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Analysis on the decadal scale variation of the dust storm in North china

Science china Earth {1. 2005年第12期48卷 2260-2266页

作者： kang dujuan1,{1., institute of atmospheric physics, chinese academy of sciences, beijing 100871, china 2. Environmental Fluid Mechanics Laboratory, Stanford University, Stanford CA 94305, USA 1. nzc/{1. Institute of Atmospheric Physics Chinese Academy of Sciences 100871 Beijing China 2. Environmental Fluid Mechanics Laboratory Stanford University 94305 Stanford CA USA

In this paper, the temporal variation characteristics of the dust storm in North china are investigated. Based on power spectrum analysis and wavelet analysis, 1.56-1.70 and 1.85-1.99 are chosen as the high-frequency and low-frequency dust storm decades respectively. Analysis results clearly show that the spring and wintertime anomalous {1. circulation between these two dec-ades are significantly different. Compared with the former decade, there are a strengthened polar vortex, enhanced westerlies near 50°N, and a weak East Asian major though in the winter of the latter decade. The north and center parts of the Siberian high and the Aleutian low become weak. The southerly and easterly wind anomalies appear over the north and east parts of china, which implies the weakening of East Asian winter monsoon. Meanwhile, northern china experiences warmer winters and wetter springs, which are in favor of the weakening of dust storm intensity in North china. There are significant out-of-phase relationships between dust frequency and wintertime westerly intensity, as well as between dust frequency and Arctic Oscillation. It is also found that the frequency of dust weather is strongly re-lated to winter-springtime East Asian monsoon intensity.

关键词： dust storm, climate anomaly, decadal scale variability, East Asian monsoon, AO.

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