干旱区生态环境知识资源中心(Arid): Chloride tracer of the loess unsaturated zone under sub-humid region: A potential proxy recording high-resolution hydroclimate

Arid

DOI	10.1016/j.scitotenv.2019.134465
	Chloride tracer of the loess unsaturated zone under sub-humid region: A potential proxy recording high-resolution hydroclimate
	Lu, Yanwei 1; Li, Huijie 1; Si, Bingcheng 1,2; Li, Min 1
通讯作者	Li, Min
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2020
卷号	700
英文摘要	A high-resolution hydroclimate archive is critical to understanding the past changes, but such hydroclimatic reconstructions are extremely limited. Our study aims to examine the potential of the chloride tracer (Cl) within unsaturated zone (USZ) to reconstruct high-resolution hydroclimate records. We investigated a representative sub-humid monsoon area of the Chinese Loess highland, where piston flow recharge dominates and a constant rate of Cl input occurs. We successfully reconstructed a 1007-yr hydroclimate record with a 2-yr sampling resolution using a 95-m USZ Cl profile. Excluding the recycling and mixing zone, and the groundwater affecting zone, six relatively humid phases and five relatively dry phases were discernible. The uncertainty in the time of wet/dry phase decreases as the accumulated time increases, and the minimal recharge uncertainty is 16% over a 10-yr time scale. The reconstructed hydroclimate record from the semi-humid region has a much higher resolution than that of the arid zones, likely because the semi-humid, fine-grained thick USZ, possesses higher velocity piston flow, relatively to diffusion and dispersion of Cl signals. The record compared well with other related records, suggesting that the Cl proxy can be used in sub-humid areas, and is sensitive to wet/dry alternations that are largely driven by the Asian monsoon intensity. To the best of our knowledge, this is the first investigation of the USZ Cl to hydroclimatic reconstruction in a non-arid region. The high-resolution hydroclimate record may deepen our understanding of the hydrological process in the deep USZ, past climate and water resources, and promote developments of the hydropedology and global change science. (C) 2019 Elsevier B.V. All rights reserved.
英文关键词	The unsaturated zone Chloride tracer Soil water movement Hydroclimatic reconstruction Sub-humid areas
类型	Article
语种	英语
国家	Peoples R China ; Canada
收录类别	SCI-E
WOS记录号	WOS:000499480800011
WOS关键词	GROUNDWATER RECHARGE ; APPLE-TREES ; MAGNETIC-SUSCEPTIBILITY ; SOIL-PROFILE ; LAND-USE ; WATER ; PLATEAU ; PALEOCLIMATE ; EVOLUTION ; CLIMATE
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
EI主题词	2020-01-15
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312480
作者单位	1.Northwest A&F Univ, Key Lab Agr Soil & Water Engn Arid & Semiarid Are, Minist Educ, Yangling 712100, Shaanxi, Peoples R China; 2.Univ Saskatchewan, Dept Soil Sci, Saskatoon, SK S7N 5A8, Canada
推荐引用方式 GB/T 7714	Lu, Yanwei,Li, Huijie,Si, Bingcheng,et al. Chloride tracer of the loess unsaturated zone under sub-humid region: A potential proxy recording high-resolution hydroclimate[J]. 西北农林科技大学,2020,700.
APA	Lu, Yanwei,Li, Huijie,Si, Bingcheng,&Li, Min.(2020).Chloride tracer of the loess unsaturated zone under sub-humid region: A potential proxy recording high-resolution hydroclimate.SCIENCE OF THE TOTAL ENVIRONMENT,700.
MLA	Lu, Yanwei,et al."Chloride tracer of the loess unsaturated zone under sub-humid region: A potential proxy recording high-resolution hydroclimate".SCIENCE OF THE TOTAL ENVIRONMENT 700(2020).