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The Vertical Structure of Eddy Heat Transport Simulated by an Eddy-Resolving OGCM
Bo Young et al.
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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
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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).
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• 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)
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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
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ResultDistribution of EKE and D-EHT
𝐸𝐾𝐸=12
(𝑢′𝑢′+𝑣′ 𝑣 ′ )
𝐷−𝐸𝐻𝑇=𝜌𝑐𝑝∫𝑇 ′𝑣 ′ 𝑑𝑧
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Zonally Integrated D-EHT
𝑣 ′𝑇 ′=−𝐴h𝜕𝑇 /𝜕 𝑦
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Distribution of He, Hd and HK
𝐻𝑒=∫𝑣 ′𝑇 ′ (𝑧 )/𝑣 ′𝑇 ′ (0)𝐻𝑑=𝑃𝑒𝑛𝑒𝑡𝑟𝑎𝑡𝑖𝑜𝑛 h𝑑𝑒𝑝𝑡 𝑜𝑓 𝐸𝐾𝐸 𝐻𝑘
𝐻𝑘= h𝑑𝑒𝑝𝑡 𝑎𝑡 𝐸𝐾𝐸 𝑑𝑒𝑐𝑟𝑒𝑎𝑠𝑒𝑠𝑡𝑜5×10− 3𝑚2𝑠− 2
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Seasonal variation of He, Hd and HK
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Comparison of the mirdional disrtribution
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Vertical profiles of the zonal average
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Effect of a seasonal thermocline on the structure of mesoscale eddy
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