[A-AS05] 大規模な水蒸気場と組織化した雲システム

[AAS05-P08] Deep Numerical Analysis (DNA)気候学への挑戦: 短時間と長時間の気候シミュレーションを接合する枠組みの構築

*三浦 裕亮¹、小玉 知央²、高野 雄紀³、高須賀 大輔³、末松 環⁴ (1.東京大学大学院理学系研究科、2.海洋研究開発機構、3.東京大学大気海洋研究所、4.理化学研究所計算科学研究センター)

キーワード：気候、全球雲解像モデル、全球気候モデル

We have launched the “DNA (Deep Numerical Analysis) Climate Science” project to develop an earth systems model with a kilometer-scale horizontal mesh size, as part of the basic technology for a “digital earth.” Through this project, we will realize a new climate simulation using a numerical model, in which the hierarchical structures of the clouds inherent in typhoons and Madden-Julian oscillations are spontaneously reproduced according to cloud microphysics equations. This is analogous to the spontaneous formation of cells and organs in living organisms according to DNA, the blueprint of life. For this purpose, the “global cloud-resolving model” (GCRM) and “global climate model” (GCM), which have been developed independently for over 20 years, will be integrated to utilize their respective strengths. The GCRM can physically express cloud microphysics and the interactions between radiation and circulation, and has been particularly adept at reproducing short-term phenomena. The GCM has reduced climate bias by utilizing convection and cloud parameterization and has become an essential tool for research on understanding and predicting climate change. Furthermore, it has contributed to the IPCC assessment reports for many years. In this project, we will construct a new generation of climate models that will bring qualitative reform to climate research, through asymptotic matching of solutions between GCRM and GCM on the time scales of seasons to several years, which both have large uncertainties.