Abstract:

Based on the field data acquired in the program of fast-ice observation off Zhongshan Station,Antarctica during the austral summer 2005/2006,physical properties evolution of fast-ice during the ice ablation duration has been analyzed in detail.Results show that the annual maximum ice thickness in 2005 occurred in later November,then started to melt,and the ablation duration was 62 days;sea water under the ice became warm in summer,so sea water temperature raised fleetly;corresponding to the warming of sea water and the strengthening of solar shortwave radiation,sea ice temperature raised gradually,and a "relative cold mid-layer" appeared in sea ice;under the thermodynamics and dynamics force,the fast-ice marginal line recoiled back to the shore fleetly,and the recoil distance was 20.9 km from December 18,2005 to January 14,2006.In addition,based on the data of sea ice thickness survey along the investigation route on December 18 of 2005,some ice thickness distribution characteristics in the marginal ice zone have been found: sea ice thickness increased from open water to fast ice zone distinctly;the diversity of floe ice thickness decreased from open water to fast ice zone gradually.