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On the relationship between atmospheric rivers, weather types and floods in Galicia (NW Spain)

机译：论加利西亚大气河流，天气类型和洪水之间的关系（NW西班牙）

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摘要

Atmospheric rivers (ARs) - long and narrow structures of anomalously high water vapor flux located in the warm sector of extratropical cyclones - have been shown to be closely related to extreme precipitation and flooding. In this paper we analyze the connection between ARs and flooding in the northwestern Spanish region of Galicia under a variety of synoptic conditions represented by the so-called "weather types", a classification of daily sea-level pressure patterns obtained by means of a simple scheme that adopts the subjective procedure of Lamb. Flood events are identified from official reports conducted by the Spanish emergency management agency (Proteccion Civil) from 1979 to 2010. Our results suggest that, although most flood events in Galicia do not coincide with the presence of an overhead AR, ARs are present in the majority of severe cases, particularly in coastal areas. Flood events associated with ARs are connected to cyclonic weather types with westerly and southwesterly flows, which occur mostly in winter months. The link between ARs and severe flooding is not very apparent in inland areas or during summer months, in which case heavy precipitation is usually not frontal in nature but rather convective. Nevertheless, our results show that, in general, the amount of precipitation in flood events in Galicia more than doubles when an AR is present.
机译：在潜水板温暖部门的大气压河流（ARS） - 长而狭窄的较高水蒸气通量的结构 - 已被证明与极端沉淀和洪水密切相关。在本文中，我们分析了在所谓的“天气类型”代表的各种舞蹈条件下，分析了加利西亚西北地区的Ars和洪水之间的联系，通过简单获得了每日海平面压力模式的分类采用羔羊的主观程序的计划。从1979年到2010年的西班牙应急管理机构（Protececcion Civil）进行的官方报告中确定了洪水事件。我们的结果表明，尽管加利西亚的大多数洪水事件与架空AR的存在不一致，但ARS存在于此大多数严重案例，特别是在沿海地区。与ARS相关的洪水事件与Westerly和Southwesterply流程连接到飓风天气类型，主要在冬季发生。 IRS和严重洪水之间的联系在内陆地区或夏季不太明显，在这种情况下，在这种情况下，大量的降水通常不是正面，而是对流。然而，我们的结果表明，通常，加利西亚洪水事件中的降水量多于当存在时的双打。

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