Variation in dustfall on the western Chinese Loess Plateau
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ORIGINAL PAPER
Variation in dustfall on the western Chinese Loess Plateau Xunming Wang 1,2 & Diwen Cai 1,2 & Junpeng Lou 1,3 & Zhenghua Tao 1 & Hui Li 4 & Caixia Zhang 4 Received: 12 July 2019 / Accepted: 7 October 2020 # Saudi Society for Geosciences 2020
Abstract Dustfall samples from the western Chinese Loess Plateau (CLP) were collected from 2013 to 2016 at Jiuzhoutai for dustfall variation analysis. Results showed that the seasonal dustfall variations were non-significant in the region, indicating dustfall sources with inconsistent patterns largely contributed to the modern loess formation. The average rate of loess accumulation was approximately 0.34 mm/year, which is much higher compared to the other periods of the Holocene. In addition, the lack of regular patterns of dustfall contents in the coarse fraction (> 50 μm in diameter) indicates a proximal source with crustal origins, which is a dominant source for the modern loess. From 2013 to 2016, the dustfall from crustal origins increased by approximately 19%, and among those collected dustfall, approximately 24% came from pollutants, indicating that anthropogenic activities such as industrial pollutants and vehicle emissions played an important role in modern loess accumulation. Keywords Dustfall . Pollutant . Loess . Source . Chinese Loess Plateau
Introduction Dust generated from the northeastern Tibetan Plateau (Pullen et al. 2011; Liu et al. 2017; Bird et al. 2020), central Asia (Sun and Zhu 2010; Ma et al. 2015; Jia et al. 2019), Mongolia (Xiao et al. 2012), and the Yellow River (Stevens et al. 2013a, b; Nie et al. 2014; Pan et al. 2016) deposited in dry and wet forms becomes a potential source of loess to the Chinese Loess Plateau (abbr., CLP). The main crustal sources of loess in these regions include various geomorphologic settings, such as the sandy deserts, Gobi deserts, deflation pans, and piedmont alluvial fans (e.g., Torii et al. Responsible Editor: Stefan Grab * Junpeng Lou [email protected] 1
Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Department of Hydraulic Engineering, Tsinghua University, Beijing 10084, China
4
Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
2001; Sun 2002; Wang et al. 2006, 2008, 2009; Kapp et al. 2011; Zhang et al. 2018). After passing through the postdepositional weathering and pedogenesis processes (Liang et al. 2009; Zhang et al. 2012), various environmental records in the loess stratigraphy were used as proxies to reconstruct regional paleoenvironments (Sun 2005; Jeong et al. 2008; Hu et al. 2013) and past atmospheric circulations (Bird et al. 2020). Despite the impacts of multiple sources and changes in the local to regional atmospheric circulations (Kreutz and Sholkovitz 2000), variat
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