Evolving Interior Mixing Regimes in a Tidal River Plume

Evolving Interior Mixing Regimes in a Tidal River Plume
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潮汐河羽流中不断变化的内部混合机制

DOI:
10.1029/2022gl099633
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发表时间:
2022
影响因子:
5.2
通讯作者:
Whitney, Michael M.
Whitney, Michael M.
中科院分区:
地球科学1区
文献类型:
--
作者:
Spicer, Preston;Huguenard, Kimberly;Cole, Kelly L.;MacDonald, Daniel G.;Whitney, Michael M.

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利用微观结构分析来估计平静风中梅里马克河羽流内部潮汐脉冲期间的垂直混合(通过垂直湍流浮力通量)。多个分层剪切混合状态出现并随着时间的推移而演变。最初,羽流充当近场射流,在羽流中混合(羽流层混合)并在羽流-环境界面上混合(近场界面混合)。随着羽流的增长,由于水流减慢,近场近海的界面混合受到抑制,从而减少了羽流和陆架之间的湍流交换。在退潮结束时,周围的潮汐流在羽流下方反向,启动另一种内部界面混合模式(此处称为潮汐界面混合),从而允许羽流和近海环境水域之间进行交换。这项工作强调了先前未报道的河流羽流近场和中场内的潮汐调节混合。
Microstructure profiling was utilized to estimate vertical mixing (via vertical turbulent buoyancy flux) during a tidal pulse in the interior Merrimack River plume in calm winds. Multiple stratified shear mixing regimes appear and evolve with time. Initially the plume acts as a nearfield jet, with mixing in the plume (plume layer mixing) and over the plume‐ambient interface (nearfield interfacial mixing). As the plume grows, interfacial mixing is suppressed offshore of the nearfield as currents slow, diminishing turbulent exchange between plume and shelf. At the end of ebb, ambient tidal currents reverse direction below plume, initiating another mode of internal, interfacial mixing (coined here as tidal interfacial mixing), allowing exchange between plume and ambient waters offshore. This work highlights previously unreported tidally modulated mixing within the near and midfield of a river plume.
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