|本期目录/Table of Contents|

[1]周建超,吴敬禄,曾海鳌.新疆喀纳斯湖沉积物粒度组分所揭示的环境特征[J].地球科学与环境学报,2016,38(06):859-868.
　ZHOU Jian-chao,WU Jing-lu,ZENG Hai-ao.Environmental Characteristics Inferred from Sediment Sensitive Grain-size Component Records in Kanas Lake of Xinjiang[J].Journal of Earth Sciences and Environment,2016,38(06):859-868.
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第38卷
期数:
2016年第06期
页码:
859-868
栏目:
水资源与环境
出版日期:
2016-11-15

文章信息/Info

Title:
Environmental Characteristics Inferred from Sediment Sensitive Grain-size Component Records in Kanas Lake of Xinjiang
文章编号:
1672-6561(2016)06-0859-10
作者:
周建超; 吴敬禄; 曾海鳌
1.中国科学院南京地理与湖泊研究所 湖泊与环境国家重点实验室,江苏 南京 210008;2.中国科学院大学,北京 100049
Author(s):
ZHOU Jian-chao;  WU Jing-lu;  ZENG Hai-ao
1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, Jiangsu, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
关键词:
环境演化; 沉积物; 粒度; 敏感组分; 环境意义; 洪水事件; 喀纳斯湖; 新疆
Keywords:
environmental evolution;  sediment;  grain-size;  sensitive component;  environmental significance;  flood event;  Kanas Lake;  Xinjiang
分类号:
P512.2
DOI:
-
文献标志码:
A
摘要:
通过对新疆喀纳斯湖沉积物进行粒度分析,结合放射性同位素210Pb、137Cs定年,研究了喀纳斯湖沉积物粒度敏感组分特征及其环境意义。喀纳斯湖沉积物以细颗粒组分(粒径小于16 μm)为主,但1814~1830年(32~35 cm深度处)和1893~1903 年(18~20 cm深度处)这两个时期的沉积物粒度特征发生了突变,粗颗粒组分(粒径大于16 μm)尤其是粒径大于63 μm组分含量迅速升高。对沉积物粒度频率曲线的分析表明, 这两个时期的沉积物来源或沉积动力过程发生了显著变化。基于此,首先运用粒径-标准偏差法提取了沉积物中的敏感粒度组分C2(粒径为15~238 μm),进而通过敏感粒度组分与器测气象数据的相关性分析和沉积物粗粒径(C)-中值粒径(M)图分析,研究了喀纳斯湖沉积物沉积时的动力条件。组分C2的含量大小与区域春季、夏季温度有关,反映了山地春季和夏季雪、冰融水入湖的强度,组分C2含量在1814~1830年和1893~1903年这两个时期的快速增大与水动力异常偏大有关,据此识别了两次显著的洪水事件。与区域树轮、冰芯记录及文献记载的对比分析表明,洪水事件的发生与对应时期内暖湿的气候特征有关。
Abstract:
Based on the analysis of a sediment core from Kanas Lake of Xinjiang, compared with the dating of radioactive 210Pb and 137Cs isotopes, the characteristics and environmental significance of sensitive grain-size components of sediments in Kanas Lake were studied. The sediments mainly consist of fine particle components (grain size is less than 16 μm); however, during 1814-1830 AD (the depth of 32-35 cm) and 1893-1903 AD (the depth of 32-35 cm), the grainsize displays a sudden shift, which is the significant increase of the coarse particle components (grain size is more than 16 μm, especially more than 63 μm). The analysis of grain-size frequency curves of sediments indicates that the sediment provenances or dynamic processes have changed significantly during 1814-1830 AD and 1893-1903 AD. And then, the sensitive grainsize component C2 (grain size is 15-238 μm) of sediment is extracted by the method of grain sizestandard deviation. Based on the correlation analysis of sensitive grain-size component and meteorological data measured by apparatus, the dynamic conditions of sediments in Kanas Lake were studied with the C-M diagram analysis of sediments. The content of sensitive grain-size component C2 is related to the regional spring and summer average temperature, and reflect the intensity of the meltwater from spring, summer snow and ice into the lake in mountainous; the significant increases of content of component C2 during 1814-1830 AD and 1893-1903 AD are related to the unusual increase of hydrodynamic force, thus two significant flood events are identified. Compared with the historical literatures and the records of tree ring and ice core, the flood events are related to warmer and wetter climate conditions during 1814-1830 and 1893-1903.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2016-05-16
基金项目:国家自然科学基金项目(41271205,U1138301,41471173)
作者简介:周建超(1989-),男,河南信阳人,中国科学院大学理学博士研究生,E-mail:xidazhouyangyang@163.com。
通讯作者:吴敬禄(1965-),男,浙江义乌人,研究员,博士研究生导师,理学博士,E-mail:w.jinglu@niglas.ac.cn。
更新日期/Last Update: 2016-12-01