A New Global Climate Model of the Meteorological Research Institute: MRI-CGCM3 —Model Description and Basic Performance—

• DOI: 10.2151/jmsj.2012-a02
• Publication Date: 2012-06-06T22:34:27Z
• Authors: Seiji YUKIMOTO; Yukimasa ADACHI; Masahiro HOSAKA; Tomonori SAKAMI; Hiromasa YOSHIMURA; Mikitoshi HIRABARA; Taichu Y. TANAKA; Eiki SHINDO; Hiroyuki TSUJINO; Makoto DEUSHI; Ryo MIZUTA; Shoukichi YABU; Atsushi OBATA; Hideyuki NAKANO; Tsuyoshi KOSHIRO; Tomoaki OSE; Akio KITOH
• Keywords: 01 natural sciences; 0105 earth and related environmental sciences

A new global climate model, MRI-CGCM3, has been developed at the Meteorological Research Institute (MRI). This model is an overall upgrade of MRI's former MRI-CGCM2 series. MRI-CGCM3 composed atmosphere-land, aerosol, and ocean-ice models, a subset earth system MRI-ESM1. Atmospheric component MRI-AGCM3 interactively coupled with aerosol to represent direct indirect effects aerosols cloud microphysics scheme. Basic experiments for pre-industrial control, historical sensitivity are performed MRI-CGCM3. In control experiment, exhibits very stable behavior without climatic drifts, least in radiation budget, temperature near surface major indices ocean circulations. The sea (SST) drift sufficiently small, while there 1 W m-2 heating imbalance surface. model's estimated be 2.11 K Gregory's method. transient response (TCR) % yr-1 increase carbon dioxide (CO2) concentration 1.6 doubling CO2 4.1 quadrupling concentration. simulated present-day mean experiment evaluated by comparison observations, including reanalysis. reproduces climate, seasonal variation various aspects atmosphere oceans. Variability also found realistic, El Niño Southern Oscillation Arctic Antarctic oscillations. However, some important issues identified. SST indicates generally cold bias Northern Hemisphere (NH) warm (SH), ice expands excessively North Atlantic winter. double ITCZ appears tropical Pacific, particularly austral summer.