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Along-coast shifts of plankton blooms driven by riverine inputs of nutrients and fresh water onto the coastal shelf: a model simulation

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/57453

Title: Along-coast shifts of plankton blooms driven by riverine inputs of nutrients and fresh water onto the coastal shelf: a model simulation
Authors: Hoshiba, Yasuhiro Browse this author
Yamanaka, Yasuhiro Browse this author →KAKEN DB
Keywords: Coastal ocean
Biogeochemical cycles
3-D modeling
Riverine input
Nutrient supply
Phytoplankton bloom
Color tracer
Issue Date: Dec-2013
Publisher: Springer
Journal Title: Journal of oceanography
Volume: 69
Issue: 6
Start Page: 753
End Page: 767
Publisher DOI: 10.1007/s10872-013-0206-4
Abstract: Rivers transport nutrients and suspended sediment matter (SSM) as well as fresh water from land to coastal regions, where the biological productivity is high. In the coastal area, the buoyancy of fresh water leads to the formation of horizontal anticyclonic gyres and vertical circulations, which affect the variation of biological production such as plankton blooms. However, the primary production caused by the 3-D dynamics have not been quantitatively discussed, and observations can hardly capture the daily temporal variations of phytoplankton blooms. We developed an ocean general circulation model including a simple ecosystem model, to investigate the 3-D and temporal changes in phytoplankton blooms caused by riverine input such as flooding. The distribution patterns of nutrients and phytoplankton differ significantly from that of fresh water. The phytoplankton maxima shift from the downstream (right-hand side of the river mouth) to the upstream regions (left-hand side of the river mouth). The shift that occurs is categorized by the different nitrate origins: (1) river-originated nitrate is dominant in the downstream region; (2) subsurface-originated nitrate is dominant in the upstream region, and is transported by upwelling associated with vertical circulation and horizontal anticyclonic gyre; and (3) regenerated nitrate is dominant in the upstream region. The total primary production in phytoplankton blooms is maintained not only by river-originated nitrate but also by subsurface-originated nitrate that is 1.5 times larger than the river-originated. Several case studies (e.g., including SSM) were conducted in this study.
Rights: © The Oceanographic Society of Japan and Springer Japan 2013, The final publication is available at link.springer.com
Type: article (author version)
URI: http://hdl.handle.net/2115/57453
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 干場 康博

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