气候变化领域集成服务门户(CCPortal): Diagnosing the development of seasonal stratification using the potential energy anomaly in the North Pacific

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DOI	10.1007/s00382-019-04816-y
	Diagnosing the development of seasonal stratification using the potential energy anomaly in the North Pacific
	Yamaguchi R.; Suga T.; Richards K.J.; Qiu B.
发表日期	2019
ISSN	0930-7575
起始页码	4667
结束页码	4681
卷号	53 期号:2020-07-08
英文摘要	Upper-ocean seasonal stratification (seasonal pycnocline and/or transition layer) is a ubiquitous feature and its vertical structure has large spatial variability. The density stratification regulates the stability of the upper ocean and thus can affect the oceanic response to atmospheric forcing and biogeochemical processes by modulating vertical mixing. In this study, we described the development of the seasonal stratification in terms of the stability of the water column, using the potential energy anomaly (PEA) as a metric based on Argo profiles. PEA budget analysis reveals that over most of the North Pacific, seasonal stratification develops under a vertical one-dimensional energy balance between an increase in PEA (i.e., a strengthening of the stratification) driven by atmospheric buoyancy forcing and a decrease in PEA associated with vertical mixing within the water column. Horizontal advection of PEA plays a significant role in the seasonal development of the stratification only in the regions of the western boundary current and equatorial current system south of 10°N. We find that, in addition to the total magnitude of the oceanic buoyancy gain, the balance between compositions of the atmospheric forcing (non-penetrating surface buoyancy forcing and penetrating radiative heating) is also important in explaining regional differences in the development of the seasonal stratification. The vertical diffusivity in the seasonal stratification estimated from the residual of the PEA budget is in the range from 5 × 10−5 m2 s−1 to 5 × 10−4 m2 s−1 and shows spatial and seasonal variability associated with local wind forcing. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
语种	英语
scopus关键词	air-sea interaction; Argo; buoyancy forcing; energy balance; potential energy; seasonal variation; stratification; water column; Pacific Ocean; Pacific Ocean (North)
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145959
作者单位	Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan; Research and Development Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan; International Pacific Research Center, University of Hawaii at Manoa, Honolulu, HI, United States; Department of Oceanography, University of Hawaii at Manoa, Honolulu, HI, United States
推荐引用方式 GB/T 7714	Yamaguchi R.,Suga T.,Richards K.J.,et al. Diagnosing the development of seasonal stratification using the potential energy anomaly in the North Pacific[J],2019,53(2020-07-08).
APA	Yamaguchi R.,Suga T.,Richards K.J.,&Qiu B..(2019).Diagnosing the development of seasonal stratification using the potential energy anomaly in the North Pacific.Climate Dynamics,53(2020-07-08).
MLA	Yamaguchi R.,et al."Diagnosing the development of seasonal stratification using the potential energy anomaly in the North Pacific".Climate Dynamics 53.2020-07-08(2019).