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Shallow groundwater systems in a polar desert, McMurdo Dry Valleys, Antarctica

Systèmes peu profonds d’eau souterraine dans un désert polaire, Vallées sèches de McMurdo, Antarctique

Sistemas de agua subterránea poco profundos en un desierto polar, McMurdo Dry Valleys, Antartica

南极洲McMurdo Dry山谷极地沙漠的浅层地下水系统

Sistemas de águas subterrâneas pouco profundas num deserto polar, McMurdo Dry Valleys, Antártida

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Abstract

The McMurdo Dry Valleys (MDVs), Antarctica, exist in a hyperarid polar desert, underlain by deep permafrost. With an annual mean air temperature of −18 °C, the MDVs receive <10 cm snow-water equivalent each year, collecting in leeward patches across the landscape. The landscape is dominated by expansive ice-free areas of exposed soils, mountain glaciers, permanently ice-covered lakes, and stream channels. An active layer of seasonally thawed soil and sediment extends to less than 1 m from the surface. Despite the cold and low precipitation, liquid water is generated on glaciers and in snow patches during the austral summer, infiltrating the active layer. Across the MDVs, groundwater is generally confined to shallow depths and often in unsaturated conditions. The current understanding and the biogeochemical/ecological significance of four types of shallow groundwater features in the MDVs are reviewed: local soil-moisture patches that result from snow-patch melt, water tracks, wetted margins of streams and lakes, and hyporheic zones of streams. In general, each of these features enhances the movement of solutes across the landscape and generates soil conditions suitable for microbial and invertebrate communities.

Résumé

Les vallées sèches de McMurdo (McMurdo Dry Valleys; MDVs), en Antarctique, se trouvent dans un désert polaire hyperaride, reposant sur un permafrost profond. Avec une température moyenne de l’air de −18 °C, les MVDs reçoivent moins de 10 cm d’eau sous forme de neige se rassemblant par plaques sous le vent à travers le paysage. Le paysage est dominé par de vastes zones de sols affleurants libres de glace, des glaciers de montagne, des lacs couverts de glace en permanence et des chenaux de cours d’eau. Une couche active de sol gelé de façon saisonnière et de sédiments se développe sur moins d’1 mètre depuis la surface. Malgré le froid et les faibles précipitations, l’eau sous forme liquide est générée par les glaciers et les plaques de neige durant l’été austral, s’infiltrant à travers la couche active de sol. A travers les MDVs, l’eau est généralement restreinte à des profondeurs faibles et dans des conditions souvent non saturées. La compréhension actuelle et la signification biogéochimique/écologique des particularités de quatre types d’eau souterraine peu profonde dans les MDVS sont examinées : tâches locales d’humidité du sol qui résultent de la fonte de plaques de neige, traces d’eau, berges humides des cours d’eau et lacs et zones hyporhéiques des rivières. En général chacune de ces caractéristiques augmente le mouvement de corps dissous à travers le paysage et génère des conditions de sol favorables aux communautés microbiennes et invertébrées.

Resumen

Los valles McMurdo Dry (MDVs), Antartica, existen en un desierto polar hiperárido suprayacente a un permafrost profundo. Los MDVs, con una temperatura media anual del aire de −18 °C, reciben <10 cm de agua equivalente de nieve cada año, recolectadas a través del paisaje en manchas a sotavento. El paisaje está dominado por extensas áreas libres de hielo en suelos expuestos, glaciares de montaña, lagos permanentemente cubiertos por hielo, y canales de corrientes. Una capa activa de suelo estacionalmente descongelado se extiende en los sedimentos a menos que 1 m de la superficie. A pesar de la baja y fría precipitación, se genera agua líquida en los glaciares y las manchas de nieve durante el verano austral, infiltrándose en la capa activa. A través de los MDVs, el agua subterránea es confinada a profundidades someras y a menudo en condiciones no saturadas. La comprensión actual y el significado biogeoquímica/ecológico de cuatro tipos de características de agua subterránea somera en los MDVs son revisados: las manchas locales de humedad de suelos a partir del derretimiento de manchas de nieve, las vías de agua, los márgenes húmedos de corrientes y lagos, y las zonas hiporreicas de corrientes. En general, cada una de estas características mejora el movimiento de solutos a través del paisaje y genera condiciones de suelos adecuadas para comunidades microbianas y de invertebrados.

摘要

南极洲的McMurdo Dry山谷(MDVs)深层永久冻土下伏有一极端干旱的极地沙漠。该地区多年平均气温 −18 °C,年均降雪小于10cm,并汇集在横穿景区的下风口处。景区是主要由广阔的裸露土壤区、高山冰川、永久冰覆盖湖以及河道主导。季节性消融的土壤和沉积物组成的活动层延伸不到地下1m。尽管南半球的夏季寒冷、降雨少,由冰川及雪堆产生的液态水浸润活动层。横穿MDVs,地下水通常限制在很浅的深度内,且经常处于不饱和状态。总结MDVs四种类型浅层地下水特征的当前理解及其生物地球化学或生态学意义:雪堆融化、水道、河流及湖泊的润湿边缘以及河流的伏流区产生局部土壤水分区。通常每种类型都增加了溶质横穿景区的运移,形成适合微生物及无脊椎动物群体的土壤条件。

Resumo

Os McMurdo Dry Valleys (MDV), Antártida, existem num deserto hiperárido polar sobreposto a permafrost profundo. Com uma temperatura média anual do ar de −18 °C, os MDV recebem por ano <10 cm de água equivalente em neve coletada de sotavento, em manchas dispersas na paisagem. A paisagem é dominada por áreas extensas livres de gelo e com solos expostos, glaciares de montanha, lagos permanentemente cobertos de gelo e canais de escoamento. Uma camada ativa de solo e sedimentos sazonalmente descongelados estende-se até menos de 1 m da superfície. Apesar do frio e da baixa precipitação, a água líquida é gerada em glaciares e em manchas de neve durante o verão austral, infiltrando-se na camada ativa. Através dos MDV a água subterrânea é geralmente limitada a profundidades reduzidas e muitas vezes em condições não saturadas. É revisto o entendimento atual e o significado biogeoquímico/ecológico de quatro tipos de características da água subterrânea pouco profunda nos MDV: manchas localizadas de humidade do solo que resultam da fusão de manchas de neve, percursos de escoamento de água, margens húmidas de linhas de água e lagos, e zonas hiporreicas de linhas de água. Em geral, cada uma dessas características promove o movimento de solutos através da paisagem e gera as condições de solo apropriadas para comunidades microbianas e de invertebrados.

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Acknowledgements

The authors gratefully acknowledge their Antarctic collaborators and colleagues, Raytheon Polar Services for logistical support, Petroleum Helicopters, Inc. for logistical support, and funding support from NSF grant numbers, ANT-0851965, ANT-1043785, ANT-0830050, ANT-0838879, and ANT-0838922. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.

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Gooseff, M.N., Barrett, J.E. & Levy, J.S. Shallow groundwater systems in a polar desert, McMurdo Dry Valleys, Antarctica. Hydrogeol J 21, 171–183 (2013). https://doi.org/10.1007/s10040-012-0926-3

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