Composition and characteristics of particles in the ocean : evidence for present day resuspension
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution May 1980 This study of particulate matter in the water column and the underlying surface sediments verifies the occurr...
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Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
1980
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/2074 2023-05-15T16:46:57+02:00 Composition and characteristics of particles in the ocean : evidence for present day resuspension Richardson, Mary Josephine South Iceland Rise 1980-05 application/pdf https://hdl.handle.net/1912/2074 en_US eng Massachusetts Institute of Technology and Woods Hole Oceanographic Institution WHOI Theses https://hdl.handle.net/1912/2074 doi:10.1575/1912/2074 doi:10.1575/1912/2074 Suspended sediments Sedimentation and deposition Marine sediments Atlantis II (Ship : 1963-) Cruise AII96 Thesis 1980 ftwhoas https://doi.org/10.1575/1912/2074 2022-05-28T22:57:28Z Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution May 1980 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. Particulate matter was sampled with Niskin bottles, to obtain the standing crop of suspended matter and with sediment traps, to obtain the material in flux through the water column. Box cores were taken to obtain surface sediment samples for comparison with the trap samples. 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. Particle size distributions have lower variance in the nepheloid layer than those in clear water which have roughly equal volumes of material in logarithmically increasing size grades from 1-20 μm. Apparent density differences between SPM in clear water and the nepheloid layer are not distinguishable in the Iceland Rise study; apparent densities increase in the nepheloid layer in the western North Atlantic. An apparent density of 1.1 g/cm3 adequately separates clear water from nepheloid layer samples in this region. Compositional variations seen between clear water and the nepheloid layer include a decrease in small coccoliths and an increase in clays and mineral matter. These compositional variations ... Thesis Iceland North Atlantic Norwegian Sea Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Norwegian Sea Woods Hole, MA |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Suspended sediments Sedimentation and deposition Marine sediments Atlantis II (Ship : 1963-) Cruise AII96 |
spellingShingle |
Suspended sediments Sedimentation and deposition Marine sediments Atlantis II (Ship : 1963-) Cruise AII96 Richardson, Mary Josephine Composition and characteristics of particles in the ocean : evidence for present day resuspension |
topic_facet |
Suspended sediments Sedimentation and deposition Marine sediments Atlantis II (Ship : 1963-) Cruise AII96 |
description |
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution May 1980 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. Particulate matter was sampled with Niskin bottles, to obtain the standing crop of suspended matter and with sediment traps, to obtain the material in flux through the water column. Box cores were taken to obtain surface sediment samples for comparison with the trap samples. 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. Particle size distributions have lower variance in the nepheloid layer than those in clear water which have roughly equal volumes of material in logarithmically increasing size grades from 1-20 μm. Apparent density differences between SPM in clear water and the nepheloid layer are not distinguishable in the Iceland Rise study; apparent densities increase in the nepheloid layer in the western North Atlantic. An apparent density of 1.1 g/cm3 adequately separates clear water from nepheloid layer samples in this region. Compositional variations seen between clear water and the nepheloid layer include a decrease in small coccoliths and an increase in clays and mineral matter. These compositional variations ... |
format |
Thesis |
author |
Richardson, Mary Josephine |
author_facet |
Richardson, Mary Josephine |
author_sort |
Richardson, Mary Josephine |
title |
Composition and characteristics of particles in the ocean : evidence for present day resuspension |
title_short |
Composition and characteristics of particles in the ocean : evidence for present day resuspension |
title_full |
Composition and characteristics of particles in the ocean : evidence for present day resuspension |
title_fullStr |
Composition and characteristics of particles in the ocean : evidence for present day resuspension |
title_full_unstemmed |
Composition and characteristics of particles in the ocean : evidence for present day resuspension |
title_sort |
composition and characteristics of particles in the ocean : evidence for present day resuspension |
publisher |
Massachusetts Institute of Technology and Woods Hole Oceanographic Institution |
publishDate |
1980 |
url |
https://hdl.handle.net/1912/2074 |
op_coverage |
South Iceland Rise |
geographic |
Norwegian Sea |
geographic_facet |
Norwegian Sea |
genre |
Iceland North Atlantic Norwegian Sea |
genre_facet |
Iceland North Atlantic Norwegian Sea |
op_source |
doi:10.1575/1912/2074 |
op_relation |
WHOI Theses https://hdl.handle.net/1912/2074 doi:10.1575/1912/2074 |
op_doi |
https://doi.org/10.1575/1912/2074 |
op_publisher_place |
Woods Hole, MA |
_version_ |
1766037046727540736 |