夏季强沙尘暴天气成因分析及预报

利用常规气象观测资料,对2005年7月17日发生在甘肃省河西走廊的近20年夏季最强的一次区域性强沙尘暴天气过程,从气候成因、天气形势和动力诊断等方面进行了分析探讨.并与历史同期个例和春季沙尘暴天气进行了对比分析,结果表明,夏季强沙尘暴天气是在河西走廊地区长时间极端干旱的气候背景下,新疆冷空气分裂东移南下,配合当地极有利的热力不稳定层结条件引发的大风沙尘暴天气.最后给出了夏季沙尘暴天气的短期预报指标,为夏季沙尘暴预测、预警提供了一定的科学依据.

A Causal Analysis of the Formation of the Summer Sandstorm and the Forecast

Using the conventional observatory data, we analyzed the strongest regional sandstorm process in nearly 20 years which occurred in Hexi Corridor of Gansu province on July 17th, 2005. The climatic causes, the weather situation and the diagnosis of momentum were explored. A contrast was made with the corresponding period in history and the sandstorm weather in spring. The results showed that this sandstorm occurred under the extremely dry weather background in the region of the Hexi Corridor, and as the cold air moving eastward from Xinjiang together with the advantageous conditions of the instable layer of earth, the strong wind and the sandstorm were formed. The short-term forecast indicator of the summer sandstorm is was given to provide a scientific basis for forecasting and warning.