4 Plan for FY2003

These each is connected to a physical climate system model (the existing thing developed by the model centering on the "physical" process of the atmosphere, the ocean, and land and CCSR/NIES is used), continuing and furthering [ pull, ] development (atmospheric composition, terrestrial ecosystem carbon cycle, etc.)of an individual model currently performed in each area of investigation of the Frontier Research System for Global Change now, and the work which makes a "partial integrated model" is continued.

(1) A carbon cycle model, a carbon cycle and a climatic change joint model subgroup

The work which combines a sea carbon cycle model and a terrestrial carbon cycle model with the air sea joint climate model MIROC is started during the current fiscal year. About the sea component, combination with an ecosystem model with four simple ingredients and an oceanic circulation model is completed mostly. About a terrestrial component, inclusion to the climate model of Sim-CYCLE under development is started by the Frontier Research System for Global Change at the beginning of FY 2003. Integration of the land process model MATSIRO and Sim-CYCLE is also performed. Moreover, in order to be anxious about vegetation distribution changing with warming sharply about a subarctic forest, development of the vegetation dynamic model which specialized in the subarctic forest towards Sim-CYCLE extension is begun. Before including in MIROC, it is necessary to fully perform examination of the performance in each component model simple substance.

(2) Warming and an atmospheric composition change interaction model subgroup

(1) Warming and an atmospheric composition change interaction model

The troposhere chemistry model CHASER developed in the University of Tokyo climate center is extended, a stratosphere chemical reaction is incorporated, and high resolution time slice simulation is performed. However, CHASER needs to examine in what resolution it experiments concretely, actually working a model on an Earth Simulator from now on, in order to require a lot of computer resources including very many variables. Since the standpoint of reappearance of circulating space important for a chemical process is also needed for the determination of resolution, it gropes for the resolution which balance was able to take most united with the physical climate core model improvement subgroup. Moreover, the improvement of an advection current scheme is also tackled in parallel to these activities.

(2) A warming-cloud, aerosol, and radiation feedback precision evaluation

Towards a handling improvement of the aerosol in GCM, if substances differ, consideration of the effect which changes the ease of forming of a cloud particle a lot will be considered. The model result of resolution higher than GCM is also used. I want to cooperate also with other subjects (advancement of parameterization of many physics process (the atmosphere and the sea field)) of a symbiosis project, or a model integration domain.

(3) Chill area model subgroup

Verification through observational data or a paleoclimate reappearance experiment is performed, and it strives for highly precise-ization of the ice sheet model developed in the climate center, and the sea ice model introduced into MIROC. Moreover, observation research of other subjects (advancement of parameterization of many physics process (the atmosphere and the sea field)) of a symbiosis project stays in touch, and the prospective improvement of a sea ice model is considered.

(4) Physical climate core model improvement subgroup

in order to reproduce the atmospheric chemistry process in the stratosphere actually, removal of the fault of the low temperature and the excess of steam in the lower stratosphere looked at by the present model and the reappearance of QBO in the low latitude stratosphere can call it a necessary condition. It gropes for the resolution of a model which balance which is equal to actual use also from the field of calculation cost was able to take, fulfilling such conditions. In formation of stratosphere atmospheric circulation, the internal gravity wave has played the important role, and I want to analyze about both the ingredient explicitly expressed by a model, and the ingredient by which a parameter rise is carried out. It is expected that the work which updates the perpendicular coordinate system of a model from the conventional sigma coordinate system to a sigma-P hybrid coordinate system will also be to be done in parallel, and its reproducibility of circulation near the tropopause will improve.