极地研究

极地研究 ›› 2021, Vol. 33 ›› Issue (4): 545-559.DOI: 10.13679/j.jdyj.20210004

• 研究论文 • 上一篇    下一篇

绕极深层水入侵阿蒙森海陆架的路径及其性质

白雨1，赵亮1，李磊2   

  1. 1天津科技大学海洋与环境学院, 天津 300457;
    2中国海洋大学海洋与大气学院, 山东 青岛 266100
  • 收稿日期:2021-01-05 修回日期:2021-03-12 出版日期:2021-12-31 发布日期:2021-12-16
  • 基金资助:
    国家海洋局极地考察办公室项目(RFSOCC2020-2022-No.18)

Pathways and properties of Circumpolar Deep Water intrusion on the Amundsen Sea shelf

Bai Yu1, Zhao Liang1, Li Lei 2   

  1. 1College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, China;
    2College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
  • Received:2021-01-05 Revised:2021-03-12 Online:2021-12-31 Published:2021-12-16

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摘要： 近几十年来较暖的绕极深层水(Circumpolar Deep Water, CDW)不断入侵阿蒙森海陆架, 使冰架底部融化, 导致阿蒙森海冰架质量不断损失。分析CDW入侵阿蒙森海陆架的路径及性质变化, 对研究冰架变薄和接地线后退具有重要意义。基于GLORYS12V1[Global Ocean (1/12)° Physical Reanalysis]再分析数据, 对阿蒙森海西侧、中央、东侧通道的体积输运和热输运进行了计算, 给出了陆架上CDW温度和盐度的变化特征, 并分析了它们与流场间的关系。结果表明, Dotson-Getz海槽内的CDW主要源自西侧通道, Pine Island海槽内的CDW主要源自中央通道和东侧通道。由东侧通道入侵的CDW温度最高, 西侧入侵的CDW温度最低。CDW通过西侧通道入侵陆架的体积输运和热输运在时间序列上呈现微弱的上升趋势。CDW通过中央通道向Pine Island海槽的体积输运和热输运约是东侧通道的2倍。CDW进入海槽时的温度主要受两方面影响, 一方面与入侵陆架时的温度有关, 一方面又被后续的混合过程所控制。

关键词: 绕极深层水, 阿蒙森海陆架, 流场结构, 体积输运, 热输运

Abstract:

The relatively warm Circumpolar Deep Water (CDW) has been intruding on the Amundsen Sea continental shelf in recent decades and melting the ice shelves from below, resulting in a continuous ice mass loss in the Amundsen Sea sector of the West Antarctic Ice Shelf. Analysis of the pathways and variations of the CDW intrusion onto the shelf is of great importance to understanding the phenomena of rapid ice shelf thinning and grounding line retreat in this sector. Based on GLORYS12V1 [Global Ocean (1/12)° Physical Reanalysis] data, we calculated the volume and heat transport in the western, central, and eastern channels. We analyzed the relationship between the variations in temperature and salinity of the CDW on the shelf and its flow field. Results showed that the CDW invaded the Dotson–Getz Trough from the western channel, while it invaded the Pine Island Trough from the central and eastern channels. The volume and heat transport of the CDW intruding on the shelf through the western channel showed a weak upward trend over time. The volume and heat transport of the CDW to the Pine Island Trough through the central channel was about twice as much as that through the eastern channel. The temperature of the CDW intrusion into these troughs was controlled by the temperature of the CDW, when it invaded the shelf, and by subsequent processes on the continental shelf.

Key words: Circumpolar Deep Water, Amundsen Sea shelf, flow field structure, volume transport, heat transport