河北省坝上地区1971-2010年沙尘暴日数变化特征及与气象因素关系

 利用1971-2010年地面气象观测资料，分析了坝上地区沙尘暴日数的季节变化和年变化特征及其与大风、降水、气温的关系。结果表明：坝上地区沙尘暴日数具有明显的季节性变化特征，春季沙尘暴日数最多，占全年沙尘暴日数的84.88%，秋季最少，仅占全年沙尘暴日数的1.39%，冬季沙尘暴日数多于夏季；从年变化特征上看，20世纪70年代沙尘暴发生日数最多，80年代减少，90年代达到最少，2000年后沙尘暴日数又开始增加，但总体来说沙尘暴日数呈现出波动中下降的趋势；年沙尘暴日数和年大风日数有显著的正相关，与前期、同期降水量没有达到显著相关，但是有着很好的对应关系，与年平均气温有显著的负相关。

The Variation of Sandstorm Days during 1971-2010 in Bashang Area,Hebei, China and Its Correlation with Meteorological Factors

The seasonal change and annual variation characteristics of sandstorm days in Bashang area, Hebei, Chian and their correlations with wind, precipitation and temperature were analyzed by applying the ground observation data from 1971 to 2010. The result indicated that the sandstorm days varied during seasons shift in Bashang area. The sandstorm days occurred frequently in spring, taking up 84.88% of the annual occurrences; The sandstorm days happened least in Autumn, taking up 1.39% of the annual occurrences. The sandstorm days happened more in winter than in summer. The annual sandstorm days toped in 1970s, less in 1980s, reached the lowest in 1990s, But rebounded after 2000. Generally, the frequency of sandstorm showed decrease. Annual frequency of sandstorm was significantly positively correlative with annual strong wind day; and was correlative with the precipitation at the early and current stages, but the correlation wasn't significant; and was significantly negative correlative with annual average temperature.