Salinity impact on water flow and lake ice in Lake Vostok, Antarctica
Salinity impact on water flow and lake ice in Lake Vostok, Antarctica
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盐度对南极洲沃斯托克湖水流和湖冰的影响
DOI：
10.1029/2003gl017380
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发表时间：
2003
影响因子：
5.2
通讯作者：
M. Siegert
中科院分区：
文献类型：
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作者：
C. Mayer;K. Grosfeld;M. Siegert
沃斯托克湖数百万年来与大气层隔绝，提供了一个独特的，迄今无法进入的栖息地。通过使用数值模式，和最近的几何信息，湖泊环流进行了研究，为不同的盐岩。对于淡水，发生热驱动循环，这是由于倾斜冰顶处的压力依赖性熔点差异造成的。从北到南的冰泵提供了稳定的冰川水供应。弱环流是由非常小的密度对比驱动的，但不需要不寻常的地热输入。然而，在低盐度条件下，环流加剧，占据了整个湖泊。融化/冻结的最大振幅增加约50%，融化进一步向南延伸。在这两种情况下，东方站下方约有200 m的再冻结冰积累。湖泊生境将明显受到盐度的影响。为了理解这种独特的环境和规划原位实验，建立特定的化学是必不可少的。
Lake Vostok, isolated from direct exchange with the atmosphere for millions of years, provides a unique, so far inaccessible habitat. By using a numerical model, and recent geometry information, the lake circulation was investigated for different salinites. For freshwater, thermally driven circulation occurs, resulting from pressure‐dependent melting point differences at the inclined ice ceiling. North to south ice pumping provides a steady supply of glacial water. The weak circulation is driven by very small density contrasts, but requires no unusual geothermal input. For low salinity conditions, however, circulation intensifies, occupying the entire lake. The maximum amplitudes of melting/freezing increase by about 50% and melting extends further south. For both conditions approximately 200 m of refrozen ice accumulates beneath Vostok Station. The lake habitat will be affected clearly by salinity. It is essential to establish the specific chemistry for comprehending this unique environment and planning in situ experiments.