Ocean mixing processes (OMIX): impact on biogeochemistry, climate and ecosystem
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SPECIAL SECTION: PREFACE Ocean Mixing Processes (OMIX): Impact on Biogeochemistry, Climate an Ecosystem
Ocean mixing processes (OMIX): impact on biogeochemistry, climate and ecosystem Ichiro Yasuda1 · Shuhei Masuda2 · Jun Nishioka3 · Xinyu Guo4 · Naomi Harada2 · Shin‑ichi Ito1 · Toshiyuki Hibiya5 · Hiroyasu Hasumi1
© The Oceanographic Society of Japan and Springer Nature Singapore Pte Ltd. 2020
This special section of Journal of Oceanography is a collection of papers from a project “Ocean mixing processes (OMIX): impact on biogeochemistry, climate and ecosystem (2015–2019)” funded as MEXT Kakenhi of the Grant-in-Aid for Scientific Research on Innovative Areas. OMIX had been organized by 8 primary teams with about 70 scientists with 2-year 30 selected members. The central issue of OMIX is the ocean diapycnal (vertical) mixing, which is a fundamental process that regulates ocean overturning (meridionaldiapycnal) circulations of water, nutrients, carbon and heat. However, its distribution and generation mechanisms have not been well known because of the difficulties of observations. OMIX attempted to expand integrated mixing and biogeochemical studies by developing efficient mixing measurements and elucidating turbulent nutrient fluxes to maintain ecosystem in the Oyashio and the Kuroshio and their originating regions. This leads to findings: tide-induced enhanced turbulent mixing around islands and near rough topography and the Kuroshio-topography interactions play essential roles in uplifting iron and nitrate in the Oyashio and Kuroshio regions, respectively, those of which support the active biological production around Japanese waters. The mixing observations were synthesized by a data assimilation * Ichiro Yasuda [email protected]‑tokyo.ac.jp 1
Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, Japan
2
Japan Agency for Marine-Earth Science and Technology, 2‑15, Natsushima, Yokosuka, Kanagawa 237‑0061, Japan
3
Institute of Low Temperature Science, Hokkaido University, Sapporo, Hokkaido, Japan
4
Center for Marine Environmental Studies, Ehime University, Matsuyama, Ehime, Japan
5
Graduate School of Science, The University of Tokyo, Hongo, Tokyo, Japan
approach to show an aspect of global mixing distribution and to improve quantification of deep water warming and biogeochemical cycles. Knowledge from the observations are also included in the next-generation numerical models with mixing variability to elucidate three-dimensional deep circulation in the North Pacific, which also could affect global climate through sea-ice distribution. Bi-decadal Ocean and climate variability caused by 18.6-year period tidal mixing modulation were also studied with observations and high-resolution climate models with mixing variability. To improve the knowledge of fish reproduction processes, fish-otholith oxygen isotope analysis methods were developed to help finding the favorable environmental conditions and migration routes for the recruitment of chub-mackerel, the conditions which co
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