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Linkages between Arctic summer circulation regimes and regional sea ice anomalies

Lynch, AH; Serreze, MC; Cassano, EN; Crawford, AD; Stroeve, J; (2016) Linkages between Arctic summer circulation regimes and regional sea ice anomalies. Journal of Geophysical Research: Atmospheres , 121 (13) pp. 7868-7880. 10.1002/2016JD025164. Green open access

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Abstract

The downward trend in overall Arctic summer sea ice extent has been substantial, particularly in the last few decades. Departures in ice extent from year to year can be very large, however, in part due to the high variability in summer atmospheric circulation patterns. Anomalies in the Pacific sector ice cover can be partially compensated by anomalies of opposite sign in the Atlantic sector. An assessment of linkages between summer atmospheric patterns and sectoral anomalies in the area of maximum open water north of 70°N demonstrates that there is asymmetry in the mechanisms. Years with low ice extent and high open water fraction are uniformly associated with positive temperature anomalies and southerly flow in both the Atlantic and Pacific sectors. However, years with high extent and low open water fraction in both sectors reveal two dominant mechanisms. Some years with anomalously low maximum open water fraction are associated with negative temperature anomalies and southerly transport—a cool summer pattern that allows ice to persist over larger areas. However, other low open water years are characterized by an “ice factory” mechanism, whereby—even when melting—ice cover is continually replenished by advection from the north.

Type: Article
Title: Linkages between Arctic summer circulation regimes and regional sea ice anomalies
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/2016JD025164
Publisher version: http://doi.org/10.1002/2016JD025164
Language: English
Additional information: © 2016. American Geophysical Union. All Rights Reserved. This is the peer reviewed version of the following article: Lynch, AH; Serreze, MC; Cassano, EN; Crawford, AD; Stroeve, J; (2016) Linkages between Arctic summer circulation regimes and regional sea ice anomalies. Journal of Geophysical Research: Atmospheres , 121 (13) pp. 7868-7880, which has been published in final form at http://doi.org/10.1002/2016JD025164. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Keywords: Science & Technology, Physical Sciences, Meteorology & Atmospheric Sciences, Arctic sea ice, Arctic circulation regimes, self-organizing maps, WIND EVENTS, POLAR LOWS, ALASKA, BARROW, VARIABILITY, CLIMATOLOGY, PERFORMANCE, CONTEXT, MOTION
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1520428
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