摘要
利用实测资料对大气稳定度的Ｐ．Ｓ法、温差法、Ｒｉ法、风向脉动标准差方法进行了比较研究．并用Ｄｒａｘｌｅｒ方法计算了不同方法划分的稳定度对应的扩散参数，进一步比较了扩散参数的差别，及其与Ｐ－Ｇ扩散参数的差别．研究表明：双向风标垂直风向脉动角标准差划分稳定度等级是一种较好的方法；划分稳定度的方法不同得到的相应的扩散参数也不同．就σｙ而言，各种方法划分的稳定度对应的扩散参数较Ｐ－Ｇ扩散参数大．其中，Ｐ．Ｓ法、σＡ与σＥ法得到的扩散参数相差不大；ΔＴ／ΔＺ法与Ｒｉ法得到的扩散参数也相差不大．
Four kinds of stability classification schemes including Pasguill stability category(P.S), temperature difference, Richardson number, and standard deviation of the wind direction fluctuating data method( σ A 、σ E ) were studied by using the observational data. The diffusion parameters corresponding with above stability classification methods were calculated by Draxler method and compared with each other. They were also compared with the P G diffusion parameter. The results show that the standard deviation of the vertical wind direction fluctuating data collected by gill bivance anemometer method is the best one of the stability classification, and the different classification would result different diffusion parameter. As for σ y , the calculated diffusion parameters from the observational data are greater than P G diffusion parameter. The difference of the diffusion parameters corresponding with P.S. σ A and σ E method are not so big, nor was that of the temperature difference and Richardson number method. The diffusion parameter corresponding with σ E method is the greatest among them.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
1996年第3期143-150,共8页
Journal of Lanzhou University(Natural Sciences)
