Determination of the freshwater origin of Coastal Oyashio Water using humic-like fluorescence in dissolved organic matter

Mizuno, Yu; Nishioka, Jun; Tanaka, Takahiro; Tada, Yuya; Suzuki, Koji; Tsuzuki, Yuta; Sugimoto, Atsuko; Yamashita, Youhei

Determination of the freshwater origin of Coastal Oyashio Water using humic-like fluorescence in dissolved organic matter

Mizuno, Yu; Nishioka, Jun; Tanaka, Takahiro et al.

Journal of oceanography, 2018, 74(5), 509-521

Permalink : https://hdl.handle.net/2115/71648

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アクセス権	open access
URI	https://hdl.handle.net/2115/71648
タイトル	Determination of the freshwater origin of Coastal Oyashio Water using humic-like fluorescence in dissolved organic matter
著者	Mizuno, Yu ; Nishioka, Jun ; Tanaka, Takahiro ; Tada, Yuya ; Suzuki, Koji ; Tsuzuki, Yuta ; Sugimoto, Atsuko ; Yamashita, Youhei
著者名 Mizuno, Yu
e-Rad_Researcher 90371533 著者名 Nishioka, Jun
著者名 Tanaka, Takahiro
著者名 Tada, Yuya
e-Rad_Researcher 40283452 著者名 Suzuki, Koji
著者名 Tsuzuki, Yuta
著者名 Sugimoto, Atsuko
e-Rad_Researcher 50432224 著者名 Yamashita, Youhei
言語	英語
キーワード	Coastal Oyashio Water
	Freshwater end-member
	River water
	Sea-ice melt water
	Dissolved organic matter
	Humic fluorescence
発行日	2018-10
出版者	Springer
収録物名	Journal of oceanography
巻(号)	74(5)
ページ	509-521
抄録	Coastal Oyashio Water (COW), defined as a water mass with a temperature lower than 2 degrees C and a salinity lower than 33.0, is distributed in the North Pacific Ocean off southeastern Hokkaido, Japan, from winter to spring. COW is rich in macronutrients and dissolved iron and is thus considered to affect the spring phytoplankton blooms in the Oyashio region. Although river water and sea-ice melt water have been considered freshwater end-members of COW, the contributions of these freshwater sources to COW have not been well described. In this study, the humic-like components in dissolved organic matter were first applied as a parameter to evaluate the freshwater end-members of COW in March 2015. Linear regressions with negative slopes were determined between the humic-like components and the salinity of COW. The intercepts of the regressions against the humic-like components were within the ranges of those observed for the local rivers of Hokkaido but were very different from those of sea ice. These findings suggest that river water contributed to the COW observed here as a freshwater end-member, although the contribution of sea-ice melt water to COW could not be evaluated. This novel approach also highlighted two different less-saline water masses in COW. The first was characterized by a lower temperature and relatively high levels of humic-like components, while the second was higher in temperature and had higher levels of humic-like components. It is suggested that these different characteristics are due to the contributions of water from different rivers and/or different effects of sea-ice melt water.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution 4.0 International
権利情報	The final publication is available at Springer via http://dx.doi.org/10.1007/s10872-018-0477-x
PISSN	0916-8370
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1007/s10872-018-0477-x