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	Climatological significance of delta O-18 in precipitation and ice cores: a case study at the head of the Urumqi river, Tien Shan, China
	Hou, SG; Qin, DH; Mayewski, PA; Yang, QZ; Ren, JW; Li, ZQ; Xiao, CD
发表日期	1999
ISSN	0022-1430
起始页码	517
结束页码	523
卷号	45 期号:151
英文摘要	Stable-oxygen-isotope ratios (delta(18)O) of precipitation and ice-core samples collected from the headwaters of the Urumqi river, Tien Shan, China, were used to test the relationship between delta(18)O and contemporaneous surface air temperature (T-a). A strong temporal relationship is found between delta(18)O in precipitation and T-a, particularly for the monthly averages which remove synoptic-scale influences such as changes in condensation level, condensation temperature and moisture sources (Yao and others, 1996). Linear fits as high as 0.95 parts per thousand degrees C-1 for precipitation events and 1.23 parts per thousand degrees C-1 for monthly averages are found. Although the delta(18)O amplitude in ice cores drilled at the nearby Urumqi glacier No. 1 (similar to 2 km from the precipitation sampling site) decreased dramatically compared to the precipitation samples, the ice-core records of annually averaged delta(18)O are still positively correlated with contemporaneous air temperature, especially summer air temperature, at the nearby Daxigou meteorological station. Nevertheless, the relationship between the ice-core records and contemporaneous air temperature is less significant than that for the precipitation samples due to depositional and post-depositional modification processes, which are highlighted by the successive snow-pit delta(18)O profiles from the Urumqi glacier No.1. Our results might extend the application of high-altitude and subtropical ice-core delta(18)O-T-a records for paleoclimate reconstruction.
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
来源期刊	JOURNAL OF GLACIOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158774
作者单位	Hou, SG (corresponding author), Chinese Acad Sci, Lanzhou Inst Glaciol & Geocryol, Lab Ice Core & Cold Reg Environm, Lanzhou 730000, Gansu, Peoples R China.
推荐引用方式 GB/T 7714	Hou, SG,Qin, DH,Mayewski, PA,et al. Climatological significance of delta O-18 in precipitation and ice cores: a case study at the head of the Urumqi river, Tien Shan, China[J],1999,45(151).
APA	Hou, SG.,Qin, DH.,Mayewski, PA.,Yang, QZ.,Ren, JW.,...&Xiao, CD.(1999).Climatological significance of delta O-18 in precipitation and ice cores: a case study at the head of the Urumqi river, Tien Shan, China.JOURNAL OF GLACIOLOGY,45(151).
MLA	Hou, SG,et al."Climatological significance of delta O-18 in precipitation and ice cores: a case study at the head of the Urumqi river, Tien Shan, China".JOURNAL OF GLACIOLOGY 45.151(1999).