[A-CG48] 地球規模環境変化の予測と検出

[ACG48-03] Evaluation of carbon cycles in a suite of CMIP6-C⁴MIP experiments by Meteorological Research Institute Earth System Model version 2.0 (MRI-ESM2.0)

*辻野 博之¹、小畑 淳¹、行本 誠史¹、保坂 征宏¹、田中 泰宙¹、遠山 勝也¹、神代 剛¹、浦川 昇吾¹、中野 英之¹ (1.気象庁気象研究所)

キーワード：第6次結合モデル相互比較プロジェクト、気候－炭素結合モデル相互比較プロジェクト、炭素循環、地球システムモデル

Meteorological Research Institute of Japan Meteorological Agency conducted a suite of climate projection experiments to understand response of the coupled climate–carbon cycle system to increasing anthropogenic CO₂ emissions and concentrations by following protocols of the Coupled Climate–Carbon Cycle Model Intercomparison Project (C⁴MIP) endorsed by the phase 6 of Couple Model Intercomparison Project (CMIP6). This poster will present overall evaluation of the experiments in terms of their carbon cycle by comparing with observations and similar experiments conducted by other climate modeling centers. This gives in effect an evaluation of the biogeochemical components of MRI-ESM2.0. Although the qualitative behaviors of the climate–carbon cycle system are reasonable, the carbon uptake by the land component tends to be larger than other models. This results in the atmospheric CO₂ concentrations in emission-driven experiments lower than those of the corresponding CO₂ concentration scenarios, requiring improvements for the terrestrial carbon-cycle component in a future version of MRI-ESM2.0. The poster will also present comprehensive evaluation of carbon cycle in the ocean component.