Preprints
https://doi.org/10.5194/tc-2020-211
https://doi.org/10.5194/tc-2020-211

  25 Aug 2020

25 Aug 2020

Review status: a revised version of this preprint was accepted for the journal TC and is expected to appear here in due course.

Seasonal changes in sea ice kinematics and deformation in the Pacific Sector of the Arctic Ocean in 2018/19

Ruibo Lei1, Mario Hoppmann2, Bin Cheng3, Guangyu Zuo1,4, Dawei Gui1,5, Qiongqiong Cai6, H. Jakob Belter2, and Wangxiao Yang4 Ruibo Lei et al.
  • 1Key Laboratory for Polar Science of the MNR, Polar Research Institute of China, Shanghai, China
  • 2Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
  • 3Finnish Meteorological Institute, Helsinki, Finland
  • 4College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan, China
  • 5Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan, China
  • 6National Marine Environmental Forecasting Center of the MNR, Beijing, China

Abstract. Arctic sea ice kinematics and deformation play significant roles in heat and momentum exchange between atmosphere and ocean. However, mechanisms regulating their changes at seasonal scales remain poorly understood. Using position data of 32 buoys in the Pacific sector of the Arctic Ocean (PAO), we characterized spatiotemporal variations in ice kinematics and deformation for autumn–winter 2018/19. In autumn, sea ice drift response to wind forcing and inertia were stronger in the southern and western than in the northern and eastern parts of the PAO. These spatial heterogeneities decreased gradually from autumn to winter, in line with the seasonal evolution of ice concentration and thickness. Areal localization index decreased by about 50 % from autumn to winter, suggesting the enhanced localization of intense ice deformation as the increased ice mechanical strength. In winter 2018/19, a highly positive Arctic Dipole and a weakened high pressure system over the Beaufort Sea led to a distinct change in ice drift direction and an temporary increase in ice deformation. During the freezing season, ice deformation rate in the northern part of the PAO was about 2.5 times that in the western part due to the higher spatial heterogeneity of oceanic and atmospheric forcing in the north. North–south and east–west gradients in sea ice kinematics and deformation of the PAO observed in autumn 2018 are likely to become more pronounced in the future as sea ice losses at higher rates in the western and southern than in the northern and western parts.

Ruibo Lei et al.

 
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Status: closed
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Ruibo Lei et al.

Data sets

Sea ice drifter data of CHINARE-2018 Ruibo Lei https://doi.org/10.11856/NNS.D.2020.038.v0

Ruibo Lei et al.

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Short summary
Quantification of ice deformation is useful for understanding of the role of ice dynamics in climate change. Using data of 32 buoys, we characterized spatiotemporal variations in ice kinematics and deformation in the Pacifica sector of Arctic Ocean for autumn–winter 2018/19. Sea ice in the south and west has stronger mobility than in the east and north, which weaken from autumn to winter. Enhanced Arctic Dipole and weakened Beaufort Gyre in winter lead to an obvious turning of ice drifting.