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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Dust rains in Mallorca (Western Mediterranean): their occurrence and role in some recent geological processes.
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Dust rains in Mallorca (Western Mediterranean): their occurrence and role in some recent geological processes.

机译：马略卡岛（西地中海）的沙尘暴：它们的发生和在一些近期地质过程中的作用。

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摘要

Dust rains were observed in Palma de Mallorca (Island of Mallorca, Western Mediterranean) on 253 days in the 22-year period from 1982 to 2003. These and other data from the Western Mediterranean show that dust rains are on the increase. Most occur in the warmest season of the year. Meteorological conditions associated with this phenomenon combine hot advection from the south at low tropospheric levels with southwest winds associated with a depression in the middle troposphere. Dry deposition of dust, often in aggregates 40-300 micro m across, is occasionally observed. Analysed samples are silty and mainly composed of quartz and kaolinite. They also contain minor proportions of feldspars and palygorskite, which do not occur as rock-forming minerals in the Balearic Islands. Comparisons of the dusty rainwater samples with soils and recent marine and karstic sediments suggest that dust deposition is an important sedimentary process in the Balearic Islands..
机译：1982年至2003年的22年间，在Palma de Mallorca（西地中海马洛卡岛）观察到了253天的沙尘暴。这些和其他来自西地中海的数据表明，沙尘暴雨呈增加趋势。大多数发生在一年中最温暖的季节。与这种现象有关的气象条件将对流层低层南部的热对流与对流层中部凹陷相关的西南风结合在一起。偶尔会观察到干粉尘沉积，通常聚集在40-300微米的聚集体中。分析样品为粉质，主要由石英和高岭石组成。它们还含有少量的长石和坡缕石，它们在巴利阿里群岛不是成岩矿物。将尘土飞扬的雨水样品与土壤以及最近的海洋和岩溶沉积物进行的比较表明，尘埃沉积是巴利阿里群岛的重要沉积过程。

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