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Mesoscale convective systems in Spain: instability conditions and moisture sources involved

机译：西班牙的中尺度对流系统：不稳定条件和湿气源

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摘要

Source-receptor water vapor content areas are analyzed for a particular caseof deep mesoscale convective system (MCS) developed over the Mediterraneanmargin of Spain in October 1982. The aim of this work is to studysimultaneously the atmospheric instability conditions and water vapourfluxes which finally resulted in very severe precipitation rates, reachingup to 600 mm in a single day. Humidity amounts and transport are quantifiedalong the trajectories computed from a lagrangian particle simulation model(FLEXPART6.2). To evaluate the precipitation probability, the water vaporcontent and both thermodynamic and dynamic atmospheric instabilitycomponents were assessed. The October 1982 Iberian MCS occurred as aconsequence of a deep cutoff low detected between 500 and 200 hPa levels.The dynamical instability was measured through potential vorticity anomaliesand Q vector divergence, which presented their maximum and minimum centersrespectively over south-eastern Iberia. Synoptic and dynamic instabilityconditions were obtained from the ERA-40 reanalysis dataset. It is observedthat during this severe weather episode, the specific humidity increasedalong the lowest and easternmost trajectories, which are mainly spread overthe Mediterranean Sea.
机译：针对1982年10月在西班牙地中海沿岸开发的深中尺度对流系统（MCS）的特殊情况，分析了源-受体水汽含量区域。这项工作的目的是同时研究大气的不稳定条件和水蒸气通量，最终导致严重的降水速率，单日可达600毫米。根据拉格朗日粒子模拟模型（FLEXPART6.2）计算出的轨迹，可以量化湿度和传输率。为了评估降水的可能性，评估了水汽含量以及热力学和动态大气不稳定性成分。 1982年10月的伊比利亚MCS事件是在500至200 hPa的水平上检测到一个低的临界低值的结果。通过潜在的涡度异常和Q矢量散度来测量动力学的不稳定性，这分别表示了伊比利亚东南部的最大和最小中心。天气和动态不稳定条件是从ERA-40重新分析数据集中获得的。可以看出，在这种恶劣天气期间，比湿度沿最低和最东端的轨迹增加，这些轨迹主要分布在地中海上。

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