Hf‐Nd‐Sr Isotopic Composition as Fingerprint for Long‐Range Transported Eolian Dust Deposition in Glacier Snowpack of Eastern Tibetan Plateau

Dong, Zhiwen; Shao, Yaping; Qin, Dahe; Kang, Shichang; Wei, Ting; Wang, Xuejia; Wang, Shijin

doi:10.1029/2018jd028581

Cited by 25 publications

(53 citation statements)

References 25 publications

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“…Therefore, glacier snowpack dust and cryoconite in the TP have a unique advantage in that they provide information on high-altitude dust processes (Dong et al, 2016(Dong et al, , 2020. Studies have shown that arid deserts of the TP are the main source of snowpack/cryoconite dust for glaciers in this region (Dong et al, 2016(Dong et al, , 2018. The 234 U/ 238 U isotopic ratios of typical glacial snowpack/cryoconite samples (including snowpack/cryoconite of the Laohugou Glacier and the Dunkemadi Glacier in this work) combined with the U-Sr-Nd isotope data were used to investigate the contribution of TP dust to the glaciers in surrounding areas.…”

Section: Comparing U Isotopic Composition Of Tibetan Plateau Dust Withmentioning

confidence: 99%

Uranium Isotopic Composition and Constraints on the Provenance of the Qinghai‐Tibet Plateau's Surface Dust

et al. 2022

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The production and emission of aeolian dust can provide key information on the contemporary and historical links between geological evolution and climate. Here we use 234U/238U isotope ratios and the uranium (U) comminution age method on samples collected from Qinghai‐Tibet Plateau (TP) surface dust and glacier snowpack/cryoconites to determine the erosion and potential transport provenance of the dust, regardless of petrological origin. The spatial variation of the (234U/238U) isotope ratios of TP dust showed relatively high values in the Songpan‐Ganzi‐Hoh Xil, Himalayan and the Kunlun‐Qaidam‐Qilian terranes, while showing relatively low (234U/238U) values in Lhasa and Qiangtang terranes, but among all samples the highest value appeared in the glaciation zone. Dust collected from nearby glacial areas with rugged terrain (e.g., the Qilian and Himalayan Mountains) have higher (234U/238U) values than those collected in the topologically flat non‐glacial areas. These differences are consistent with elevated erosion rates and dust comminution‐transport processes in glacial areas, which yield a major source for large quantities of fresh comminuted particles. Compared to sediments from other regions of the globe, the (234U/238U) values of the typical aeolian sinks (such as loess on the Loess Plateau and ice core dust, etc.) are generally lower in comparison to areas with high elevations where erosion rates are high. The (234U/238U) isotope values of TP dust tend to fall between the high‐elevation sites and the dust sinks, indicating the combined influence of short comminution times (tectonics, landscape dynamics, and glacial erosion) and long residence time on the TP. When compared with other central Asian dust sources, U‐Nd‐Sr isotope signatures in TP dust are distinct and can be thus used as an effective tracer of dust provenance. Using U isotopes, we show that dust originating from the TP undergoes long‐range transport and constitutes potentially significant component of the Asian and Northern Hemisphere atmospheric dust load.

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Section: Comparing U Isotopic Composition Of Tibetan Plateau Dust Withmentioning

confidence: 99%

Uranium Isotopic Composition and Constraints on the Provenance of the Qinghai‐Tibet Plateau's Surface Dust

et al. 2022

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“…The GSD characteristics indicate that three types of clastic sediments exhibit distinct GSDs in the surface sediments of Lake Lugu (Figure 3b). Samples near the center of the lake exhibit a peak at ~4 µm (Figure 3b, S17) which is similar to the grain size of the long-distance aeolian component in the Baishui glacier (81 km southwest of Lake Lugu; Dong et al, 2018). The GSDs of samples from nearshore shallow water areas near the estuary of Shankua River (Figure 3b, S46) are impacted mainly by runoff inputs coupled with lake currents.…”

Section: Interpretation Of the Grain-size Endmembers And Carbonate Comentioning

confidence: 71%

Sedimentary grain-size record of Holocene runoff fluctuations in the Lake Lugu watershed, SE Tibetan Plateau

Zhang

Chang

et al. 2020

The Holocene

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Changes in moisture conditions or precipitation in the SE Tibetan Plateau during the Holocene have been studied using various environmental archives and proxies. However, due to different interpretations of the proxies and records, the pattern of Holocene precipitation/moisture variations in the region remains unclear. A lake-sediment-based reconstruction of runoff variations, which can directly and sensitively reflect changes in precipitation, provides the opportunity to reconstruct the evolution of moisture conditions in the SE Tibetan Plateau during the Holocene. In this study, we used a well-dated sediment core (LGH2) from Lake Lugu, a deep alpine lake charged mainly by precipitation on the lake surface and by runoff from the watershed, to reconstruct variations in runoff during the Holocene. In addition, 70 lake surface sediment samples were collected to examine the spatial variation of grain size. Endmember modeling analysis of the grain-size data was used to characterize the processes of sediment transport and runoff fluctuations. The carbonate content of core LGH2 shows that the lake level was generally high during 11,600–3100 cal years BP, and that the lake basin was closed after 3100 cal years BP and semi-closed since 90 cal years BP. Grain-size endmember EM 3, which represents the runoff input clastic materials, is used to reconstruct runoff fluctuations in the Lake Lugu watershed. The record indicates a gradual increase in runoff during 11,600–9000 cal years BP, stable and high runoff during 9000–2000 cal years BP, and weak runoff and a low lake level since 2000 cal years BP. Our reconstruction of runoff fluctuations tracks changes in regional temperature and tropical SSTs rather than in boreal summer insolation. This finding supports the hypothesis that increasing tropical SSTs strengthened ITCZ convection which enhanced the flux of water vapour from the ocean to the air, and hence the moisture supplies to SW China.

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“…12 glacier (local soil: -13.6), -13.7--8.58 for Qiyi, -13.8--13.6 for Shiyi glacier (local soil: -13.8--13.6), -12.1--12.0 for Dabanshan snowpack, and -10.9--7.0 for Lenglongling glacier (Fig. 2, Dong et al, 2018). It is very clear that, based on local soil data, regional dust makes a significant contribution to these glaciers.…”

Section: The Sr-nd Data Measurement Of Glaciers At the Third Polementioning

confidence: 99%

“…Region V: Samples from the glaciers in the Qilian Mountains include snow samples from the Qilian Mountains and sand (soil and loess) samples from the Hexi Corridor, with εNd(0) values from 0.712349 to 0.73211 and 87 Sr/ 86 Sr values from -15.7 to -7.0 (Wei et al, 2017;Dong et al, 2018). The Nd(0) values have an increasing trend along the Hexi Corridor from west to east: -15.7--12.9 for Laohugou No.…”

Section: The Sr-nd Data Measurement Of Glaciers At the Third Polementioning

confidence: 99%

A database of radiogenic Sr-Nd isotopes at the "three poles”

Yang

Wang

et al. 2022

Preprint

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Abstract. The radiogenic isotope compositions of strontium (Sr) and neodymium (Nd) on the surface of the Earth are powerful tools for tracing dust sources and sinks on Earth’s surface. To differentiate between the spatial variabilities of aeolian dust sources in key cryospheric regions at the three poles (including the ‘Third Pole’ covering the high mountainous area in Asia, the Arctic and Antarctica), a dataset of the Sr-Nd isotopic compositions from the terrestrial extremely cold or arid environments in this study was compiled, similar to the method of Blanchet (2019). The database identified snow, ice, sand, soil (loess) and sediment from the modern dust samples and paleoclimatic records of the three poles based on 43 different references, with a total of 967 data points. There are 274 data points from the third pole, 302 data points from the Arctic, and 391 data points from Antarctica. The sampling and measurement methods and the quality of these data are recognized and introduced. For each pole, geographical coordinates and other information are provided. The main scientific purpose of this dataset is to provide our own measurements and collect documentation for the Sr-Nd dataset, which will be useful for determining the sources and transport pathways of dust at the three poles and to investigate whether multiple dust sources are present at each of the poles. This dataset provides exhaustive detailed documentation of the isotopic signatures at the three poles during specific time intervals, which are useful for understanding the dust sources or sinks of the three poles. The datasets are available from the National Tibetan Plateau Data Center (https://doi.org/10.11888/Cryos.tpdc.272100, Du et al., 2022).

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Hf‐Nd‐Sr Isotopic Composition as Fingerprint for Long‐Range Transported Eolian Dust Deposition in Glacier Snowpack of Eastern Tibetan Plateau

Cited by 25 publications

References 25 publications

Uranium Isotopic Composition and Constraints on the Provenance of the Qinghai‐Tibet Plateau's Surface Dust

Uranium Isotopic Composition and Constraints on the Provenance of the Qinghai‐Tibet Plateau's Surface Dust

Sedimentary grain-size record of Holocene runoff fluctuations in the Lake Lugu watershed, SE Tibetan Plateau

A database of radiogenic Sr-Nd isotopes at the "three poles”

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