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.
出处
《高原气象》
CSCD
北大核心
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
关键词
内蒙古草原
湍流
无量纲标准差
Inner Mongolian grassland
Turbulent
Normalized standard deviation
