Composition and Characteristics of Particles in the Ocean: Evidence for Present Day Resuspension.

This study of particulate matter in the water column and the underlying surface sediments verifies the occurrence of local, present-day resuspension in the deep sea. The location of the major portion of this work was the South Iceland Rise, a region influenced by the flow of Norwegian Sea Overflow W...

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Bibliographic Details
Main Author: Richardson,Mary Josephine
Other Authors: WOODS HOLE OCEANOGRAPHIC INSTITUTION MASS
Format: Text
Language:English
Published: 1980
Subjects:
Biological Oceanography
Physical and Dynamic Oceanography
*PARTICULATES
LIGHT SCATTERING
SIZES(DIMENSIONS)
THESES
IDENTIFICATION
SAMPLING
NORTH ATLANTIC OCEAN
SEDIMENTS
OCEAN BOTTOM
MINERALS
DISPERSIONS
PLANKTON
Resuspension
WUNR083004
Norwegian Sea
Iceland
Neogloboquadrina pachyderma
North Atlantic
Planktonic foraminifera
Online Access:http://www.dtic.mil/docs/citations/ADA092231
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA092231
Description
Summary:This study of particulate matter in the water column and the underlying surface sediments verifies the occurrence of local, present-day resuspension in the deep sea. The location of the major portion of this work was the South Iceland Rise, a region influenced by the flow of Norwegian Sea Overflow Water. Measured current velocities exceeded 20 cm/sec in the axis of the bottom current for the duration of the deployments, approximately two weeks. Suspended particulate matter (SPM) and light-scattering studies demonstrate that in the Iceland Rise area the correlation of the L-DGO nephelometer to concentration of SPM differs between clear water and the nepheloid layer. Correlations of light scattering to SPM concentration also differ regionally, but for predicting concentration from light scattering, regression lines at two locations are indistinguishable. A comparison of sediment-trap samples with box-core surface samples further supports present-day resuspension. Benthic foraminifera, iron-oxide coated planktonic foraminifera and the glacial, subpolar planktonic foraminifera (Neogloboquadrina pachyderma (sinistral)) in traps at 10, 100 and a few specimens at 500 mab, provide conclusive evidence for local resuspension. Sponsored in part by contract N00014-75-C-0291.

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