日本地球惑星科学連合2019年大会

講演情報

[E] ポスター発表

セッション記号 A (大気水圏科学) » A-OS 海洋科学・海洋環境

[A-OS12] Marine ecosystems and biogeochemical cycles: theory, observation and modeling

2019年5月27日(月) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:伊藤 進一(東京大学大気海洋研究所)、平田 貴文(北海道大学地球環境科学研究院)、Enrique N Curchitser(Rutgers University New Brunswick)、Eileen E Hofmann(Old Dominion University)

[AOS12-P10] Modeling productivity in lower trophic levels in Otsuchi Bay, northeast of Japan, using a nested OGCM with a biogeochemical component

*坂本 天1浦川 昇吾2伊藤 幸彦1羽角 博康1田中 潔1 (1.東京大学大気海洋研究所、2.気象庁気象研究所)

キーワード:ダウンスケーリング、ネストモデル、NPZDモデル

Otsuchi Bay is located on the northeast coast of Honshu Island, Japan, where was extensively damaged by the huge tsunamis caused by the 2011 off the Pacific coast of Tohoku Earthquake. Motivated by how the biogeochemical circumstance and fishery resource recover, some observations have been conducted in the bay, but those have not been enough because of several restrictions and human resources. Aimed at filling the observational shortage and the acquirement of some information about physical and low trophic fields, a modeling approach has been discussed. Using a triply-nested OGCM and a downscaling method, the authors succeeded to reproduce seasonal variability of the circulation in the bay, and also showed a seasonality of the water exchange mechanism between the bay and the open ocean (Sakamoto et al. 2017). In order to know the low trophic processes in the bay, a numerical simulation using a nested OGCM with a NPZD model is conducted. The OGCM is an improved version of Sakamoto et al’s (2017) model, and the NPZD one is based on Nagata and Hasumi (2014). In this poster, our modeling strategy and some results will be presented. The final goal of this study is to perform hindcasting simulations of the bay with realistic boundary conditions, that are the river runoff, the atmospheric forcings, and the open ocean states.