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A preliminary study on measurements of black carbon in the atmosphere of northwest qilian shan

Journal of Environmental Sciences 2012年第1期24卷 152-159页

作者： Shuyu Zhao Jing Ming Cunde Xiao Weijun Sun Xiang Qin State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesGansu 730000China China National Climate Center Beijing 100081China qilian shan Station of Glaciology and Ecologic Environment Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesGansu 730000China

Black carbon （BC） concentration and meteorological data are measured discontinuously from May 2009 to March 2011,at the qilian shan Station of Glaciology and Ecologic Environment （hereafter ＂QSSGEE＂）,located near the terminal of the Laohugou No.12 Glacier in northwestern qilian shan,*** measured the daily,monthly and seasonal variations of BC concentration in the atmosphere and discussed the possible emission *** carbon background concentration in this region varied in the range of 18–72 ng/m 3 with the highest in summer and the lowest in *** relations between BC concentration and surface wind direction indicated that BC concentration was higher when northwest wind prevails while lower when southeast wind *** masses backward trajectories showed the potential emission sources in the *** positive correlations between daily mean BC concentration and relative humidity indicated that BC might be one of important cloud condensation *** hypothesis needs to be confirmed further through cloud microphysical features in this region.

关键词： black carbon qilian shan cloud condensation nuclei

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Late Quaternary Tectonic Activity and Slip Rates of Active Faults in the Western Hexi Corridor,NW China

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Journal of Earth Science 2020年第5期31卷 968-977页

作者： Xingwang Liu Daoyang Yuan Qi Su Bo Zhang Lanzhou National Observatory of Geophysics、Lanzhou 730000 China L anzhou Institute of Geotechnique and Earthquake China Earthquake AdministrationLanzhou 730000China School of Earth Science and Engineering Nanjing UniversityNanjing 210046China

The Yinwashan and Xinminpu faults are located in the Jiuxi Basin in the western end of the Hexi Corridor. The determination of their activity and slip rates is of great significance for understanding the eastward extension of the Altyn Tagh fault. Based on geological and geomorphologic field survey, trench excavation, optically stimulated luminescence dating, we define the fault geometry and kinematic properties of the two faults. Based on fault scarps measurement using differential GPS and 10 Be surface exposure dating, we determined vertical slip rate of 0.09±0.01 mm/yr for the Yinwashan fault and 0.1±0.02 mm/yr for the Xinminpu fault. Using the dips observed in trenches and natural sections, we estimated horizontal shortening rates of 0.05±0.03 and 0.23±0.06 mm/yr, respectively. No significant strike slip motion is observed on these two faults, and we infer that this region was dominated by horizontal shortening in the Late Quaternary. Although the shortening rate is quite low on each individual fault, together with other faults in this area, these two faults have an essential role in transferring slip from the eastern end of the Altyn Tagh fault and in accommodating the northeastward growth of Tibetan Plateau.

关键词： Hexi Corridor qilian shan slip rate crustal shortening active fault

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