Observed Surface Trapping of Near-inertial Waves over the Mid-Ocean Ridge in the North Atlantic Driven By Doppler Shift
编号:511 访问权限:仅限参会人 更新:2026-08-31 16:58:08 浏览:0次 张贴报告

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摘要

Wind-forced near-inertial waves (NIWs) transfer atmospheric energy into the ocean interior. Observations over the North Atlantic Mid-Ocean Ridge show that this pathway can be strongly suppressed, even in anticyclonic vorticity that typically favors downward radiation. In this study, we provide observational evidence that such surface trapping of NIWs is associated with eddy-driven Doppler shift (\(\omega_i=\omega_{obs}-\mathbf{k} \cdot \mathbf{u}\)) using nine-month mooring measurements in the mid-Atlantic ridge. The two longest energetic stages were strongly surface trapped: only 18.06% and 32.14% of near-inertial kinetic energy (NIKE) penetrated below the mixed layer, despite persistent negative vorticity and weak horizontal propagation. Scale-dependent wind work and modal decomposition show that compact 300-600 km wind forcing excited higher-mode NIWs, with modes 2-4 accounting for approximately 70% and 71% of total NIKE in Stages 1 and 2, respectively. These large horizontal wavenumbers amplified the Doppler-shift effect of eddy-induced vertical shear, lowering their mean intrinsic frequencies relative to \(f_{\mathrm{eff}}\) by 0.0114f and 0.0785f, thereby inhibiting downward propagation and redirecting wind-injected near-inertial energy toward the upper ocean. Our study highlights an eddy-mediated control on the delivery of wind-injected near-inertial energy to depth, with implications for estimates of the energy available for deep-ocean mixing.

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报告人
Zhengyu Deng
SUN YET-SAN UNIVERSITY

稿件作者
Zhengyu Deng SUN YET-SAN UNIVERSITY
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重要日期
  • 会议日期

    01月12日

    2027

    01月15日

    2027

  • 07月21日 2026

    初稿截稿日期

  • 01月15日 2027

    注册截止日期

主办单位
State Key Laboratory of Marine Environmental Science, Xiamen University (MEL)
Department of Earth Sciences, National Natural Science Foundation of China (NSFC)
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