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dust source of the Holocene loess-soil and pedogenic environmental changes in the upper Huaihe River

Journal of Geographical Sciences 2009年第1期19卷 107-117页

作者：李新艳黄春长庞奖励何忠 Institute of Geographic Sciences and Natural Resources Research CAS Department of Geography Shaanxi Normal University

Based on field surveys,soil samples were collected at the YPC site,Yuzhou City,Henan Province for analysis of contents of major and trace elements and their variations with XRF and comparison with the curves of magnetic susceptibility,pH value distribution,loss on ignition and particle-size *** was concluded that the dust source of loess in the upper reaches of the Huaihe River Basin was different from that in the Loess *** the Holocene pedogenic environmental changes in the upper reaches of the Huaihe River Basin were revealed.

关键词： loess palaeosol Holocene dust source upper reaches of the Huaihe River China

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Relationship Between Land Use Changes and the Production of dust sources in Kermanshah Province,Iran

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Chinese Geographical Science 2021年第6期31卷 1057-1069页

作者： AHMADI-MOLAVERDI Majid JABBARI Iraj FATHNIA Amanollah Department of Geography Faculty of Literature and HumanitiesRazi UniversityKermanshah***Iran

Recognizing land use changes(LUC)and evaluating their relationship with producing dust sources are considered effective to manage the *** Kermanshah Province,Iran as study area,dusty days from 2008 to 2015 were selected and dust sources were identified applying thermal-infrared dust index(TDI),hybrid single-particle lagrangian integrated trajectory(HYSPLIT),false color composite(FCC)and true color composite(TCC)of MODerate resolution Imaging Spectroradiometer(MODIS)***,the land use change map was produced using Landsat images in 2000 and ***,the distribution and frequency of the sources in each land-use change class and important dust production areas were ***,two non-parametric tests including Chisquare and Kruskal-Wallis were applied to examine the relationship between LUC and dust *** indicated that the distribution of dust sources was not identical in the study area,and the sources were mainly generated in the areas where land-use change had *** fact,different classes of LUC have different contributions to dust production,and the highest contribution refers to the deflation in gentle slope areas and lowlands where the rangeland has been converted into agriculture *** findings from this study are useful to manage and control dust in the identified sources.

关键词： dust source hybrid single-particle lagrangian integrated trajectory(HYSPLIT) land use change(LUC) MODerate resolution imaging spectroradiometer(MODIS) thermal-infrared dust index(TDI) Kermanshah Province,Iran Iran

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Why super sandstorm 2021 in North China?

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National Science Review 2022年第3期9卷 119-127页

作者： Zhicong Yin Yu Wan Yijia Zhang Huijun Wang Key Laboratory of Meteorological Disaster Ministry of EducationJoint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD)Nanjing University of Information Science and Technology Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of Sciences

Severe sandstorms reoccurred in the spring of 2021 after an absence for more than 10 years in North *** dust source area,located in Mongolia,suffered destructive cooling and warming in early and late winter,which loosened the land.A lack of precipitation,excessive snow melt and strong evaporation resulted in dry soil and exiguous spring vegetation.A super-strong Mongolian cyclone developed on the bare and loose ground,and easily blew and transported large amounts of sand particles into North ***,top-ranking anomalies(sea ice shift in the Barents and Kara Sea,and sea surface temperatures in the east Pacific and northwest Atlantic) were found to induce the aforementioned tremendous climate anomalies in the dust source *** es,based on large-ensemble Coupled Model Intercomparison Project Phase 6,yield results identical to the reanalysis ***,the climate variabilities at different latitudes and synoptic disturbances jointly facilitated the strongest spring sandstorm over the last decade.

关键词： sandstorm dust source Arctic sea ice La Niña cyclone

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Holocene loess and its deposition dynamics in the upper reaches of the Huaihe River

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Journal of Geographical Sciences 2011年第3期21卷 561-573页

作者： HE Zhong HUANG Chunchang ZHENG Hongbo ZHOU Jie PANG Jiangli LI Xinyan WANG Lijun Institute of Surficial Geochemistry School of Earth Science and Engineering Nanjing University Nanjing 210093 China College of Tourism and Environmental Sciences Shaanxi Normal University Xi'an 710062 China Institute of Soil and Water Conservation CAS Yangling 712100 Shaanxi China Nanjing Institute of Geography & Limnology CAS Nanjing 210008 China

The dust source and transporting system are two indispensable aspects in the process of Ioess-palaeosol accumulation. It has been proved that the dust of the Loess Plateau mainly comes from the northwestern inland gobi and desert, transported by the East Asia monsoon systems and westerlies. However, there are little researches with respect to the dust source and deposition dynamics of the upper reaches of the Huaihe River. In the present study, we investigated and collected the YPC section with high resolution in the upper reaches of the Huaihe River. The chronological frame was reconstructed by optically stimulated luminescence （QSL） dating and correlated with the published loess time series. By comparison of the magnetic susceptibility （MS） and grain size （GS） of loess-soil profile among YPC profile, XJN profile （western Loess Plateau） and the JYC profile （southern Loess Plateau）, we find similar climate change and pedogenic process between the upper reaches of the Huaihe River and the Loess Plateau, both experienced an extreme dry and the weakest pedogenesis during the last glacial, followed by a transitional episodes from the cold-dry last glacial to the warm-humid mid-Holocene and increased pedogenesis in the early Holocene, then a most humid-warm and strong pedogenesis in the mid-Holocene, and climate deterioration and decreased pedogenesis occurred during the late Holocene. But the MS of loess-soil profile sequences in the upper reaches of the Huaihe River was much lower than those in the Loess Plateau, and the GS was much coarser than those in the Loess Plateau. Comparison of GS for these three profiles revealed that there were different dust sources, which belonged to different aeolian transporting systems. The loess in the upper reaches of the Huaihe River was a wind blown deposition of near source, while the coarser dust mainly came from loose alluvial deposits of alluvial and proluvial fans of the Yellow River. The yield- ing and carrying dynamics of the

关键词： aeolian dust dust source transporting system upper reaches of the Huaihe River

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