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Locally recycled late Pleistocene loess feeds modern dust storms at the desert margins of the eastern Mediterranean, Israel
Aeolian Research ( IF 3.3 ) Pub Date : 2020-05-29 , DOI: 10.1016/j.aeolia.2020.100612
Ohad Shalom , Onn Crouvi , Yehouda Enzel , Daniel Rosenfeld

Current dust storms, originating from afar, are common in Israel and the eastern Mediterranean, and thus most dust sources are considered to be distal. However, recent studies suggest that the latest Quaternary loess accreted in the Northern Negev can also serve as a proximal source of dust. These sources were mostly neglected in past discussions as contributors of dust. Here, we demonstrate that such proximal dust sources, mostly the Negev loess, currently contribute relatively large amounts of recycled dust to the regional dust cycle. We conducted a sampling campaign of deposited dust during individual dust storms and identified high content of coarse silt grains and quartzo-feldspathic minerals within and adjacent to the Negev loess that gradually decreases toward the north. These grains, characteristics of the Negev loess, indicate a short transport distance. In addition, our data reveal that local wind speed is the limiting factor for emitting proximal dust, regardless of the synoptic system. We determined that proximal sources in Israel emit dust during either local events or as a part of regional dust storms originating from afar. We evaluate the minimal contribution of this proximal dust to the total mass of deposited dust as 58–74%, 54–70%, 52–64%, and 26–34% for northern Negev, central Negev, central mountainous region, and northern Israel, respectively. These estimates indicate that at the desert fringe, both proximal and distal sources of dust should be considered when inferring dust sources from dust geochemistry that can sometimes be similar due to the long dust history.



中文翻译:

本地回收的晚更新世黄土为以色列东部地中海沙漠边缘的现代沙尘暴喂食

当前来自远方的沙尘暴在以色列和地中海东部很普遍,因此大多数尘埃源被认为是遥远的。但是,最近的研究表明,在内盖夫北部增生的最新第四纪黄土也可以作为近端尘埃来源。这些来源在过去的讨论中大多被忽略为尘埃的贡献者。在这里,我们证明了这样的近端尘埃源,主要是内盖夫黄土,目前为区域尘埃循环贡献了相对大量的回收粉尘。我们在个别沙尘暴期间进行了一次沉积尘埃采样活动,发现了内盖夫黄土内和附近的高含量的粗粉沙颗粒和石英长石矿物,并向北逐渐减少。这些谷物是内盖夫黄土的特征,表示运输距离短。此外,我们的数据表明,无论天气系统如何,局部风速都是散发近端尘埃的限制因素。我们确定,以色列的近端污染源在局部事件中或作为源自远方的局部沙尘暴的一部分会散发粉尘。我们评估了北部内盖夫,中部内盖夫,中部山区和北部这种近端尘埃对沉积尘埃总量的最小贡献为58–74%,54–70%,52–64%和26–34%以色列。这些估计表明,在沙漠边缘,从尘埃地球化学推断尘埃来源时应同时考虑近端和远端尘埃来源,由于尘埃历史悠久,这些尘埃地球化学有时可能是相似的。我们的数据表明,不管天气系统如何,局部风速都是散发近端尘埃的限制因素。我们确定,以色列的近端污染源在局部事件中或作为源自远方的局部沙尘暴的一部分会散发粉尘。我们估计北部内盖夫,中部内盖夫,中部山区和北部,近端尘埃对沉积尘埃总量的最小贡献分别为58–74%,54–70%,52–64%和26–34%以色列。这些估计表明,在沙漠边缘,从尘埃地球化学推断尘埃来源时应同时考虑近端和远端尘埃来源,由于尘埃历史悠久,这些尘埃地球化学有时可能是相似的。我们的数据表明,不管天气系统如何,局部风速都是散发近端尘埃的限制因素。我们确定,以色列的近端污染源在局部事件中或作为源自远方的局部沙尘暴的一部分会散发粉尘。我们估计北部内盖夫,中部内盖夫,中部山区和北部,近端尘埃对沉积尘埃总量的最小贡献分别为58–74%,54–70%,52–64%和26–34%以色列。这些估计表明,在沙漠边缘,从尘埃地球化学推断尘埃来源时应同时考虑近端和远端尘埃来源,由于尘埃历史悠久,这些尘埃地球化学有时可能是相似的。我们确定,以色列的近端污染源在局部事件中或作为源自远方的局部沙尘暴的一部分会散发粉尘。我们估计北部内盖夫,中部内盖夫,中部山区和北部,近端尘埃对沉积尘埃总量的最小贡献分别为58–74%,54–70%,52–64%和26–34%以色列。这些估计表明,在沙漠边缘,从尘埃地球化学推断尘埃来源时应同时考虑近端和远端尘埃来源,由于尘埃历史悠久,这些尘埃地球化学有时可能是相似的。我们确定,以色列的近端污染源在局部事件中或作为源自远方的局部沙尘暴的一部分会散发粉尘。我们估计北部内盖夫,中部内盖夫,中部山区和北部,近端尘埃对沉积尘埃总量的最小贡献分别为58–74%,54–70%,52–64%和26–34%以色列。这些估计表明,在沙漠边缘,从尘埃地球化学推断尘埃来源时应同时考虑近端和远端尘埃来源,由于尘埃历史悠久,这些尘埃地球化学有时可能相似。中部山区和以色列北部。这些估计表明,在沙漠边缘,从尘埃地球化学推断尘埃来源时应同时考虑近端和远端尘埃来源,由于尘埃历史悠久,这些尘埃地球化学有时可能是相似的。中部山区和以色列北部。这些估计表明,在沙漠边缘,从尘埃地球化学推断尘埃来源时应同时考虑近端和远端尘埃来源,由于尘埃历史悠久,这些尘埃地球化学有时可能是相似的。

更新日期:2020-05-29
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