Optimization of nested ocean circulation model by four dimensional variational data assimilation system

Tsuyoshi WAKAMATSU; Yoichi ISHIKAWA

Presentation information

International Session (Oral)

Symbol A (Atmospheric, Ocean, and Environmental Sciences) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS02_29AM1] Data Assimilation in Earth Sciences

Tue. Apr 29, 2014 9:00 AM - 10:45 AM 314 (3F)

Convener:*Hirohiko Ishikawa(Disaster Prevention Research Institute, Kyoto University), Shigeo Yoden(Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University), Takeshi Enomoto(Disaster Prevention Research Institute, Kyoto University), Seon-Ki Park(Ewha Women's University), Chun-Chieh Wu(National Taiwan University), SHINICHI MIYAZAKI(Graduate School of Science, Kyoto University), Yoichi Ishikawa(JAPAN Agency for Marine-Earth Science and Technology), Chair:Yoichi Ishikawa(JAPAN Agency for Marine-Earth Science and Technology)

10:15 AM - 10:30 AM

[AAS02-05] Optimization of nested ocean circulation model by four dimensional variational data assimilation system

*Tsuyoshi WAKAMATSU¹, Yoichi ISHIKAWA¹ (1.Japan Agency for Marine-Earth Science and Technology)

Keywords:data assimilation, regional ocean circulation model

Optimization of a regional ocean circulation model by a data assimilation system is achieved by estimating optimal initial condition and external forcing terms which include boundary values. In a nested regional data assimilation system, extracting maximum information from optimized outer model through these control variables is crucial to obtain optimal performance of the nested regional data assimilation system and many schemes were proposed in the atmospheric and oceanic data assimilation studies. In this presentation, the optimization schemes of a nested atmosphere and ocean circulation model by four dimensional variation data assimilation system are summarized in a unified framework. Their performance will be analyzed using observability matrix of a variational data assimilation system constructed on regional ocean circulation model surrounding Japan islands.