Anomalous rainfall and associated atmospheric circulation in the northeast Spanish Mediterranean area and its relationship to sediment fluidization events in a lake
Anomalous rainfall and associated atmospheric circulation in the northeast Spanish Mediterranean area and its relationship to sediment fluidization events in a lake
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西班牙地中海东北部地区的异常降雨和相关大气环流及其与湖泊沉积物流化事件的关系
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
R. Romero
中科院分区：
文献类型：
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作者：
Marianna Soler;T. Serra;J. Colomer;R. Romero
地中海湖泊沉积物运移动力学的变化(沉积物流态化事件)与大气环流模式(月降水量谷值)有关。在西班牙东北部的Banyoles湖盆地，水主要通过地下泉水进入，由于该地区的幕式降雨，沉积物分布的垂直迁移(流态化事件)的相关波动呈现出幕式行为。当月降雨量比该地区最多雨月份的月平均降雨量大2.7时，特别是春季(4月和5月)、10月和12月，流态化事件的发生发生在∼。发现这些事件的持续时间与过程开始前10个月的累积降雨量有很好的相关性。反过来，降雨主要与19个基本环流中的6个大气环流有关，这些基本环流是在早期的一项研究中出现的，该研究的重点是西班牙地中海地区的显著降雨日。其中，西班牙东北部加强的地面低气压、巴利阿里群岛以东为中心的一般东北风和伊比利亚半岛上的短斜压波以及西班牙东北海岸的东风是驱动暴雨事件的最相关的大气环流。
Changes in the dynamics of sediment transport in a Mediterranean lake (sediment fluidization events) are linked to atmospheric circulations patterns (trough monthly precipitation). In the basins of Lake Banyoles, located in the northeast of Spain, water enters mainly through subterranean springs, and associated fluctuations in the vertical migration of sediment distribution (fluidization events) present episodic behavior as a result of episodic rainfall in the area. The initiation of the fluidization events takes place when the monthly rainfall is ∼2.7 times greater than the mean monthly rainfall of the rainiest months in the area, especially in spring (April and May), October, and December. The duration of these events is found to be well correlated with the accumulated rainfall of the preceding 10 months before the process initiation. The rainfall, in turn, is mainly associated with six atmospheric circulation patterns among the 19 fundamental circulations that emerged in an earlier study focused on significant rainfall days in Mediterranean Spain. Among them, accentuated surface lows over the northeast of Spain, general northeasterly winds by low pressure centered to the east of Balearic Islands and short baroclinic waves over the Iberian Peninsula, with easterly flows over the northeastern coast of Spain, are found the most relevant atmospheric circulations that drive heavy rainfall events.