| Abstrakt: |
We generate a high spatial and temporal record of ice loss across glaciers globally for the first time from CryoSat‐2 swath interferometric radar altimetry. We show that between 2010 and 2020, glaciers lost a total of 272 ± 11 Gt yr−1 of ice, equivalent to a loss of 2% of their total volume during the 10‐year study period. Using a simple parameterization, we demonstrate that during this period, surface mass balance anomaly dominated the mass budget, accounting for 89% ± 5% of the total ice loss. Ice discharge anomaly was responsible for 11% ± 1% of the total ice loss, and 28% ± 2% of the ice loss when excluding land‐terminating sectors. Strong discharge anomaly is found over areas of changing oceanic conditions such as in the Barents and Kara Seas or in Antarctica, and areas fringed by lakes and fjords in Patagonia. Plain Language Summary: Glaciers outside the two ice sheets are currently the largest contributor to sea level rise. Global monitoring of these regions is a challenging task, few estimates exist and significant differences remain between these estimates. This study provides the first ever assessment of glacier mass loss globally from satellite radar altimetry, showing that glaciers have lost 2% of their volume between 2010 and 2020. In addition, for the first time, the study gives a global picture of the drivers of this glacier ice loss. The findings indicate that globally nearly 90% of all the loss in ice is due to interaction with the atmosphere, and that the ocean drives 10% of the loss. However, in regions where the ocean is changing rapidly, such as the Barents and Kara Seas or around Antarctica, ocean interaction is responsible for the majority of the ice loss. Key Points: Glaciers lose 2720 Gigatonnes of ice between 2010 and 2020, 2% of their total volumeAtmospheric forcing is responsible for 89% of global glacier mass lossIncreasing ice discharge accounts for over 50% of mass loss in the Barents and Kara seas, Patagonia, and Antarctic Periphery [ABSTRACT FROM AUTHOR] |
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