Atlantic-origin water extension into the Pacific Arctic induced an anomalous biogeochemical event

Shigeto Nishino (), Jinyoung Jung, Kyoung-Ho Cho, William J. Williams, Amane Fujiwara, Akihiko Murata, Motoyo Itoh, Eiji Watanabe, Michio Aoyama, Michiyo Yamamoto-Kawai, Takashi Kikuchi, Eun Jin Yang and Sung-Ho Kang
Additional contact information
Shigeto Nishino: Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
Jinyoung Jung: Korea Polar Research Institute
Kyoung-Ho Cho: Korea Polar Research Institute
William J. Williams: Fisheries and Oceans Canada
Amane Fujiwara: Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
Akihiko Murata: Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
Motoyo Itoh: Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
Eiji Watanabe: Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
Michio Aoyama: Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
Michiyo Yamamoto-Kawai: Tokyo University of Marine Science and Technology
Takashi Kikuchi: Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
Eun Jin Yang: Korea Polar Research Institute
Sung-Ho Kang: Korea Polar Research Institute

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract The Arctic Ocean is facing dramatic environmental and ecosystem changes. In this context, an international multiship survey project was undertaken in 2020 to obtain current baseline data. During the survey, unusually low dissolved oxygen and acidified water were found in a high-seas fishable area of the western (Pacific-side) Arctic Ocean. Herein, we show that the Beaufort Gyre shrinks to the east of an ocean ridge and forms a front between the water within the gyre and the water from the eastern (Atlantic-side) Arctic. That phenomenon triggers a frontal northward flow along the ocean ridge. This flow likely transports the low oxygen and acidified water toward the high-seas fishable area; similar biogeochemical properties had previously been observed only on the shelf-slope north of the East Siberian Sea.

Date: 2023
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DOI: 10.1038/s41467-023-41960-w

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