Aufeis, also known as an icing or naled, is an accumulation of ice that forms primarily during winter when water is expelled onto frozen ground or ice surfaces and freezes in layers. Process‐oriented aufeis research initially expanded in the 20th century, but recent interest in changing hydrological conditions in permafrost regions has rejuvenated this field. Despite its societal relevance, the controls on aufeis distribution and dynamics are not well defined and this impedes projections of variation in aufeis size and distribution expected to accompany climate change. This paper reviews the physical controls on aufeis development, current broad‐scale aufeis distribution and anticipated change, and approaches to aufeis investigation. We propose an adjustment to terminology to better distinguish between the formation process and resulting ice bodies, a clarification of the aufeis classification approach based on source water, and a size threshold for broad‐scale aufeis inventory to facilitate collaborative research. We identify additional objectives for future research including advancing process knowledge at fine spatial scales, describing broad‐scale distribution using current remote sensing capabilities, and improving our understanding and predictive capacity over the interactions between aufeis and landscape‐scale permafrost, hydrogeological, geotectonic, and climate conditions.

中文翻译：

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多年冻土区aufeis的分布及动态

Aufeis，也称为结冰或结冰，是一种主要在冬季形成的冰堆积，当时水被排出到冰冻的地面或冰面上并分层冻结。以过程为导向的 aufeis 研究最初在 20 世纪扩展，但最近对改变永久冻土地区水文条件的兴趣使该领域重新焕发活力。尽管具有社会相关性，但对 aufeis 分布和动态的控制并没有明确定义，这阻碍了预计伴随气候变化而发生的 aufeis 大小和分布变化的预测。本文回顾了对 aufeis 发展的物理控制、当前广泛的 aufeis 分布和预期变化，以及 aufeis 调查的方法。我们建议调整术语以更好地区分形成过程和由此产生的冰体，澄清基于源水的 aufeis 分类方法，以及大规模 aufeis 库存的大小阈值以促进合作研究。我们确定了未来研究的其他目标，包括在精细空间尺度上推进过程知识，使用当前的遥感能力描述大尺度分布，以及提高我们对 aufeis 与景观尺度永久冻土、水文地质、大地构造和气候条件。