The missing Northern European winter cooling response to Arctic sea ice loss

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Screen, James A. (2017)

Reductions in Arctic sea ice may promote the negative phase of the North Atlantic Oscillation (NAO−). It has been argued that NAO-related variability can be used an as analogue to predict the effects of Arctic sea ice loss on mid-latitude weather. As NAO− events are associated with colder winters over Northern Europe, a negatively shifted NAO has been proposed as a dynamical pathway for Arctic sea ice loss to cause Northern European cooling. This study uses large-ensemble atmospheric simulations with prescribed ocean surface conditions to examine how seasonal-scale NAO− events are affected by Arctic sea ice loss. Despite an intensification of NAO− events, reflected by more prevalent easterly flow, sea ice loss does not lead to Northern European winter cooling and daily cold extremes actually decrease. The dynamical cooling from the changed NAO is ‘missing', because it is offset (or exceeded) by a thermodynamical effect owing to advection of warmer air masses.
  • References (70)
    70 references, page 1 of 7

    Stocker T. F.. Climate Change 2013: The Physical Science Basis IPCC, Cambridge Univ. Press (2013).

    Stroeve J., Holland M. M., Meier W., Scambos T. & Serreze M. Arctic sea ice decline: faster than forecast. Geophys. Res. Lett. 34, L09501 (2007).

    Min S.-K., Zhang X., Zwiers F. W. & Agnew T. Human influence on Arctic sea ice detectable from early 1990s onwards. Geophys. Res. Lett. 35, L21701 (2008).

    Notz D. & Marotzke J. Observations reveal external driver for Arctic sea ice retreat. Geophys. Res. Lett. 39, L08502 (2012).

    Boe J., Hall A. & Qu X. September sea ice cover in the Arctic Ocean projected to vanish by 2100. Nat. Geosci. 2, 341–343 (2009).

    Mahlstein I. & Knutti R. September Arctic sea ice predicted to disappear near 2°C global warming above present. J. Geophys. Res. 117, D06104 (2012).

    Overland J. E. & Wang M. When will the summer Arctic be nearly sea ice free? Geophys. Res. Lett. 40, 2097–2101 (2013).

    Jahn A., Kay J. E., Holland M. M. & Hall D. M. How predictable is the timing of a summer ice-free Arctic? Geophys. Res. Lett. 43, 9113–9120 (2016).

    Cohen J.. Recent Arctic amplification and extreme mid-latitude weather. Nat. Geosci.7, 627–637 (2014).

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    Inferred
    Arctic Sea Ice (2016)
    46%
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