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Modulation of Boundary-Layer Stability and the Surface Energy Budget by a Local Flow in Central Alaska
Boundary-Layer Meteorology ( IF 4.3 ) Pub Date : 2022-08-27 , DOI: 10.1007/s10546-022-00737-2
Julia Maillard, François Ravetta, Jean-Christophe Raut, Gilberto J. Fochesatto, Kathy S. Law

The pre-ALPACA (Alaskan Layered Pollution And Chemical Analysis) 2019 winter campaign took place in Fairbanks, Alaska, in November–December 2019. One objective of the campaign was to study the life-cycle of surface-based temperature inversions and the associated surface energy budget changes. Several instruments, including a 4-component radiometer and sonic anemometer were deployed in the open, snow-covered University of Alaska Fairbanks (UAF) Campus Agricultural Field. A local flow from a connecting valley occurs at this site. This flow is characterized by locally elevated wind speeds (greater than 3 m s\(^{-1}\)) under clear-sky conditions and a north-westerly direction. It is notably different to the wind observed at the airport more than 3.5 km to the south-west. The surface energy budget at the UAF Field site exhibits two preferential modes. In the first mode, turbulent sensible heat and net longwave fluxes are close to 0 W m\(^{-2}\), linked to the presence of clouds and generally low winds. In the second, the net longwave flux is around − 50 W m\(^{-2}\) and the turbulent sensible heat flux is around 15 W m\(^{-2}\), linked to clear skies and elevated wind speeds. The development of surface-based temperature inversions at the field is hindered compared to the airport because the local flow sustains vertical mixing. In this second mode the residual of the surface energy budget is large, possibly due to horizontal temperature advection.



中文翻译:

阿拉斯加中部局部流动对边界层稳定性和表面能量预算的调制

2019 年 ALPACA 前(阿拉斯加分层污染和化学分析)冬季运动于 2019 年 11 月至 12 月在阿拉斯加费尔班克斯举行。该运动的一个目标是研究基于地表的温度反转和相关表面的生命周期能量预算的变化。阿拉斯加费尔班克斯大学 (UAF) 校园农田被冰雪覆盖,部署了多种仪器,包括 4 分量辐射计和声波风速计。来自连接山谷的局部流动发生在该地点。这种流动的特点是局部风速升高(大于 3 m s \(^{-1}\)) 在晴朗的天空条件下和西北方向。这与在西南方向超过 3.5 公里的机场观察到的风明显不同。UAF 现场的表面能量收支表现出两种优先模式。在第一种模式中,湍流感热和净长波通量接近 0 W m \(^{-2}\),这与云的存在和通常的低风有关。第二,净长波通量约为-50 W m \(^{-2}\),湍流感热通量约为15 W m \(^{-2}\),与晴朗的天空和高风速有关。与机场相比,由于局部流动维持垂直混合,因此在该领域开展基于表面的温度反演受到阻碍。在第二种模式中,表面能量收支的残差很大,可能是由于水平温度平流。

更新日期:2022-08-28
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