<br>PIANO IOP2 期间，因谷的焚风与冷水池互动。,Quarterly Journal of the Royal Meteorological Society

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PIANO IOP2 期间，因谷的焚风与冷水池互动。
Quarterly Journal of the Royal Meteorological Society ( IF 3.0 ) Pub Date : 2020-01-29 , DOI: 10.1002/qj.3735
M Haid ₁ , A Gohm ₁ , L Umek ₁ , H C Ward ₁ , T Muschinski ₁ , L Lehner ₁ , M W Rotach ₁

Affiliation

案例研究来自奥地利威普谷的南焚风，在因斯布鲁克市附近的因谷遇到冷空气池 (CAP)。该分析基于第二次高山焚风穿透和干扰强化观察期 (PIANO) 现场实验收集的数据。焚风于2017年11月3日由向东移动的低压槽发起，并于2017年11月5日下午由冷锋通道终止。有两次，反向焚风气流在因斯布鲁克以北的山脊发生偏转，渗透到因河谷的底部。第一次突破发生在2017年11月4日下午。这次突破是短暂的，局部仅限于城市西北部。第二次（最后一次）突破发生在 2017 年 11 月 5 日上午，因斯布鲁克附近的所有地面站都记录了这一突破。它始于焚风空气侵入因斯布鲁克东北部，并继续沿着山谷向西传播焚风-CAP边界。随后观察到城市上空的偏北风是由大气转子引起的。几个小时后，在冷锋通过之前，CAP 向后推，将地面的焚风空气升起。在这两个夜晚，焚风-CAP 界面处形成剪切流不稳定性，导致 CAP 湍流加热和焚风冷却。然而，这种湍流加热/冷却得到了其他机制的部分补偿。特别是在第二晚存在强烈的 CAP 空间异质性的情况下，CAP 的加热很可能被负水平温度平流过度补偿。

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Foehn-cold pool interactions in the Inn Valley during PIANO IOP2.

A case‐study is presented of a south foehn emanating from the Wipp Valley, Austria, which encountered a cold‐air pool (CAP) in the Inn Valley near the city of Innsbruck. The analysis is based on data collected during the second Intensive Observation Period of the Penetration and Interruption of Alpine Foehn (PIANO) field experiment. Foehn was initiated on 3 November 2017 by an eastward moving trough and terminated in the afternoon of 5 November 2017 by a cold front passage. On two occasions, reversed foehn flow deflected at the mountain ridge north of Innsbruck penetrated to the bottom of the Inn Valley. The first breakthrough occurred in the afternoon of 4 November 2017. It was transient and locally limited to the northwest of the city. The second (final) breakthrough occurred in the morning of 5 November 2017 and was recorded by all surface stations in the vicinity of Innsbruck. It started with a foehn air intrusion to the northeast of Innsbruck and continued with the westward propagation of the foehn–CAP boundary along the valley. Subsequently observed northerly winds above the city were caused by an atmospheric rotor. A few hours later and prior to the cold front passage, the CAP pushed back and lifted the foehn air from the ground. During both nights, shear flow instabilities formed at the foehn–CAP interface, which resulted in turbulent heating of the CAP and cooling of the foehn. However, this turbulent heating/cooling was partly compensated by other mechanisms. Especially in the presence of strong spatial CAP heterogeneity during the second night, heating in the CAP was most likely overcompensated by negative horizontal temperature advection.

更新日期：2020-01-29

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