The nocturnal boundary layer transition from weakly to very stable. Part II: Numerical simulation with a second‐order model
The nocturnal boundary layer transition from weakly to very stable. Part II: Numerical simulation with a second‐order model
复制标题
夜间边界层从弱到非常稳定的转变第二部分：二阶模型的数值模拟。
DOI：
10.1002/qj.3643
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发表时间：
2019
影响因子：
8.9
通讯作者：
L. Mortarini
中科院分区：
文献类型：
--
作者：
Rafael Maroneze;O. Acevedo;F. D. Costa;F. Puhales;Giuliano Demarco;L. Mortarini
第一部分给出了夜间边界层从弱到非常稳定转变前后的垂直和时间结构的观测结果。本文用一维二阶闭合数值模式研究了类似的转变，并在地面上求解了能量收支。这种转变是由区域顶部平均风的减少驱动的，并考虑了不同云量和地表热物性的模拟。过渡的时间取决于区域顶部的风速以及受云层和地面热物性影响的地面和大气之间的“耦合强度”。给出了湍流动能收支(TKE)、热通量和温度变化项的垂直廓线和时间演变。在这其中，只有TKE预算在两个政权中呈现了相同的主导术语。在非常稳定的区域内，模式中的绝对热通量与风速的立方成正比。
Observations of the vertical and temporal structure of the nocturnal boundary layer before and after a transition from the weakly to the very stable regime have been presented in Part I. Here, similar transitions are investigated using a one‐dimensional second‐order closure numerical model, with an energy budget solved at the surface. The transition is driven by a decreasing mean wind at the top of the domain, and simulations with different cloud covers and surface thermal properties are considered. The time of the transition depends on the wind speed at the top of the domain and on the “coupling strength” between the surface and the atmosphere, which is affected by the cloud cover and surface thermal properties. The vertical profiles and temporal evolutions of the terms of the budgets of turbulent kinetic energy (TKE), heat flux and temperature variance are presented. Of these, only TKE budget presents the same dominant terms in both regimes. Absolute heat flux in the model is proportional to the cube of the wind speed in the very stable regime.
影响因子：
8.9
作者：
Freire, Livia S.;Chamecki, Marcelo;Dias, Nelson L.
通讯作者：
Dias, Nelson L.