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Relationship between East Asian Monsoon and dust weather frequency over Beijing

Advances in Atmospheric Sciences 2010年第6期27卷 1389-1398页

作者：武云飞张仁健韩志伟曾昭美 Key Laboratory of Regional Climate-Environment Research for Temperate East Asia Chinese Academy of Sciences Graduate University Chinese Academy of Sciences

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 coeffcients 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 coeffcients 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.

关键词： dust weather frequency East Asian Monsoon correlation

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Two different periods of high dust weather frequency in northern China

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Atmospheric and Oceanic Science Letters 2016年第4期9卷 263-269页

作者： FAN Ke XIE Zhi-Ming XU Zhi-Qing Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjingChina University of the Chinese Academy of Sciences BeijingChina Climate Change Research Center Chinese Academy of SciencesBeijingChina

This study reveals that, during the period 1966-2014, dust weather frequency （DWF） in northern China （north of 30°N） features two high-DWF periods, in 1966-1979 （PI） and 2000-2014 （P2）, when the linear trend of DWF is removed during the study period. Here, DWF denotes the number of days of dust weather events in the spring season （March-April-May）, including dust haze, blowing dust, and dust storms, which occurred in northern China. The results show that the DWF is much higher in PI than in P2, with increased DWF distributed over southern Xinjiang, the central part of northern China. The main cause is the SST difference in the Atlantic and Pacific between the two periods. It is also found that a meridional teleconnection over East Asia in PI and a zonal wave-like pattern over Eurasia in P2 at 200 hPa play a significant role in the interannual variability in the two periods, respectively. SST over the subtropical North Atlantic （extratropical SST between the Norwegian and Barents seas） may partly contribute to the upper-level meridional （zonal） teleconnection in PI （P2）.

关键词： dust weather frequency northern China meridionalteleconnection zonal wave-like pattern North AtlanticSST

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