【摘要】 2 0 0 0年 4月 12日 ,青海省北部及甘肃河西走廊出现了一次大风、强沙尘暴天气。文中从天气事实、地面形势、中小尺度天气系统及高空环流形势等方面 ,与 1993年 5月 5日黑风进行了对比分析。分析结果表明 ,①这两次黑风天气均是由强冷空气沿西北路径爆发而引发的 ,但由于两次黑风天气的冷空气强度、锋区南压程度、高低空急流配置等不同 ,因此造成两次黑风天气影响范围、强度也有所不同。②中小尺度低压系统对扬沙、浮尘及沙尘暴天气激化为黑风起了重要的作用。更多还原

【Abstract】 A severe sandstorm occurred in north of Qinghai province and in Hexi corridor of Gansu province. This paper made a contrast and analysis about sandstorms on weather fact, surface system, middle-scale and small-scale weather system,circulation position in high altitude and so on. It showed that, ①The cold air that came from northwest caused two severe sandstorms, but because of the intensity of cold air and distance of cold front towards south and collocation of high and low jet were different on the eve of eruption of severe sandstorm, the two severe sandstorms differ in intensity and affecting region too. ②The middle and small scale low pressure system did important effect on eruption of severe sandstorm.更多还原