Initial in situ measurements of perennial meltwater storage in the Greenland firn aquifer
Initial in situ measurements of perennial meltwater storage in the Greenland firn aquifer
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格陵兰冷杉含水层常年融水储存量的初步现场测量
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
L. Brucker
中科院分区：
文献类型：
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作者：
L. Koenig;C. Miège;R. Forster;L. Brucker
2011年，在格陵兰岛东南部发现了一个积雪含水层的常年蓄水池。我们介绍了对含水层的第一次现场测量，包括密度和温度。在~12~37 m深度处有水存在，提取岩芯中水的含量为18.7 ± 0.9 kg。积水将积雪填满至约35 m的容量。测量表明，含水层温度保持在熔点，代表积雪内有大量的热储。利用雷达测量的液态水范围和含水层表面深度的模型结果，我们将现场测量扩展到格陵兰冰盖。估算的水量为140GT± 20GT，相当于海平面上升约0.4 mm。目前尚不清楚含水层是否通过排水和(或)冰动力学临时缓冲了SLR或促进了SLR。
A perennial storage of water in a firn aquifer was discovered in southeast Greenland in 2011. We present the first in situ measurements of the aquifer, including densities and temperatures. Water was present at depths between ~12 and 37 m and amounted to 18.7 ± 0.9 kg in the extracted core. The water filled the firn to capacity at ~35 m. Measurements show the aquifer temperature remained at the melting point, representing a large heat reservoir within the firn. Using model results of liquid water extent and aquifer surface depth from radar measurements, we extend our in situ measurements to the Greenland ice sheet. The estimated water volume is 140 ± 20 Gt, representing ~0.4 mm of sea level rise (SLR). It is unknown if the aquifer temporary buffers SLR or contributes to SLR through drainage and/or ice dynamics.