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A new climate model (ECHAM5/MPI-OM1) developed for the fourth assessment report of the Intergovernmental Panel on Climate Change (IPCC) at Max-Planck Institute for Meteorology is used to study the climate changes under the different increased CO2 scenarios (B1, A1B and A2) . Changes of sea level due to increased CO2 in the atmosphere play an important role in the future climate domain. In this paper, the new climate model is used to study the variation of sea level, especially. Based on the corresponding model results, the sea surface temperature and salinity structure, changes of sea ice in the north hemisphere and sea level variation, are analyzed. It is concluded that from 2000 to 2100, under B1, AlB and A2 scenarios, the global mean sea surface temperatures (SST) increase by 1.9°C, 2.7°C and 3.TC respectively, especially in the region of Arctic, the increase of SST is even above 10.0°C ; the maximal negative value of the variation of the fresh water flux is located in the subtropical oceans, while the precipitation in the eastern subtropical Pacific increases. In the north hemisphere, the area of sea ice cover decreases by about 50% under AlB scenario. The global mean sea level increases by 0.27m, 0.345m. and 0.375m under B1, A1B and A2 scenarios. The global mean, sea level rise due to thermal expansion is 0.19m, 0.255m and 0.265m respectively, and sea level, rise due to ice melting is 0.08m, 0.09m and 0.11m. For the 21st century, relative to the 20th century, local extreme amplitudes of regional, sea level change range from -0.18m to +0.95m. Copyright © 2010 by The International Society of Offshore and Polar Engineers (ISOPE).
