气候变化领域集成服务门户(CCPortal): Half-precessional cycle of thermocline temperature in the western equatorial Pacific and its bihemispheric dynamics

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DOI	10.1073/pnas.1915510117
	Half-precessional cycle of thermocline temperature in the western equatorial Pacific and its bihemispheric dynamics
	Jian Z.; Wang Y.; Dang H.; Lea D.W.; Liu Z.; Jin H.; Yin Y.
发表日期	2020
ISSN	0027-8424
起始页码	7044
结束页码	7051
卷号	117 期号:13
英文摘要	The El Niño-Southern Oscillation (ENSO), which is tightly coupled to the equatorial thermocline in the Pacific, is the dominant source of interannual climate variability, but its long-term evolution in response to climate change remains highly uncertain. This study uses Mg/Ca in planktonic foraminiferal shells to reconstruct sea surface and thermoclinewater temperatures (SST and TWT) for the past 142 ky in a western equatorial Pacific (WEP) core MD01-2386. Unlike the dominant 100-ky glacial-interglacial cycle recorded by SST and δ18O, which echoes the pattern seen in other WEP sites, the upper ocean thermal gradient shows a clear half-precessional (9.4 ky or 12.7 ky) cycle as indicated by the reconstructed and simulated temperature (ΔT) and δ18O differences between the surface and thermocline waters. This phenomenon is attributed to the interplay of subtropical-totropical thermocline anomalies forced by the antiphased meridional insolation gradients in the two hemispheres at the precessional band. In particular, the TWT shows greater variability than SST, and dominates the ΔT changes which couple with the west-east SST difference in the equatorial Pacific at the half-precessional band, implying a decisive role of the tropical thermocline in orbital-scale climate change. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Half-precession; Meridional gradient; Thermocline temperature; Western equatorial Pacific
语种	英语
scopus关键词	calcium; magnesium; oxygen 18; sea water; surface water; animal shell; Article; climate change; Eastern Hemisphere; environmental temperature; glacier; interglacial; nonhuman; Pacific Ocean; phenomenology; plankton; priority journal; sea surface temperature; simulation; temperature measurement; thermocline; thermocline water temperature; thermodynamics; tropics; water temperature; Western Hemisphere
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159027
作者单位	Jian, Z., State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China; Wang, Y., State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China; Dang, H., State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China; Lea, D.W., Department of Earth Science, University of California, Santa Barbara, CA 93106, United States; Liu, Z., Department of Geography, Ohio State University, Columbus, OH 43210, United States; Jin, H., State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China; Yin, Y., State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China
推荐引用方式 GB/T 7714	Jian Z.,Wang Y.,Dang H.,et al. Half-precessional cycle of thermocline temperature in the western equatorial Pacific and its bihemispheric dynamics[J],2020,117(13).
APA	Jian Z..,Wang Y..,Dang H..,Lea D.W..,Liu Z..,...&Yin Y..(2020).Half-precessional cycle of thermocline temperature in the western equatorial Pacific and its bihemispheric dynamics.Proceedings of the National Academy of Sciences of the United States of America,117(13).
MLA	Jian Z.,et al."Half-precessional cycle of thermocline temperature in the western equatorial Pacific and its bihemispheric dynamics".Proceedings of the National Academy of Sciences of the United States of America 117.13(2020).