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High Latitude Dust Deposition in Snow on the Glaciers of James Ross Island, Antarctica
Earth Surface Processes and Landforms ( IF 3.3 ) Pub Date : 2020-03-04 , DOI: 10.1002/esp.4831
Jan Kavan 1 , Daniel Nývlt 1 , Kamil Láska 1 , Zbyněk Engel 2 , Michaela Kňažková 1
Affiliation  

High-latitude dust (HLD) depositions on four glaciers of James Ross Island (the Ulu Peninsula) were analysed. The deposition rate on the selected glaciers varies from 11.8 to 64.0 g m(-2), which is one order of magnitude higher compared to the glaciers in Antarctica or elsewhere in the world. A strong negative relationship between the sediment amount and altitude of a sampling site was found. This is most likely caused by the higher availability of aeolian material in the atmospheric boundary layer. General southerly and south-westerly wind directions over the Ulu Peninsula - with exceptions based on local terrain configuration - help to explain the significantly lower level of sediment deposition on San Jose Glacier and the high level on Triangular Glacier. X-ray fluorescence (XRF) spectrophotometry was used to estimate the relative proportions of the main and trace (lithophile) elements in the sediment samples. Both the sediment amount and the XRF results are analysed in a depth profile at each locality and compared among the glaciers, suggesting long-range transport of fine mineral material from outside James Ross Island. The distribution of aeolian sediment among the glaciers corresponds well with the prevailing wind direction on the Ulu Peninsula.

中文翻译:

南极洲詹姆斯罗斯岛冰川雪中高纬度尘埃沉积

分析了詹姆斯罗斯岛(乌鲁半岛)四个冰川上的高纬度尘埃 (HLD) 沉积。选定冰川的沉积速率从 11.8 到 64.0 gm(-2) 不等,与南极洲或世界其他地方的冰川相比,高一个数量级。发现采样点的沉积物量和海拔高度之间存在强烈的负相关关系。这很可能是由于大气边界层中风积物质的可用性较高所致。乌鲁半岛上空的一般偏南和西南风向——基于当地地形配置的例外情况——有助于解释圣何塞冰川沉积物沉积量显着降低而三角冰川沉积物沉积量高的原因。X 射线荧光 (XRF) 分光光度法用于估计沉积物样品中主要和痕量(亲石)元素的相对比例。沉积物量和 XRF 结果都在每个地点的深度剖面中进行分析,并在冰川之间进行比较,表明来自詹姆斯罗斯岛以外的细矿物材料的长距离迁移。冰川中风积沉积物的分布与乌鲁半岛的盛行风向非常吻合。
更新日期:2020-03-04
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