Hong Lin, Xiao Cheng, Teng Li, Qian Shi, Qi Liang, Xinyu Meng, Shaoyin Wang, Lei Zheng. Assessing the degree of impact from iceberg activities on penguin colonies of Clarence Island[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-024-2355-2
Citation:
Hong Lin, Xiao Cheng, Teng Li, Qian Shi, Qi Liang, Xinyu Meng, Shaoyin Wang, Lei Zheng. Assessing the degree of impact from iceberg activities on penguin colonies of Clarence Island[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-024-2355-2
Hong Lin, Xiao Cheng, Teng Li, Qian Shi, Qi Liang, Xinyu Meng, Shaoyin Wang, Lei Zheng. Assessing the degree of impact from iceberg activities on penguin colonies of Clarence Island[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-024-2355-2
Citation:
Hong Lin, Xiao Cheng, Teng Li, Qian Shi, Qi Liang, Xinyu Meng, Shaoyin Wang, Lei Zheng. Assessing the degree of impact from iceberg activities on penguin colonies of Clarence Island[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-024-2355-2
School of Geospatial Engineering and Science, Sun Yat-sen University, and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China
2.
Key Laboratory of Comprehensive Observation of Polar Environment (Sun Yat-sen University), Ministry of Education, Zhuhai 519082, China
3.
School of Geography and Planning, Sun Yat‐sen University, Guangzhou 510006, China
4.
Guangdong Key Laboratory for Urbanization and Geo-simulation, Sun Yat-sen University, Guangzhou 510275, China
Funds:
The National Natural Science Foundation of China under contract Nos 41925027 and 42206249.
During August and September 2023, three giant icebergs, each bigger than Paris, successively grazed Clarence Island in the northeast of the Antarctic Peninsula, a home to a population of over 100 000 penguins. This incident may serve as a clarion call for the increasing iceberg calving due to global warming and its subsequent impact on the Antarctic ecosystem. Here we investigate this unexpected event and employ historical records and probabilistic analyses of iceberg grounding to assess the degree of impact on penguin colonies of Clarence Island. Among the eleven colonies, there is one with low impact, eight with medium impact, and two with high impact. The low-impact colony, Cape Lloyd, is located in the northern part of the island, while the high-impact colonies, False Ridge and Pink Pool, are in the southeast. The eight medium-impact colonies are distributed along both the eastern and western coasts of the island. This study provides essential support for evaluating the impact of iceberg activity on penguin colonies. We argue that penguin colonies located in areas prone to iceberg drift, such as Clarence Island, may become more vulnerable to the heightened risk of iceberg collisions or groundings in the warming future. Therefore, we hope the public will become more aware of the grave impacts of climate change on penguins and underscore the urgent need for effective conservation strategies.
Figure 1. Clarence Island and Penguin Colonies. Orange dots and green triangles represent penguin colonies and krill bases, respectively. Black closed lines indicate contour lines, and the brown regions depict the exposed rock areas on the island. The base map shows the bathymetric features. An inset on the right demonstrates the location of Clarence Island.
Figure 2. Heatmap of the iceberg impact on penguin colonies. The iceberg impact is categorized into three levels: low, medium, and high, corresponding to the blue, gray, and red blocks in the heatmap, respectively. The degree of iceberg impact on penguin colonies is determined by both the iceberg passage frequency (vertical axis) and the iceberg grounding probability (horizontal axis).
Figure 3. Iceberg grazing events, trajectories, and assessment of impact on penguin colonies. a. Iceberg D29B grazes the island on August 3, 2023. b. Iceberg D28 nears the island on August 15, 2023. c. Iceberg D30A grazes the island on September 8, 2023. d. Schematic of a flat iceberg nearing the island. e. Trajectories of the three icebergs from July to September 2023 and average wind speeds for the period. Inset on the left features a Sentinel-2 image from September 8, 2023, showing abundant sea ice fragments. f. Trajectories and origins of icebergs from 1978 to 2023. Iceberg nomenclature is based on the Antarctic quadrant where they were first identified, with sectors delineated counterclockwise as: Area A (0°–90°W), dark green lines; Area B (90°W–180°), light green lines; Area C (180°–90°E), pink lines; Area D (90°E–0°), deep red lines. Light yellow lines indicate icebergs of unknown origin. g. Iceberg impact levels on eleven penguin colonies: red for high impact, yellow for medium impact, and green for low impact. The background displays bathymetric features.
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