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Western Arctic primary productivity regulated by shelf-break warm eddies

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Title: Western Arctic primary productivity regulated by shelf-break warm eddies
Authors: Watanabe, Eiji Browse this author
Kishi, Michio J. Browse this author →KAKEN DB
Ishida, Akio Browse this author →KAKEN DB
Aita, Maki Noguchi Browse this author
Keywords: Phytoplankton bloom
Eddy dynamics
Shelf-basin exchange
Pacific-origin water
Lower-trophic marine ecosystem model
Issue Date: Oct-2012
Publisher: Oceanographic Society of Japan
Journal Title: Journal of oceanography
Volume: 68
Issue: 5
Start Page: 703
End Page: 718
Publisher DOI: 10.1007/s10872-012-0128-6
Abstract: The response of phytoplankton to the Beaufort shelf-break eddies in the western Arctic Ocean is examined using the eddy-resolving coupled sea ice–ocean model including a lower-trophic marine ecosystem formulation. The regional model driven by the reanalysis 2003 atmospheric forcing from March to November captures the major spatial and temporal features of phytoplankton bloom following summertime sea ice retreat in the shallow Chukchi shelf and Barrow Canyon. The shelf-break warm eddies spawned north of the Barrow Canyon initially transport the Chukchi shelf water with high primary productivity toward the Canada Basin interior. In the eddy-developing period, the anti-cyclonic rotational flow along the outer edge of each eddy moving offshore occasionally traps the shelf water. The primary production inside the warm eddies is maintained by internal dynamics in the eddy-maturity period. In particular, the surface central area of an anti-cyclonic eddy acquires adequate light, nutrient, and warm environment for photosynthetic activity partly attributed to turbulent mixing with underlying nutrient-rich water. The simulated biogeochemical properties with the dominance of small-size phytoplankton inside the warm eddies are consistent with the observational findings in the western Arctic Ocean. It is also suggested that the light limitation before autumn sea ice freezing shuts down the primary production in the shelf-break eddies in spite of nutrient recovery. These results indicate that the time lag between the phytoplankton bloom in the shelf region following the summertime sea ice retreat and the eddy generation along the Beaufort shelf break is an important index to determine biological regimes in the Canada Basin.
Rights: The original publication is available at
Type: article (author version)
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 岸 道郎

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