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Volume 27 Issue 6

Nov.  2010

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2010 >  27(6): 1389-1398

Relationship between East Asian Monsoon and Dust Weather Frequency over Beijing

  • 1.

    Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Chinese Academy of Sciences, Beijing 100029, Graduate University, Chinese Academy of Sciences, Beijing 100049,Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Chinese Academy of Sciences, Beijing 100029,Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Chinese Academy of Sciences, Beijing 100029,Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Chinese Academy of Sciences, Beijing 100029


doi: 10.1007/s00376-010-9181-5

  • The relationship between dust weather frequency (DWF), which denotes the number of days of dust weather events, over Beijing and the East Asian Monsoon (EAM) was studied using DWF data for Beijing during the period 1951--2006. Results show that, during this period, the blowing-dust weather frequency (BDWF), as well as the indices of East Asian winter monsoon (EAWM) and East Asian summer monsoon (EASM), all decreased considerably, with a t-test confidence level of 99%. The correlation coefficients between the chosen EAWM index and BDWF over Beijing in winter and the following spring were 0.34 and 0.33, respectively, with significance levels of 0.01 and 0.02, respectively. For the chosen EASM index and BDWF, these correlation coefficients were 0.51 and 0.45, respectively, with both at a confidence level exceeding 99.9%. With the linear trends removed, the values (in the same order as above) were 0.14, 0.14, -0.12, and -0.09, all not significant at the 95% confidence level. Clearly, the EAM relates mainly to DWF over long timescales. To a certain extent, the EAM might have some impact on DWF by affecting the associated surface air temperature and precipitation during the corresponding time period in sand-dust source regions at the interannual scale. A stronger (weaker) EAWM might advance (suppress) the occurrence of DWF, and the opposite for the EASM.
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    [2] HUANG Ronghui, ZHOU Liantong, CHEN Wen, 2003: The Progresses of Recent Studies on the Variabilities of the East Asian Monsoon and Their Causes, ADVANCES IN ATMOSPHERIC SCIENCES, 20, 55-69.  doi: 10.1007/BF03342050
    [3] SUN Li, SHEN Baizhu, GAO Zongting, SUI Bo, Lesheng BAI, Sheng-Hung WANG, AN Gang, LI Jian, 2007: The Impacts of Moisture Transport of East Asian Monsoon on Summer Precipitation in Northeast China, ADVANCES IN ATMOSPHERIC SCIENCES, 24, 606-618.  doi: 10.1007/s00376-007-0606-8
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    • Manuscript History

    Manuscript received: 10 November 2010
    Manuscript revised: 10 November 2010
    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

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    Relationship between East Asian Monsoon and Dust Weather Frequency over Beijing

    • 1. Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Chinese Academy of Sciences, Beijing 100029, Graduate University, Chinese Academy of Sciences, Beijing 100049,Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Chinese Academy of Sciences, Beijing 100029,Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Chinese Academy of Sciences, Beijing 100029,Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Chinese Academy of Sciences, Beijing 100029
    • Manuscript received: 2010-11-10
    • Manuscript revised: 2010-11-10

    Abstract: The relationship between dust weather frequency (DWF), which denotes the number of days of dust weather events, over Beijing and the East Asian Monsoon (EAM) was studied using DWF data for Beijing during the period 1951--2006. Results show that, during this period, the blowing-dust weather frequency (BDWF), as well as the indices of East Asian winter monsoon (EAWM) and East Asian summer monsoon (EASM), all decreased considerably, with a t-test confidence level of 99%. The correlation coefficients between the chosen EAWM index and BDWF over Beijing in winter and the following spring were 0.34 and 0.33, respectively, with significance levels of 0.01 and 0.02, respectively. For the chosen EASM index and BDWF, these correlation coefficients were 0.51 and 0.45, respectively, with both at a confidence level exceeding 99.9%. With the linear trends removed, the values (in the same order as above) were 0.14, 0.14, -0.12, and -0.09, all not significant at the 95% confidence level. Clearly, the EAM relates mainly to DWF over long timescales. To a certain extent, the EAM might have some impact on DWF by affecting the associated surface air temperature and precipitation during the corresponding time period in sand-dust source regions at the interannual scale. A stronger (weaker) EAWM might advance (suppress) the occurrence of DWF, and the opposite for the EASM.

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