Environmental Characteristics Inferred from Sediment Sensitive Grain-size Component Records in Kanas Lake of Xinjiang(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2016年第06期
- Page:
- 859-868
- Research Field:
- 水资源与环境
- Publishing date:
Info
- Title:
- Environmental Characteristics Inferred from Sediment Sensitive Grain-size Component Records in Kanas Lake of Xinjiang
- 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
- Keywords:
- environmental evolution; sediment; grain-size; sensitive component; environmental significance; flood event; Kanas Lake; Xinjiang
- PACS:
- P512.2
- DOI:
- -
- 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 grainsize 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 grainsize component C2 (grain size is 15-238 μm) of sediment is extracted by the method of grain sizestandard 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.
Last Update: 2016-12-01