气候变化领域集成服务门户(CCPortal): Relative contributions of heat flux and wind stress on the spatiotemporal upper-ocean variability in the tropical Indian Ocean

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DOI	10.1088/1748-9326/ab9f7f
	Relative contributions of heat flux and wind stress on the spatiotemporal upper-ocean variability in the tropical Indian Ocean
	Yuan X.; Ummenhofer C.C.; Seo H.; Su Z.
发表日期	2020
ISSN	17489318
卷号	15 期号:8
英文摘要	High-resolution ocean general circulation model (OGCM) simulations are employed to investigate interannual variability of the upper-ocean temperature in the tropical Indian Ocean (20°S-20°N). The seasonal cycle and interannual variability in the upper-ocean temperature in the tropical Indian Ocean in the forced ocean simulation are in good agreement with available observation and reanalysis products. Two further sensitivity OGCM simulations are used to separate the relative contributions of heat flux and wind stress. The comparison of the model simulations reveals the depth-dependent influences of heat flux and wind stress on the ocean temperature variability in the tropical Indian Ocean. Generally, heat flux dominates the temperature variability in the top 30 m, while wind stress contributes most strongly to the subsurface temperature variability below 30 m. This implies that a transition depth should exist at each location, where the dominant control of the ocean temperature variability switched from heat flux to wind stress. We define the depth of this transition point as the 'crossing depth' and make use of this concept to better understand the depth-dependent impacts of the heat flux and wind stress on the upper-ocean temperature variability in the tropical Indian Ocean. The crossing depth tends to be shallower in the southern tropical Indian Ocean (20°S-EQ), including the Seychelles-Chagos Thermocline Ridge (SCTR) and the eastern part of the Indian Ocean Dipole (IOD), suggesting the dominance of forcing due to wind stress and the resulting ocean dynamical processes in the temperature variability in those regions. The crossing depth also shows prominent seasonal variability in the southern tropical Indian Ocean. In the SCTR, the variability of the subsurface temperature forced by the wind stress dominates largely in boreal winter and spring, resulting in the shallow crossing depth in these seasons. In contrast, the intensified subsurface temperature variability with shallow crossing depth in the eastern part of the IOD is seen during boreal autumn. Overall, our results suggest that the two regions within the tropical Indian Ocean, the SCTR and the eastern part of the IOD, are the primary locations where the ocean dynamics due to wind-stress forcing control the upper-ocean temperature variability. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	heat flux; interannual variability; subsurface temperature; tropical Indian Ocean; wind stress
语种	英语
scopus关键词	Oceanography; Tropics; Wind stress; Indian ocean dipoles; Interannual variability; Ocean general circulation models; Relative contribution; Seasonal variability; Subsurface temperature; Temperature variability; Tropical Indian ocean; Heat flux; air-sea interaction; annual variation; heat flux; spatiotemporal analysis; water depth; water temperature; wind stress; Indian Ocean; Indian Ocean (Tropical)
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153863
作者单位	Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, Netherlands; Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
推荐引用方式 GB/T 7714	Yuan X.,Ummenhofer C.C.,Seo H.,et al. Relative contributions of heat flux and wind stress on the spatiotemporal upper-ocean variability in the tropical Indian Ocean[J],2020,15(8).
APA	Yuan X.,Ummenhofer C.C.,Seo H.,&Su Z..(2020).Relative contributions of heat flux and wind stress on the spatiotemporal upper-ocean variability in the tropical Indian Ocean.Environmental Research Letters,15(8).
MLA	Yuan X.,et al."Relative contributions of heat flux and wind stress on the spatiotemporal upper-ocean variability in the tropical Indian Ocean".Environmental Research Letters 15.8(2020).