Linked trends in the South Pacific sea ice edge and Southern Oscillation Index

Kwok, R.; Comiso, J.C.; Lee, T.; Holland, P.R. ORCID: https://orcid.org/0000-0001-8370-289X. 2016 Linked trends in the South Pacific sea ice edge and Southern Oscillation Index. Geophysical Research Letters, 43 (19). 10,295-10,302. https://doi.org/10.1002/2016GL070655

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Abstract/Summary

Previous work have shown that sea ice variability in the South Pacific is associated with extratropical atmospheric anomalies linked to the Southern Oscillation (SO). Over a 32 year period (1982–2013), our study shows that the trend in Southern Oscillation Index (SOI) is also able to quantitatively explain the trends in sea ice edge, drift, and surface winds in this region. On average two thirds of the winter ice edge trend in this sector, linked to ice drift and surface winds, could be explained by the positive SOI trend, thus subjecting the ice edge to strong decadal SO variability. If this relationship holds, the negative SOI trend prior to the recent satellite era suggests that ice edge trends opposite to that of the recent record over a similar time scale. Significant low-frequency ice edge trends, linked to the natural variability of SO, are superimposed upon any trends expected of anthropogenic forcing.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1002/2016GL070655
Programmes:	BAS Programmes > BAS Programmes 2015 > Polar Oceans
ISSN:	00948276
Additional Keywords:	Antarctic ice edge, Southern Oscillation
Date made live:	28 Nov 2016 09:46 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/515246

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