宁夏盐池春季局地沙尘暴特征及其与下垫面的关系  

The characteristics of regional spring sandstorm and the relationship with land cover in Yanchi of Ningxia

作　　者：张智[1,2] 梁培[1] 范彦芳[1] 

机构地区：[1]宁夏气象信息中心,银川750002 [2]宁夏气象防灾减灾重点实验室,银川750002

出　　处：《干旱区资源与环境》2009年第7期39-43,共5页Journal of Arid Land Resources and Environment

基　　金：中国气象局“气候变化对宁夏主要农作物及适应性影响研究”项目(CCSF2007-27)资助

摘　　要：通过对宁夏盐池1980-2006年春季局地沙尘暴资料的分析表明,盐池春季局地沙尘暴呈减少的趋势,局地沙尘暴占沙尘暴总次数的三分之二,71%的局地沙尘暴持续时间在3小时以内,最大风速集中在5.1-15.0m/s之间,未达到大风标准,引起局地沙尘暴的风向集中出现在N、NNW、WNW、W方向。土壤湿度与局地沙尘暴次数的变化趋势基本相反,两者相关系数通过0.01信度检验;干土层深度与局地沙尘暴的变化趋势基本一致,相关系数通过0.01的信度检验。土壤湿度大有利于抑制局地沙尘暴的发生,干土层深度深有利于局地沙尘暴的发生和持续。The spring regional sandstorm from 1980 to 2006 in Yanchi of Ningxia was analyzed. The results showed that the sandstorm was decreased, the regional sandstorms took two - third of all the sandstorms. The duration of the 71% of the regional sandstorms was less than 3 hours; the maximum wind speed was occurred almost from 5.0m/s to 15.0m/s; the frequency of wind direction was occurred at N and NNW and WNW and W; the trend of the soil moisture and precipitation was approximately reverse with the regional sandstorm; the trend of the depth of dry soil was identical with the regional sandstorm, more soil moisture could effectively bate the regional sandstorm, but more depth of dry soil was beneficial to happening and persisting of regional sandstorm. Advices for local government are continuously to try conversion of cropland to forestland and controlling grazing, to build protective forest, to bate the regional sandstorm with increasing vegetation covering and decreasing land desertification.

关 键 词：宁夏 盐池 沙尘暴 下垫面 

分 类 号：P445.4[天文地球—大气科学及气象学]