The environmental implications for dust in high-alpine snow and ice cores in Asian mountains

Wu, Guangjian; Zhang, Chenglong; Zhang, Xuelei; Xu, Tong; Yan, Ningning; Gao, Shaopeng

doi:10.1016/j.gloplacha.2014.11.007

Cited by 22 publications

(18 citation statements)

References 30 publications

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“…Among the sites studied, the ratio varied from 0.53 (Puruogangri) to 0.80 (Zangsegangri). The Muztagata ice core dust has the same ratio as the aerosol, indicating that they have the same source, as shown by the element composition (Wu et al, 2015). The Hm/Gt ratio of Tibetan ice core dust (0.68) is a little higher than that of the aerosol dust over northern China (0.54, Shen et al, 2006).…”

Section: The Effect Of Particle Size On the First Derivative Of Reflementioning

confidence: 85%

“…on the surface of Qiyi Glacier (39.238N, 97.758E) in 2009 and kept frozen for experimental analysis. Particle size sorting was performed by Stokes sedimentation equation for the cryoconite (Wu et al, 2015). Then the bulk and the fine fractions (B20 mm) were analysed for their elemental composition and spectrometry to reveal the possible size effect on the DRS results.…”

Section: Sample Collectionmentioning

confidence: 99%

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The visible spectroscopy of iron oxide minerals in dust particles from ice cores on the Tibetan Plateau

Xu²,

Zhang

et al. 2016

Tellus B: Chemical and Physical Meteorology

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Goethite (Gt) and hematite (Hm) are the most abundant forms of iron oxides in dust and the major light absorbers in the shortwave spectrum in air and snow. Diffuse reflectance spectrometry was performed to investigate the reflectance spectra of goethite and hematite in dust particles from ice cores, aerosol samples and glacier cryoconite on the northern and central Tibetan Plateau. The results showed that two peaks in the first derivative value of the spectra at 430 and 560 nm were determined to be goethite and hematite, respectively. The high iron content samples have a higher first derivative value, and prominent and much more distinct peaks for Hm and Gt. We propose that the strength of the Hm and Gt peaks may probe the iron content, and then in our samples hematite has a stronger correlation than goethite. However, when the iron content reaches a threshold, the iron oxides have little or no impact on the reflectance spectra. The fine fraction of glacier dust has a greater abundance of iron, and the first derivative values of hematite are higher than goethite, indicating that hematite might be concentrated in the fine fraction. The distinguishable differences in the Hm/Gt ratio among these ice core samples and other aerosol data indicate the regional to continental difference in composition, which can be used to simplify the iron oxides in snow radiation models.

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Section: The Effect Of Particle Size On the First Derivative Of Reflementioning

confidence: 85%

Section: Sample Collectionmentioning

confidence: 99%

The visible spectroscopy of iron oxide minerals in dust particles from ice cores on the Tibetan Plateau

Xu²,

Zhang

et al. 2016

Tellus B: Chemical and Physical Meteorology

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“…化学特征也逐渐引起注意, 如普若岗日冰芯不溶微粒Na和K等元素显示出与源区气候环境的演变具有较好一致性的特点 [17] ; 青藏高原不同地区的雪冰样品的Sr-Nd同位素组成 [18,19] 和稀土元素(REEs) [20] 的分析则在其源地区分方面取得了进展.…”

Section: 此外近年来青藏高原雪冰中不溶微粒的元素地球unclassified

“…早期研究显示, 慕士塔格冰芯微粒浓度的峰值主要出现在夏季, 通过对比可能源区沙尘事件的发生季节, 推断其主要来源为中亚粉尘源区 , 较少部分来自于中国西北粉尘源区 [14] , 该地区气溶胶光学厚度在夏季较高的现象也证实了这一点 [34] . 另外该地区雪冰稀土元素(REEs)组成显示局地冰碛物和地表土壤的贡献较少, 亚洲沙漠的贡献最大 [20] . 除这一源区之外, 慕士塔格雪冰粉尘中Sr-Nd同位素值还表现出与青藏高原北缘沙漠一致的现象, 这说明该粉尘源区也对慕士塔格地区冰芯粉尘有一定贡献 [18] .…”

Section: 污化层记录与现代观测记录的对比和可能源区分析unclassified

Variation of atmospheric dust over the past 100 years recorded by visible dusty layers of the Kuokuosele ice core, western Tibetan Plateau

et al. 2016

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“…We suggest that some water-soluble Cacontaining particles (such as calcite) dissolve during melting (melting occurs under room temperature and lasts for up to 10 h) and are lost during filtration, reducing their reported percentage. The element composition of the insoluble dust fraction (particles) by inductively coupled plasma-mass spectrometer from the three ice cores reveals that the Ca/Al ratio (0.27 in Dunde, n = 16; 0.20 in Muztagata, n = 8; 0.36 in PLZ4, n = 38) (Wu and others, 2015) is lower than the upper continental crust average (0.37; Taylor and McLennan, 1995), supporting the above assumption concerning this dissolution. The depletion of Ca in ice core dust particles suggest that some Ca might be scavenged during dust transport and/or dissolved during melting, which contributes to the very low abundance of calcite in dust from high-alpine snow.…”

Section: The Fe-rich and Ca-rich Particlesmentioning

confidence: 99%

Mineralogical and morphological properties of individual dust particles in ice cores from the Tibetan Plateau

Zhang

et al. 2016

J. Glaciol.

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ABSTRACT. Using a field emission scanning electron microscope and energy-dispersive X-ray spectrometer (FESEM−EDS), individual insoluble dust particles in ice cores recovered from the northern (Dunde), western (Muztagata) and south-eastern (Palong-Zangbo) Tibetan Plateau were analysed in order to reveal the mineralogical and morphological characteristics of the analogue of long-range transported Asian dust. The results reveal that the dust particles are mainly composed of quartz (17-36%, number abundance), clay (37-48%) and feldspar (12-18%). Illite and chlorite are the dominant clay species, while kaolinite is rarely observed. For the three sites, regional differences in the mineral assemblages are significant, in particular the abundance of quartz, chlorite and muscovite species, reflecting the regional provenance of these dust particles and the climatic regime in their source areas. Oxide ratios in clays indicate different weathering strengths of the particles in their source regions, with a higher K 2 O/(SiO 2 + Al 2 O 3 ) in the western and northern Tibetan Plateau. The individual particles have modes of 1.48 and 1.53 in the aspect ratio and circularity distribution respectively. No significant relationship between aspect ratio and circularity was found. Quartz and feldspar particles have a narrow aspect ratio distribution. Muscovite particles have the coarsest grain size, while chlorite particles have the finest.

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The environmental implications for dust in high-alpine snow and ice cores in Asian mountains

Cited by 22 publications

References 30 publications

The visible spectroscopy of iron oxide minerals in dust particles from ice cores on the Tibetan Plateau

The visible spectroscopy of iron oxide minerals in dust particles from ice cores on the Tibetan Plateau

Variation of atmospheric dust over the past 100 years recorded by visible dusty layers of the Kuokuosele ice core, western Tibetan Plateau

Mineralogical and morphological properties of individual dust particles in ice cores from the Tibetan Plateau

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