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• W3127407719 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> 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 mass loss of the Antarctic ice sheet. Fine-scale calving variability observations can help reveal the calving mechanisms and identify the principal processes that influence how the changing climate affects global sea level through the ice shelf buttressing effect on the Antarctic ice sheet. Iceberg calving from entire ice shelves for short time intervals or from specific ice shelves for long time intervals has been monitored before, but there is still a lack of consistent, long-term, and high-precision records on independent calving events for all of the Antarctic ice shelves. In this study, a 15-year annual iceberg calving product measuring every independent calving event larger than 1 <span class=inline-formula>km²</span> over all of the Antarctic ice shelves that occurred from August 2005 to August 2020 was developed based on 16 years of continuous satellite observations. First, the expansion of the ice shelf frontal coastline was simulated according to ice velocity; following this, the calved areas, which are considered to be the differences between the simulated coastline, were manually delineated, and the actual coastline was derived from the corresponding satellite imagery, based on multisource optical and synthetic aperture radar (SAR) images. The product provides detailed information on each calving event, including the associated year of occurrence, area, size, average thickness, mass, recurrence interval, and measurement uncertainties. A total of 1975 annual calving events larger than 1 <span class=inline-formula>km²</span> were detected on the Antarctic ice shelves from August 2005 to August 2020. The average annual calved area was measured as 3549.1 <span class=inline-formula>km²</span> with an uncertainty value of 14.3 <span class=inline-formula>km²</span>, and the average calving rate was measured as 770.3 <span class=inline-formula>Gt yr^−1</span> with an uncertainty value of 29.5 <span class=inline-formula>Gt yr^−1</span>. The number of calving events, calved area, and calved mass fluctuated moderately during the first decade, followed by a dramatic increase from 2015/2016 to 2019/2020. During the dataset period, large ice shelves, such as the Ronne–Filchner and Ross ice shelves, advanced with low calving frequency, whereas small- and medium-sized ice shelves retreated and calved more frequently. Iceberg calving of ice shelves is most prevalent in West Antarctica, followed by the Antarctic Peninsula and Wilkes Land in East Antarctica. The annual iceberg calving event dataset of Antarctic ice shelves provides consistent and precise calving observations with<span id=page4584/> the longest time coverage. The dataset provides multidimensional variables for each independent calving event that can be used to study detailed spatial–temporal variations in Antarctic iceberg calving. The dataset can also be used to study ice sheet mass balance, calving mechanisms, and responses of iceberg calving to climate change. The dataset, entitled “Annual iceberg calving dataset of the Antarctic ice shelves (2005–2020)”, is shared via the National Tibetan Plateau Data Center: <a href=https://doi.org/10.11888/Glacio.tpdc.271250>https://doi.org/10.11888/Glacio.tpdc.271250</a> (Qi et al., 2021). In addition, the average annual calving rate of <span class=inline-formula>18.4±6.7</span> <span class=inline-formula>Gt yr^−1</span> for calving events smaller than 1 <span class=inline-formula>km²</span> of the Antarctic ice shelves and the calving rate of <span class=inline-formula>166.7±15.2</span> <span class=inline-formula>Gt yr^−1</span> for the marine-terminating glaciers were estimated." @default.
• W3127407719 created "2021-02-15" @default.
• W3127407719 creator A5068483792 @default.
• W3127407719 date "2021-02-03" @default.
• W3127407719 modified "2023-09-26" @default.
• W3127407719 title "Comment on essd-2020-340" @default.
• W3127407719 doi "https://doi.org/10.5194/essd-2020-340-rc1" @default.
• W3127407719 hasPublicationYear "2021" @default.
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