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标题：Lagrangian analysis of sea-ice dynamics in the Arctic Ocean
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作者：Sándor Szanyi ; Jennifer V. Lukovich ; David G. Barber 等
期刊名称：Polar Research
印刷版ISSN：1751-8369
出版年度：2016
卷号：35
期号：1
页码：30778
DOI：10.3402/polar.v35.30778
语种：English
出版社：Co-Action Publishing
摘要：Abstract In this study, we present Lagrangian diagnostics to quantify changes in the dynamical characteristics of the Arctic sea-ice cover from 2006 to 2014. Examined in particular is the evolution in finite-time Lyapunov exponents (FTLEs), which monitor the rate at which neighbouring particle trajectories diverge, and stretching rates throughout the Arctic. In this analysis, we compute FTLEs for the Arctic ice-drift field using the 62.5 km daily sea-ice motion vector data from the European Organisation for the Exploitation of Meteorological Satellites Ocean and Sea Ice Satellite Application Facility. Results from the FTLE analysis highlight the existence of three distinct dynamical regions with strong stretching, captured by FTLE maxima or ridges. It is further shown that FTLE ridges are dominated by shear, with contributions from divergence in the Beaufort Sea. Localization of FTLE features following the 2012 record minimum in summertime sea-ice extent illustrates the emergence of an Arctic characterized by increased mixing. Results also demonstrate higher FTLEs in years when lower multi-year ice extent is observed.
关键词：sea-ice dynamics ; FTLE ; Arctic Ocean ; Lagrangian diagnostics ; LAD