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The Vertical Structure of Eddy Heat Transport Simulated by an Eddy-Resolving OGCM

The Vertical Structure of Eddy Heat Transport Simulated by an Eddy-Resolving OGCM. Bo Young et al. Outline. Introduction Model description Result Distribution of EKE and D-EHT Distribution of H e , H d and H K Seasonal variation of H e , H d and H K

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The Vertical Structure of Eddy Heat Transport Simulated by an Eddy-Resolving OGCM

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  1. The Vertical Structure of Eddy Heat Transport Simulated by an Eddy-Resolving OGCM Bo Young et al.

  2. Outline • Introduction • Model description • Result • Distribution of EKE and D-EHT • Distribution of He, Hd and HK • Seasonal variation of He, Hd and HK • Vertical profiles of the zonally averaged T, EKE EHT • Effect of a seasonal thermocline on the structure of mesoscale eddy • Conclusion

  3. Introduction • Heat transport by mesoscale eddy or eddy heat transport(EHT) constitutes an important part in meridional heat transport in the ocean (Wunsch 1999,and Roemmich and Gilson 2001) • Since the information below the sea surface is not available from Satellite, an assumption is introduced for the vertical, structure depth integrated value of EHT(D-EHT)(Stammer 1998).

  4. Qiu and Chen assumed that the effective depth of EHT (He:=D-EHT/EHTsurface) is constant. • To resolve the mesoscale eddy and estimation of D-EHT require the resolution of 1/10 degree(Meijers et al. 2007) • The clarification of the vertical structure of EHT provides essential information for the parameterization of lateral mixing in coarse-resolution OGCMs (Killworth 1998)

  5. Model • Research Institute for Applied Mechanics Ocean Model • Pacific ocean model covers 50S-65N, 95E-70W, 70 vertical level, 1/12 degree. • Advection momentum: the generalized Arakawa scheme (ishizaki and Motoi 1999). • Vertical mixings : Noh scheme • Input data: WOA94 climatological mean temperature and salinity. • Model integrated : 25 years

  6. ResultDistribution of EKE and D-EHT

  7. Zonally Integrated D-EHT

  8. Distribution of He, Hd and HK

  9. Seasonal variation of He, Hd and HK

  10. Comparison of the mirdionaldisrtribution

  11. Vertical profiles of the zonal average

  12. Effect of a seasonal thermocline on the structure of mesoscale eddy

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