Article
Geosciences, Multidisciplinary
Jinbo Zan, Wenxiao Ning, Friedrich Heller, Xiaomin Fang, Weilin Zhang, Jian Kang
Summary: The study found that eolian loess deposits began accumulating in the western margin of the Pamir Plateau around 2.7 million years ago, representing the most complete and oldest loess-paleosol sequence in western Central Asia. The rapid desiccation of Central Asia during the late Pliocene is evidenced by the widely distributed continuous loess deposition in the region. Furthermore, the significant increase in global ice volume played a dominant role in the expansion of eolian loess deposits in Central Asia, China, and Europe, with the middle Pleistocene expansion being a crucial precondition for the establishment of modern distribution patterns of the Eurasian loess belt.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geography, Physical
Yanning Niu, Yuxin Fan, Yansong Qiao, Tongyan Lu, Chaozhu Li, Lin Qi, Sheng Wang, Shasha Peng, Yuanlong Tan
Summary: This paper aims to establish a Quaternary chronological framework in the western area of the Chinese Loess Plateau using the traditional paleomagnetic method and quartz electron spin resonance (ESR) dating. The results are validated by analyzing magnetic susceptibility and grain-size variations. The established chronological sequence provides insights into the variation of the East Asian summer monsoon and paleoclimate evolution.
QUATERNARY INTERNATIONAL
(2022)
Article
Engineering, Geological
Binghui Song, Angelos Tsinaris, Anastasios Anastasiadis, Kyriazis Pitilakis, Wenwu Chen
Summary: This study examines the small to medium strain dynamic properties of intact and recompacted loess in Lanzhou. The influence of soil structure on the dynamic properties is analyzed, and a normalized correlation is found between G/G0 and gamma/gamma 0.7, which is practically identical for both types of loess.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Zhixiang Wang, Ze Zhang, Chunju Huang, Jiangming Shen, Yu Sui, Zhiqi Qian
Summary: The study presents evidence of orbital-scale variability of the East Asian summer monsoon in the early Miocene period, with dominant cyclical patterns of approximately 100 kyr eccentricity. This variability is linked to Antarctic ice sheet modulations and changes in weathering intensity in the Lanzhou Basin, possibly influenced by changes in westerly moisture due to orogenic barriers and uplift of NE Tibet during the late Oligocene-early Miocene period.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Thermodynamics
Jianghong Zhu, Huyuan Zhang, Guoliang Ma, Yu Tan, Ying Wang
Summary: This paper measured the initial ground temperature of the Lanzhou subway in the Loess Plateau and explored the temperature field evolution of the surrounding rock in the subway tunnel. The results show that the subway has an annual variable temperature layer up to 12 meters deep with a sinusoidal distribution and phase lag. The annual constant temperature layer is located below 12 meters with a temperature of 15.2 degrees Celsius. Air temperature has the greatest influence on heat exchange, while tunnel shape and high water content have minimal effects on heat flux variation.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Geography, Physical
Qing Pan, Guoqiao Xiao, Qingyu Zhao, Ruisheng Chen, Hong Ao, Yanfei Shen, Junyao Cheng, Zongmin Zhu
Summary: This study investigates the discrepancies in the positions of the upper and lower boundaries of the Jaramillo subchron in Chinese loess among different sections. The results suggest that these discrepancies may be due to unstable primary remanent magnetization acquired by loess deposits during intervals of geomagnetic reversals or excursions with low-intensity geomagnetic field, leading to overprinting by subsequent high-intensity fields. This hypothesis may explain the observed downward shifts and anomalies in polarity zones in the loess sections.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Xiaoxue Wang, Junsheng Nie, Thomas Stevens, Haobo Zhang, Wenjiao Xiao
Summary: Considerable debate exists regarding the variation of the East Asian summer monsoon (EASM) during the late Miocene. Based on loess magnetic susceptibility (xlf) records from the Chinese Loess Plateau (CLP), this study found that the xlf patterns during the late Miocene differ from the modern monsoon climate pattern. By proposing a hypothesis and conducting research, the study concludes that the xlf data from the eastern CLP more accurately reflect the intensity of the EASM during the late Miocene.
EARTH-SCIENCE REVIEWS
(2022)
Article
Meteorology & Atmospheric Sciences
Suma Bhanu Battula, Steven Siems, Arpita Mondal, Subimal Ghosh
Summary: Studies have shown that the Western Himalayas experience increased heavy precipitation and aerosol loading, which can be attributed to changes in large-scale dynamics and anthropogenic emissions. This study examines the long-term relationship between aerosols and heavy precipitation from 2001 to 2020, considering the changes in dynamics and eliminating the influence of meteorological covariates. The analysis reveals a significant positive correlation between aerosols and heavy precipitation in certain monsoonal regimes, while the correlation is insignificant in others. It is also found that dynamical changes result in distinct aerosol-heavy precipitation relations and microphysical processes causing heavy precipitation.
ATMOSPHERIC RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Liguo Yang, Shengjun Shao, Fuquan Wang, Liqin Wang
Summary: Reusing excavated soil as roadbed filling material is beneficial for the sustainable development of expressway engineering. This study focuses on the loess subgrade of an expressway in Lanzhou and conducts experimental studies to analyze the effects of different factors on the axial plastic deformation and rebound deformation of compacted loess. The results show that the vertical cyclic stress ratio has a significant effect on the axial deformation, and increasing the torsional shear stress ratio increases the development of axial deformation. Initial static shear stress and intermediate principal stress coefficient have varying effects on the deformation. The research provides a calculation model for the axial plastic strain of compacted loess under traffic loads and offers important insights for durability and settlement prediction in loess engineering.
Article
Geosciences, Multidisciplinary
Rui Zhang, Xiaojuan Li, Yong Xu, Jianxing Li, Lu Sun, Leping Yue, Feng Pan, Feng Xian, Xiaohao Wei, Yuge Cao
Summary: This study conducted magnetostratigraphy and cyclostratigraphy on an eolian red clay sequence in the eastern Chinese Loess Plateau, and found that the unconventional 173-kyr obliquity modulated cycle is significant for reconstructing terrestrial air circulation and shows distinct characteristics in the cyclic sedimentary patterns of East Asia monsoon deposits.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geography, Physical
Helena Hercman, Michal Gasirowski, Jacek Szczygiel, Pavel Bella, Michal Gradzinski, Marcin Blaszczyk, Sarka Matouskova, Petr Pruner, Pavel Bosak
Summary: Karst systems can control surface water flow and erosion efficiency. By using the ages of speleothems, we determined the history of the Dema-Nova Valley incision. The well-developed karst system captures surface water and reduces erosion, leading to delayed incision of the valley.
Article
Green & Sustainable Science & Technology
Hua Cheng, Baocheng Jin, Kai Luo, Jiuying Pei, Xueli Zhang, Yonghong Zhang, Jiaqi Tang, Qin Yang, Guojun Sun
Summary: The study revealed that in the semiarid hilly grassland of the Loess Plateau, grazing intensity has a significant impact on vegetation, with grazing having detrimental effects on plant growth but moderate grazing appearing to facilitate plant growth rate at the end of the growing season.
Article
Geography, Physical
Xinbo Gao, Qingzhen Hao, Yansong Qiao, Shuzhen Peng, Nan Li, Wei Zhang, Long Han, Chenglong Deng, Slobodan B. Markovic, Zhengtang Guo
Summary: The research found that the iron oxides in the Xiashu loess were partially dissolved, with estimated minimum mean annual precipitation levels of approximately 793 mm. There is a general lack of correlation between the stratigraphy and magnetic properties of loess deposits in subtropical China, mainly due to the relatively low continuity of dust deposition and iron oxide dissolution.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Environmental Sciences
Xuelian Guo, Lusheng He, Guoyong Zhao, Weibin Wang, Huairen Cao, Hao Wu
Summary: The evolution of Holocene climate in the Chinese Loess Plateau was studied through the analysis of grain size and magnetic susceptibility of paleosols. The results show that the climate during the Holocene can be divided into three phases, with changes in the intensity of the East Asian Summer Monsoon and East Asian Winter Monsoon. These findings provide important insights into the understanding of Holocene climate change.
CHINESE GEOGRAPHICAL SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Marcos Aurell, Diego Torrome, Jose M. Gasca, Pablo Calvin, Manuel Perez-Pueyo, Jara Parrilla-Bel, Eduardo Medrano-Aguado, Carles Martin-Closas, Alba Vicente, Pablo Sierra-Campos, Jose I. Canudo
Summary: This study characterizes the uppermost Cretaceous sedimentary succession of the Allueva Fm in the Montalban subbasin and provides new data for its age. The results suggest a south to north migration of tectonic activity and subsident subbasins. Additionally, significant vertebrate fossil sites have been discovered.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Li JiJun, Zhou ShangZhe, Zhao ZhiJun, Zhang Jun
SCIENCE CHINA-EARTH SCIENCES
(2015)
Article
Geosciences, Multidisciplinary
Li Jijun, Zhang Jun, Song Chunhui, Zhao Zhijun, Zhang Yong, Wang Xiuxi, Zhang Jianming, Cui Qiaoyu
SCIENCE IN CHINA SERIES D-EARTH SCIENCES
(2006)