The Numerical Simulation Of Interannual Variation Of Sea Ice In Arctic

The interaction between atmosphere, sea ice and ocean is an very important aspect of the climate change. In the thesis, the interannual variation of the sea ice and general oceanic circulation from 1970 in the Arctic and the northern Atlantic is simulated and the relationship with the climate change is analyzed .A coupled ice-ocean model is used for the pan-Arctic and northern North Atlantic Ocean based on a full thermodynamical and dynamical sea ice model with plastic-viscous rheology and the multi-category of sea ice thickness distribution, while the oceanic component is Princeton Ocean Model (POM).The model is driven by the 6 hourly atmosphere fields from the 35-year NCEP reanalysis (1970-2004), which is on the basis of the climatological sea ice and ocean in Arctic by Wang et al.. The analytical average monthly of sea ice and ocean elements during the 35 years reveals that: From 1970s, the trend of Arctic sea ice is decrease. The 30-year mean and recent decade reductions of sea ice area are about 4% and 4.5% respectively. It closes to the observational data (from 1978 to 2004) have revealed reductions by about 3.5% and 4%. Correspondingly, a mean decrease of 1.0m in sea ice thickness from 1970s to 1990s. The simulated general circulation in Canada Basin is strong anticyclonic ocean surface current, and there is a Transpolar Drift Stream (TDS). Their speeds are 2-5cm/s and stronger in winter than in summer. There is a low salinity in Canada Basin. The results of the model reproduce the feature of the Arctic sea ice and the general oceanic circulation.Through the analysis of the simulation, it is found new opinion: Compared with 1970s and 1980s, the area of sea ice is dramatically decrease in the Arctic during...