We examined sediment melt-migration dynamics in the ice cover of Lake Fryxell, Taylor Valley, McMurdo Dry Valleys, Antarctica, using a combination of laboratory experiments, field observations, and modeling. The specific objectives were to determine the thermal conditions required for sediment melt and how sediment migration rates vary with meteorological forcings and ice microstructure. These characteristics are relevant to the influence of climate change on lake ice structure and ecosystem processes in polar regions. Sediment began melting through laboratory ice at −2 °C in simulated summer conditions, with warmer ice producing faster melt rates. An energy balance model, supported by our laboratory experiments, demonstrated that subsurface sediment can melt down to an equilibrium depth of ∼2 m in two years. Field experiments and modeling revealed that surficial sediment melts at about half the rate of subsurface sediment because of heat losses to shallow, cold ice and the cold, dry atmosphere. Gravity flow of sediment along grain boundaries was pronounced in laboratory ice warmer than −1 °C. This mechanism produced a flux of 0.1 g m−2 hr−1, a significant value relative to published benthic sedimentation rates for these lakes indicating an important sediment sorting mechanism.

Steven M. Jepsen

Edward E. Adams

John C. Priscu

Arctic Antarctic and Alpine Research

北极、南极和高山研究 (AAAR) 的使命是通过发表过去、现在和未来高纬度地区和山区的原创科学研究，促进对寒冷地区环境的了解。今天寒冷地区发生的快速环境变化凸显了这项研究的全球重要性。 AAAR 发表经过同行评审的跨学科论文，包括原创研究论文、简短交流和评论文章。其中许多论文综合了各种学科，包括生态学、气候学、地貌学、冰川学、水文学、古海洋学、生物地球化学和社会科学。论文可以是单学科或多学科的，但应该具有跨学科的吸引力。鼓励特殊主题问题和程序。该杂志收到来自学术界、政府机构和土地管理者的不同国际作者的贡献。此外，该杂志还发表评论文章、书评和回忆录。 AAAR 与科罗拉多大学博尔德分校最古老的活跃研究机构北极和高山研究所 (INSTAAR) 有关联。

The mission of Arctic, Antarctic, and Alpine Research is to enhance the understanding of cold region environments by publishing original scientific research on high-latitude areas and mountainous regions. The rapid environmental changes occurring in these cold regions today underscore the global significance of this research. The journal publishes peer-reviewed interdisciplinary papers, including original research articles, brief communications, and review articles. Many of these papers integrate various disciplines, including ecology, climatology, geomorphology, glaciology, hydrology, paleoceanography, biogeochemistry, and social sciences. Papers can be single-discipline or multidisciplinary but should have interdisciplinary appeal. Special thematic issues and programs are encouraged. The journal receives contributions from international authors across academia, government agencies, and land managers. Additionally, it publishes commentary articles, book reviews, and memoirs. Arctic, Antarctic, and Alpine Research is affiliated with the Institute of Arctic and Alpine Research (INSTAAR), the oldest active research institute at the University of Colorado Boulder.

《Arctic, Antarctic, and Alpine Research》的使命是通过发表关于高纬度地区和山区的原创科学研究，促进对寒冷地区环境的理解。当前寒冷地区的快速环境变化凸显了这项研究的全球重要性。该期刊发表经过同行评审的跨学科论文，包括原创研究、简短交流和评论文章。许多论文综合了生态学、气候学、地貌学、冰川学、水文学、古海洋学、生物地球化学和社会科学等多个学科。论文可以是单一学科或多学科的，但应具有跨学科的吸引力。我们鼓励特殊主题的问题和程序。该期刊接收来自学术界、政府机构和土地管理者的国际作者的贡献。此外，还发表评论文章、书评和回忆录。《Arctic, Antarctic, and Alpine Research》与科罗拉多大学博尔德分校最古老的活跃研究机构——北极和高山研究所（INSTAAR）有联系。

Category	Quartile
地球科学	4
地球科学, 环境科学	4
地球科学, 自然地理	4

Sediment Melt-Migration Dynamics in Perennial Antarctic Lake Ice

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Journal Info

Category	Quartile
GEOGRAPHY, PHYSICAL	3