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The drift of a floe near the North Pole (87°N, 175°W) was observed from the 8th to the 19th August 2010 during the fourth Chinese National Arctic Research Expedition (CHINARE).The trajectory of the floe showed circular motions superimposed on straight drift.Each cycle had a period of about 12 hours.The circular motion is inertial oscillation.The largest amplitude inertial oscillation speed can reach 20 cm/s.After removing the inertial oscillation, the floe drift direction is 40° on average to the right of the observed 10-m wind, and floe drift moves with a speed of about 1.4% of the observed 10-m wind speed throughout the whole observation period.A simple dynamic sea ice-ocean coupled model and a three-dimensional sea ice-ocean coupled model are used to simulate the floe drift.Both of the two models use the widely used quadratic water-drag formulation, i.e., the stress is proportional to the square of the ice velocity relative to the ocean surface current.The inertial oscillation of the floe is successfully simulated by the simple passive drag model.But the floe drift amplitudes simulated by the three-dimensional model are too small.