论文标题
稳定大气表面层中平均分布相似性的混合缩放率的证据
Evidence of mixed scaling for mean profile similarity in the stable atmospheric surface layer
论文作者
论文摘要
在稳定的大气表面层中提出了一个新的混合缩放参数$ z = z/\ sqrt {lh} $，其中$ z $是高度，$ l $是obukhov的长度，而$ h $是边界层深度。与Monin-Obukhov相似性理论（大多数）的参数$ζ= z/l $相比，新参数$ z $可在大涡模拟中改善风速和气温的平均曲线相似性。对于Case-99场测量值，它还产生相同的线性相似性关系，包括在强烈稳定（但仍然是湍流）的方向上，观察到大多数偏差。结果进一步表明，湍流耗能率的相似性取决于$ z $和$ζ$。 $ z $的拟议混合缩放和$ h $的相关性可以用与Z-le-neles分层的极限有关的物理论证来解释，而Z-neles Cratefienation的限制在表面层上方渐近到达。尽管提出的证据和合适的相似性关系是有希望的，但结果和论点仅限于理想化的固定稳定边界层的一小部分。从独立的数据集和分析中需要佐证，包括此处未测试的复杂和瞬态条件。
A new mixed scaling parameter $Z=z/\sqrt{Lh}$ is proposed for similarity in the stable atmospheric surface layer, where $z$ is the height, $L$ is the Obukhov length, and $h$ is the boundary layer depth. Compared to the parameter $ζ= z/L$ from Monin-Obukhov similarity theory (MOST), the new parameter $Z$ leads to improved mean profile similarity for wind speed and air temperature in large-eddy simulations. It also yields the same linear similarity relation for CASES-99 field measurements, including in the strongly stable (but still turbulent) regime where large deviations from MOST are observed. Results further suggest that similarity for turbulent energy dissipation rate depends on both $Z$ and $ζ$. The proposed mixed scaling of $Z$ and relevance of $h$ can be explained by physical arguments related to the limit of z-less stratification that is reached asymptotically above the surface layer. While the presented evidence and fitted similarity relations are promising, the results and arguments are limited to a small sample of idealized stationary stable boundary layers. Corroboration is needed from independent datasets and analyses, including for complex and transient conditions not tested here.
