干旱区生态环境知识资源中心(Arid): 天山乌鲁木齐河源1号冰川冰芯记录形成过程及年代划分

Arid

	天山乌鲁木齐河源1号冰川冰芯记录形成过程及年代划分
其他题名	Chronology and record formation process of an ice core from Glacier No.1 at the Urumqi Riverhead in eastern Tianshan,China
	王立伟; 李忠勤; 董志文; 王飞腾
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2011
卷号	34 期号:5 页码:739-745
中文摘要	冰川冰芯记录了历史时期的气候环境信息。天山乌鲁木齐河源l号冰川位于亚洲大陆干旱半干旱地区的腹地，1991- 1998年在1号冰川钻取的4根深冰芯(T_0～T_3)，用于探究该地区历史时期各项气候环境信息记录。通过化学离子季节变化特征以及8180和Mg2+的剖面与树轮重建的温度记录对比，分别对冰芯T_2 (80.1 m)的32 m以上和底部一段(33～77.25 m)定年，确定了整个冰芯年代与深度之间的关系，并建立了采样点雪冰中污化层所代表的年代和深度之间的关系方程式。结果表明:T_2这根冰芯大约有658 a的时间；小冰期冰碛的年龄与冰芯中记录的冷湿时期相一致。在定年的过程中，冰芯形成过程的探讨提供了理论依据。
英文摘要	Glaciers ice core records the environmental information of the history.A suite of ice cores (T_0 - T_3)were recovered from 1991 to 1998 at Glacier No.1 at the Urumqi Riverhead in eastern Tianshan,China,which are in the arid and semi - arid region in Central Asia,to explore the environmental information in the historical period in this area.As basic knowledge for the ice core dating,annual net accumulation (28.4 cm ieq)was determined by identifying overlaps in chemical profiles of two ice cores drilled in different year,which is higher than on site mass balance budget,suggesting a potion of ice mass came from higher reaches of the glacier through ice flow.The study of formation process of light stable isotopic ratio and dust layer in the ice core during the past several years made a great contribution to the ice core dating.Annual net accumulation at drilling site is a very useful reference parameter in ice core dating.The annual net accumulation of surface snow at drilling site can be obtained from specific mass balance measurement at this site or through ice formation process observation.In order to resolve the uncertainties in the ice core dating and better interpret the records,a research program was conducted during the past several years under PGPI,which specifically focused on the effects of meltwater involved post - depositional processes on chemical species in snow - firn pack and the formation process of ice core records.This study has resulted in a number of outcomes with respect to the formation processes of various records in ice core and the effects of post depositional process on the snow -firn chemistry,etc.,which,particularly the results of evolution processes of dust layer and delta18O,has been proven to be very useful for the ice core dating and the records interpretation.Retrieved in October 1991 ,the 91.64 m T0 was the only core reached to bedrock.Both T_1 and T_2 were recovered in May 1996.with the lengths of 6.09 m and 80.1 m respectively.T3 was 14.08 m long and extracted in October 1998.All of the ice cores retrieved from a relatively flat site in percolation zone of Glacier No.1 with elevations of 4 050 m for T_0,T_1 and T_2 ,4 040 m for T_3.This paper presents chronology establishment process of T_2 (80.1 m).Cross counting of seasonal variations in chemical species profiles was employed for dating the top 32 m section.By comparing delta~(18)O and Mg2 + profiles to temperature record reconstructed from tree rings,obtained were dating results in lower part of the core (33 - 77.25 m),which presents the age - depth relationship for the entire core,meanwhile,vertical formation velocity of visible dust horizons at drilling site leads to another age - depth equation.The result indicates that T_2 contained 658 years.In addition,the ages of LIA moraines are coincident with cold or wet eras in the ice core records.And the study on the formation process of the ice core records provides with a theoretic base for the ice core dating.
中文关键词	乌鲁木齐河源1号冰川 ; 冰芯 ; 定年 ; 形成过程
英文关键词	Glacier No.1 ice core the chronology formation process
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Geology
WOS研究方向	Geology
CSCD记录号	CSCD:4327923
来源机构	中国科学院西北生态环境资源研究院 ; 西北师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/226477
作者单位	王立伟, 西北师范大学地理与环境科学学院, 兰州, 甘肃 730070, 中国.; 李忠勤, 西北师范大学地理与环境科学学院, 冰冻圈科学国家重点实验室／天山冰川站, 兰州, 甘肃 730070, 中国.; 董志文, 中国科学院寒区旱区环境与工程研究所, 冰冻圈科学国家重点实验室／天山冰川站, 兰州, 甘肃 730000, 中国.; 王飞腾, 中国科学院寒区旱区环境与工程研究所, 冰冻圈科学国家重点实验室／天山冰川站, 兰州, 甘肃 730000, 中国.
推荐引用方式 GB/T 7714	王立伟,李忠勤,董志文,等. 天山乌鲁木齐河源1号冰川冰芯记录形成过程及年代划分[J]. 中国科学院西北生态环境资源研究院, 西北师范大学,2011,34(5):739-745.
APA	王立伟,李忠勤,董志文,&王飞腾.(2011).天山乌鲁木齐河源1号冰川冰芯记录形成过程及年代划分.干旱区地理,34(5),739-745.
MLA	王立伟,et al."天山乌鲁木齐河源1号冰川冰芯记录形成过程及年代划分".干旱区地理 34.5(2011):739-745.