气候变化领域集成服务门户(CCPortal): Dampened El Niño in the Early Pliocene Warm Period

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DOI	10.1029/2019GL085504
	Dampened El Niño in the Early Pliocene Warm Period
	White S.M.; Ravelo A.C.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:4
英文摘要	El Niño-Southern Oscillation (ENSO) is the strongest mode of interannual climate variability, and its predicted response to anthropogenic climate change remains unclear. Determining ENSO's sensitivity to climatic mean state and the strength of positive and negative feedbacks, notably the thermocline feedback, will help constrain its future behavior. To this end, we collected ENSO proxy data from the early and mid-Pliocene, a time during which tropical Pacific zonal and vertical temperature gradients were much lower than today. We found that El Niño events had a reduced amplitude throughout the early Pliocene, compared to the late Holocene. By the mid-Pliocene, El Niño amplitude was variable, sometimes reduced and sometimes similar to the late Holocene. This trend in Pliocene ENSO amplitude mirrors the long-term strengthening of zonal and vertical temperature gradients and verifies model results showing dampened ENSO under reduced gradients due to a weaker thermocline feedback. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Atmospheric pressure; Prisms; Stream flow; Thermal gradients; Anthropogenic climate changes; ENSO; foraminifera; Interannual climate variability; ODP 849; Paleoceanography; Southern oscillation; Vertical temperature gradients; Climate change; climate change; El Nino-Southern Oscillation; foraminifera; Holocene; paleoceanography; Pliocene; Pacific Ocean; Pacific Ocean (Tropical); Foraminifera
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170661
作者单位	Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA, United States; Department of Ocean Sciences, University of California, Santa Cruz, CA, United States
推荐引用方式 GB/T 7714	White S.M.,Ravelo A.C.. Dampened El Niño in the Early Pliocene Warm Period[J],2020,47(4).
APA	White S.M.,&Ravelo A.C..(2020).Dampened El Niño in the Early Pliocene Warm Period.Geophysical Research Letters,47(4).
MLA	White S.M.,et al."Dampened El Niño in the Early Pliocene Warm Period".Geophysical Research Letters 47.4(2020).