Comparison of seasonal sea-ice thickness change in the Transpolar Drift observed by local ice mass-balance observations andfloe-scale EM surveys | Tara, un voilier pour la planète

Comparison of seasonal sea-ice thickness change in the Transpolar Drift observed by local ice mass-balance observations andfloe-scale EM surveys

© G.Redvers/Tara Expeditions

Tara Arctic

Christian HAAS, Herve LE GOFF, Samuel AUDRAIN, Don PEROVICH, Jari HAAPALA

Annals of Glaciology 52(57), 2011, p.97-102.

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Abstract

Local and transect ice-thickness measurements were performed between May andNovember 2007 on an ice floe in the Transpolar Drift of the Arctic Ocean using an ice mass-balancebuoy and electromagnetic induction (EM) sounding. Repeated EM surveys along an originally 2160mlong profile including level and deformed ice showed that between June and September modal andmean thicknesses decreased by 0.6 and 0.86m respectively. The modal thickness decrease is in goodagreement with the thinning of 0.6m observed by the ice mass-balance buoy at one location onunponded ice during the same period, although the local observations do not capture the different meltrates on level and rough ice. The paper discusses methodological and operational challenges insustaining both measurements over periods of several months, and concludes that more work needs tobe done to better understand their representativeness.