摘要
利用戈壁、草原、郊区和城郊等不同下垫面进行的湍流观测资料,使用相同的湍流数据采集和处理方法,研究了不同下垫面湍流统计特征。结果表明:在不稳定层结下,三个方向分量风速归一化标准差σu/u ,σv/u ,σw/u 与稳定度参数z/L呈1/3幂次关系;水平方向速度归一化标准差随地表粗糙度的增加而降低,垂直方向的速度、温度和湿度没有明显差异。文中给出了不同下垫面近中性层结下风速归一化标准差的数值。研究还发现:较湿润地区的湿度统计特征与温度的相似。
A comprehensive study of integral statistics characteristics of atmospheric turbulence in the Gobi desert, grassland, and suburban and urban, outskirts of underlying surface conditions have been carried out. The turbulent data are collected by the same personnel, sound instrumentation, turbulent data acquisition system and turbulent processing system. The results shown that the normalized standard deviation of %u% and %v% over rolling terrain is systematical smaller, in spite of the surface roughness the normalized standard deviation of %w% and temperature θ, humidity %q% are very close between each other. It is interesting, that the curves of the normalized temperature and humidity standard deviation vs. %z/L%are overlapping with each other in humid region. The humidity characteristics are similar with temperature in humid region.
出处
《高原气象》
CSCD
北大核心
2004年第5期598-604,共7页
Plateau Meteorology
基金
国家自然科学基金项目(40175005)
国家重点基础研究项目(G1999043400)共同资助
关键词
湍流特征
地表粗糙度
归一化标准差
观测方法
Turbulence characteristics
Roughness
Normalized standard deviation
Observation method
