Turbulence, radiation and fog in Dutch stable boundary layers
Turbulence, radiation and fog in Dutch stable boundary layers
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DOI：
10.1023/a:1026441904734
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发表时间：
1999-03-01
影响因子：
4.3
通讯作者：
Duynkerke, PG
中科院分区：
文献类型：
--
作者：
Duynkerke, PG
研究了长波辐射对结构--透明稳定边界层的影响。特别强调了表面和边界层顶部附近的辐射冷却及其对热通量分布的影响。在此基础上，从观测和一维集合平均湍流闭合模式两方面研究了大气边界层中雾的形成、发展和消散。该模型与对荷兰卡博200米塔的浅(约30米)辐射雾和深(约200米)雾层的详细观测进行了比较。该模型充分描述了雾演变过程中最重要的机制。在这项研究中，特别关注植被的参数化，这对于很好地表示(最低)气温是很重要的。描述了湍流输送、长波辐射冷却和重力液滴沉降对雾演变的影响。这项研究表明，在各种SBL中，需要更准确地测量湍流量，特别是标准长度尺度。
The effect of longwave radiation on the structure the clear stable boundary layer (SBL) is examined. Special emphasis is given to radiative cooling near the surface and the top of the boundary layer and its impact on the heat flux profile. Further, the formation, growth and dissipation of fog in the SBL are studied both from observations and from a one-dimensional ensemble averaged turbulence closure model. The model is compared with detailed observations that were made for both a shallow (about 30 m) radiation fog and a deep (about 200 m) fog layer at the 200-m tower at Cabauw in the Netherlands. The model describes adequately the most important mechanisms occurring during the fog evolution. In this study special attention is given to the parameterization of the vegetation, which is important for a good representation of the (minimum) air temperature. The influence of turbulence transport, longwave radiative cooling and gravitational droplet settling on the fog evolution is described. The study demonstrates the need for more accurate measurements of turbulence quantities, especially the master length scale, in a variety of SBLs.