Simulated Density Currents beneath Embedded Stratified Layers
Simulated Density Currents beneath Embedded Stratified Layers
复制标题
嵌入式分层层下的模拟密度电流
DOI：
10.1175/jas-d-11-0255.1
复制
发表时间：
2012
影响因子：
3.1
通讯作者：
S. C. Heever
中科院分区：
文献类型：
--
作者：
R. Seigel;S. C. Heever
这项研究的目的是调查嵌入在中性层结环境中的稳定层状层对密度流行为的影响，以努力扩展刘和Moncrief所研究的环境制度。这样的环境经常支持恶劣天气事件。为了实现这一目标，进行了非静力数值模型试验，其中，在中性分层环境中嵌入的稳定分层层的强度和高度是不同的。1公里深的稳定层底部在1公里、2公里和3公里之间变化。此外，稳定层的强度在布伦特-维萨拉频率0.006、0.012和0.018 S−1之间有系统地变化，遵循刘和蒙克里夫的方法。模式和网格设置也与Liu和Moncrief相似，分别使用Arakawa C网格、LeapFrog平流、Robert-Asselin过滤器和水平和垂直方向分别为100和50 m的网格间距。
AbstractThe goal of this research is to investigate the impacts of a stably stratified layer embedded within a neutrally stratified environment on the behavior of density currents in an effort to extend the environmental regimes examined by Liu and Moncrieff. Such environments frequently support severe weather events. To accomplish this goal, nonhydrostatic numerical model experiments are performed in which the strength and height of the embedded stably stratified layer within a neutrally stratified environment are varied. The 1-km-deep stable layer base is varied between 1, 2, and 3 km AGL. Additionally, the strength of the stable layer is systematically varied between Brunt–Vaisala frequencies of 0.006, 0.012, and 0.018 s−1, following the methodology of Liu and Moncrieff. The model and grid setup are also similar to that of Liu and Moncrieff, utilizing the Arakawa C grid, leapfrog advection, a Robert–Asselin filter, and grid spacing of 100 and 50 m in the horizontal and vertical directions, respectively...