气候变化领域集成服务门户(CCPortal): Increased snowfall over the Antarctic Ice Sheet mitigated twentieth-century sea-level rise

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DOI	10.1038/s41558-018-0356-x
	Increased snowfall over the Antarctic Ice Sheet mitigated twentieth-century sea-level rise
	Medley B.; Thomas E.R.
发表日期	2019
ISSN	1758678X
卷号	9 期号:1
英文摘要	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. © 2018, This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply.
语种	英语
来源期刊	Nature Climate Change
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124487
作者单位	Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States; British Antarctic Survey, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Medley B.,Thomas E.R.. Increased snowfall over the Antarctic Ice Sheet mitigated twentieth-century sea-level rise[J],2019,9(1).
APA	Medley B.,&Thomas E.R..(2019).Increased snowfall over the Antarctic Ice Sheet mitigated twentieth-century sea-level rise.Nature Climate Change,9(1).
MLA	Medley B.,et al."Increased snowfall over the Antarctic Ice Sheet mitigated twentieth-century sea-level rise".Nature Climate Change 9.1(2019).