Iron oxides in the cryoconite of glaciers on the Tibetan Plateau: abundance, speciation and implications
文献类型:期刊论文
作者 | Liu, YQ (Liu, Yongqin)2; Ji, JF (Ji, Junfeng)1; Gao, SP (Gao, Shaopeng)2; Zhao, WC (Zhao, Wancang)1; Wu, GM (Wu, Guangming)2,6; Wang, X (Wang, Xin)4; Kang, SC (Kang, Shichang)3,5; Zhang, YL (Zhang, Yulan)3; Cong, ZY (Cong, Zhiyuan)2,5 |
刊名 | CRYOSPHERE |
出版日期 | 2018-12-05 |
卷号 | 12期号:10页码:3177-3186 |
ISSN号 | 1994-0416 |
关键词 | Light-absorbing Impurities Black Carbon Mineral Dust Determining Hematite Optical-properties Elemental Carbon Northern China Central-asia Desert Dust Snow |
DOI | 10.5194/tc-12-3177-2018 |
英文摘要 | Cryoconite is a mixture of impurities and ice visually represented by dark colors present in the ablation zone of glaciers. As an important constituent of light-absorbing impurities on the glacier surface, iron oxides influence the radiative properties of mineral dust and thus its impact on ice melting processes. In particular, the distinct optical properties between hematite and goethite (the major iron oxide species) highlight the necessity to obtain accurate knowledge about their abundance and geochemical behavior. Cryoconite samples from five glaciers in different regions of the Tibetan Plateau (TP) and surroundings were studied. The iron abundance in the cryoconite from TP glaciers ranged from 3.40 % to 4.90 % by mass, in accordance with typical natural background levels. Because the light absorption capacity of mineral dust essentially depends on the presence of iron oxides (i.e., free iron), iron oxides were extracted and determined using diffuse reflectance spectroscopy. The ratios of free to total iron for the five glaciers ranged from 0.31 to 0.70, emphasizing that iron in the form of oxides should be considered rather than total iron in the albedo and radiative modeling. Furthermore, the goethite content in iron oxides (in mass fraction) ranged from 81 % to 98 %, showing that goethite was the predominant form among the glaciers. Using the abundance and speciation of iron oxides as well as their optical properties, the total light absorption was quantitatively attributed to goethite, hematite, black carbon (BC) and organic matters at 450 and 600 nm wavelengths. We found that the goethite played a stronger role than BC at shorter wavelengths for most glaciers. Such findings were essential to understand the relative significance of anthropogenic and natural effects, and then taking the proper mitigation measures. |
学科主题 | 地理学 |
WOS研究方向 | Physical Geography ; Geology |
语种 | 英语 |
出版者 | COPERNICUS GESELLSCHAFT MBH |
WOS记录号 | WOS:000446812400001 |
源URL | [http://ir.itpcas.ac.cn/handle/131C11/8522] |
专题 | 青藏高原研究所_图书馆 |
通讯作者 | Kang, SC (Kang, Shichang) |
作者单位 | 1.Nanjing Univ, Sch Earth Sci & Engn, Key Lab Surficial Geochem, Minist Educ, Nanjing 210023, Jiangsu, Peoples R China; 2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China; 3.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Gansu, Peoples R China; 4.Lanzhou Univ, Coll Atmospher Sci, Minist Educ, Key Lab Semiarid Climate Change, Lanzhou 730000, Gansu, Peoples R China; 5.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China; 6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China. |
推荐引用方式 GB/T 7714 | Liu, YQ ,Ji, JF ,Gao, SP ,et al. Iron oxides in the cryoconite of glaciers on the Tibetan Plateau: abundance, speciation and implications[J]. CRYOSPHERE,2018,12(10):3177-3186. |
APA | Liu, YQ .,Ji, JF .,Gao, SP .,Zhao, WC .,Wu, GM .,...&Cong, ZY .(2018).Iron oxides in the cryoconite of glaciers on the Tibetan Plateau: abundance, speciation and implications.CRYOSPHERE,12(10),3177-3186. |
MLA | Liu, YQ ,et al."Iron oxides in the cryoconite of glaciers on the Tibetan Plateau: abundance, speciation and implications".CRYOSPHERE 12.10(2018):3177-3186. |
入库方式: OAI收割
来源:青藏高原研究所
其他版本
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。