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首页> 外文期刊>Science Advances >Absence of ice-bonded permafrost beneath an Arctic lagoon revealed by electrical geophysics
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Absence of ice-bonded permafrost beneath an Arctic lagoon revealed by electrical geophysics

机译：在北极泻湖下面缺乏冰键合的永久冻结，电气物理学透露

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Relict permafrost is ubiquitous throughout the Arctic coastal shelf, but little is known about it near shore. The presence and thawing of subsea permafrost are vital information because permafrost stores an atmosphere’s worth of carbon and protects against coastal erosion. Through electrical resistivity imaging across a lagoon on the Alaska Beaufort Sea coast in summer, we found that the subsurface is not ice-bonded down to ~20 m continually from within the lagoon, across the beach, and underneath an ice-wedge polygon on the tundra. This contrasts with the broadly held idea of a gently sloping ice-bonded permafrost table extending from land to offshore. The extensive unfrozen zone is a marine talik connected to on-land cryopeg. This zone is a potential source and conduit for water and dissolved organic matter, is vulnerable to physical degradation, and is liable to changes in biogeochemical processes that affect carbon cycling and climate feedbacks.
机译：Relict Permafrost在整个北极沿海架子中都在普遍存在，但对岸边附近有很少的知名。海底Permafrost的存在和解冻是重要信息，因为永久冻土存储了气氛的碳，并防止沿海侵蚀。通过在夏天的阿拉斯加博览会海岸泻湖上的电阻率成像，我们发现，从海滩横跨海滩，在泻湖内并在冰楔下的冰孔中不断地将地下融合到〜20米。苔原。这与从陆地延伸到海上的轻微倾斜的冰粘合的永久冻土桌子的广泛持有的思想形成鲜明对比。广泛的联系区是一个与陆地冷冻尼泊尔连接的海洋滑石。该区域是水和溶解有机物的潜在来源和导管，容易受到物理降解的影响，并且易于影响影响碳循环和气候反馈的生物地球化学过程。

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