[A-CG44] Kuroshio Large Meander

[ACG44-P02] Reproduction of Kuroshio path variations in the past 60 years with a long-term high-resolution ocean reanalysis dataset (FORA-JPN60)

*Norihisa Usui¹, Nariaki Hirose¹, Kei Sakamoto², Hiroaki Asai², Shiro Nishikawa³, Hiromichi Igarashi³, Hideyuki Nakano¹, Yoichi Ishikawa³ (1.Meteorological Research Institute, 2.Japan Meteorological Agency, 3.Japan Agency for Marine-Earth Science and Technology)

In the Area Theme 3 of the MEXT-Program for the advanced studies of climate change projection (SENTAN), we have been producing a high-resolution ocean reanalysis dataset for the seas around Japan over 60 years (FORA-JPN60). It is a successor to FORA-WNP30 (Usui et al. 2017), which was produced under the collaboration between JAMSTEC and MRI, and is produced with the latest operation coastal forecasting system in JMA (Hirose et al. 2019). The ocean model is based on MRI.COM v5.0 and the forecasting system consists of three component models for the seas around Japan (JPN; 2km), North Pacific (NP; 10km), and global (GLB; 100km). Data assimilation based on MOVE-4DVAR (Usui et al. 2015) and MOVE-3DVAR is applied to North Pacific and global analysis models, and the JPN, NP, and GLB models are corrected using analysis model results with an initialization scheme by Incremental Analysis Update (Bloom et al. 1996). In this presentation, we will show initial results on the reproducibility of the Kuroshio path over the past 60 years and the characteristics of the past Kuroshio large meanders.