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Sci Rep. 2019 Jun 25;9(1):9222. doi: 10.1038/s41598-019-45574-5.

Winter storms accelerate the demise of sea ice in the Atlantic sector of the Arctic Ocean.

Author information

1
Norwegian Polar Institute, Fram Centre, Tromsø, Norway. Robert.Graham@npolar.no.
2
Norwegian Polar Institute, Fram Centre, Tromsø, Norway. Polona.Itkin@uit.no.
3
Norwegian Polar Institute, Fram Centre, Tromsø, Norway.
4
ARC Centre of Excellence for Climate Extremes, IMAS University of Tasmania, Hobart, Australia.
5
Institute of Environmental Physics, University of Bremen, Bergen, Germany.
6
Geophysical Institute, University of Bergen, Bergen, Norway.
7
Bjerknes Centre for Climate Research, Bergen, Norway.
8
Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, Colorado, USA.
9
Finnish Meteorological Institute, Helsinki, Finland.
10
UiT The Arctic University of Norway, Tromsø, Norway.
11
Laboratoire LOCEAN-IPSL, Sorbonne Universités, UPMC, Univ. Paris 6, CNRS-IRD-MNHN, Paris, France.
12
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, Germany.
13
Washington State University, Department of Civil and Environmental Engineering, Pullman, Washington, USA.
14
Norwegian Polar Institute, Fram Centre, Tromsø, Norway. Mats.Granskog@npolar.no.

Abstract

A large retreat of sea-ice in the 'stormy' Atlantic Sector of the Arctic Ocean has become evident through a series of record minima for the winter maximum sea-ice extent since 2015. Results from the Norwegian young sea ICE (N-ICE2015) expedition, a five-month-long (Jan-Jun) drifting ice station in first and second year pack-ice north of Svalbard, showcase how sea-ice in this region is frequently affected by passing winter storms. Here we synthesise the interdisciplinary N-ICE2015 dataset, including independent observations of the atmosphere, snow, sea-ice, ocean, and ecosystem. We build upon recent results and illustrate the different mechanisms through which winter storms impact the coupled Arctic sea-ice system. These short-lived and episodic synoptic-scale events transport pulses of heat and moisture into the Arctic, which temporarily reduce radiative cooling and henceforth ice growth. Cumulative snowfall from each sequential storm deepens the snow pack and insulates the sea-ice, further inhibiting ice growth throughout the remaining winter season. Strong winds fracture the ice cover, enhance ocean-ice-atmosphere heat fluxes, and make the ice more susceptible to lateral melt. In conclusion, the legacy of Arctic winter storms for sea-ice and the ice-associated ecosystem in the Atlantic Sector lasts far beyond their short lifespan.

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