检索结果-南通市图书馆

Composition， Distribution and Constraint Factors of Fe Isotope(δFe) in the Surface Soils of the Tibetan Plateau

Journal of Earth Science 2024年

作者： Ting Wei Zhiwen Dong eric parteli Xiaoli Liu Shichang Kang Yaping Shao State Key Laboratory of Cryosphere Sciences， Northwest Institute of Eco-Environment and Resources， Chinese Academy of Sciences Hubei Key Laboratory of Regional Ecology and Environmental Change， School of Geography and Information Engineering， China University of Geosciences Faculty of Physics， University of Duisburg-Essen Institute for Geophysics and Meteorology， University of Cologne

Iron isotopes， represented by δ56Fe， serve as valuable tools for constraining the surface iron processes and as potent tracers for studying the biogeochemical cycle of iron. Nevertheless， our comprehension of iron isotopes in the land surface processes of the Tibetan Plateau （TP） remains limited. In this study， we present the results of iron isotopic composition (δ56Fe) in the surface soils of the TP， encompassing both glacial and non-glacial regions characterized by rugged and flat topographies. Our findings reveal that soil δ56Fe values ranged from -0.01±0.05‰ to 0.14±0.01‰， with the highest values observed in eastern locations （0.14‰） and the lowest appeared in the northeast （-0.1‰）. On a global scale， the δ56Fe values observed in Tibetan soils exhibited relatively small variability compared to reservoirs marked by significant iron isotope fractionation. By contrast， the range of TP soils measured here was slightly larger than that of the Chinese Loess. Furthermore， we discerned noticeable spatial variations in δ56Fe across the large-scale region of TP， indicating a gradual increase trend from the northeast to the south and from the west to the east. These regional disparities in δ56Fe likely arise from a combination of constraining factors， including differences in mineralogy， lithological variations， organic matter content， and variations in chemical weathering intensity. This study is pivotal in advancing our understanding of land surface iron isotope δ56Fe dynamics and its role in the biogeochemical cycle within the TP region.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Uranium isotopes of aeolian dust deposited in northern Tibetan Plateau glaciers:Implications for tracing aeolian dust provenance

引用

Fundamental Research 2022年第5期2卷 716-726页

作者： Xiaoyu Jiao Zhiwen Dong Janice Brahney eric J.R.parteli Fangzhou Li Marcelli Augusto Ting Wei State Key Laboratory of Cryosphere Sciences Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences(CAS)Lanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Department of Watershed Sciences Utah State UniversityLoganUT 84322USA Faculty of Physics University of Duisburg-EssenDuisburg 47057Germany School of Atmospheric Sciences Sun Yat-sen UniversityGuangzhou 510275China CNR-Istituto Struttura della Materia and Elettra-Sincrotrone Trieste Basovizza Area Science ParkTrieste 34149Italy

Asian dust comprises a large portion of the northern hemisphere atmospheric dust load,thereby exerting substantial influence on the Earth’s climate,global biogeochemistry and hydrological cycle through accelerated snow and ice *** deposited on alpine glaciers encodes information on broad scale atmospheric-environmental ***(^(234)U/^(238)U)values of dust fine particulates can reflect the comminuting time and intermediate processes;thus,it provides a new method for the provenance of aeolian dust in the glacial snowpack/*** we present results from a comprehensive survey of uranium isotopic concentrations in dust collected from cryoconites on the glaciers of the northern Tibetan Plateau(TP).These results indicate significant spatial heterogeneity in the(^(234)U/^(238)U)values associated with snowpack/cryoconite dust over a broad range of glaciers in the northern *** values of the(^(234)U/^(238)U)ratio in the glaciers of western Qilian Mountains(Qiyi Glacier,Shiyi Glacier,Laohugou Glacier No.12)were the highest,followed by the Tanggula(Dunkemadi Glacier)and Kunlun Mountains(Yuzhufeng Glacier),whereas these values were the lowest in the eastern Qilian Mountains(Jingyangling Snowpack,Dabanshan Snowpack,Lenglongling Glacier).By including the analysis of Sr-Nd isotopic compositions,we find the spatial isotopic distribution reflects a combination of local dust,which is associated with short comminuting times,and dust transported over long *** data indicate that the dust production in the west and north TP,Alxa arid lands and Gobi Deserts,may have a significant impact on the TP ***,U-Sr-Nd isotopic composition and end-member mixing models(EMMA)were used in our study to find out the relative contribution of distinct Asian dust sources to the dust budget in the TP *** results reveal that snowpack/cryoconite dust is derived from both local sources(low comminution signatures)as well as other dust sources in th

关键词： Uranium isotopes Aeolian dust provenance (^(234)U/^(238)U)values Dust budget Tibetan Plateau glaciers

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：