Ocean Dynamics

, Volume 59, Issue 1, pp 139–155 | Cite as

Impact of GODAE products on nested HYCOM simulations of the West Florida Shelf

  • George R. HalliwellJr
  • Alexander Barth
  • Robert H. Weisberg
  • Patrick Hogan
  • Ole Martin Smedstad
  • James Cummings
Article

Abstract

Nested non-assimilative simulations of the West Florida Shelf for 2004–2005 are used to quantify the impact of initial and boundary conditions provided by Global Ocean Data Assimilation Experiment ocean products. Simulations are nested within an optimum interpolation hindcast of the Atlantic Ocean, the initial test of the US Navy Coupled Ocean Data Assimilation system for the Gulf of Mexico, and a global ocean hindcast that used the latter assimilation system. These simulations are compared to one that is nested in a non-assimilative Gulf of Mexico model to document the importance of assimilation in the outer model. Simulations are evaluated by comparing model results to moored Acoustic Doppler Current Profiler measurements and moored sea surface temperature time series. The choice of outer model has little influence on simulated velocity fluctuations over the inner and middle shelf where fluctuations are dominated by the deterministic wind-driven response. Improvement is documented in the representation of alongshore flow variability over the outer shelf, driven in part by the intrusion of the Loop Current and associated cyclones at the shelf edge near the Dry Tortugas. This improvement was realized in the simulation nested in the global ocean hindcast, the only outer model choice that contained a realistic representation of Loop Current transport associated with basin-scale wind-driven gyre circulation and the Atlantic Meridional Overturning Circulation. For temperature, the non-assimilative outer model had a cold bias in the upper ocean that was substantially corrected in the data-assimilative outer models, leading to improved temperature representation in the simulations nested in the assimilative outer models.

Keywords

Numerical modeling Coastal circulation 

References

  1. Adcroft A, Hallberg R (2005) On methods for solving the oceanic equations of motion in generalized vertical coordinates. Ocean Model 11:224–233CrossRefGoogle Scholar
  2. Adcroft A, Hill C, Marshall J (1997) Representation of topography by shaved cells in a height coordinate ocean model. Mon Weather Rev 125:2293–2315CrossRefGoogle Scholar
  3. Barth A, Alvera-Azcárate A, Weisberg RH (2008) Benefit of nesting a regional model into a large-scale ocean model instead of climatology. Application to the West Florida Shelf. Cont Shelf Res 28:561–573, doi:10.1016/j.csr.2007.11.004 Google Scholar
  4. Beckmann A, Haidvogel DB (1993) Numerical simulation of flow around a tall isolated seamount, 1, problem formulation and model accuracy. J Phys Oceanogr 23:1736–1753CrossRefGoogle Scholar
  5. Bleck R (1998) Ocean modeling in isopycnic coordinates. In: Chassignet EP, Verron J (eds) Ocean modeling and parameterization, Chapter 18. NATO Sci Ser Gen Sub-ser C Math Phys Ser 516:423–448Google Scholar
  6. Bleck R (2002) An oceanic general circulation framed in hybrid isopycnic-Cartesian coordinates. Ocean Model 4:55–88CrossRefGoogle Scholar
  7. Bleck R, Rooth C, Hu D, Smith LT (1992) Ventilation patterns and mode water formation in a wind- and thermodynamically driven isopycnic coordinate model of the North Atlantic. J Phys Oceanogr 22:1486–1505CrossRefGoogle Scholar
  8. Browning GL, Kreiss H-O (1982) Initialization of the shallow water equations with open boundaries by the bounded derivative method. Tellus 34:334–351CrossRefGoogle Scholar
  9. Browning GL, Kreiss H-O (1986) Scaling and computation of smooth atmospheric motions. Tellus 38A:295–313CrossRefGoogle Scholar
  10. Canuto VM, Howard A, Cheng Y, Dubovikov MS (2002) Ocean turbulence. Part II: vertical diffusivities of momentum, heat, salt, mass, and passive scalars. J Phys Oceanogr 32:240–264CrossRefGoogle Scholar
  11. Chapman DC, Brink KH (1987) Shelf and slope circulation induced by fluctuating offshore forcing. J Geophys Res 92:11741–11759CrossRefGoogle Scholar
  12. Chassignet EP, Smith L, Halliwell GR, Bleck R (2003) North Atlantic simulation with the hybrid coordinate ocean model (HYCOM): impact of the vertical coordinate choice and resolution, reference density, and thermobaricity. J Phys Oceanogr 33:2504–2526CrossRefGoogle Scholar
  13. Chassignet EP, Hurlburt HE, Smedstad OM, Halliwell GR, Hogan PJ, Wallcraft AJ, Bleck R (2006) Ocean prediction with the Hybrid Coordinate Ocean Model (HYCOM). In: Chassignet EP, Verron J (eds) Ocean weather forecasting: an integrated view of oceanography. Springer, Berlin, pp 413–426CrossRefGoogle Scholar
  14. Chassignet EP, Hurlburt HE, Smedstad OM, Halliwell GR, Hogan PJ, Wallcraft AJ, Bleck R (2007) Ocean Prediction with the HYbrid Coordinate Ocean Model (HYCOM). J Mar Syst 65:60–83CrossRefGoogle Scholar
  15. Cooper M, Haines K (1996) Altimetric assimilation with water property conservation. J Geophys Res 101:1059–1078CrossRefGoogle Scholar
  16. Cragg J, Mitchum G, Sturges W (1983) Wind-induced sea surface slopes on the West Florida Shelf. J Phys Oceanogr 13:2201–2212CrossRefGoogle Scholar
  17. Cummings JA (2005) Operational multivariate ocean data assimilation. Q J R Meteorol Soc 131:3583–3604CrossRefGoogle Scholar
  18. Fox DN, Teague WJ, Barron CN, Carnes MR, Lee CM (2002) The Modular Ocean Data Analysis System (MODAS). J Atmos Ocean Technol 19:240–252CrossRefGoogle Scholar
  19. Halliwell GR Jr (2004) Evaluation of vertical coordinate and vertical mixing algorithms in the hybrid-coordinate ocean model (HYCOM). Ocean Model 7:285–322CrossRefGoogle Scholar
  20. Halliwell GR Jr, Shay LK, Jacob SD, Smedstad OM, Uhlhorn EW (2008) Improving ocean model initialization for coupled tropical cyclone forecast models using GODAE nowcasts. Mon Weather Rev 136:2576–2591CrossRefGoogle Scholar
  21. He R, Weisberg RH (2002) Tides on the West Florida Shelf. J Phys Oceanogr 32:3455–3473CrossRefGoogle Scholar
  22. He R, Weisberg RH (2003) A loop current intrusion case study on the West Florida Shelf. J Phys Oceanogr 33:465–477CrossRefGoogle Scholar
  23. Hetland RD, Hsueh Y, Leben RR, Niiler PP (1999) A loop current-induced jet along the edge of the West Florida Shelf. Geophys Res Lett 26:2239–2242CrossRefGoogle Scholar
  24. Hodur RM, Pullen J, Cummings J, Hong X, Doyle D, Martin PJ, Rennick MA (2002) The Coupled Ocean/Atmospheric Mesoscale Prediction System (COAMPS). Oceanography 15:88–98Google Scholar
  25. Huh OK, Wiseman WJ, Vansant LL (1981) Intrusion of loop current waters onto the west Florida continental shelf. J Geophys Res 86:4186–4192CrossRefGoogle Scholar
  26. International GODAE Steering Team (2000) Global ocean data assimilation experiment strategic plan. GODAE Report #6, GODAE International Project Office, Bureau of Meteorology, Melbourne, Australia (26 pp)Google Scholar
  27. Jacobs GA, Barron CN, Rhodes RC (2001) Mesoscale characteristics. J Geophys Res 106:19,581–19,595Google Scholar
  28. Kelly KA, Chapman DC (1988) The response of stratified shelf and slope waters to steady offshore forcing. J Phys Oceanogr 18:906–925CrossRefGoogle Scholar
  29. Kourafalou VH, Peng G, Kang H, Hogan PJ, Smedstadt OM, Weisberg RH, Baringer MO, Meinen CS (2008) Evaluation of global ocean data assimilation experiment products on South Florida nested simulations with the Hybrid Coordinate Ocean Model. Ocean Dynamics (this issue)Google Scholar
  30. Large WG, Mc Williams JC, Doney SC (1994) Oceanic vertical mixing: a review and a model with a nonlocal boundary layer parameterization. Rev Geophys 32:363–403CrossRefGoogle Scholar
  31. Liu Y, Weisberg RH (2005) Patterns of ocean current variability on the West Florida Shelf using the self-organized map. J Geophys Res 110:C06003, doi:10,1029/2004JC002786 CrossRefGoogle Scholar
  32. Liu Y, Weisberg RH (2007) Ocean currents and sea surface heights estimated across the West Florida Shelf. J Phys Oceanogr 37:1697–1713CrossRefGoogle Scholar
  33. Marmorino GO (1983) Variability of currents, temperature, and bottom pressure across the West Florida continental shelf, winter 1981–1982. J Geophys Res 88:4439–4457CrossRefGoogle Scholar
  34. Mellor GL, Oey L-Y, Ezer T (1998) Sigma coordinate pressure gradient errors and the seamount problem. J Atmos Ocean Technol 15:1122–1131CrossRefGoogle Scholar
  35. Mitchum TG, Clarke AJ (1986a) The frictional nearshore response to forcing by synoptic scale winds. J Phys Oceanogr 16:934–946CrossRefGoogle Scholar
  36. Mitchum TG, Clarke AJ (1986b) Evaluation of frictional, wind forced long wave theory on the West Florida Shelf. J Phys Oceanogr 16:1029–1037CrossRefGoogle Scholar
  37. Mitchum TG, Sturges W (1982) Wind-driven currents on the West Florida Shelf. J Phys Oceanogr 12:1310–1317CrossRefGoogle Scholar
  38. Niiler PP (1976) Observations of low-frequency currents on the West Florida continental shelf. Mem Soc Roy Sci Leige 6:331–358Google Scholar
  39. Paluszkiewicz T, Atkinson L, Parmentier ES, McClain CS (1983) Observations of a loop current frontal eddy intrusion onto the West Florida Shelf. J Geophys Res 88:9639–9651CrossRefGoogle Scholar
  40. Shchepetkin AF, McWilliams JC (2003) A method for computing pressure-gradient force in an oceanic model with a non-aligned vertical coordinate. J Geophys Res 108:3090, doi:10.1029/2001JC001047 CrossRefGoogle Scholar
  41. Taylor KE (2001) Summarizing multiple aspects of model performance in a single diagram. J Geophys Res 106:7183–7192CrossRefGoogle Scholar
  42. Weisberg RH, He R (2003) Local and deep-ocean forcing contributions to anomalous water properties on the West Florida shelf. J Geophys Res 108(C6):15, doi:10.1029/2002JC001407 CrossRefGoogle Scholar
  43. Weisberg RH, Black BD, Li Z (2000) An upwelling case study on Florida’s west coast. J Geophys Res 105:11,459–11,469CrossRefGoogle Scholar
  44. Weisberg RH, Li Z, Muller-Karger F (2001) West Florida shelf response to local wind forcing: April 1998. J Geophys Res 106:31239–31262CrossRefGoogle Scholar
  45. Weisberg RH, He R, Kirkpatrick G, Muller-Karger F, Walsh JJ (2004) Coastal ocean circulation influences on remotely sensed optical properties: a West Florida Shelf case study. Oceanography 17:68–75Google Scholar
  46. Weisberg RH, He R, Liu Y, Virmani JI (2005) West Florida Shelf circulation on synoptic, seasonal, and interannual time scales. In: Circulation in the Gulf of Mexico: observations and models. Geophys Monogr 161:325–347Google Scholar
  47. Winther NG, Evensen G (2006) A hybrid coordinate ocean model for shelf sea simulation. Ocean Model 13:221–237CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • George R. HalliwellJr
    • 1
  • Alexander Barth
    • 2
  • Robert H. Weisberg
    • 3
  • Patrick Hogan
    • 4
  • Ole Martin Smedstad
    • 5
  • James Cummings
    • 6
  1. 1.MPO/RSMASUniversity of MiamiMiamiUSA
  2. 2.GHER/AGOUniversity of LiegeLiegeBelgium
  3. 3.University of South FloridaSt. PetersburgUSA
  4. 4.Naval Research LaboratoryStennis Space CenterUSA
  5. 5.QinetiQ North America, Technology Solutions Group, PSIStennis Space CenterUSA
  6. 6.Naval Research LaboratoryMontereyUSA

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