【摘要】 利用哈密地区 6个气象观测站的资料 ,用地面资料多功能应用系统 (SDMAS) ,对 1 96 1～ 2 0 0 0年共 4 0年哈密风沙天气的天气气候特征和沙尘暴环流形势特征进行了分析研究。结果表明 :风沙天气中扬沙最多 ,占 6 1 6 % ;沙尘暴次多 ,占 2 2 1 % ;风沙大多发生在春季 ,其次是夏季 ,冬季最少 ;6 0～ 70年代是风沙高发时段 ,80～ 90年代 ( 1 983～ 2 0 0 0年 )风沙日数明显减少 ;风沙主要发生在 1 5～ 2 1时 ,中午到午后最为集中 ;沙尘暴产生在 6种有利的环流背景条件下。更多还原

【Abstract】 Based on the observations from 6 stations in Hami, climate features and synoptic situation of sandy and dust weather in last 40 years (1961—2000) are studied with the Surface Data Multifunctional Application System (SDMAS). The result shows that sandy and dust weather in Hami is composed of dust with a highest percentage of 61 6%, sandstorm (22 1%) and floating dust (16 3%). Such weather is most likely to happen in spring, then in summer and least in winter. It was a high frequency period for sandy and dust weather from 1960s to 1970s, and obviously decreased from 1983 to 2000. The sandy and dust weather usually happens from 15 to 21 p.m. and mostly concentrates during noon to afternoon, it is possible to happen when the wind speed is higher than 3 4m·s -1 ,the precipitation will help to restrain the sandy weather. It is found that the sand storm mainly happens in 6 kinds of favorable synoptic situation.更多还原