Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf
Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf
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DOI：
10.1029/2018gl079706
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发表时间：
2018-08-28
影响因子：
5.2
通讯作者：
Sueltenfuss, Juergen
中科院分区：
文献类型：
--
作者：
Huhn, Oliver;Hattermann, Tore;Sueltenfuss, Juergen
气候引起的海洋驱动的南极冰架融化加速将对大陆冰排入海洋和全球海平面产生影响，并对南极底层水和海洋赤道翻转环流的形成产生影响。使用一种新型的气密性原位水取样器，从费尔奇纳冰架下的六个地点收集了惰性气体样品，这是第一次从南极冰架下收集此类样品。氦和氖是唯一适合作为海洋中冰川融水的示踪剂。基础融水分数范围从3.6%附近的冰架基地到0.5%附近的海底，具有明显的区域差异。我们估计的平均基础融化率为177 +/- 95 Gt/年的Filchner-Ronne冰架，独立确认以前的结果。我们计算出，高达2.7%的融水已重新冻结，我们确定了当地的地壳氦源。
A climatically induced acceleration in ocean-driven melting of Antarctic ice shelves would have consequences for both the discharge of continental ice into the ocean and thus global sea level, and for the formation of Antarctic Bottom Water and the oceanic meridional overturning circulation. Using a novel gas-tight in situ water sampler, noble gas samples have been collected from six locations beneath the Filchner Ice Shelf, the first such samples from beneath an Antarctic ice shelf. Helium and neon are uniquely suited as tracers of glacial meltwater in the ocean. Basal meltwater fractions range from 3.6% near the ice shelf base to 0.5% near the sea floor, with distinct regional differences. We estimate an average basal melt rate for the Filchner-Ronne Ice Shelf of 177 +/- 95 Gt/year, independently confirming previous results. We calculate that up to 2.7% of the meltwater has been refrozen, and we identify a local source of crustal helium.