Lake vostok behaves like a ‘captured lake’ and may be near to creating an antarctic jökulhlaup
Lake vostok behaves like a ‘captured lake’ and may be near to creating an antarctic jökulhlaup
复制标题
沃斯托克湖的行为就像一个“被捕获的湖泊”，可能即将形成南极冰河湖
DOI：
10.1111/j.0435-3676.2006.00278.x
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Ú. Erlingsson
中科院分区：
文献类型：
--
作者：
Ú. Erlingsson
摘要最著名的冰下湖泊可能是冰岛瓦特纳约库尔下面的格里姆斯夫特湖，约库勒劳斯火山经常从那里喷发出来。它是由冰盖下的热融化形成的。另一方面，南极沃斯托克湖被认为位于一个地热传递正常的地区，在那里它可以存在，因为冰太厚了，它的底部处于压力熔点。这使得它成为测试捕获冰架(CIS)假说的候选对象，该假说指出，完全受限的冰架的运动产生了门槛上方冰缘形式的静力密封。独联体假说可能为有争议的Laurentian jökulhlaps提供水源，这是从野外数据推断的，与剧烈的气候变化有关。在这里，我表明沃斯托克湖同意这一假设，它可能处于约库拉普的边缘，这可能会造成冰流和地区性下沉。这一结果还表明，该湖很可能起源于前冰期，而且它可能在之前的间冰期经历过约库勒劳斯。
Abstract The most well known sub‐glacial lake is probably Grímsvötn under Vatnajökul, Iceland, from where jökulhlaups regularly burst forth. It is created by thermal melting under the ice cap. The Antarctic Lake Vostok, on the other hand, is considered to be located over a region with normal geothermal heat transfer, where it can exist because the ice is so thick that its base is at the pressure melting point. This makes it a candidate for testing the captured ice shelf (CIS) hypothesis, which states that the motion of a totally confined ice shelf creates a hydrostatic seal in the form of an ice rim over the threshold. The CIS hypothesis may offer a source of water for the controversial Laurentian jökulhlaups inferred from field data, implicated in dramatic climatic changes. Here I show that Lake Vostok agrees with the hypothesis, and that it may be on the verge of a jökulhlaup, which could create an ice stream and regional downdraw. The result also implies that the lake may well be of pre‐glacial origin, and that it may have experienced jökulhlaups during previous interglacials.