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

Water ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 2646
Author(s):  
Kazuhisa A. Chikita ◽  
Tomoyuki Wada ◽  
Isao Kudo ◽  
Sei-Ichi Saitoh ◽  
Toru Hirawake ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Surface Sediment ◽  
Bering Sea ◽  
River Sediment ◽  
Sediment Load ◽  
Satellite Image ◽  
Sediment Runoff ◽  
Yukon River ◽  
Glacier Melt ◽  
The Bering Sea

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”.

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

2021 ◽  
Author(s):  
Kazuhisa Augistine Chikita ◽  
Tomoyuki Wada ◽  
Isao Kudo ◽  
Sei-Ichi Saitoh ◽  
Toru Hirawake ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Surface Sediment ◽  
Bering Sea ◽  
River Sediment ◽  
Sediment Load ◽  
Satellite Image ◽  
Sediment Runoff ◽  
Yukon River ◽  
Glacier Melt ◽  
The Bering Sea

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 measure-ments of the Yukon River discharge and sediment load, behaviors of the sediment plumes were explored by shipboard observations in the Bering Sea offshore from the Yukon delta. At the high river sediment load of ca. 3000 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 &lt; 0.063 mm). In order to numerically obtain the area of the surface sediment plumes, a satellite image analy-sis was performed by using three near-infrared bands in MODIS/Aqua or MODIS/Terra. The plume area was significantly correlated (R2=0.735, p&lt;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”.

scholarly journals Effects of River Discharge and Sediment Load on Sediment Plume Behaviors in a Coastal Region: The Yukon River, Alaska and the Bering Sea

Hydrology ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 45
Author(s):  
Kazuhisa A. Chikita ◽  
Tomoyuki Wada ◽  
Isao Kudo ◽  
Sei-Ichi Saitoh ◽  
Mitsuhiro Toratani
Keyword(s):  
Suspended Sediment ◽  
Bering Sea ◽  
River Sediment ◽  
Sediment Load ◽  
Coastal Region ◽  
Bottom Layer ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Yukon River ◽  
The Bering Sea

In the Bering Sea around and off the Yukon River delta, surface sediment plumes are markedly formed by glacier-melt and rainfall sediment runoffs of the Yukon River, Alaska, in June– September. The discharge and sediment load time series of the Yukon River were obtained at the lowest gauging station of US Geological Survey in June 2006–September 2010. Meanwhile, by coastal observations on boat, it was found out that the river plume plunges at a boundary between turbid plume water and clean marine water at the Yukon River sediment load of more than ca. 2500 kg/s. Grain size analysis with changing salinity (‰) for the river sediment indicated that the suspended sediment becomes coarse at 2 to 5‰ by flocculation. Hence, the plume’s plunging probably occurred by the flocculation of the Yukon suspended sediment in the brackish zone upstream of the plunging boundary, where the differential settling from the flocculation is considered to have induced the turbid water intrusion into the bottom layer.

The plume of the Yukon River in relation to the oceanography of the Bering Sea

1989 ◽  
Vol 28 ◽  
pp. 75-84 ◽  
Author(s):  
Kenneson G. Dean ◽  
C.Peter McRoy ◽  
Kristina Ahlnäs ◽  
Alan Springer
Keyword(s):  
Bering Sea ◽  
Yukon River ◽  
The Bering Sea

Diatom distribution of surface sediment in the Bering Sea and Chukchi Sea

2014 ◽  
Vol 24 (2) ◽  
pp. 106-112 ◽  
Author(s):  
Lihua RAN ◽  
Jianfang CHEN ◽  
Haiyan JIN ◽  
Hongliang LI ◽  
Yong LU ◽  
...  
Keyword(s):  
Surface Sediment ◽  
Bering Sea ◽  
Chukchi Sea ◽  
The Bering Sea

Siphonaptera from mammals in Alaska. Supplement III. Western Alaska

1982 ◽  
Vol 60 (4) ◽  
pp. 729-732 ◽  
Author(s):  
Glenn E. Haas ◽  
Nixon Wilson ◽  
Randall L. Zarnke ◽  
Richard E. Barrett ◽  
Tim Rumfelt
Keyword(s):  
Bering Sea ◽  
Black Bear ◽  
Domestic Dog ◽  
The Arctic ◽  
Meadow Vole ◽  
Wild Mammals ◽  
Yukon River ◽  
New Localities ◽  
Sea Coast ◽  
The Bering Sea

Nineteen taxa of mammal fleas were recorded from 93 collections from western Alaska. Oropsylla alaskensis (Baker) and O. arctomys (Baker) are additions to this series of reports. The other 17 taxa were recorded from 71 new localities; 46 records were from remote localities. Many range extensions resulted and noteworthy were Ctenocephalides f. felis (Bouché) north to Fairbanks, Corrodopsylla c. curvata (Rothschild) west to the Bering Sea coast, Megabothris abantis (Rothschild) northwest to the lower Yukon River Valley, and Chaetopsylla tuberculaticeps (Bezzi) north of the Arctic Circle. Six hosts were not in our previous records: masked shrew, woodchuck, meadow vole, collared lemming, black bear, and wolverine. In all, 14 species of wild mammals, domestic dog and cat, and man were recorded hosts. Records from bat roosts were included.

Devosia beringensis sp. nov., isolated from surface sediment of the Bering Sea

2021 ◽  
Vol 71 (8) ◽  
Author(s):  
Yu-Xin Zhang ◽  
Yong Yu ◽  
Wei Luo ◽  
Yin-Xin Zeng ◽  
Zong-Jun Du ◽  
...  
Keyword(s):  
Surface Sediment ◽  
Bering Sea ◽  
Type Species ◽  
Phylogenetic Analyses ◽  
Rrna Gene ◽  
Respiratory Quinone ◽  
Content Type ◽  
Link Type ◽  
Major Respiratory Quinone ◽  
The Bering Sea

Strain S02T was isolated from a surface sediment sample collected from the Bering Sea (64.3361° N, 170.9541° W). The cells were Gram-stain-negative, motile and rod-shaped. The temperature range for growth was 4–25 °C and the pH for growth was 5.5–9.0, with optimum growth occurring at 20–25 °C and pH 7.0–8.0. Growth occurred in the presence of 0–7 % (w/v) NaCl (optimum, 2–5 %). Strain S02T had menaquinone-8 as the major respiratory quinone and summed feature 8 (C18 : 1  ω7c and/or C18 : 1  ω6c), C16:0, C17 : 0 cyclo, summed feature 3 (C16 : 1  ω7c /C16 : 1  ω7c), C17 : 0 and C18 : 0 as major fatty acids. The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol and two glycolipids. The genomic DNA G+C content was approximately 63.8 mol%. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain S02T belonged to the genus Devosia . Strain S02T showed the highest sequence similarities to Devosia psychrophila Cr7-05T (97.5 %), Devosia naphthalenivorans CM5-1T (97.7 %), Devosia submarina KMM 9415T (97.4 %), Devosia epidermidihirudinis E84T (97.44 %), Devosia euplotis LIV5T (97.1 %) and Devosia limi DSM 17137T (96.7 %). On the basis of phylogenetic analyses and phenotypic characteristics, a novel species of the genus Devosia , Devosia beringensis sp. nov., is proposed, with the type strain S02T (=JCM 33772=CCTCC AB 2019343).

THE DISTRIBUTION OF SURFACE SEDIMENT DIATOMS IN THE BERING SEA AND CHUKCHI SEA

2013 ◽  
Vol 24 (1) ◽  
pp. 15-23
Author(s):  
Lihua Ran ◽  
Jianfang Chen ◽  
Haiyan Jin ◽  
Hongliang Li ◽  
Yong Lu ◽  
...  
Keyword(s):  
Surface Sediment ◽  
Bering Sea ◽  
Chukchi Sea ◽  
The Bering Sea
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