红海北部的次主题尺度过程:水下滑翔机观测的启示

IF 3.3 2区 地球科学 Q1 OCEANOGRAPHY
Fushuo Chu, Xiaolong Yu, George Krokos, Ibrahim Hoteit, Khaled Asfahani, Peng Zhan
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引用次数: 0

摘要

大洋次中尺度海流在促进能量级联、调节生物地球化学过程和上层海洋热量收支方面的关键作用已得到广泛认可。虽然高分辨率数值模拟能够定性研究北红海(NRS)亚主题过程的时空变化,但观测证据仍然很少。本研究通过水下滑翔机的实地观测,调查了北红海的次中尺度过程。高分辨率滑翔机和卫星观测数据集揭示了冬季次主题尺度锋的时空变化特征和混合层深度的加深。对潜在涡度(PV)的诊断和对亚主题尺度不稳定性的分类显示了混合层条纹、引力和对称不稳定性的有利条件。与强锋面相关的大气冷却所引起的显著负 PV 促进了副热带尺度过程的发展。将欧米茄方程与生物地球化学观测结果相结合表明,通过次中尺度过程的连贯路径可导致生物量和氧气斑块的垂直传输,为透光层提供营养物质,并为深层缺氧水域通风。这些结果表明了次尺度过程在 NRS 海洋动力学中的基本作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Submesoscale Processes in the Northern Red Sea: Insights From Underwater Glider Observations

The critical role of oceanic submesoscale currents in promoting energy cascade and modulating biogeochemical processes as well as the heat budget in the upper ocean has gained wide recognition. Although high-resolution numerical simulations have enabled qualitative investigation of the spatiotemporal variability of submesoscale processes in the north Red Sea (NRS), observational evidence remains scarce. This study investigated the submesoscale processes in the NRS through field observations of underwater gliders. High-resolution glider and satellite observation data sets reveal the spatiotemporal variation characteristics of submesoscale fronts and deepen mixed layer depth during winter. Diagnosis of potential vorticity (PV) and classifications of submesoscale instabilities demonstrate conducive conditions for the mixed layer baroclinic, gravitational, and symmetric instability. The significant negative PV induced by atmospheric cooling associated with robust fronts promotes the development of submesoscale processes. Combining the Omega equation with biogeochemical observations suggests that coherent pathways via submesoscale processes lead to the vertical transport of biomass and oxygen patches, supplying nutrients into the euphotic layer and ventilating hypoxic waters at depths. These results demonstrate the fundamental role of submesoscale processes in the ocean dynamics of the NRS.

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来源期刊
Journal of Geophysical Research-Oceans
Journal of Geophysical Research-Oceans Earth and Planetary Sciences-Oceanography
CiteScore
7.00
自引率
13.90%
发文量
429
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