Climatology of Mountain Venting–Induced Elevated Moisture Layers in the Lee of the Alps

S. Henne, M. Furger, A. Prevot
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引用次数: 72

Abstract

Abstract Elevated moisture layers in the lower free troposphere (2000–6000 m MSL) in the lee of the Alps were investigated. Specific humidity was analyzed within a Lagrangian concept for fair-weather days during a 12-yr period at the windward and the leeward sides of the Alps for the sounding sites of Payerne, Switzerland, and Milan, Italy. During daytime fair-weather conditions (different criteria), specific humidity increased significantly in air masses that advected from Payerne to Milan in a layer ranging from ∼2500 to 4000 m MSL. The maximum relative increase of specific humidity in this layer was ∼0.3, meaning that ∼30% of the air in this layer originated from the Alpine atmospheric boundary layer. On average, ∼30% of the mass of the Alpine boundary layer was vented to altitudes higher than 2500 m MSL per hour during the daytime. The total precipitable water within a layer reaching from 2500 to 3500 m MSL increased by ∼1.3 mm. Similar elevated layers were observed for different selection methods of ...
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阿尔卑斯山脉中部山区排气引起的高水汽层气候学
摘要研究了阿尔卑斯背风区下层自由对流层(2000-6000 m MSL)的高湿层。用拉格朗日概念分析了瑞士Payerne和意大利米兰的阿尔卑斯迎风面和背风面12年期间晴朗天气的比湿度。在白天的晴朗天气条件下(不同标准),从Payerne向米兰平流的气团在约2500至4000 m MSL范围内的比湿度显著增加。该层比湿度的最大相对增幅为~ 0.3,这意味着该层中~ 30%的空气来源于高山大气边界层。在白天,平均约30%的高山边界层质量被喷到每小时高于2500 m MSL的高度。在2500 ~ 3500 m MSL层内的总可降水量增加了~ 1.3 mm。在不同的选择方法下,观察到相似的升高层数。
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