研究人员称，环流尺度和中等尺度之间的海洋动能传输是由大气的Hadley、Ferrel和polar单元诱发，热带辐合带引起强烈的低尺度动能传输。在120 km的中等尺度上，高端传输的峰值为300千兆瓦，大约是风输入海洋环流能量的三分之一。
近四分之三的“级联”发生在南纬15度以南，几乎贯穿了整个水柱。中等尺度级联具有自相似的季节周期，特征滞后时间长度尺度每八度的天数约为27天；春季跨50 km高峰传输，夏季跨500 km高峰传输。这些中等尺度的动能遵循相同的周期，但在峰值级联后约40天达到峰值，表明跨尺度传输的能量，主要沉积在一个比其大4倍的尺度上。
据介绍，本研究提出了一个从10-40,000 km范围内，海洋动能（KE）全球尺度传输的估计值。
附：英文原文
Title: Global cascade of kinetic energy in the ocean and the atmospheric imprint
Author: Benjamin A. Storer, Michele Buzzicotti, Hemant Khatri, Stephen M. Griffies, Hussein Aluie
Issue&Volume: 2023-12-22
Abstract: Here, we present an estimate for the ocean's global scale transfer of kinetic energy (KE), across scales from 10 to 40,000 km. Oceanic KE transfer between gyre scales and mesoscales is induced by the atmosphere’s Hadley, Ferrel, and polar cells, and the intertropical convergence zone induces an intense downscale KE transfer. Upscale transfer peaks at 300 gigawatts across mesoscales of 120 km in size, roughly one-third the energy input by winds into the oceanic general circulation. Nearly three quarters of this “cascade” occurs south of 15°S and penetrates almost the entire water column. The mesoscale cascade has a self-similar seasonal cycle with characteristic lag time of ≈27 days per octave of length scales; transfer across 50 km peaks in spring, while transfer across 500 km peaks in summer. KE of those mesoscales follows the same cycle but peaks ≈40 days after the peak cascade, suggesting that energy transferred across a scale is primarily deposited at a scale four times larger.
DOI: adi7420
Source: https://www.science.org/doi/10.1126/sciadv.adi7420