Behaviors of the Yukon River Sediment Plume in the Bering Sea: Relations to Glacier-Melt Discharge and Sediment Load

Chikita, Kazuhisa A.; Wada, Tomoyuki; Kudo, Isao; Saitoh, Sei-Ichi; Hirawake, Toru; Toratani, Mitsuhiro

Behaviors of the Yukon River Sediment Plume in the Bering Sea: Relations to Glacier-Melt Discharge and Sediment Load

Chikita, Kazuhisa A.; Wada, Tomoyuki; Kudo, Isao et al.

Water, 2021, 13(19), 2646

Permalink : https://hdl.handle.net/2115/83383

このアイテムのアクセス数:531件（2026-08-16 19:37 集計）

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https://doi.org/10.3390/w13192646			24

論文情報

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アクセス権	open access
URI	https://hdl.handle.net/2115/83383
タイトル	Behaviors of the Yukon River Sediment Plume in the Bering Sea: Relations to Glacier-Melt Discharge and Sediment Load
著者	Chikita, Kazuhisa A. ; Wada, Tomoyuki ; Kudo, Isao ; Saitoh, Sei-Ichi ; Hirawake, Toru ; Toratani, Mitsuhiro
e-Rad_Researcher 70142685 著者名 Chikita, Kazuhisa A.
著者名 Wada, Tomoyuki
e-Rad_Researcher 00195455 著者名 Kudo, Isao
e-Rad_Researcher 70250503 著者名 Saitoh, Sei-Ichi
e-Rad_Researcher 70311165 著者名 Hirawake, Toru
e-Rad_Researcher 90246075 著者名 Toratani, Mitsuhiro
言語	英語
キーワード	Yukon River
	sediment load
	surface sediment plume
	density underflow
	MODIS image
発行日	2021-10
出版者	MDPI
収録物名	Water
巻(号)	13(19)
ページ	2646
抄録	Sediment plumes, released to the Bering Sea from the delta front of the Yukon River, Alaska, are initiated mainly by glacier-melt sediment runoffs in the glacierized regions of the Yukon River drainage basin. The surface sediment plumes are extended around the fan-shaped Yukon River delta, which is followed by the northwestward dispersion. During continuous measurements of the Yukon River discharge and sediment load, behaviors of the sediment plumes were explored by shipboard and coastal observations in the Bering Sea. At the high river sediment load of ca. 2500 kg/s, the plume partially plunged into the sea bottom layer. The plunging probably originated in the nepheloid-layer formation from the flocculation of river-suspended sediment, of which more than 90% wt. is silt and clay (grain size d < 63 μm). In order to numerically obtain the area of the surface sediment plumes, a satellite image analysis was performed by using three near-infrared bands in MODIS/Aqua or MODIS/Terra. The plume area was significantly correlated (R2 = 0.735, p < 0.01) to the sediment load averaged for the two days with time lags of 20 days and 21 days to the date of a certain satellite image. Hence, the dispersion of plume-suspended sediment appears to be controlled by the sediment runoff events in the Yukon River rather than the northward “Alaskan Coastal Water”.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
PISSN	2073-4441
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.3390/w13192646