气候变化领域集成服务门户(CCPortal): Enhanced North American ENSO Teleconnections During the Little Ice Age Revealed by Paleoclimate Data Assimilation

CCPortal

DOI	10.1029/2020GL087504
	Enhanced North American ENSO Teleconnections During the Little Ice Age Revealed by Paleoclimate Data Assimilation
	Dee S.; Okumura Y.; Stevenson S.; Di Nezio P.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:15
英文摘要	Teleconnection rainfall over North America may be systematically altered by tropical Pacific mean state changes. Characterizing teleconnection changes to improve prediction requires many realizations of ENSO events, but twentieth century data are temporally limited. To extend twentieth century records, we evaluate ENSO events in a new last-millennium paleoclimate data assimilation reconstruction to deduce how mean state changes affect the magnitude/extent of ENSO-driven rainfall in the United States. Despite global cooling during the Little Ice Age, the central-eastern tropical Pacific warms relative to the Medieval Climate Anomaly, shifting teleconnections eastward and increasing rainfall anomalies in the southwestern United States. Teleconnections strengthen independently of ENSO amplitude; we thus suggest caution in using paleoclimate reconstructions of teleconnection rainfall as a proxy for ENSO amplitude. We demonstrate teleconnection rainfall is sensitive to the pattern of tropical Pacific mean SST changes, underscoring the importance of reducing uncertainties in future warming patterns in the tropical Pacific. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Glacial geology; Rain; Tropics; Data assimilation; Eastern tropical pacific; Last millenniums; Medieval climate anomalies; Paleoclimate reconstruction; Rainfall anomaly; Twentieth century; Warming patterns; Climatology; cooling; data assimilation; El Nino-Southern Oscillation; Little Ice Age; paleoclimate; rainfall; reconstruction; teleconnection; twentieth century; North America; Pacific Ocean; Pacific Ocean (Tropical); United States
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/169995
作者单位	Department of Earth, Environmental, and Planetary Sciences, William Marsh Rice University, Houston, TX, United States; Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States; Bren School of Environmental Sciences & Management, University of California, Santa Barbara, CA, United States
推荐引用方式 GB/T 7714	Dee S.,Okumura Y.,Stevenson S.,et al. Enhanced North American ENSO Teleconnections During the Little Ice Age Revealed by Paleoclimate Data Assimilation[J],2020,47(15).
APA	Dee S.,Okumura Y.,Stevenson S.,&Di Nezio P..(2020).Enhanced North American ENSO Teleconnections During the Little Ice Age Revealed by Paleoclimate Data Assimilation.Geophysical Research Letters,47(15).
MLA	Dee S.,et al."Enhanced North American ENSO Teleconnections During the Little Ice Age Revealed by Paleoclimate Data Assimilation".Geophysical Research Letters 47.15(2020).