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    Hydraulics and mixing of the deep overflow in the Lifamatola Passage of the Indonesian Seas

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    Article (1.745Mb)
    Date
    2020-09-01
    Author
    Tan, Shuwen  Concept link
    Pratt, Lawrence J.  Concept link
    Yuan, Dongliang  Concept link
    Li, Xiang  Concept link
    Wang, Zheng  Concept link
    Li, Yao  Concept link
    Corvianawatie, Corry  Concept link
    Surinati, Dewi  Concept link
    Budiman, Asep S.  Concept link
    Bayhaqi, Ahmad  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/26882
    As published
    https://doi.org/10.1175/JPO-D-19-0326.1
    DOI
    10.1175/JPO-D-19-0326.1
    Keyword
     Diapycnal mixing; Entrainment; Internal waves; Topographic effects; In situ oceanic observations 
    Abstract
    Hydrographic measurements recently acquired along the thalweg of the Lifamatola Passage combined with historical moored velocity measurements immediately downstream of the sill are used to study the hydraulics, transport, mixing, and entrainment in the dense overflow. The observations suggest that the mean overflow is nearly critical at the mooring site, suggesting that a weir formula may be appropriate for estimating the overflow transport. Our assessment suggests that the weir formulas corresponding to a rectangular, triangular, or parabolic cross section all result in transports very close to the observation, suggesting their potential usage in long-term monitoring of the overflow transport or parameterizing the transport in numerical models. Analyses also suggest that deep signals within the overflow layer are blocked by the shear flow from propagating upstream, whereas the shallow wave modes of the full-depth continuously stratified flow are able to propagate upstream from the Banda Sea into the Maluku Sea. Strong mixing is found immediately downstream of the sill crest, with Thorpe-scale-based estimates of the mean dissipation rate within the overflow up to 1.1 × 10−7 W kg−1 and the region-averaged diapycnal diffusivity within the downstream overflow in the range of 2.3 × 10−3 to 10.1 × 10−3 m2 s−1. Mixing in the Lifamatola Passage results in 0.6–1.2-Sv (1 Sv ≡ 106 m3 s−1) entrainment transport added to the overflow, enhancing the deep-water renewal in the Banda Sea. A bulk diffusivity coefficient estimated in the deep Banda Sea yields 1.6 × 10−3 ± 5 × 10−4 m2 s−1, with an associated downward turbulent heat flux of 9 W m−2.
    Description
    Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 50(9),(2020): 2797-2814, https://doi.org/10.1175/JPO-D-19-0326.1.
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    • Physical Oceanography (PO)
    Suggested Citation
    Tan, S., Pratt, L. J., Yuan, D., Li, X., Wang, Z., Li, Y., Corvianawatie, C., Surinati, D., Budiman, A. S., & Bayhaqi, A. (2020). Hydraulics and mixing of the deep overflow in the Lifamatola Passage of the Indonesian Seas. Journal of Physical Oceanography, 50(9), 2797-2814.
     
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