Volume 43 Issue 6
Dec.  2023
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Article Navigation >  Chinese Journal of Space Science  > 2023  >  43(6): 1125-1134 Open Access
FANG Chao, WANG Sheng, LIU Guihong, DU Yanlei, ZHAO Yaming, YU Yang, YANG Xiaofeng. Spatio-temporal Distribution Characteristics of Arctic Ice Eddies Based on SAR Satellite Observations (in Chinese). Chinese Journal of Space Science, 2023, 43(6): 1125-1134 doi: 10.11728/cjss2023.06.2023-0088
Citation: FANG Chao, WANG Sheng, LIU Guihong, DU Yanlei, ZHAO Yaming, YU Yang, YANG Xiaofeng. Spatio-temporal Distribution Characteristics of Arctic Ice Eddies Based on SAR Satellite Observations (in Chinese). Chinese Journal of Space Science, 2023, 43(6): 1125-1134 doi: 10.11728/cjss2023.06.2023-0088
shu

Spatio-temporal Distribution Characteristics of Arctic Ice Eddies Based on SAR Satellite Observations

doi: 10.11728/cjss2023.06.2023-0088 cstr: 32142.14.cjss2023.06.2023-0088
  • 1.

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049

  • 3.

    Faculty of Science and Technology, University of Macau, Macau 999078

  • 4.

    P. O. Box 5111, Beijing 100094

  • Received Date: 2023-08-18
  • Rev Recd Date: 2023-10-10
    • Available Online: 2023-11-14
    Abstract
  • The complex interaction between cold and warm ocean currents in the Arctic Ocean creates favorable conditions for the formation and growth of eddies. In the marginal ice zone of the Arctic, some of the upper ice floes, resulting in the formation of distinctive rotational features. These features, which contain traces of ice floes, are referred to as “ice eddies” in this paper. Ice eddies accelerate the melting of the upper ice floes through vertical heat transfer, which affects the development of the marginal ice zone and indirectly regulates the global climate. In this paper, a study is conducted on the detection, identification, and spatial and temporal characterization of Arctic ice eddies using high-resolution Synthetic Aperture Radar (SAR) satellite images of 2022. Firstly, a training dataset is constructed using preprocessed SAR images, and the YOLOv7 target detection model is used to train the model. Then, the process of human-supervised visual identification is conducted based on the results of detection and identification, resulting in the identification of a total of 3615 cyclonic ice eddies and 1482 anticyclonic ice eddies. Finally, the ice eddies are characterized using the visual identification results mentioned above. The statistical results show that ice eddies in the Arctic Ocean are primarily generated from July to November. Their spatial distribution is concentrated along the eastern coast of Greenland and in the north-central Greenland Sea. The diameters of the ice eddies range from 3.85 to 114.9 km. 99% of the eddies are smaller than 60 km, with an average diameter of 21.2 km. 97% of the eddies have sea-ice coverage ranging from 20% to 70%, with an average sea-ice coverage of 41.76%. The results of the ice eddies detection, identification, and spatial and temporal characterization in this paper provide valuable methodological references and remote sensing analysis information for analyzing marine phenomena and conducting climate research in the Arctic region.

     

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