An ice sheet is ashore, there is sea ice in earth top north-south two poles at sea, and those generation change is directly linked with the climate change of an earth scale. For this reason, in connection with warming, an ice sheet and sea ice react sensitively, and we dissolve, or are anxious about affecting still wide range climate and sea surface change. So, into this group, the atmosphere / ocean / sea ice / ice sheet joint model which finally works on an Earth Simulator are built, and the prediction experiment of global warming or sea surface change is conducted. First, it strives for grasp of an indefinite element through various sensitivity experiments, improving a partial model. Furthermore, it aims at raising the accuracy of a prediction experiment, conducting the reappearance experiment of the present or the past using the combined model.
The mass of an ice sheet was decided by the dynamics process of ice sheets, such as snowfall, flow modification of the ice of an inside besides the interaction of dissolution and the atmosphere called a re-freeze, and a bottom slide. If influenced by warming, an ice sheet will receive the negative feed back (mechanism which presses down the mass loss as the whole ice sheet) by the increase in snowfall, or modification of ice, or it not only dissolves, but will receive the positive feedback to the temperature and dissolution by area or advanced fall conversely. Moreover, the increase in water, change of ice temperature, and a flow and change of a bottom slide that were dissolved bring positive or negative feed back to ice sheet change. So, it is necessary to consist of a climate model which calculates precipitation, temperature, radiation, etc., a surface mass income-and-outgo model which calculates the amount of dissolution etc., and an ice sheet dynamics model which predicts a flow, bottom slide, and form of an ice sheet, and since they are closely related, it is necessary to combine with prediction of ice sheet change. Since manufacture of a partial model was briefly performed by the current fiscal year, improve each portion or the parallelization optimization of the ice sheet model program is carried out for Earth Simulators, or a coupling agent is developed and the characteristic of combination of a climate model and an ice sheet dynamics model is investigated from now on. Moreover, since the past climate and the restoration of ice sheet change / sea level by the data of a seabed sediment or geographical feature have come to be considerably performed with high precision about the last glacial epoch or subsequent ones 20,000 years ago, the model is verified through trying the numerical simulation reproducing this.
sea ice -- more -- accuracy -- it is required to search for distribution of area, thickness, closeness, etc. highly. Since the sea ice model is developed in the form already combined with the atmosphere/oceanographic model, verification by the sensitivity experiment investigation for grasp of the behavior as coupled systems and observational data is performed with highly precise-ization of a sea ice partial model from now on. since the efficiency and salt removal process of heat exchange between the atmosphere/ocean are markedly alike and change with thickness, especially sea ice is planning examining the elaboration of a sea ice thermodynamics portion. Observation research of symbiosis 3 stays in touch closely, and incorporation of a more realistic and essential process is performed.