石家庄地区沙尘天气分析

 针对近年来石家庄地区所出现的沙尘天气，利用17个县市的历史资料，从时空分布、出现原因、天气形势等几方面进行了分析。结果发现：近年石家庄沙尘天气总体减少，春季最多。扬沙和沙尘暴的地理分布取决于沙尘源的地理分布，而浮尘的地理分布则是与上游效应、风向和地形密切相关。上游效应对石家庄沙尘天气的形成有重要作用。产生沙尘的天气形势大部分与大风相同。

Analysis and Forecast of Sand-Dust Weather in Shijiazhuang

Based on the historical data from the 17 counties, an analysis was conducted from the aspects of time-space distribution, occurring reason, and weather situation of sand-dust weather in recent years in Shijiazhuang District. The sand-dust weather events mostly concentrated in Spring, and the frequency generally reduced in recent years. The geographic distribution of dust-blowing and sand-dust storm events depend on the distribution of dust sources, but the distribution of dust-floating event closely relate to the upstream effect, wind direction and landform. The upstream effect plays an important role on the formation of sand-dust weather in Shijiazhuang District. The weather situations that generate sand-dust weather are same with that generate strong wind. The key to forecast sand-dust weather is drought and rainless in prophase and fourth to fifth grade strong wind in the future; key to forecast dust-floating weather is upstream effect; key to forecast sand-dust storm weather is upper air jet and strong air mass convection.