气候变化领域集成服务门户(CCPortal): Holocene Moisture Variations in Western Arid Central Asia Inferred From Loess Records From NE Iran

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DOI	10.1029/2019GC008616
	Holocene Moisture Variations in Western Arid Central Asia Inferred From Loess Records From NE Iran
	Wang, Qiang; Wei, Haitao; Khormali, Farhad; Wang, Leibin; Yan, Huaiyu; Xie, Haichao; Wang, Xin; Huang, Wei; Chen, Jianhui; Chen, Fahu
通讯作者	Wei, HT ; Chen, JH (通讯作者)
发表日期	2020
EISSN	1525-2027
卷号	21 期号:3
英文摘要	Holocene variations in precipitation in central and eastern arid central Asia (ACA) have been widely investigated, but the pattern in western ACA remains unclear. We present records of the stable carbon isotope composition of bulk organic matter (delta C-13(org)), magnetic parameters, and sediment color, from five loess-paleosol sequences in NE Iran, in western ACA, with the aim of reconstructing Holocene precipitation. The Yellibadragh (YE) section (the thickest among the five sequences) was selected for optically stimulated luminescence (OSL) dating of the coarse-grained quartz (63-90 mu m) fraction, and its delta C-13(org) record was used to quantitatively reconstruct mean annual precipitation (MAP). The record indicates a dry early Holocene (similar to 11.8-7.4 ka), with nearly constant MAP (similar to 93 mm), followed by a wetting trend from the mid-Holocene (similar to 7.4 ka) onward, with the wettest period in the late Holocene (similar to 4.0-0.0 ka, similar to 390 mm). The stratigraphic observations and environmental proxies support the reconstruction. The other loess profiles show stratigraphic features and trends of environmental proxies, which are similar to those of the YE profile. A dry early Holocene and wetting trend since the mid-Holocene, with the wettest climate in the late Holocene in NE Iran, are both consistent with records from sand dunes and lake sediments from adjacent areas, and with loess records from central and eastern ACA. Comparison with loess records from monsoonal Asia supports the interpretation of a westerly-dominated climatic regime, which was proposed mainly on the basis of lake sediment records from the region. Changes in solar insolation may have been responsible for the persistent wetting trend during the Holocene in western ACA.
关键词	CARBON ISOTOPIC COMPOSITION WINTER-SPRING PRECIPITATION OF-PHASE RELATIONSHIP WATER-USE EFFICIENCY ORGANIC-MATTER LATE PLEISTOCENE PALEOSOL SEQUENCE TIANSHAN MOUNTAINS NORTHERN XINJIANG CLIMATE-CHANGE
英文关键词	Iranian loess-paleosol sequence; Holocene; moisture; precipitation trend; western ACA
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000534469900012
来源期刊	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259843
推荐引用方式 GB/T 7714	Wang, Qiang,Wei, Haitao,Khormali, Farhad,et al. Holocene Moisture Variations in Western Arid Central Asia Inferred From Loess Records From NE Iran[J]. 中国科学院青藏高原研究所,2020,21(3).
APA	Wang, Qiang.,Wei, Haitao.,Khormali, Farhad.,Wang, Leibin.,Yan, Huaiyu.,...&Chen, Fahu.(2020).Holocene Moisture Variations in Western Arid Central Asia Inferred From Loess Records From NE Iran.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,21(3).
MLA	Wang, Qiang,et al."Holocene Moisture Variations in Western Arid Central Asia Inferred From Loess Records From NE Iran".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 21.3(2020).