干旱区生态环境知识资源中心(Arid): Great Basin Paleoclimate and Aridity Linked to Arctic Warming and Tropical Pacific Sea Surface Temperatures

Arid

DOI	10.1029/2019PA003785
	Great Basin Paleoclimate and Aridity Linked to Arctic Warming and Tropical Pacific Sea Surface Temperatures
	Lachniet, Matthew S.; Asmerom, Yemane; Polyak, Victor; Denniston, Rhawn
通讯作者	Lachniet, MS
来源期刊	PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
ISSN	2572-4517
EISSN	2572-4525
出版年	2020
卷号	35 期号:7
英文摘要	The arid southwestern United States is susceptible to sustained droughts that impact water resources and economic activity for millions of residents. Previous work has not systematically investigated the structure, timing, and possible forcings of Holocene Great Basin sub-orbital hydroclimate changes, impeding our ability to understand the potential future controls on Southwestern aridity. The objective of this paper is to constrain the potential forcings on Holocene aridity and temperature, via comparison of new high-resolution speleothem data, an Aridity Index synthesizing hydroclimate records, and linkages of Southwestern paleoclimate to other regions. The high-resolution data from Leviathan Cave provide a paleoclimate record since 13,400 yr ago: A cool Younger Dryas was followed by two pronounced Middle Holocene aridity intervals between 9,850 and 5,310 yr B2k characterized by low growth rates and high delta O-18 and delta C-13 values. Subsequently, stalagmite delta O-18 values show near-modern levels for the last four millennia during which time growth rates were high and delta C-13 values were low in response to wetter conditions. The regional Aridity Index documents that Middle Holocene drying coincided with a warm Arctic and decreased sea ice extent, a warm western tropical Pacific, and a large sea surface temperature gradient across the tropical Pacific, all of which likely responded to northern hemisphere summer insolation forcing. Our data suggest that extreme Middle Holocene aridity is more severe than the short medieval droughts evident in the tree ring record, and such extreme aridity may represent a worst-case analog for future climate.
英文关键词	Great Basin paleoclimate aridity Arctic Pacific Ocean Colorado River Basin Southwestern United States
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000556646600013
WOS关键词	NORTHERN HIGH-LATITUDES ; LATE-HOLOCENE ; MOJAVE DESERT ; ICE VARIATIONS ; CLIMATE-CHANGE ; UNITED-STATES ; ATMOSPHERIC RIVERS ; VEGETATION HISTORY ; EL-NINO ; OCEAN
WOS类目	Geosciences, Multidisciplinary ; Oceanography ; Paleontology
WOS研究方向	Geology ; Oceanography ; Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325468
作者单位	[Lachniet, Matthew S.] Univ Nevada, Dept Geosci, Las Vegas, NV 89154 USA; [Asmerom, Yemane; Polyak, Victor] Univ New Mexico, Dept Earth & Planetary Sci, Albuquerque, NM 87131 USA; [Denniston, Rhawn] Cornell Coll, Dept Geol, Mt Vernon, IA 52314 USA
推荐引用方式 GB/T 7714	Lachniet, Matthew S.,Asmerom, Yemane,Polyak, Victor,et al. Great Basin Paleoclimate and Aridity Linked to Arctic Warming and Tropical Pacific Sea Surface Temperatures[J],2020,35(7).
APA	Lachniet, Matthew S.,Asmerom, Yemane,Polyak, Victor,&Denniston, Rhawn.(2020).Great Basin Paleoclimate and Aridity Linked to Arctic Warming and Tropical Pacific Sea Surface Temperatures.PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,35(7).
MLA	Lachniet, Matthew S.,et al."Great Basin Paleoclimate and Aridity Linked to Arctic Warming and Tropical Pacific Sea Surface Temperatures".PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY 35.7(2020).