气候变化领域集成服务门户(CCPortal): Dynamical Ocean Response Controlling the Eastward Movement of a Heat Content Anomaly Caused by the 18.6-Year Modulation of Localized Tidally Induced Mixing

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DOI	10.1029/2019JC015513
	Dynamical Ocean Response Controlling the Eastward Movement of a Heat Content Anomaly Caused by the 18.6-Year Modulation of Localized Tidally Induced Mixing
	Osafune S.; Kouketsu S.; Masuda S.; Sugiura N.
发表日期	2020
ISSN	21699275
卷号	125 期号:2
英文摘要	Numerical experiments based on a long-term ocean state estimate have been used in previous work to demonstrate that the 18.6-year modulation of localized tidally induced vertical mixing can influence wintertime sea surface temperature (SST) over a broad area of the northern North Pacific, and may play a role in determining the spatial structure of the Pacific Decadal Oscillation (PDO). This study investigates the mechanism driving the model annual mean surface layer heat content anomaly (SHCa), which is correlated with the SST anomaly, at a location near the center of the PDO in the eastern Pacific. The modulation of mixing first induces an 18.6-year oscillatory SHCa in the western boundary region, which moves eastward along the boundary between the subtropical and subarctic gyres, taking (Formula presented.) 10 years to reach the eastern region. Adjoint sensitivity analysis is applied to confirm the importance of the dynamical response of the ocean to the eastward motion of the SHCa. It is shown that the generation of a temperature anomaly by wave-related current anomalies works to delay the eastward motion of the SHCa. Results also suggest that the generation of a spiciness anomaly in the open ocean may play a role. Although further studies are required to clarify whether the mixing modulation has an impact on the actual climate variability, the mechanism can be applied to any location along an eastward current, independent of the periodicity of the phenomena, and thus might have wide applicability in efforts to understand the role of the ocean in the climate system. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	18.6-year modulation of tidally induced mixing; adjoint sensitivity analysis; bidecadal variability in surface heat content; dynamical response of the ocean; eastward moving Rossby waves; Pacific decadal variability
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/186969
作者单位	Research Institute for Global Change, JAMSTEC, Yokosuka, Japan
推荐引用方式 GB/T 7714	Osafune S.,Kouketsu S.,Masuda S.,et al. Dynamical Ocean Response Controlling the Eastward Movement of a Heat Content Anomaly Caused by the 18.6-Year Modulation of Localized Tidally Induced Mixing[J],2020,125(2).
APA	Osafune S.,Kouketsu S.,Masuda S.,&Sugiura N..(2020).Dynamical Ocean Response Controlling the Eastward Movement of a Heat Content Anomaly Caused by the 18.6-Year Modulation of Localized Tidally Induced Mixing.Journal of Geophysical Research: Oceans,125(2).
MLA	Osafune S.,et al."Dynamical Ocean Response Controlling the Eastward Movement of a Heat Content Anomaly Caused by the 18.6-Year Modulation of Localized Tidally Induced Mixing".Journal of Geophysical Research: Oceans 125.2(2020).