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	Changes in chemical and isotopic properties near infiltrated cracks in an ice core from Urumqi glacier No. 1, Tien Shan, China
	Lee, XQ; Qin, DH; Hou, SG; Ren, JW; Duan, KQ; Zhou, H
发表日期	2002
ISSN	0260-3055
起始页码	162
结束页码	166
卷号	35
英文摘要	Ice cores recovered for paleoclimatic and/or paleoenvironmental reconstructions in the Tien Shan and Qinghai-Tibetan Plateau often encounter cracks. Although we expect that cracks opened to surface meltwater will inevitably change ice-core records, we do not know how and to what extent records are influenced. An ice core retrieved from glacier No. 1 at Urumqi river head, Tien Shan, China, exhibits a crack nearly 2.5 m long that has admitted meltwater, forming secondary ice within the fracture. A small inclusion of the infiltrated ice in sampling is shown to reduce delta(18)O by an extent of Holocene vs Last Glacial Maximum while enhancing significantly the pH, conductivity and the following ionic species: F-, Cl-, Br-, NO3-, SO42-, PO43-, HCOO-, CH3COO-, C(2)O(4)(2-)and CO(COO)(2)(2-). Of the parameters increased, C2O42- and HCOO- are the most affected, being enhanced nearly six-fold in the fractured section compared to the non-fractured sections, followed by SO42-, F-, NO3-, PO43-, pH, Br-, Cl-, CH3COO-, CO(COO)(2)(2) and electrical conductivity measurement (ECM). Despite the alteration, primary fluctuations of some parameters are still recognizable. This suggests that if the infiltrated ice can be avoided in the sampling operation, ice cores with cracks may still provide authentic records. This shows the need to pay close attention to physical characteristics of ice cores in order to identify such secondary ice.
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
来源期刊	ANNALS OF GLACIOLOGY, VOL 35
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158743
作者单位	Lee, XQ (corresponding author), Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Guizhou, Peoples R China.
推荐引用方式 GB/T 7714	Lee, XQ,Qin, DH,Hou, SG,et al. Changes in chemical and isotopic properties near infiltrated cracks in an ice core from Urumqi glacier No. 1, Tien Shan, China[J],2002,35.
APA	Lee, XQ,Qin, DH,Hou, SG,Ren, JW,Duan, KQ,&Zhou, H.(2002).Changes in chemical and isotopic properties near infiltrated cracks in an ice core from Urumqi glacier No. 1, Tien Shan, China.ANNALS OF GLACIOLOGY, VOL 35,35.
MLA	Lee, XQ,et al."Changes in chemical and isotopic properties near infiltrated cracks in an ice core from Urumqi glacier No. 1, Tien Shan, China".ANNALS OF GLACIOLOGY, VOL 35 35(2002).