Experimental analysis of dust deposition and physical weathering intensity in the Gobi Desert  

作　　者：Xunming WANG Danfeng LI Bingqi ZHU Zhenting WANG Caixia ZHANG Xin GENG Likun HAN Yang ZHENG Diwen CAI 

机构地区：[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]College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China [3]Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China

出　　处：《Frontiers of Earth Science》2024年第4期743-751,共9页地球科学前沿(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant No.41930640);Key Frontier Program of Chinese Academy of Sciences(No.QYZDJ-SSWDQC043).

摘　　要：Surface soil materials from the Gobi Desert were sieved into fraction groups of 0.063–0.125,0.125–0.25,0.25–0.5,0.5–1,and 1–2 mm.These samples were placed in a field for a physical weathering and dust deposition experiment.In the natural Gobi Desert environment,the dust-sized fractions(<0.063 mm in diameter)produced by physical weathering and via dust deposition in the above groups were 1387±124,702±70,698±47,742±101,and 769±75 g·m−2,respectively,from 18 October 2020 to 18 December 2021.Dust deposition during the same period was 611±55 g·m−2.For the same respective groups,5.32±0.76%,0.58±0.27%,0.53±0.18%,0.80±0.52%,and 0.98±0.31%(by weight)of the bulk samples were weathered into dust-sized fractions during the experimental period.The physical weathering intensities were 23.95%,14.96%,8.90%,and 2.81%by weight for fraction groups of 2–4,4–8,8–16,and>16 mm,respectively.The fine-grained materials of the gravel were more sensitive to physical weathering than coarse materials.In natural environments,the processes of dust deposition and physical weathering were key factors affecting the surface topographical equilibrium of the Gobi Desert and dust emission in Asia.

关 键 词：physical weathering/dust deposition/Gobi Desert/sand activity 

分 类 号：P59[天文地球—地球化学]