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Dust Storms in North China in 2002: A Case Study of the Low Frequency Oscillation

机译:2002年华北沙尘暴:以低频振荡为例

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摘要

在在灰尘天气的半球和它的可能的角色的低频率摆动在 2002 在诺思中国上袭击事件作为案例研究被分析。结果证明阿留申群岛之土人 Low 在 30 60 天的摆动上在南半球与环极涡旋被连接,与趋于加深可能对尘暴事件的产生有用的阿留申群岛之土人 Low 的弱环极涡旋。在这后面的可能的机制是吝啬的经向环流的内部半球的相互作用,与在东亚上的主要可变性。在在上面的水平对流层的南半球的高纬度的带的吝啬的偏午可以带北半球的,它然后在北半球影响地方性环流。因此,低频率摆动电视连接是在在诺思中国上在南半球发行量和灰尘事件之间联合的一个可能的连接。然而,内部低频率摆动的年变化是不清楚的。
机译:The low frequency oscillation in both hemispheres and its possible role in the dust weather storm events over North China in 2002 are analyzed as a case study. Results show that the Aleutian Low is linked with the Circumpolar Vortex in the Southern Hemisphere on a 30-60-day oscillation, with a weak Circumpolar Vortex tending to deepen the Aleutian Low which may be helpful for the generation of dust storm events.The possible mechanism behind this is the inter-hemispheric interaction of the mean meridional circulation,with the major variability over East Asia. The zonal mean westerly wind at high latitudes of the Southern Hemisphere in the upper level troposphere may lead that of the Northern Hemisphere, which then impacts the local circulation in the Northern Hemisphere. Thus, the low frequency oscillation teleconnection is one possible linkage in the coupling between the Southern Hemisphere circulation and dust events over North China. However, the interannual variation of the low frequency oscillation is unclear.

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