柴达木盆地苏干湖沉积元素特征与大风尘暴事件

宋磊; 强明瑞; 牛光明; 郎丽丽

doi:10.3724/SP.J.1140.2009.01095

柴达木盆地苏干湖沉积元素特征与大风尘暴事件

doi: 10.3724/SP.J.1140.2009.01095

详细信息

兰州大学西部环境教育部重点实验室, 兰州 730000

作者简介:
宋磊(1983-),男,硕士生,环境演变与全球变化专业,E-mail:songl06@lzu.cn

基金项目:
教育部博士点基金(20060730003)

国家自然科学基金项目(40671192和40721061)
中图分类号: P539.6

ELEMENTAL CHARACTERISTICS OF SEDIMENTS FROM LAKE SUGAN IN QAIDAM BASIN AND THE STRONG WIND (DUST STORM) EVENTS

More Information

Center for Arid Environment and Paleoclimate Research, Key Laboratory of Western China's Environmental Systems, Ministry of Education, Lanzhou University, lanzhou 730000, China

摘要: 通过分析苏干湖地区降尘(含尘暴样品)、湖泊表层沉积(碎屑沉积)以及湖泊东部地表沉积3组样品的元素组成特征发现:3组样品具有同源性,Al和Ti在粉尘释放-沉积中行为稳定,Fe可能受元素分馏效应的影响,在湖泊沉积中富集程度相对较高。6次典型尘暴特征分析结果表明,尘暴降尘中Al、Fe、Ti通量的变化与尘暴发生期间10 min平均风速及其变差系数(Cv)间存在显著的相关关系。Al、Fe、Ti通量不仅可以作为尘暴中风速变化的替代指标,而且可以指示尘暴事件中风速的变化幅度。苏干湖现代沉积(岩心)中Al、Fe、Ti通量变化与冷湖气象站44年的年均大风日数记录具有较好的一致性。因此,可以利用湖泊现代沉积中风成输入碎屑组分(去除有机质和碳酸盐)的Al、Fe、Ti通量作为大风尘暴事件的替代指标,以重建地质历史时期柴达木盆地粉尘源区尘暴演化序列或者粉尘释放历史。
- 元素组成 /
- 大风—尘暴事件 /
- 粉尘源区 /
- 柴达木盆地
Abstract: As a hydrologically closed lake, Lake Sugan located at the northern margin of the Qaidam Basin would be employed to study dust storm history in the northeastern Qinghai-Tibetan Plateau. The elemental compositions were analyzed for three types of samples, namely,lake surface deposits,settled sand and dust and the surface sediments from the eastern catchment, respectively. The results indicate that different samples derive from a homologous source. Al and Ti exhibit a stable gain-loss pattern during the period of the dust emission and deposition. However, Fe is enriched in the lake sediment, which possibly results from element loss by HCl treatment. Elemental characteristics of the six typical dust storms show that there are apparently positive correlations between the elemental fluxes of settled materials (Al, Fe and Ti) and the mean 10 min wind velocity and the variation coefficients (Cv) of the wind velocity. Fluxes of Al, Fe and Ti linearly increase with the increasing wind strength and the fluctuation amplitude of wind velocity. Al, Fe and Ti fluxes of the lake sediments from Lake Sugan are in line with annual day numbers (frequency) of strong wind observed at the Lenghu Meteorological Station since 1957, and therefore Al, Fe and Ti fluxes of the lake sediments organic matter and carbonate were removed from should be used as indicators of strong wind and dust storm. On this basis, we can reconstruct dust storm sequence and history of dust emission for the study area.
- elemental compositions /
- strong wind (dust storm) events /
- dust source area /
- Qaidam Basin

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柴达木盆地苏干湖沉积元素特征与大风尘暴事件

doi: 10.3724/SP.J.1140.2009.01095

兰州大学西部环境教育部重点实验室, 兰州 730000

作者简介:
宋磊(1983-),男,硕士生,环境演变与全球变化专业,E-mail:songl06@lzu.cn

ELEMENTAL CHARACTERISTICS OF SEDIMENTS FROM LAKE SUGAN IN QAIDAM BASIN AND THE STRONG WIND (DUST STORM) EVENTS

Center for Arid Environment and Paleoclimate Research, Key Laboratory of Western China's Environmental Systems, Ministry of Education, Lanzhou University, lanzhou 730000, China

计量

柴达木盆地苏干湖沉积元素特征与大风尘暴事件

doi: 10.3724/SP.J.1140.2009.01095

兰州大学西部环境教育部重点实验室, 兰州 730000

作者简介:
宋磊(1983-),男,硕士生,环境演变与全球变化专业,E-mail:songl06@lzu.cn

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ELEMENTAL CHARACTERISTICS OF SEDIMENTS FROM LAKE SUGAN IN QAIDAM BASIN AND THE STRONG WIND (DUST STORM) EVENTS

Center for Arid Environment and Paleoclimate Research, Key Laboratory of Western China's Environmental Systems, Ministry of Education, Lanzhou University, lanzhou 730000, China

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柴达木盆地苏干湖沉积元素特征与大风尘暴事件

doi: 10.3724/SP.J.1140.2009.01095

兰州大学 西部环境教育部重点实验室, 兰州 730000

作者简介: 宋磊(1983-),男,硕士生,环境演变与全球变化专业,E-mail:songl06@lzu.cn

ELEMENTAL CHARACTERISTICS OF SEDIMENTS FROM LAKE SUGAN IN QAIDAM BASIN AND THE STRONG WIND (DUST STORM) EVENTS

Center for Arid Environment and Paleoclimate Research, Key Laboratory of Western China's Environmental Systems, Ministry of Education, Lanzhou University, lanzhou 730000, China

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柴达木盆地苏干湖沉积元素特征与大风尘暴事件

doi: 10.3724/SP.J.1140.2009.01095

兰州大学 西部环境教育部重点实验室, 兰州 730000

作者简介: 宋磊(1983-),男,硕士生,环境演变与全球变化专业,E-mail:songl06@lzu.cn

English Abstract

ELEMENTAL CHARACTERISTICS OF SEDIMENTS FROM LAKE SUGAN IN QAIDAM BASIN AND THE STRONG WIND (DUST STORM) EVENTS

Center for Arid Environment and Paleoclimate Research, Key Laboratory of Western China's Environmental Systems, Ministry of Education, Lanzhou University, lanzhou 730000, China

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关于期刊

关于我们

兰州大学西部环境教育部重点实验室, 兰州 730000

作者简介:
宋磊(1983-),男,硕士生,环境演变与全球变化专业,E-mail:songl06@lzu.cn

兰州大学西部环境教育部重点实验室, 兰州 730000

作者简介:
宋磊(1983-),男,硕士生,环境演变与全球变化专业,E-mail:songl06@lzu.cn