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

Hoshiba, Yasuhiro; Yamanaka, Yasuhiro

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

Hoshiba, Yasuhiro; Yamanaka, Yasuhiro

Journal of oceanography, 2013, 69(6), 753-767

Permalink : https://hdl.handle.net/2115/57453

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アクセス権	open access
URI	https://hdl.handle.net/2115/57453
タイトル	Along-coast shifts of plankton blooms driven by riverine inputs of nutrients and fresh water onto the coastal shelf: a model simulation
著者	著者名 Hoshiba, Yasuhiro
著者	e-Rad_Researcher 40242177 著者名 Yamanaka, Yasuhiro
言語	英語
キーワード	Coastal ocean
	Biogeochemical cycles
	3-D modeling
	Riverine input
	Nutrient supply
	Phytoplankton bloom
	Color tracer
発行日	2013-12
出版者	Springer
収録物名	Journal of oceanography
巻(号)	69(6)
ページ	753-767
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	© The Oceanographic Society of Japan and Springer Japan 2013, The final publication is available at link.springer.com
PISSN	0916-8370
NCID	AA10833529
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1007/s10872-013-0206-4