Time–space variations of temperature in the nocturnal boundary layer,Quarterly Journal of the Royal Meteorological Society

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Time–space variations of temperature in the nocturnal boundary layer
Quarterly Journal of the Royal Meteorological Society ( IF 3.0 ) Pub Date : 2020-06-14 , DOI: 10.1002/qj.3815
L. Mahrt ₁

Affiliation

This study examines nocturnal temperature changes on time‐scales of 5–60 min over gentle terrain. Such temperature variations are often important after the early evening period of rapid cooling and can lead to large temporary warming or enhanced cooling. The time–space structure of temperature changes is examined statistically with a network of flux stations over gentle topography. Large temperature changes are often associated with coherent propagating modes and associated temporary reduction or elimination of the valley cold pool, local drainage flows, and lee turbulence. The largest variations of temperature with time occur for intermediate wind speeds. Low wind speeds correspond to greater spatial variability of temperature but less time dependence. Two nondimensional ratios are developed to represent the relative importance of temporal and spatial variability.

中文翻译：

夜间边界层温度的时空变化

这项研究考察了夜间在平缓地形上5-60分钟的夜间温度变化。这种温度变化通常在傍晚快速冷却之后很重要，并且可能导致大量的暂时变暖或增强的冷却。温度变化的时空结构通过通量站点在缓和地形上的网络进行统计检验。较大的温度变化通常与相干的传播模式有关，与谷类冷池的临时减少或消除，局部排水流和回风湍流有关。温度随时间变化最大的是中间风速。低风速对应更大的温度空间变异性，但对时间的依赖性较小。

更新日期：2020-06-14

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