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-P03] Reproduction of iron-rich intermediate water in the Sea of Okhotsk by high resolution biogeochemical model.

*西川 はつみ1三寺 史夫1浩志 吉成2拓也 中野渡3中村 知裕1内本 圭亮4羽角 博康5 (1.北海道大学 低温科学研究所、2.国立環境研究所、3.北海道区水産研究所、4.地球環境産業技術研究機構、5.東京大学 大気海洋研究所)

キーワード:高解像度モデル、中層水鉄、リガンド濃度

Recent observation studies suggest that iron supply from sediment on the northwest continental shelf the Okhotsk Sea plays an important role for the subarctic primary production (e.g. Nishioka et al., 2013). Dense shelf water (DSW) takes up iron from sediment, thereby transporting iron into the Okhotsk Sea intermediate water. However, observational data is still limited.

To clarify detailed structure of iron circulation in the North Pacific, we develop the high-resolution biogeochemical model. However, our model did not reproduce high iron concentration in the intermediate water the Sea of Okhotsk. We use biogeochemical model developed by Parekh et al. (2005). They set the value of total ligand concentration to constant value in all place. Recent observations, however, suggest that ligand concentration varies with sea area and depth. Then, we conducted a new experiment with the ligand concentration changed in the vertical direction. The iron concentration intermediate water of the new experiment becaame higher than before.