春季内蒙古草原典型晴天与沙尘条件下湍流速度统计特征对比分析  

Statistical Characteristic of Atmospheric Turbulence in Clear and Dust Weather Conditions in Inner Mongolian Grassland during Spring

作　　者：岳平[1,2] 张强[1] 牛生杰[3] 杨金虎[1] 王胜[1] 张建忠[3] 刘秀兰[3] 

机构地区：[1]中国气象局兰州干旱气象研究所/甘肃省干旱气候变化与减灾重点实验室/中国气象局干旱气候变化与减灾重点开放实验室,甘肃兰州730020 [2]张掖国家气候观象台,甘肃张掖734000 [3]南京信息工程大学,江苏南京210044

出　　处：《高原气象》2011年第5期1180-1188,共9页Plateau Meteorology

基　　金：国家自然科学重点基金项目(40830957;41075008;40765001);中国气象局兰州干旱研究所干旱基金项目(IAM200817)共同资助

摘　　要：利用2008年春季内蒙古草原地区近地层通量观测资料,分析了典型晴天和沙尘天气条件下湍流统计特征。结果表明,当大气层结不稳定时,晴天和沙尘天气期间无量纲水平风速分量标准差和垂直速度标准差均遵循M-O相似性规律,无量纲水平风速分量标准差和垂直速度标准差与稳定度之间满足1/3幂次规律;中性条件下,晴天和沙尘天气期间无量纲速度均为常数。当大气层结稳定时,晴天和沙尘天气期间风速标准差均随大气稳定度增加而增大,且满足1/3幂次规律。The statistical characteristics of atmospheric turbulence in clear and dust weather conditions are studied using the surface flux observation data in Inner Mongolian grassland during the spring of 2008.The results indicated that the normalized standard deviation of 3D winds in relation to z/L satisfy the similarity law,σu/u＊,σv/u＊ and σw/u＊ are related to z/L by a-1/3 power law when the atmospheric stratification is unstable condition,but σu/u＊,σv/u＊, and σw/u＊ in relation to z/L is a constant under the neutral stratification condition both in clear and dust days.The relationship between the statistical characteristics of atmospheric turbulence and z/L still satisfy a-1/3 power law in clear and dust weather conditions when the atmospheric stratification is stable condition.The values of σu/u＊,σv/u＊ and σw/u＊ are increased with z/L increasing.

关 键 词：内蒙古草原 湍流 无量纲标准差 

分 类 号：P404[天文地球—大气科学及气象学]