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Summer extreme cyclone impacts on Arctic sea ice
Lukovich, J.V.; Stroeve, J.C.; Crawford, A.; Hamilton, L.; Tsamados, M.; Heorton, H.; Massonnet, F. (2021). Summer extreme cyclone impacts on Arctic sea ice. J. Clim. 34(12): 4817-4834. https://dx.doi.org/10.1175/JCLI-D-19-0925.1
In: Journal of Climate. American Meteorological Society: Boston, MA. ISSN 0894-8755; e-ISSN 1520-0442
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| Trefwoord |
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| Author keywords |
Arctic; Sea ice; Dynamics; Extreme events; Storm tracks; Thermodynamics |
| Auteurs | | Top |
- Lukovich, J.V.
- Stroeve, J.C.
- Crawford, A.
- Hamilton, L.
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- Tsamados, M.
- Heorton, H.
- Massonnet, F.
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| Abstract |
In this study the impact of extreme cyclones on Arctic sea ice in summer is investigated. Examined in particular are relative thermodynamic and dynamic contributions to sea ice volume budgets in the vicinity of Arctic summer cyclones in 2012 and 2016. Results from this investigation illustrate that sea ice loss in the vicinity of the cyclone trajectories during each year was associated with different dominant processes: thermodynamic processes (melting) in the Pacific sector of the Arctic in 2012, and both thermodynamic and dynamic processes in the Pacific sector of the Arctic in 2016. Comparison of both years further suggests that the Arctic minimum sea ice extent is influenced by not only the strength of the cyclone, but also by the timing and location relative to the sea ice edge. Located near the sea ice edge in early August in 2012, and over the central Arctic later in August in 2016, extreme cyclones contributed to comparable sea ice area (SIA) loss, yet enhanced sea ice volume loss in 2012 relative to 2016. Central to a characterization of extreme cyclone impacts on Arctic sea ice from the perspective of thermodynamic and dynamic processes, we present an index describing relative thermodynamic and dynamic contributions to sea ice volume changes. This index helps to quantify and improve our understanding of initial sea ice state and dynamical responses to cyclones in a rapidly warming Arctic, with implications for seasonal ice forecasting, marine navigation, coastal community infrastructure, and designation of protected and ecologically sensitive marine zones. |
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