日本地球惑星科学連合2019年大会

講演情報

[J] ポスター発表

セッション記号 M (領域外・複数領域) » M-IS ジョイント

[M-IS24] 海底~海面を貫通する海域観測データの統合解析

2019年5月26日(日) 15:30 〜 17:00 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:有吉 慶介(国立研究開発法人海洋研究開発機構)、木戸 元之(東北大学 災害科学国際研究所)、稲津 大祐(東京海洋大学)、高橋 成実(防災科学技術研究所)

[MIS24-P06] 北海道南東岸沖における親潮の後退に関係した海底圧力変動

*長谷川 拓也1永野 憲2松本 浩幸2有吉 慶介2脇田 昌英2 (1.東北大学、2.海洋研究開発機構)

キーワード:海底圧力、親潮、海面高度、エルニーニョ

To investigate the impact of Oyashio current variation on bottom pressure (BP) at observation stations PG1 (41.7040N, 144.4375E) and PG2 (42.2365N, 144.8454E), which are located in the onshore region of the Kuril Trench off Kushiro-Tokachi, altimetric sea surface height (SSH) and ocean bottom pressure (OBP) gauge data were evaluated. Two and a half years after El Nino, during 2007–2008 and 2012– 2013, the Oyashio retreated toward the northeast due to warm-core rings, which were inferred from SSH elevations at both stations. Due to the barotropic nature of the Oyashio, BP at PG1 near the offshore edge of the continental shelf is enhanced corresponding to the SSH elevations. Meanwhile, at PG2, BP remained relatively unchanged in spite of the high SSH variability because the main pycnocline adjusted rapidly to the SSH elevations. BP changes at PG1 caused by the northeastward retreat of the Oyashio cannot be neglected to detect BP change by crustal deformations.

Acknowledgements: The authors would like to thank Prof. D. Inazu (Tokyo University of Marine Science and Technology) and Dr. Y. Itoh (Kyoto Univerisity) for their insightful comments. This work was partly supported by the Japan Society for the Promotion of Science (JSPS), Grant-in-Aid for Scientific Research (15H04228, 15H02835, 17K05660).