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Wanli Wu, William Large and Gokhan Danabasoglu National Center for Atmospheric Research

Preliminary Results from the Global Ocean Simulations with the Baringer-Price-Yang Marginal Sea Boundary Condition Model. Wanli Wu, William Large and Gokhan Danabasoglu National Center for Atmospheric Research wanliwu@ucar.edu OUTLINE

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Wanli Wu, William Large and Gokhan Danabasoglu National Center for Atmospheric Research

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  1. Preliminary Results from the Global Ocean Simulations with the Baringer-Price-Yang Marginal Sea Boundary Condition Model Wanli Wu, William Large and Gokhan Danabasoglu National Center for Atmospheric Research wanliwu@ucar.edu OUTLINE Baringer-Price-Yang Marginal Sea Boundary Condition (MSBC) model Implementation of the MSBC model into POP Preliminary Results Ongoing and Future work

  2. The Strait of Gibraltar • Geometry parameters: • Location: (36N,6W) • Width (W): 20km • Sill depth (D): 280m • Shelf-slope break (ssb) depth: 400m • Slope of ssb: 0.012

  3. The MSBC model(Baringer & Price, 1997, Price & Yang, 1997) • Exchange dynamics(Bryden & Stommel, 1984; Bryden & Kinder, 1991) • Outflow/inflow fluxes: Ms=-Mi = 0.07 g ’1/2 D 3/2 W, g’=g(rs-ri)/rs • Entrainment & Product: (Baringer & Price, 1994; Price and Yang, 1997) • Entrainment rate~~ Froude numberF=g’a/f (g’h)1/2 • Product water flux is given by Mp=MsF2/3 • Entrained water flux is then given by Me=-(Mp+Mi) • Their steady MSBC process model requires • Climatological T & S profiles from the open ocean water properties, and • Climatological fresh water flux (E-P) and heat flux (Q) of the marginal sea to derive density difference (rs-ri) then --> mass transport (volume fluxes)

  4. Implementation of the MSBC model into POP • Implementation of the process model into POP (~3o) to simulate water transport crossing the Gibraltar Strait • The strait is currently closed in the model • Use instantaneous Ti, Ts, Siand Ss from model instead of climatological Ti, Si, E-P and Q, • Time-varying MSBC, • Based on T & S profiles to compute density difference , then volume fluxes: Ms (Mi), Me and Mp • From volume fluxes --> velocity (Ui, Us, Ue, Up), then replace the zero velocity and (T&S) fluxes (UT, US) on the open ocean and marginal sea interface. • Experiments: 50-year POP runs with/without MSBC

  5. Outflow water properties

  6. Summary • A time-dependent Marginal Sea Boundary Condition (MSBC) model was implemented to an OGCM, and applied for the Gibraltar Strait overflow. • The model with MSBC simulated reasonable water properties and seasonal cycle of the water exchange through the Strait. • The model with MSBC also realistically reproduced the warm and saline tongue in the North Atlantic.

  7. Ongoing Research and Future Work (open for discussion!) • Testing the same scheme in POP with higher resolution (~1o with open strait) • Implement the MSBC into other places like Faroe Bank Channel, Denmark Strait. • Long-term ocean alone simulation • Coupled simulation for climate impact study

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