气候变化领域集成服务门户(CCPortal): Small-Scale Variability of Bottom Oxygen in the Northern Gulf of Mexico

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DOI	10.1029/2020JC016279
	Small-Scale Variability of Bottom Oxygen in the Northern Gulf of Mexico
	Ruiz Xomchuk V.; Hetland R.D.; Qu L.
发表日期	2021
ISSN	21699275
卷号	126 期号:1
英文摘要	While the occurrence of seasonal bottom hypoxia in the Northern Gulf of Mexico is an extensively studied subject, most research effort has been put on understanding and quantifying hypoxic extent, and little is known about internal variability and short-term shifts. We use a realistic hydrodynamic model with a simple oxygen parametrization to demonstrate that hypoxia development in the far-field of the Mississippi plume is subject to physical processes with spatial scales ranging from (Formula presented.) (10) to (Formula presented.) (100 km) and temporal scales from the near-inertial period to seasonality. We use a budget decomposition of the oxygen equation to explore patterns. The mean spatial structure of the local rate of change reveals features shaped as oxygen loss rings enclosing oxygenation cores. This structure is mainly a balance between net advection (horizontal and vertical) and sediment oxygen demand. In terms of temporal variability, we found a large near-inertial signal in advection, following a convergence-divergence pattern, at all spatial scales, and a strong subinertial signal at smaller scales only. Variability in advection increases with decreasing temporal and spatial scales, consistently with a field rich in instabilities introducing small-scale, strong anomalies. Through a Reynolds decomposition of the budget, we separate anomalies from the main flow and identify the total vertical perturbation flux as the primary counterbalance to sediment oxygen demand during periods when the hypoxic extent is maintained or destroyed. Vertical flux anomalies manifest as bottom water intrusions into the mid water column, which have been captured by high-resolution observations. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	coastal hypoxia; numerical modeling; oxygen advection; oxygen budget; submesoscale; Texas-Louisiana shelf
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186522
作者单位	Department of Oceanography, Texas A&M University, College Station, TX, United States; Department of Earth System Science, Stanford University, Stanford, CA, United States
推荐引用方式 GB/T 7714	Ruiz Xomchuk V.,Hetland R.D.,Qu L.. Small-Scale Variability of Bottom Oxygen in the Northern Gulf of Mexico[J],2021,126(1).
APA	Ruiz Xomchuk V.,Hetland R.D.,&Qu L..(2021).Small-Scale Variability of Bottom Oxygen in the Northern Gulf of Mexico.Journal of Geophysical Research: Oceans,126(1).
MLA	Ruiz Xomchuk V.,et al."Small-Scale Variability of Bottom Oxygen in the Northern Gulf of Mexico".Journal of Geophysical Research: Oceans 126.1(2021).