气候变化领域集成服务门户(CCPortal): Regional Trends in Southern Ocean Eddy Kinetic Energy

CCPortal

DOI	10.1029/2020JC016973
	Regional Trends in Southern Ocean Eddy Kinetic Energy
	Zhang Y.; Chambers D.; Liang X.
发表日期	2021
ISSN	21699275
卷号	126 期号:6
英文摘要	Previous model-based studies and observation-based studies suggest that increasing wind energy input into the Southern Ocean will primarily cause increases in eddy kinetic energy (EKE) with no significant change in the mean circulation, a result that has been named the “eddy-saturation” hypothesis. However, due to the sparsity of the available observations, quantifying and understanding regional EKE changes in the Southern Ocean is challenging. In this study, we examine regional trends in the Southern Ocean EKE using altimetry crossover measurements and an ocean reanalysis product to quantify if undersampling by altimetry will bias EKE trend estimates and to test if previously observed EKE trends are homogenous throughout the Southern Ocean or concentrated in a few regions. To verify that the EKE computed from altimetry crossovers accurately represents yearly averaged EKE over the Southern Ocean, we first conduct a sampling experiment with the HYCOM Global Ocean Forecasting System 3.1 ocean reanalysis. We find that the crossover sampling is sufficient to represent the yearly averaged EKE when averaged over sectors of at least 30° of longitude. We find no coherent increase in EKE over the entire Southern Ocean from altimetry crossover measurements, but instead find significant EKE increase over only one region, primarily south of New Zealand and downstream of the Campbell Plateau. We conclude that the EKE change in the Southern Ocean is not as homogenous as implied by previous studies and more work is needed to understand if this is consistent with the “eddy-saturation” hypothesis or related more to local dynamics. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	climate change; eddy kinetic energy; long-term trends; sampling experiment; Southern Ocean
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/186271
作者单位	School of Marine Science and Policy, University of Delaware, Lewes, DE, United States; College of Marine Science, University of South Florida, St Petersburg, FL, United States
推荐引用方式 GB/T 7714	Zhang Y.,Chambers D.,Liang X.. Regional Trends in Southern Ocean Eddy Kinetic Energy[J],2021,126(6).
APA	Zhang Y.,Chambers D.,&Liang X..(2021).Regional Trends in Southern Ocean Eddy Kinetic Energy.Journal of Geophysical Research: Oceans,126(6).
MLA	Zhang Y.,et al."Regional Trends in Southern Ocean Eddy Kinetic Energy".Journal of Geophysical Research: Oceans 126.6(2021).