Evidence of Arctic sea ice thinning from direct observations

• Published in: Geophysical research letters Vol. 41; no. 14; pp. 5029 - 5036
• Main Authors: Renner, Angelika H. H., Gerland, Sebastian, Haas, Christian, Spreen, Gunnar, Beckers, Justin F., Hansen, Edmond, Nicolaus, Marcel, Goodwin, Harvey
• Format: Journal Article
• Language: English
• Published: Washington Blackwell Publishing Ltd 28.07.2014; John Wiley & Sons, Inc
• Subjects: Arctic; Assessments; Climate change; Fram Strait; Geophysics; Global warming; Ice; Ice cover; Ice thickness; In situ measurement; International trade; Marine; Oceans; Sea ice; sea ice thickness; Straits; Thinning; Time series
• ISSN: 0094-8276; 1944-8007
• DOI: 10.1002/2014GL060369

The Arctic sea ice cover is rapidly shrinking, but a direct, longer‐term assessment of the ice thinning remains challenging. A new time series constructed from in situ measurements of sea ice thickness at the end of the melt season in Fram Strait shows a thinning by over 50% during 2003–2012. The modal and mean ice thickness along 79°N decreased at a rate of 0.3 and 0.2 m yr−1, respectively, with long‐term averages of 2.5 and 3 m. Airborne observations reveal an east‐west thickness gradient across the strait in spring but not in summer due to advection from more different source regions. There is no clear relationship between interannual ice thickness variability and the source regions of the ice. The observed thinning is therefore likely a result of Arctic‐wide reduction in ice thickness with a potential shift in exported ice types playing a minor role. Key Points We present a time series of sea ice thickness in Fram Strait from in situ data Fram Strait sea ice thickness has decreased by over 50% in 2003–2012 The thinning independent from the source region indicates Arctic‐wide decline