极地研究

极地研究 ›› 2024, Vol. 36 ›› Issue (4): 623-639.DOI: 10.13679/j.jdyj.20230003

• 研究论文 • 上一篇    下一篇

阿蒙森海西部陆架边缘冰山犁沟的形态特征及影响因素研究

赵宁1,高金耀2,马朋云1,韩喜彬3,孙曦2,阳凡林4,葛倩3   

  1. 1山东科技大学测绘与空间信息学院, 山东 青岛 266590; 
    2自然资源部海底科学重点实验室, 浙江 杭州 310012; 
    3自然资源部第二海洋研究所, 浙江 杭州 310012;
    4自然资源部海洋环境探测技术与应用重点实验室, 广东 广州 510300

  • 收稿日期:2023-02-20 修回日期:2023-04-14 出版日期:2024-12-31 发布日期:2025-01-15
  • 通讯作者: 韩喜彬
  • 作者简介:赵宁, 女, 1996年生。硕士研究生, 主要从事海洋测绘研究。E-mail: luckyzhaon@163.com
  • 基金资助:
    图们江河口地形变化监测及沉积环境演变研究;南极专项“南极重点海域对气候变化的响应和影响

Morphological characteristics and influencing factors of iceberg furrows on the western Amundsen Sea continental shelf margin

ZHAO Ning1,2,3, GAO Jinyao2,3,4, MA Pengyun1,2,3, HAN Xibin2,3, SUN Xi2,3, YANG Fanlin1, GE Qian2,3, DONG Chao4, LU Xiaoming2,3, YANG Chunguo2,3   

  1. 1College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China;
    2Key Laboratory of Submarine Geosciences, Ministry of Nature Resources, Hangzhou 310012, China;
    3Second Institute of Oceanography, Ministry of Nature Resources, Hangzhou 310012, China;
    4Key Laboratory of Marine Environmental Exploration Technology and Application, Ministry of Natural Resources, 
    Guangzhou 510300, China
  • Received:2023-02-20 Revised:2023-04-14 Online:2024-12-31 Published:2025-01-15
  • Contact: Xi-Bin HAN

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摘要：  冰山犁沟作为典型的冰山侵蚀地貌, 其形态特征和影响因素研究涉及冰山的形态、龙骨深度和漂移方向, 有助于了解冰架边缘裂解的历史和动态。本文通过解译南极阿蒙森海西部陆架边缘的高精度多波束水深地形, 发现了大量的冰山犁沟, 并运用V指数模型, 分析了冰山犁沟与波纹脊的形态与分布特征, 统计了冰山犁沟的走向、长度以及沟内波纹脊的脊高度和脊间距, 对其影响因素进行了探讨。冰山犁沟的宽深比、V指数大小以及横截剖面形态特征很好地指示了形成犁沟的冰山龙骨的尺寸与形状, 表明研究区内所有冰山犁沟主体走向为NEE—SWW, 较完整犁沟主体走向为NE, 主要与向陆架外缘流动的沿岸流有关; 部分较长犁沟走向为NW, 主要与向西沿岸流、偏东下降风或南极陆坡流有关。冰山犁沟V指数平均值为0.132, 中位数为0.121, 其宽深比平均值为32.33, 中位数为27.37。较小的宽深比和V指数表明, 冰山犁沟的形成主要与小尺寸的冰山有关, 冰山龙骨较深、较尖锐。冰山犁沟内部或者边缘分布着波纹脊微地貌, 脊高度为0.1~5.7 m, 平均脊高度为2.0 m, 脊间距为10~288 m, 主要由成组冰山受潮汐上下垂直作用在冰山后缘堆积沉积物形成。

关键词: 冰山犁沟, 波纹脊, 阿蒙森海, 盖茨冰架, 冰山龙骨, 潮汐运动

Abstract: Iceberg furrow is a typical iceberg erosion landform, and its morphological characteristics and influencing factors are related to iceberg morphology, keel depth and drift direction, which is helpful to understand the history and dynamics of ice shelf edge cracking. In this paper, a large number of iceberg furrows were discovered by interpreting the high-precision multi-beam water depth topography of the western Amundsen Sea shelf in Antarctica. The shape and distribution characteristics of iceberg furrows and corrugation ridge were analyzed by using the V-index model. The strike and length of iceberg furrows and the ridge height and ridge spacing of the corrugation ridge in the ridge were calculated, and the influencing factors were discussed. The width-depth ratio of iceberg furrows, the size of V-index and the morphological characteristics of the cross section can well indicate the size and shape of the iceberg keel that formed the furrows, indicating that the main strike of all iceberg furrows in the study area is NEE—SWW, and the main strike of the intact upper furrows is NE, which is mainly related to the coastal current flowing to the outer edge of the shelf. Part of the longer furrow strike is NW, which is mainly related to westward coastal current, easterly downwind or Antarctic continental slope current. The average V-index of iceberg furrow was 0.132 and the median was 0.121, and the average width-depth ratio was 32.33 and the median was 27.37. The smaller width-to-depth ratio and V-index indicate that the formation of iceberg furrows is mainly associated with smaller icebergs with deeper, sharper keels. The corrugation ridges are distributed in the interior or edge of furrows, the ridge height ranges from 0.1 to 5.7 m, the average ridge height is 2.0 m, and the ridge spacing is 10 to 288 m. The analysis shows that the formation is mainly caused by the accumulation of sediments on the back edge of icebergs under the vertical action of tides.

Key words: iceberg furrow, iceberg keel, morphological characteristics and influencing factors, Amundsen Sea