Ice wedges as archives of winter paleoclimate: A review
Ice wedges as archives of winter paleoclimate: A review
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DOI：
10.1002/ppp.1980
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发表时间：
2018-07
影响因子：
5
通讯作者：
T. Opel;H. Meyer;S. Wetterich;T. Laepple;A. Dereviagin;J. Murton
中科院分区：
文献类型：
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作者：
T. Opel;H. Meyer;S. Wetterich;T. Laepple;A. Dereviagin;J. Murton
冰楔是北方永久冻土景观的一个特征，主要由融雪生长，融雪在冬季打开的热收缩裂缝中重新冻结。在高纬度地区，降水的稳定同位素组成（δ18O和δD）对气温敏感。因此，冬季降水的综合气候信息被转移到单个冰脉中，并可以保存数千年，从而允许使用冰楔来重建过去的冬季气候。最近的研究表明，基于冰楔的古气候重建在更全面地重建北极过去气候演变方面具有很大的潜力。我们简要地强调了冰楔古气候学的潜力，并对其现状进行了回顾。概述了现有的知识差距和挑战，并提出了未来冰楔研究的重点。主要研究方向为：(1)冻裂和充填动力学；(2)稳定同位素信息的形成和保存；(3)冰楔测年；(4)年龄模型的建立；(5)稳定同位素时间序列的解释。这些主题的进展将有助于开发冰楔的古气候潜力，特别是考虑到它们独特的寒冷季节信息，这是其他陆地气候档案没有充分涵盖的。
Ice wedges are a characteristic feature of northern permafrost landscapes and grow mainly by snowmelt that refreezes in thermal contraction cracks that open in winter. In high latitudes the stable‐isotope composition of precipitation (δ18O and δD) is sensitive to air temperature. Hence, the integrated climate information of winter precipitation is transferred to individual ice veins and can be preserved over millennia, allowing ice wedges to be used to reconstruct past winter climate. Recent studies indicate a promising potential of ice‐wedge‐based paleoclimate reconstructions for more comprehensive reconstructions of Arctic past climate evolution. We briefly highlight the potential and review the current state of ice‐wedge paleoclimatology. Existing knowledge gaps and challenges are outlined and priorities for future ice‐wedge research are suggested. The major research topics are (1) frost cracking and infilling dynamics, (2) formation and preservation of the stable‐isotope information, (3) ice‐wedge dating, (4) age‐model development and (5) interpretation of stable‐isotope time series. Progress in each of these topics will help to exploit the paleoclimatic potential of ice wedges, particularly in view of their unique cold‐season information, which is not adequately covered by other terrestrial climate archives.