A preliminary study on measurements of black carbon in the atmosphere of northwest Qilian Shan |
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| Authors: | Shuyu Zhao Jing Ming Cunde Xiao Weijun Sun and Xiang Qin |
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| Institution: | State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Gansu 730000, China;State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Gansu 730000, China; China National Climate Center, Beijing 100081, China;State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Gansu 730000, China;State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Gansu 730000, China; Qilian Shan Station of Glaciology and Ecologic Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Gansu 730000, China;State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Gansu 730000, China; Qilian Shan Station of Glaciology and Ecologic Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Gansu 730000, China |
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| Abstract: | 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, China. We measured the daily, monthly and seasonal variations of BC concentration in the atmosphere and discussed the possible emission sources. Black carbon background concentration in this region varied in the range of 18-72 ng/m3 with the highest in summer and the lowest in autumn. The relations between BC concentration and surface wind direction indicated that BC concentration was higher when northwest wind prevails while lower when southeast wind prevails. Air masses backward trajectories showed the potential emission sources in the northwest. Significant positive correlations between daily mean BC concentration and relative humidity indicated that BC might be one of important cloud condensation nuclei. This hypothesis needs to be confirmed further through cloud microphysical features in this region. |
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| Keywords: | black carbon Qilian Shan cloud condensation nuclei |
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