17:15 〜 18:45
[ACG34-P02] Development of a numerical scheme for regridding between polar-stereographic projection ice-sheet model and geographic climate model
キーワード：氷床モデル
Ice sheet evolution is often described as responses to variation of other climate systems such as atmosphere and ocean, however, it is well known that there is interaction between the systems and the changes in ice-sheet do feedback on the other systems. Therefore development of coupling models, which simulate the climate components simultaneously, is an important subject in order to compute the evolution of ice-sheet with high accuracy.
The model domain of global climate models is typically defined on geographic (longitude-latitude) grid system on a (true) sphere, while that of ice-sheet component is typically defined on regional cartesian grid on the polar stereographic projection of an ellipsoid. Exchanges of information between climate and ice-sheet models such as the surface mass balance require a function to absorb the difference of the model structures and, in particular, not to break the conservation. In addition, as already discussed by Fischer et al. (2014), the different structure of the models may cause the projection errors and geometric errors.
In this study, the module adopted in the climate model MIROC to exchange the information between the atmosphere and ocean components (Suzuki et al. 2009) is extended to work with the polar stereographic projection, which uses tiny spherical segments as a unit of the overlaping area. It is further extended by introducing the idea of Takeshima (2020) or Fischer et al. (2014), which computes overwrapping area of both models using spherical polygons.
In the present study, the peformance of the library will be presented in terms of numerical efficiency and also influence of the projection errors and geometric errors on ice-sheet simulation.
The model domain of global climate models is typically defined on geographic (longitude-latitude) grid system on a (true) sphere, while that of ice-sheet component is typically defined on regional cartesian grid on the polar stereographic projection of an ellipsoid. Exchanges of information between climate and ice-sheet models such as the surface mass balance require a function to absorb the difference of the model structures and, in particular, not to break the conservation. In addition, as already discussed by Fischer et al. (2014), the different structure of the models may cause the projection errors and geometric errors.
In this study, the module adopted in the climate model MIROC to exchange the information between the atmosphere and ocean components (Suzuki et al. 2009) is extended to work with the polar stereographic projection, which uses tiny spherical segments as a unit of the overlaping area. It is further extended by introducing the idea of Takeshima (2020) or Fischer et al. (2014), which computes overwrapping area of both models using spherical polygons.
In the present study, the peformance of the library will be presented in terms of numerical efficiency and also influence of the projection errors and geometric errors on ice-sheet simulation.