift. Based on the satisfactory behavior of the GM model version, the GM coupled integration is continued for a full 1000 yr. Key aspects of the model behavior during this longer period are also presented. Interannual variability of surface air temperature in the two model versions is briefly examined using some simple measures of magnitude. The variability differs between the two versions regionally, but is little changed on the global scale. In particular, the magnitude of variability in the tropical Pacific is little changed between the versions.

Corresponding author address: Dr. Anthony C. Hirst, CSIRO Atmospheric Research, Private Bag No. 1, Aspendale, Victoria 3195, Australia.

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  • Akitomo, K., T. Awaji, and N. Imasato, 1995: Open ocean deep convection in the Weddell Sea: Two-dimensional numerical experiments with a nonhydrostatic model. Deep-Sea Res.,42, 53–73.

  • Böning, C. W., W. R. Holland, F. O. Bryan, G. Danabasoglu, and J. C. McWilliams, 1995: An overlooked problem in model simulations of the thermohaline circulation and heat transport in the Atlantic Ocean. J. Climate,8, 515–523.

  • Boville, B. A., and P. R. Gent, 1998: The NCAR climate system model, version one. J. Climate,11, 1115–1130.

  • Bryan, F., 1998: Climate drift in a multicentury integration of the NCAR climate system model. J. Climate,11, 1455–1471.

  • Cai, W., and P. C. Chu, 1996: Ocean climate drift and interdecadal oscillation due to a change in thermal damping. J. Climate,11, 2821–2833.

  • ——, and H. B. Gordon, 1999: Southern high-latitude ocean climate drift in a coupled model. J. Climate,12, 132–146.

  • Cox, M. D., 1984: A primitive equation, 3-dimensional model of the ocean. GFDL Ocean Group Tech. Rep. 1, GFDL/Princeton University, Princeton, N.J., 141 pp. [Available from Geophysics Fluid Dynamics Laboratory/NOAA, Princeton University, Princeton, NJ 08542.].

  • ——, 1987: Isopycnal diffusion in a z-coordinate ocean model. Ocean Modeling (unpublished manuscripts), 74, 1–15.

  • Cubasch, U. K., K. Hasselmann, H. Hock, E. Maier-Reimer, U. Mikolajewicz, A. Stossel, and R. Voss, 1992: Time-dependent greenhouse warming computations with a coupled ocean–atmosphere model. Climate Dyn.,8, 55–69.

  • Cummins, P. F., G. Holloway, and A. E. Gargett, 1990: Sensitivity of the GFDL ocean model to a parameterization of vertical diffusion. J. Phys. Oceanogr.,20, 817–830.

  • Da Silva, A. M., C. C. Young, and S. Levitus, 1994: Algorithms and Procedures. Atlas of Surface Marine Data, 1994, Vol. 1, U.S. Department of Commerce, NOAA Atlas NESDIS 6, 83 pp.

  • Danabasoglu, G., and J. C. McWilliams, 1995: Sensitivity of the global ocean circulation to parameterizations of mesoscale tracer transports. J. Climate,8, 2967–2987.

  • ——, ——, and P. R. Gent, 1994: The role of mesoscale tracer transports in the global ocean circulation. Science,264, 1123–1126.

  • Duffy, P. B., D. Eliason, A. J. Bourgeois, and C. Covey, 1995: Simulation of bomb radiocarbon in two ocean general circulation models. J. Geophys. Res.,100, 22 545–22 565.

  • ——, K. Caldeira, J. Selevaggi, and M. I. Hoffert, 1997: Effects of subgrid-scale mixing parameterizations on simulated distributions of natural 14C, temperature, and salinity in a three-dimensional ocean general circulation model. J. Phys. Oceanogr.,27, 498–523.

  • England, M. H., 1993: On the formation of global-scale water masses in ocean general circulation models. J. Phys. Oceanogr.,23, 1523–1552.

  • ——, 1995: Using chlorofluorocarbons to assess ocean climate models. Geophys. Res. Lett.,22, 3051–3054.

  • ——, and A. C. Hirst, 1997: Chloroflurocarbon uptake in a World Ocean model, 2: Sensitivity to surface thermohaline forcing and subsurface mixing parameterization. J. Geophys. Res.,102, 15 709–15 731.

  • Fanning, A. F., and A. J. Weaver, 1997: On the role of flux adjustments in an idealized coupled climate model. Climate Dyn.,13, 691–701.

  • Flato, G. M., and W. D. Hibler, 1990: On a simple sea-ice dynamics model for climate studies. Ann. Glaciol.,14, 72–77.

  • Gargett, A. E., 1984: Vertical eddy diffusivity in the ocean interior. J. Mar. Res.,42, 359–393.

  • Gent, P. R., and J. C. McWilliams, 1990: Isopycnal mixing in ocean circulation models. J. Phys. Oceanogr.,20, 150–155.

  • ——, J. Willebrand, T. J. McDougall, and J. C. McWilliams, 1995: Parameterizing eddy-induced tracer transports in ocean circulation models. J. Phys. Oceanogr.,25, 463–474.

  • Gordon, H. B., and S. P. O’Farrell, 1997: Transient climate change in the CSIRO coupled model with dynamical sea ice. Mon. Wea. Rev.,125, 875–907.

  • Gough, W. A., 1997: Isopycnal mixing and convective adjustment in an ocean circulation model. Atmos.–Ocean,35, 495–509.

  • Griffies, S. M., A. Gnanadesikan, R. C. Pacanowski, V. Larichev, J. K. Dukowicz, and R D. Smith, 1998: Isoneutral diffusion in a z-coordinate ocean model. J. Phys. Oceanogr.,28, 805–831.

  • Hirst, A. C., and W. Cai, 1994: Sensitivity of a World Ocean GCM to changes in subsurface mixing parameterization. J. Phys. Oceanogr.,24, 1256–1279.

  • ——, and T. J. McDougall, 1996: Deep-water properties and surface buoyancy flux as simulated by a z-coordinate model including eddy-induced advection. J. Phys. Oceanogr.,26, 1320–1343.

  • ——, and ——, 1998: Meridional overturning and dianeutral transport in a z-coordinate model including eddy-induced advection. J. Phys. Oceanogr.,28, 1205–1223.

  • ——, H. B. Gordon, and S. P. O’Farrell, 1996: Global warming in a coupled climate model including oceanic eddy-induced advection. Geophys. Res. Lett.,23, 3361–3364.

  • IPCC, 1996: Climate Change 1995: The Science of Climate Change. J. T. Houghton et al., Eds., Cambridge University Press, 572 pp.

  • Jacobs, S. S., R. G. Fairbanks, and Y. Horibe, 1985: Origin and evolution of water masses near the Antarctic continental margin:Evidence from H18 2O/H16 2O ratios in seawater. Oceanology of the Antarctic Continental Shelf, S. S. Jacobs, Ed., Antarctic Research Series, Vol. 43, American Geophysical Union, 59–85.

  • Johns, T. C., R. E. Carnell, J. F. Crossley, J. M. Gregory, J. F. B. Mitchell, C. A. Senior, S. B. F. Tett, and R. A. Wood, 1997: The second Hadley Centre coupled ocean–atmosphere GCM: Model description, spin-up and validation. Climate Dyn.,13, 103–134.

  • Kowalczyk, E. A., J. R. Garratt, and P. B. Krummel, 1994: Implementation of a soil canopy scheme into the CSIRO GCM—Regional aspects of the model response. CSIRO Division of Atmospheric Research, Tech. Paper 32, 59 pp. [Available from CSIRO Atmospheric Research, PMB1, Asperdale, Vic. 3195, Australia.].

  • Large, W. G., G. Danabasoglu, S. C. Doney, and J. 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.

  • Levitus, S., 1982: Climatological Atlas of the World Ocean. NOAA Prof. Paper 13., U.S. Government Printing Office, 173 pp. [Available from U.S. Government Printing Office, Washington, DC 20402.].

  • Manabe, S., and R. J. Stouffer, 1996: Low-frequency variability of surface air temperature in a 1000-year integration of a coupled atmosphere–ocean–land surface model. J. Climate,9, 376–393.

  • ——, K. Bryan, and M. J. Spelman, 1990: Transient response of a global coupled ocean–atmosphere model to a doubling of atmospheric carbon dioxide. J. Phys. Oceanogr.,20, 722–749.

  • ——, R. J. Stouffer, M. J. Spelman, and K. Bryan, 1991: Transient response of a coupled ocean–atmosphere model to gradual changes of atmospheric CO2. Part I: Annual mean response. J. Climate,4, 785–818.

  • McDougall, T. J., and P. C. McIntosh, 1996: The temporal-residual-mean velocity. Part I: Derivation and scalar conservation equations. J. Phys. Oceanogr.,26, 2653–2665.

  • ——, A. C. Hirst, M. H. England, and P. C. McIntosh, 1996: Implications of a new eddy parameterization for ocean models. Geophys. Res. Let.,23, 2085–2088.

  • Mitchell, J. M., 1966: Climate change. WMO Tech. Note 79, 79 pp.

  • Muench, R. D., H. J. S. Fernando, and G. R. Stegen, 1990: Temperature and Salinity staircases in the northwestern Weddell Sea. J. Phys. Oceanogr.,20, 295–306.

  • Murphy, J. M., and J. F. B. Mitchell, 1995: Transient response of the Hadley Centre coupled ocean–atmosphere model to increasing carbon dioxide. Part II: Spatial and temporal structure of response. J. Climate,8, 57–80.

  • O’Farrell, S. P., 1998: Sensitivity study of a dynamical sea ice model:The effect of the external stresses and land boundary conditions on ice thickness distributuion. J. Geophys. Res.,103, 15 751–15 782.

  • Power, S. B., 1995: Climate drift in a global ocean general circulation model. J. Phys. Oceanogr.,25, 1025–1036.

  • ——, R. Kleeman, R. A. Colman, and B. J. McAvaney, 1995a: Modeling the surface heat flux response to long-lived SST anomalies in the North Atlantic. J. Climate,8, 2161–2180.

  • ——, F. Tseitkin, M. Dix, R. Kleeman, R. Colman, and D. Holland, 1995b: Stochastic variability at the air-sea interface on decadal time scales. Geophys. Res. Lett.,22, 2593–2596.

  • Rahmstorf, S., 1995: Climate drift in an ocean model coupled to a simple, perfectly matched atmosphere. Climate Dyn.,11, 447–458.

  • Redi, M. H., 1982: Oceanic isopycnal mixing by coordinate rotation. J. Phys. Oceanogr.,12, 1154–1158.

  • Rix, N. L., and J. Willebrand, 1996: Parameterization of mesoscale eddies as inferred from a high-resolution circulation model. J. Phys. Oceanogr.,26, 2281–2285.

  • Robitaille, D. Y., and A. J. Weaver, 1995: Validation of sub-grid scale mixing schemes using CFCs in a global ocean model. Geophys. Res. Lett.,22, 2917–2920.

  • Santer, B. D., K. E. Taylor, T. L. Wigley, J. E. Penner, P. D. Jones, and U. Cubasch, 1995: Towards detection and atttribution of an anthopogenic effect on climate. Climate Dyn.,12, 77–100.

  • Semtner, A. J., 1976: A model of the thermodynamic growth of sea ice in numerical investigations of climate. J. Phys. Oceanogr.,6, 379–389.

  • Tett, S. F. B., T. C. Johns, and J. F. B. Mitchell, 1997: Global and regional variability in a coupled AOGCM. Climate Dyn.,13, 303–323.

  • Toggweiler, J. R., and B. Samuels, 1995: Effect of sea ice on the salinity of Antarctic Bottom Waters. J. Phys. Oceanogr.,25, 1980–1997.

  • Veronis, G., 1975: The role of models in tracer studies. Numerical Models of the Ocean Circulation, R. O. Reid, Ed., National Academy of Sciences, 133–146.

  • von Storch, J.-S., V. V. Kharin, U. Cubasch, G. C. Hegerl, D. Schriever, H. von Storch, and E Zorita, 1997: A description of a 1260-year control integration with the coupled ECHAM1/LSG general circulation model. J. Climate,10, 1525–1543.

  • Washington, W. M., and G. A. Meehl, 1989: Climate sensitivity due to increased CO2: Experiments with a coupled atmosphere and ocean general circulation model. Climate Dyn.,4, 1–38.

  • Weaver, A. J., and M. Eby, 1997: On the numerical implementation of mixing parameterizations in the GFDL ocean model. J. Phys. Oceanogr.,27, 369–377.

  • Whetton, P. H., M. H. England, S. P. O’Farrell, I. G. Watterson, and A. B. Pittock, 1997: Global comparison of the regional rainfall results of enhanced greenhouse coupled and mixed layer ocean experiments: Implications for climate change scenario development. Climatic Change,33, 497–519.

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