Effects of impurities on the ice microstructure of Monte Perdido Glacier, Central Pyrenees, NE Spain

IF 2.5 4区地球科学 Q2 GEOGRAPHY, PHYSICAL

Annals of Glaciology Pub Date : 2023-11-03 DOI:10.1017/aog.2023.66

Nicolás González-Santacruz, Patricia Muñoz-Marzagon, Miguel Bartolomé, Ana Moreno, Jennifer Huidobro, Sérgio Henrique Faria

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引用次数: 0

Abstract

Abstract Monte Perdido Glacier, located in the central Pyrenees, is one of the southernmost glaciers in Europe. Due to climate change, this glacier is suffering an accelerated mass loss, especially in the last decades. If the current trends persist, this glacier is expected to disappear in the next 50 years. As part of the efforts of the scientific community to increase the knowledge about this glacier, this research presents the first microstructural characterization of the Monte Perdido Glacier, focused on a high-impurity concentration segment that belongs to an ice core drilled in 2017. The results reveal the ice has a layering defined by air bubbles and non-soluble impurities. The bubble-defined layering exhibits features of both a primary (sedimentary) and a secondary (strain-induced) origin. We found a clear inverse correspondence between the particle concentration and the grains' size and roundness index. A preliminary micro-Raman characterization of the particles shows the occurrence of atacamite, anatase (likely related to ancient mining activities in the vicinity of the glacier) and quartz. The latter could be an indicator of mineral dust, probably suggesting the arrival of dust-laden air masses from the north of the African continent.

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杂质对西班牙东北部比利牛斯山脉中部Monte Perdido冰川冰微观结构的影响

Monte Perdido冰川位于比利牛斯山脉中部，是欧洲最南端的冰川之一。由于气候变化，这条冰川正在遭受加速的质量损失，特别是在过去的几十年里。如果目前的趋势持续下去，预计这座冰川将在未来50年内消失。作为科学界增加对该冰川知识的努力的一部分，本研究首次对Monte Perdido冰川进行了微观结构表征，重点研究了2017年钻探的冰芯中高杂质浓度的部分。结果表明，冰具有由气泡和不溶性杂质定义的分层。气泡定义的层理具有原生(沉积)和次生(应变)成因的特征。我们发现颗粒浓度与晶粒尺寸和圆度指数呈明显的反比关系。对这些颗粒进行的初步微观拉曼表征显示，它们含有无辉石、锐钛矿(可能与冰川附近的古代采矿活动有关)和石英。后者可能是矿物尘埃的一个指标，可能表明来自非洲大陆北部的含尘气团的到来。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Annals of Glaciology GEOGRAPHY, PHYSICAL-GEOSCIENCES, MULTIDISCIPLINARY

CiteScore

8.20

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Annals of Glaciology publishes original scientific articles and letters in selected aspects of glaciology-the study of ice. Each issue of the Annals is thematic, focussing on a specific subject. The Council of the International Glaciological Society welcomes proposals for thematic issues from the glaciological community. Once a theme is approved, the Council appoints an Associate Chief Editor and a team of Scientific Editors to handle the submission, peer review and publication of papers.