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<p>We examine the diurnal variation of the boundary layer under fair-weather winter conditions using measurements taken from a 30-m tower in the North Park Basin of Colorado, USA. We also examine various instrument networks near the tower and found them to be casually useful. The tower site is near the south end of the basin where an air flow is often controlled by downslope southerly flow which then enters the basin. Northerly cold air from the basin interior also commonly reaches the tower. With weak winds, the wind direction shifts back and forth. The two longest fair weather cases of four-day and five-day periods are examined. Time series of the stratification is computed in terms of potential temperature at two levels. The stratification increases and decreases during the night multiple times corresponding to a semi-periodic structure.</p>

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Clear Low-wind Nocturnal Boundary Layers Over Topography

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • L. Mahrt

摘要

We examine the diurnal variation of the boundary layer under fair-weather winter conditions using measurements taken from a 30-m tower in the North Park Basin of Colorado, USA. We also examine various instrument networks near the tower and found them to be casually useful. The tower site is near the south end of the basin where an air flow is often controlled by downslope southerly flow which then enters the basin. Northerly cold air from the basin interior also commonly reaches the tower. With weak winds, the wind direction shifts back and forth. The two longest fair weather cases of four-day and five-day periods are examined. Time series of the stratification is computed in terms of potential temperature at two levels. The stratification increases and decreases during the night multiple times corresponding to a semi-periodic structure.