Nonlocality of scale-dependent eddy mixing at the Kuroshio Extension

نویسندگان

چکیده

Although eddy parameterization schemes are often based on the local assumption, previous studies indicate that nonlocality of total mixing is prevalent at Kuroshio Extension (KE). For eddy-permitting climate models, only induced by eddies smaller than resolvable scale models ( L* ) needs to be parameterized. Therefore, here we aim estimate and predict scale-dependent KE region. We consider separation id="im2">L* ranging from id="im3">0.2∘ id="im4">2.5∘ , which comparable typical resolution ocean component models. Using a submesoscale-permitting model solution (MITgcm llc4320) Lagrangian particles, (SDM) ellipses then diagnose square root ellipse area id="im5">Ln,particle ). id="im6">Ln,particle metric quantify degree SDM nonlocality. found that, for all available id="im7">L* values consider, in region, mostly elevated id="im8">Ln,particle occur within jet. As id="im9">L* decreases id="im10">2.5∘ id="im11">0.2∘ ratio id="im12">Ln,particle/L* increases 0.8 8.9. This result indicates more non-negligible id="im13">L* corresponds with relatively high resolution. prediction, compared conventional scaling curve-fitting methods, random forest approach can better represent id="im14">Ln,particle especially coastal regions intense The Eulerian momentum well capture spatial pattern, but not magnitude, id="im15">Ln,particle . Our efforts suggest may improved taking into account

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ژورنال

عنوان ژورنال: Frontiers in Marine Science

سال: 2023

ISSN: ['2296-7745']

DOI: https://doi.org/10.3389/fmars.2023.1137216