首页|乌鲁木齐河源1号冰川冰芯剖面物理特征及其形成机理研究

乌鲁木齐河源1号冰川冰芯剖面物理特征及其形成机理研究

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冰芯中的化学成分,记录了古环境和古气候的诸多信息,已有广泛研究.而冰芯剖面的物理特征,由冰芯形成时的水热条件和冰川运动变质作用所决定,同样记录了气候、环境和冰川运动的诸多信息.根据在乌鲁木齐河源1号冰川钻取的6根冰芯的详尽资料,结合冰流模式对冰芯冰龄的估算,分析研究了不同冰川带冰芯剖面的物理特征、形成机理和相应的水热条件.结果表明:积累区冰芯以粒雪一冰交替的原生沉积层为主,受冰川流动引起的动力变质作用影响较小,与该区成冰环境和冰川温度密切相关;平衡线附近的冰芯4.3 m以上主要是由渗浸冻结冰组成的原生沉积层,与附近的成冰环境相吻合,以下部分主要是经过动力变质作用的冰体,源于冰川上部的积累物;消融区冰芯主要由冰川上部下流的冰川冰组成,模拟显示该区冰芯冰龄较长,受局部成冰环境的影响很小.通过对不同区域冰芯特征比较,发现各成冰带的冰芯组成及污化层差别较大;在东、西支冰川同时期冰芯剖面的对比中,发现海拔相近点冰芯剖面组构相近,说明通过冰芯资料来探讨冰川内部特征以及该区域气候环境演变历史等较具代表性.
Physical Characteristics and Formation Mechanisms of the Ice Cores Abstracted from the Glacier No. 1 at (U)rümqi River Head
Ice core chemistry records contain climatic and environmental information over a wide range of timescales. However, physical characteristics of ice cores, which are depended on water-temperature condition and glacier transformation during the ice formation, also contain climate, circumstance and glacier movement information. But less study on the physical characteristics and formation mechanisms of ice cores has been done at home owing to the research condition limitation. In this paper, physical characteristics of ice cores in difference glacier zones, formation mechanisms and heat-moisture conditions are analyzed for the six particular ice cores drilled from the Glacier No. 1 at ür ümqi River Head. It is suggested that the ice core in accumulation area is characterized by the alternation of coarse-grained firn and ice with origi- nal depositional features, the impact of the glacier flow on ice core is little. The ice core around the e-quilibrium line is composed of infiltration-congelation ice in the top 4. 3 m. The ice core in ablation area is composed of the ice which flow from the up part of the glacier. The flow mold indicates that the age of ice core in this area is old, which is impacted little by the environment of snow to ice transformation. Comparison of the ice cores in dif-ferent areas shows that the compositions of those ice cores have a large difference. The ice cores located in the east branch and west branch show the similar characteristics in the same times, which means that the physical characteristics of ice cores can be applied to study the climatic and environmental evolution.

Glacier No. 1ice core profilephysical characteristicstransformation from snow to iceice flow model

王林、李忠勤、王飞腾、李慧林、张明军

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中国科学院寒区旱区环境与工程研究所冰冻罔科学国家重点实验室/天山冰川观测试验站,甘肃兰州730000

西北师范大学地理与环境科学学院,甘肃兰州730070

1号冰川 冰芯剖面 物理特征 成冰过程 冰流模式

国家重点基础研究发展规划(973计划)中国科学院知识创新工程重要方向性项目国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金

2007CB411501KZCX-YW-1274063100140571033407010344070103540121101J0630966

2009

冰川冻土
中国地理学会 中国科学院寒区旱区环境与工程研究所

冰川冻土

CSTPCDCSCD北大核心
影响因子：2.546
ISSN：1000-0240
年,卷(期)：2009.31(1)
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