Haas, Christian; Pfaffling, Andreas; Hendricks, Stefan; Rabenstein, Lasse; Etienne, Jean-Louis; Rigor, Ignatius (2008): Helicopter-borne sea ice thickness measurements during cruises ARK-XX/2 and ARK-XXII/2 (SPACE) in the Arctic Ocean. PANGAEA, https://doi.org/10.1594/PANGAEA.778336, Supplement to: Haas, C et al. (2008): Reduced ice thickness in Arctic Transpolar Drift favors rapid ice retreat. Geophysical Research Letters, 35, L17501, https://doi.org/10.1029/2008GL034457
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Helicopter-borne electromagnetic sea ice thickness measurements were performed over the Transpolar Drift in late summers of 2001, 2004, and 2007, continuing ground-based measurements since 1991. These show an ongoing reduction of modal and mean ice thicknesses in the region of the North Pole of up to 53 and 44%, respectively, since 2001. A buoy derived ice age model showed that the thinning was mainly due to a regime shift from predominantly multi- and second-year ice in earlier years to first-year ice in 2007, which had modal and mean summer thicknesses of 0.9 and 1.27 m. Measurements of second-year ice which still persisted at the North Pole in April 2007 indicate a reduction of late-summer second-year modal and mean ice thicknesses since 2001 of 20 and 25% to 1.65 and 1.81 m, respectively. The regime shift to younger and thinner ice could soon result in an ice free North Pole during summer.
Median Latitude: 84.961700 * Median Longitude: -6.132949 * South-bound Latitude: 82.138900 * West-bound Longitude: -169.764610 * North-bound Latitude: 89.610478 * East-bound Longitude: 177.554060
Date/Time Start: 2004-07-28T00:00:00 * Date/Time End: 2007-09-18T12:33:17
HEM_ARK20_01 * Latitude Start: 83.004830 * Longitude Start: 0.079736 * Latitude End: 82.986820 * Longitude End: 0.018389 * Date/Time Start: 2004-07-28T00:00:00 * Date/Time End: 2004-07-28T00:00:00 * Location: Arctic Ocean * Campaign: ARK-XX/2 (PS66) * Basis: Polarstern * Device: Electro-magnetic Bird (EM-Bird) (EMB)
HEM_ARK20_02 * Latitude Start: 82.948360 * Longitude Start: 4.204838 * Latitude End: 82.463410 * Longitude End: 7.869373 * Date/Time Start: 2004-08-02T00:00:00 * Date/Time End: 2004-08-02T00:00:00 * Location: Arctic Ocean * Campaign: ARK-XX/2 (PS66) * Basis: Polarstern * Device: Electro-magnetic Bird (EM-Bird) (EMB)
HEM_ARK20_03 * Latitude Start: 83.088860 * Longitude Start: -4.752087 * Latitude End: 83.202600 * Longitude End: -6.861530 * Date/Time Start: 2004-08-03T00:00:00 * Date/Time End: 2004-08-03T00:00:00 * Location: Arctic Ocean * Campaign: ARK-XX/2 (PS66) * Basis: Polarstern * Device: Electro-magnetic Bird (EM-Bird) (EMB)