A 14-yr Circum-Antarctic Iceberg Calving Dataset Derived from Continuous Satellite Observations
- 1State Key Laboratory of Remote Sensing Science, and College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China
- 2School of Geospatial Engineering and Science, Sun Yat-Sen University, Zhuhai 519082, China
- 3Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai 519082, China
- 4Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, NY 12222, USA
- 5University Corporation for Polar Research, Beijing 100875, China
- 6State Key Laboratory of Geodesy and Earth's Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China
- 7University of Chinese Academy of Sciences, Beijing 100049, China
- 8China Academy of Space Technology, Qian Xuesen Laboratory, Beijing 100094, China
- These authors contributed equally to this work.
Abstract. Iceberg calving is the main process that facilitates the dynamic mass loss of ice sheets into the ocean, which accounts for approximately half of the net mass loss of all Antarctic ice shelves. Fine-scale calving variability observations can help reveal the involved calving mechanisms and identify the principal processes that influence how the changing climate affects the mass loss of ice sheets. Iceberg calving from specific ice shelves or regions has been monitored before, but there is still a lack of consistent, long-term and high-precision records on independent calving events for all Antarctic ice shelves. In this study, we developed a circum-Antarctic annual iceberg calving product measuring every independent calving event larger than 1 km2 that occurred from August 2005 to August 2019. We first simulated the expansion of the coastline according to ice velocity, and then manually delineated the calved areas, which are considered to be the differences between the simulated coastline and the actual coastline derived from the corresponding satellite imagery, based on 15 years of continuous multisource optical and synthetic aperture radar images. This product provides detailed information on each calving event, including the associated year of occurrence, area, size, average thickness, mass, recurrence interval, type, and measurement uncertainties. In total, 1786 annual calving events occurred on the Antarctic ice shelves from August 2005 to August 2019. The average annual calving area was measured as 3411.4 km2 with an uncertainty value of 17.1 km2, and the average calving rate was measured as 771.1 Gt/yr with an uncertainty value of 10.2 Gt/yr. The calving frequency, area, and mass fluctuated moderately during the first decade, followed by a dramatic increase from 2015/16 to 2018/19. During the dataset period, large ice shelves, such as the Ronne-Filchner, Ross and Amery Ice Shelves, advanced with low calving frequency, while small and medium-sized ice shelves retreated and calved more frequently. Iceberg calving is most prevalent in West Antarctica, followed by the Antarctic Peninsula and Wilkes Land in East Antarctica. The annual circum-Antarctic iceberg calving dataset provides consistent and precise calving observations with the longest time coverage. The dataset provides multidimensional variables for each independent calving event that can be used to study detailed spatiotemporal variations in Antarctic iceberg calving. The dataset can also be used to study ice sheet mass balance, calving mechanisms and the responses of iceberg calving to climate change. The dataset is shared via Global Change Data Repository (href="http://www.geodoi.ac.cn/WebEn/doi.aspx?Id=1516), and entitled
Annual iceberg calving dataset of the Antarctic ice shelves (2005–2019) with DOI: https://doi.org/10.3974/geodb.2020.04.09.V1.
Mengzhen Qi et al.
Status: final response (author comments only)
RC1: 'Comment on essd-2020-340', Mohammed Shokr, 03 Feb 2021
- AC1: 'Response to Professor Mohammed Shokr', Mengzhen Qi, 20 Apr 2021
CC1: 'Comment on essd-2020-340', Chad Greene, 17 Feb 2021
- AC2: 'Response to Professor Chad A. Greene', Mengzhen Qi, 20 Apr 2021
RC2: 'Comment on essd-2020-340', Anonymous Referee #2, 18 Feb 2021
- AC3: 'Response to Anonymous Referee #2', Mengzhen Qi, 20 Apr 2021
EC1: 'Comment on essd-2020-340', Tao Che, 18 Feb 2021
- AC4: 'Reply on EC1', Mengzhen Qi, 20 Apr 2021
Mengzhen Qi et al.
Annual iceberg calving dataset of the Antarctic ice shelves (2005-2019) https://doi.org/10.3974/geodb.2020.04.09.V1
Mengzhen Qi et al.
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