The Benthic Nepheloid Layer (BNL) North of the Keweenaw Peninsula in Lake Superior: Composition, Dynamics, and Role in Sediment Transport

2004 ◽  
Vol 30 ◽  
pp. 133-146 ◽  
Author(s):  
Noel R. Urban ◽  
J. Jeong ◽  
Yingtao Chai
Keyword(s):  
Sediment Transport ◽  
Lake Superior ◽  
Nepheloid Layer ◽  
Keweenaw Peninsula ◽  
Benthic Nepheloid Layer

Bacterioplankton Density and Activity in Benthic Nepheloid Layers of Lake Michigan and Lake Superior

1991 ◽  
Vol 48 (5) ◽  
pp. 923-932 ◽  
Author(s):  
Randall E. Hicks ◽  
Christopher J. Owen
Keyword(s):  
Lake Michigan ◽  
Bacterial Abundance ◽  
Heterotrophic Bacteria ◽  
Lake Superior ◽  
Field Measurements ◽  
Depth Interval ◽  
Nepheloid Layer ◽  
Dividing Cells ◽  
Doubling Times ◽  
Benthic Nepheloid Layer

Benthic nepheloid layers were observed in Lake Michigan and Lake Superior during July 1988 using the Johnson-Sea-Link II submersible. A particularly well-defined benthic nepheloid layer was present in Whitefish Bay, Lake Superior, where particle concentrations increased 10 times over the bottom 30 m. Bacterial abundance, however, increased only 1.5 times in the same depth interval and a maximum of only 16% 1 m above the sediment in both lakes when the sediment boundary layer was deliberately resuspended. Bacterial abundance was greater in Lake Michigan than in Lake Superior. Bacterioplankton abundance and the frequency of dividing cells were both related to temperature and organic carbon concentrations. The range of individual cell volumes (0.024–0.042 μm3) was similar in both lakes, regardless of depth. Less than 5% of the heterotrophic bacteria were actively dividing and only 2.0–3.4% of the bacterioplankton in the epilimnion and hypolimnion were synthetically active in both lakes. Bacterioplankton doubling times, estimated from field measurements of the frequency of dividing cells, increased from 29 h at 5 m to > 230 h at 310 m in the Caribou Basin of Lake Superior. The abundance, cell size, and activity of heterotrophic bacterioplankton in the deep hypolimnia of Lake Michigan and Lake Superior were unaffected by the presence of a benthic nepheloid layer.

Chlorinated hydrocarbon cycling in the benthic nepheloid layer of Lake Superior

1985 ◽  
Vol 19 (9) ◽  
pp. 854-861 ◽  
Author(s):  
Joel E. Qaker ◽  
Steven J. Eisenreich ◽  
Thomas C. Johnson ◽  
Barbara M. Halfman
Keyword(s):  
Lake Superior ◽  
Nepheloid Layer ◽  
Chlorinated Hydrocarbon ◽  
Benthic Nepheloid Layer

Sediment transport and distribution in the Argentine Basin. 3. Nepheloid layer and processes of sedimentation

1971 ◽  
Vol 8 ◽  
pp. 51-77 ◽  
Author(s):  
Maurice Ewing ◽  
Stephen L. Eittreim ◽  
John I. Ewing ◽  
Xavier Le Pichon
Keyword(s):  
Sediment Transport ◽  
Nepheloid Layer ◽  
Argentine Basin

Side-scan targets in Lake Superior-evidence for bedforms and sediment transport

Sedimentology ◽  
1984 ◽  
Vol 31 (3) ◽  
pp. 311-333 ◽  
Author(s):  
ROGER D. FLOOD ◽  
THOMAS C. JOHNSON
Keyword(s):  
Sediment Transport ◽  
Lake Superior
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