气候变化领域集成服务门户(CCPortal): A low-frequency summer temperature reconstruction for the United States Southwest, 3000 BC-AD 2000

CCPortal

DOI	10.1177/09596836231219482
	A low-frequency summer temperature reconstruction for the United States Southwest, 3000 BC-AD 2000
	Gillreath-Brown, Andrew; Bocinsky, R. Kyle; Kohler, Timothy A.
发表日期	2024
ISSN	0959-6836
EISSN	1477-0911
起始页码	34
结束页码	4
卷号	34 期号:4
英文摘要	Temperature variability likely played an important role in determining the spread and productive potential of North America's key prehispanic agricultural staple, maize. The United States Southwest (SWUS) also served as the gateway for maize to reach portions of North America to the north and east. Existing temperature reconstructions for the SWUS are typically low in spatial or temporal resolution, shallow in time depth, or subject to unknown degrees of insensitivity to low-frequency variability, hindering accurate determination of temperature's role in agricultural productivity and variability in distribution and success of prehispanic farmers. Here, we develop a model-based modern analog technique (MAT) approach applied to 29 SWUS fossil pollen sites to reconstruct July temperatures from 3000 BC to AD 2000. Temperatures were generally warmer than or similar to those of the modern (1961-1990) period until the first century AD. Our reconstruction also notes rapid warming beginning in the AD 1800s; modern conditions are unprecedented in at least the last five millennia in the SWUS. Temperature minima were reached around 1800 BC, 1000 BC, AD 400 (the global minimum in this series), the mid-to-late AD 900s, and the AD 1500s. Summer temperatures were generally depressed relative to northern hemisphere norms by a dominance of El Nino-like conditions during much of the second millenium BC and the first millenium AD, but somewhat elevated relative to those same norms in other periods, including from about AD 1300 to the present, due to the dominance of La Nina-like conditions.
英文关键词	ENSO; late-Holocene; modern analog technique; pollen; summer temperatures; US Southwest
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:001137173200001
来源期刊	HOLOCENE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/300381
作者单位	Washington State University; University of California System; University of California San Diego; Scripps Institution of Oceanography; University of Montana System; University of Montana; The Santa Fe Institute
推荐引用方式 GB/T 7714	Gillreath-Brown, Andrew,Bocinsky, R. Kyle,Kohler, Timothy A.. A low-frequency summer temperature reconstruction for the United States Southwest, 3000 BC-AD 2000[J],2024,34(4).
APA	Gillreath-Brown, Andrew,Bocinsky, R. Kyle,&Kohler, Timothy A..(2024).A low-frequency summer temperature reconstruction for the United States Southwest, 3000 BC-AD 2000.HOLOCENE,34(4).
MLA	Gillreath-Brown, Andrew,et al."A low-frequency summer temperature reconstruction for the United States Southwest, 3000 BC-AD 2000".HOLOCENE 34.4(2024).