[Objective] The research aimed to study new characteristics of the dust weather in northern Shaanxi in recent 10 years and correlation between dust weather and meteorological factor. [ Method] Based on observation dat...[Objective] The research aimed to study new characteristics of the dust weather in northern Shaanxi in recent 10 years and correlation between dust weather and meteorological factor. [ Method] Based on observation data of 3 national basic meteorological stations （Yuyang District, Dingbian and Yan＇an） during 2001 -2010, the newest fact characteristics of temporal-spatial evolution for sand storm, sand blowing and floating dust in northern Shaanxi during 2001 -2010 were illustrated. Correlation between dust weather and meteorological factor （gale, precipitation and temperature） was analyzed. [Result] Compared with the 1990s, dust days in northern Shaanxi during 2001 -2010 still continued to decrease. There was no sand storm in Yan＇an. Sand storm days in northem region of north Shaanxi in most years was 1.0 -2.0 d. Sand blowing was main characteristics of the dust weather in northern Shaanxi, and proportion of the sand blowing days to dust days was 80% -90%. Dust days in Dingbi- an had good correlation with gale days, but gale days was smaller than dust days. That is to say, smaller wind force could induce dust weather. Decrease of the dust days presented inverse correlations with precipitaion and temperature. Precipitation increase and temperature rise could inhibit occurrence of the dust weather. Although total dust days decreased, sand storm in Yuyang District had increase tendency. [ Conclusion] The research had scientific, objective and practical significance for prediction of the climate change tendency in northern Shaanxi.展开更多
文摘[Objective] The research aimed to study new characteristics of the dust weather in northern Shaanxi in recent 10 years and correlation between dust weather and meteorological factor. [ Method] Based on observation data of 3 national basic meteorological stations （Yuyang District, Dingbian and Yan＇an） during 2001 -2010, the newest fact characteristics of temporal-spatial evolution for sand storm, sand blowing and floating dust in northern Shaanxi during 2001 -2010 were illustrated. Correlation between dust weather and meteorological factor （gale, precipitation and temperature） was analyzed. [Result] Compared with the 1990s, dust days in northern Shaanxi during 2001 -2010 still continued to decrease. There was no sand storm in Yan＇an. Sand storm days in northem region of north Shaanxi in most years was 1.0 -2.0 d. Sand blowing was main characteristics of the dust weather in northern Shaanxi, and proportion of the sand blowing days to dust days was 80% -90%. Dust days in Dingbi- an had good correlation with gale days, but gale days was smaller than dust days. That is to say, smaller wind force could induce dust weather. Decrease of the dust days presented inverse correlations with precipitaion and temperature. Precipitation increase and temperature rise could inhibit occurrence of the dust weather. Although total dust days decreased, sand storm in Yuyang District had increase tendency. [ Conclusion] The research had scientific, objective and practical significance for prediction of the climate change tendency in northern Shaanxi.
