Emerging polar coasts have different geothermal regimes than those in submergence. While the scientific community is mainly concerned with rapidly eroding permafrost coastlines in sedimentary formations where relative sea level is rising, much less research has been dedicated to permafrost dynamics in emergent coastal regions where post‐glacial uplift is ongoing. The eastern Hudson Bay coast of Nunavik (northern Québec, Canada) is undergoing glacio‐isostatic uplift at a current emergence rate of about 13 mm/yr, outpacing the current global sea‐level rise (~3 mm/yr) and progressively exposing new land to climate conditions favorable for permafrost formation. To observe incipient permafrost in the shore zone over time, in 2005 we strategically installed a thermistor cable down to a depth of 23 m at a high‐tide level site. We detected the formation and the continuing deepening of permafrost near the surface. Freezing of the ground was also favored by a succession of several cold years in Nunavik since 2010. The near 0°C temperature profile at greater depths also reveals the cooling influence of deep Hudson Bay waters on the shore zone ground temperature regime and the probable presence of subsea permafrost offshore of the measurement site.

中文翻译：

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努纳维克（加拿大魁北克北部）哈德逊湾新兴东海岸的多年冻土聚集

新兴的极地海岸与淹没的地热区域不同。尽管科学界主要关注相对海平面上升的沉积岩层中永久冻土海岸线的快速侵蚀，但对于冰川后隆升仍在进行的新兴沿海地区的永久冻土动力学的研究则少得多。努纳维克（加拿大魁北克省北部）的哈德逊湾东部沿海地区正在经历冰川等静压上升，目前的上升速度约为13毫米/年，超过了当前全球海平面上升（〜3毫米/年）并逐渐暴露出新的到达有利于永久冻土形成的气候条件。为了随着时间的推移观察海岸带的初期永久冻土，我们在2005年从战略上在高潮位点安装了一个热敏电阻电缆，其深度为23 m。我们检测到了地表附近永久冻土的形成和持续加深。自2010年以来，努纳维克（Nunavik）连续数个寒冷年份也有利于地面冻结。在更深的深度，接近0°C的温度曲线也揭示了哈德逊湾深水区对海岸带地面温度体制和可能存在的降温影响。测量地点附近的海底多年冻土。