气候变化领域集成服务门户(CCPortal): Is there a low-frequency bias in multiproxy reconstructions of tropical pacific SST variability?

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DOI	10.1016/j.quascirev.2020.106530
	Is there a low-frequency bias in multiproxy reconstructions of tropical pacific SST variability?
	Loope G.; Thompson D.; Cole J.; Overpeck J.
发表日期	2020
ISSN	0277-3791
卷号	246
英文摘要	Decadal and longer-term variability in the tropical Pacific has the potential to impact climate worldwide, yet paleoclimate observations and climate model simulations disagree on the nature of this variability. In this study we investigate whether biases from paleoclimate reconstruction methodology and the currently available proxy network cause reconstructions of ENSO to overestimate the multidecadal-century scale variability of the Pacific. We build new reconstructions using a variety of commonly employed methods and test the effects of four types of bias on analogous pseudoproxy reconstructions. These biases include (1) the number of records used in the reconstruction, (2) chronological uncertainty, (3) noise in individual proxy records, and (4) the geographical distribution of the proxy network. We find that each of these biases cause ENSO reconstructions to overestimate the importance of low-frequency variability. These biases may partially explain why multiproxy reconstructions of Pacific variability have stronger low-frequency variability than predicted by historical observations or climate models, and why these reconstructions do not have coherent signals over the multidecadal-century scale. © 2020 Elsevier Ltd
英文关键词	Common era; Coral; ENSO; iCESM; Isotope-enabled climate model; Paleoceanography; paleoclimatology; Proxy systemx model; Pseudoproxy; Tree-rings
语种	英语
scopus关键词	Climatology; Geographical distribution; Tropics; Climate model simulations; Coherent signals; Historical observation; Low frequency variability; Low-frequency; Paleoclimate reconstruction; Paleoclimates; Proxy-networks; Climate models; climate modeling; decadal variation; El Nino-Southern Oscillation; geochronology; geographical distribution; paleoclimate; reconstruction; sea surface temperature; signal-to-noise ratio; Pacific Ocean; Pacific Ocean (Tropical); Anthozoa
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151321
作者单位	Department of Geosciences, University of Arizona, 1040 E 4th Street, Tucson, AZ 85721, United States; Department of Earth and Environmental Sciences, University of Michigan, 1100 N. University Ave., Ann Arbor, MI 48109, United States; School for Environment and Sustainability, University of Michigan, 440 Church Street, Ann Arbor, MI 48109, United States
推荐引用方式 GB/T 7714	Loope G.,Thompson D.,Cole J.,et al. Is there a low-frequency bias in multiproxy reconstructions of tropical pacific SST variability?[J],2020,246.
APA	Loope G.,Thompson D.,Cole J.,&Overpeck J..(2020).Is there a low-frequency bias in multiproxy reconstructions of tropical pacific SST variability?.Quaternary Science Reviews,246.
MLA	Loope G.,et al."Is there a low-frequency bias in multiproxy reconstructions of tropical pacific SST variability?".Quaternary Science Reviews 246(2020).