气候变化领域集成服务门户(CCPortal): Climate model teleconnection patterns govern the niño-3.4 response to early nineteenth-century volcanism in coral-based data assimilation reconstructions

CCPortal

DOI	10.1175/JCLI-D-20-0549.1
	Climate model teleconnection patterns govern the niño-3.4 response to early nineteenth-century volcanism in coral-based data assimilation reconstructions
	Sanchez S.C.; Hakim G.J.; Saenger C.P.
发表日期	2021
ISSN	08948755
起始页码	1863
结束页码	1880
卷号	34 期号:5
英文摘要	Scientific understanding of low-frequency tropical Pacific variability, especially responses to perturbations in radiative forcing, suffers from short observational records, sparse proxy networks, and bias in model simulations. Here, we combine the strengths of proxies and models through coral-based paleoclimate data assimilation. We combine coral archives (d18O, Sr/Ca) with the dynamics, spatial teleconnections, and intervariable relationships of the CMIP5/PMIP3 Past1000 experiments using the Last Millennium Reanalysis data assimilation framework. This analysis creates skillful reconstructions of tropical Pacific temperatures over the observational era. However, during the period of intense volcanism in the early nineteenth century, southwestern Pacific corals produce El Niño-Southern Oscillation (ENSO) reconstructions that are of opposite sign from those from eastern Pacific corals and tree ring records. We systematically evaluate the source of this discrepancy using 1) single-proxy experiments, 2) varied proxy system models (PSMs), and 3) diverse covariance patterns from the Past1000 simulations. We find that individual proxy records and coral PSMs do not significantly contribute to the discrepancy. However, following major eruptions, the southwestern Pacific corals locally record more persistent cold anomalies than found in the Past1000 experiments and canonical ENSO teleconnections to the southwest Pacific strongly control the reconstruction response. Furthermore, using covariance patterns independent of ENSO yields reconstructions consistent with coral archives across the Pacific. These results show that model bias can strongly affect how proxy information is processed in paleoclimate data assimilation. As we illustrate here, model bias influences the magnitude and persistence of the response of the tropical Pacific to volcanic eruptions. © 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	ENSO; Paleoclimate
语种	英语
scopus关键词	Atmospheric pressure; Atmospheric radiation; Climatology; Forestry; Tropics; Volcanoes; Data assimilation; Last millenniums; Model simulation; Radiative forcings; Southern oscillation; Teleconnection patterns; Tree ring records; Volcanic eruptions; Climate models; climate modeling; coral; data assimilation; El Nino-Southern Oscillation; nineteenth century; paleoclimate; reconstruction; teleconnection; volcanic eruption; volcanism; Pacific Ocean; Pacific Ocean (Tropical); Anthozoa
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178694
作者单位	Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA, United States; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Sanchez S.C.,Hakim G.J.,Saenger C.P.. Climate model teleconnection patterns govern the niño-3.4 response to early nineteenth-century volcanism in coral-based data assimilation reconstructions[J],2021,34(5).
APA	Sanchez S.C.,Hakim G.J.,&Saenger C.P..(2021).Climate model teleconnection patterns govern the niño-3.4 response to early nineteenth-century volcanism in coral-based data assimilation reconstructions.Journal of Climate,34(5).
MLA	Sanchez S.C.,et al."Climate model teleconnection patterns govern the niño-3.4 response to early nineteenth-century volcanism in coral-based data assimilation reconstructions".Journal of Climate 34.5(2021).