Instability of the Northeast Greenland Ice Stream over the last 45,000 years

Citeable URL: https://ir.library.oregonstate.edu/concern/articles/vx021m25r

Descriptions

Attribute Name	Values
Creator	Larsen, Nicolaj K. Levy, Laura B. Carlson, Anders E. Buizert, Christo Olsen, Jesper Strunk, Astrid Bjork, Anders A. Skov, Daniel S.
Abstract	The sensitivity of the Northeast Greenland Ice Stream (NEGIS) to prolonged warm periods is largely unknown and geological records documenting such long-term changes are needed to place current observations in perspective. Here we use cosmogenic surface exposure and radiocarbon ages to determine the magnitude of NEGIS margin fluctuations over the last 45 kyr (thousand years). We find that the NEGIS experienced slow early Holocene ice-margin retreat of 30-40 m a(-1), likely as a result of the buttressing effect of sea-ice or shelf-ice. The NEGIS was similar to 20-70 km behind its present ice-extent similar to 41-26 ka and similar to 7.8-1.2 ka; both periods of high orbital precession index and/or summer temperatures within the projected warming for the end of this century. We show that the NEGIS was smaller than present for approximately half of the last similar to 45 kyr and is susceptible to subtle changes in climate, which has implications for future stability of this ice stream.
License	Attribution 4.0 (CC BY 4.0)
Resource Type	Article
DOI	https://doi.org/10.1038/s41467-018-04312-7
Date Issued	2018-05-14
Journal Title	Nature Communications
Journal Volume	9
权利声明	In Copyright
Language	English [eng]
ISSN	2041-1723