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Linkage between dust cycle and loess of the Last Glacial Maximum in Europe

机译:欧洲上次冰川最大灰尘循环与黄土之间的联系

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This article establishes a linkage between the mineral dust cycle and loess deposits during the Last Glacial Maximum (LGM) in Europe. To this aim, we simulate the LGM dust cycle at high resolution using a regional climate–dust model. The model-simulated dust deposition rates are found to be comparable with the mass accumulation rates of the loess deposits determined from more than 70?sites. In contrast to the present-day prevailing westerlies, winds from northeast,?east, and southeast?(36%) and cyclonic regimes (22%) were found to prevail over central Europe during the LGM. This supports the hypothesis that the recurring east sector winds associated with a high-pressure system over the Eurasian ice sheet?(EIS) dominated the dust transport from the EIS?margins in eastern and central Europe. The highest dust emission rates in Europe occurred in summer and autumn. Almost all dust was emitted from the zone between the Alps, the Black?Sea, and the southern EIS margin. Within this zone, the highest emission rates were located near the southernmost EIS margins corresponding to the present-day German–Polish border region. Coherent with the persistent easterlies, westward-running dust?plumes resulted in high deposition rates in western Poland, northern Czechia, the Netherlands, the southern North Sea region, and on the North German Plain including adjacent regions in central Germany. The agreement between the climate model simulations and the mass accumulation rates of the loess deposits corroborates the proposed LGM dust cycle hypothesis for Europe.
机译:本文在欧洲上次冰川最大(LGM)期间,在矿物粉尘周期和黄土沉积物之间建立了联系。为此,我们使用区域气候粉尘模型在高分辨率下模拟LGM灰尘周期。发现模拟模拟的粉尘沉积速率与从70多个(70多个位点)确定的黄土沉积物的质量累积速率相当。与现在的当今普遍存在的西风相比,来自东北的风,?东部和东南?(36%)和飓风制度(36%)在LGM期间在中欧举行。这支持了与欧亚冰盖上的高压系统相关的经常性东部扇区风的假设?(EIS)主导了EIS的灰尘运输?东部和中欧的利润率。欧洲最高的尘埃排放率在夏季和秋季发生。几乎所有的灰尘都从阿尔卑斯山,黑色?海和南欧统计局之间排放。在该区内,最高排放率位于与本日德国波兰边境地区相对应的最南端最南部的EIS边缘附近。与持久的东方,西方尘埃连贯,羽毛导致波兰西部,北捷克北部,北部海域北部北部海域和北德国平原等沉积速率高,包括德国中部的邻近地区。气候模型模拟与黄土沉积物的质量积累之间的协议证实了欧洲的提议的LGM灰尘周期假设。

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