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- W2903985268 abstract "Changes in accumulated snowfall over the Antarctic Ice Sheet have an immediate and time-delayed impact on global mean sea level. The immediate impact is due to the instantaneous change in freshwater storage over the ice sheet, whereas the time-delayed impact acts in opposition through enhanced ice-dynamic flux into the ocean1. Here, we reconstruct 200 years of Antarctic-wide snow accumulation by synthesizing a newly compiled database of ice core records2 using reanalysis-derived spatial coherence patterns. The results reveal that increased snow accumulation mitigated twentieth-century sea-level rise by ~10 mm since 1901, with rates increasing from 1.1 mm decade−1 between 1901 and 2000 to 2.5 mm decade−1 after 1979. Reconstructed accumulation trends are highly variable in both sign and magnitude at the regional scale, and linked to the trend towards a positive Southern Annular Mode since 19573. Because the observed Southern Annular Mode trend is accompanied by a decrease in Antarctic Ice Sheet accumulation, changes in the strength and location of the circumpolar westerlies cannot explain the reconstructed increase, which may instead be related to stratospheric ozone depletion4. However, our results indicate that a warming atmosphere cannot be excluded as a dominant force in the underlying increase. Ice loss from Antarctica contributes to global sea-level rise. Analysis of ice core records and reanalysis datasets reveals that increased snowfall over the Antarctic Ice Sheet has offset contemporary sea-level rise by ~10 mm since 1901." @default.
- W2903985268 created "2018-12-22" @default.
- W2903985268 creator A5066249334 @default.
- W2903985268 creator A5079872063 @default.
- W2903985268 date "2018-12-10" @default.
- W2903985268 modified "2023-10-13" @default.
- W2903985268 title "Increased snowfall over the Antarctic Ice Sheet mitigated twentieth-century sea-level rise" @default.
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- W2903985268 doi "https://doi.org/10.1038/s41558-018-0356-x" @default.
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