Near-bottom particle flux in the abyssal northeast Atlantic
During a 17-month study at a site on the Porcupine Abyssal Plain of the northeast Atlantic (approx. 48°N 20°W), the downward flux of particulate material within and above the benthic nepheloid layer (BNL) was measured using sediment traps 1455 m above bottom (mab) (3100 m depth) and 90 mab (4465 m d...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2000
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/108862/ https://doi.org/10.1016/S0967-0645(00)00016-3 |
id |
ftnerc:oai:nora.nerc.ac.uk:108862 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:108862 2023-05-15T17:41:15+02:00 Near-bottom particle flux in the abyssal northeast Atlantic Lampitt, R.S. Newton, P.P. Jickells, T.D. Thomson, J. King, P. 2000 http://nora.nerc.ac.uk/id/eprint/108862/ https://doi.org/10.1016/S0967-0645(00)00016-3 unknown Lampitt, R.S.; Newton, P.P.; Jickells, T.D.; Thomson, J.; King, P. 2000 Near-bottom particle flux in the abyssal northeast Atlantic. Deep-Sea Research II, 47 (9-11). 2051-2071. https://doi.org/10.1016/S0967-0645(00)00016-3 <https://doi.org/10.1016/S0967-0645(00)00016-3> Publication - Article PeerReviewed 2000 ftnerc https://doi.org/10.1016/S0967-0645(00)00016-3 2023-02-04T19:33:49Z During a 17-month study at a site on the Porcupine Abyssal Plain of the northeast Atlantic (approx. 48°N 20°W), the downward flux of particulate material within and above the benthic nepheloid layer (BNL) was measured using sediment traps 1455 m above bottom (mab) (3100 m depth) and 90 mab (4465 m depth). Flux at 90 mab is usually higher than the primary flux at 3100 m depth, and this enhancement is especially pronounced during the winter. The additional material found in the near-bottom trap comprises recently deposited resuspended material (rebound flux), but with an admixture of refractory sediment. It is unlikely that scavenging of either BNL particles or dissolved material contributes greatly to the near-bottom flux. Fluxes of metal tracers (232Th and Al) and cyanobacteria into traps were used to examine the process of resuspension. The ratio of tracer flux at 90 mab to that at 3100 m depth was taken as a measure of the strength of the resuspension process (the resuspension factor RF) and reflects clearly the enhanced resuspension in winter. This seasonal variation appears to be related to both the magnitude of near-bottom currents and to the wave height at the surface 40 days before. It is also possible that recently deposited material forms a partly cohesive blanket on the sediment surface that restricts resuspension to the benthic boundary layer. Article in Journal/Newspaper Northeast Atlantic Natural Environment Research Council: NERC Open Research Archive Deep Sea Research Part II: Topical Studies in Oceanography 47 9-11 2051 2071 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
During a 17-month study at a site on the Porcupine Abyssal Plain of the northeast Atlantic (approx. 48°N 20°W), the downward flux of particulate material within and above the benthic nepheloid layer (BNL) was measured using sediment traps 1455 m above bottom (mab) (3100 m depth) and 90 mab (4465 m depth). Flux at 90 mab is usually higher than the primary flux at 3100 m depth, and this enhancement is especially pronounced during the winter. The additional material found in the near-bottom trap comprises recently deposited resuspended material (rebound flux), but with an admixture of refractory sediment. It is unlikely that scavenging of either BNL particles or dissolved material contributes greatly to the near-bottom flux. Fluxes of metal tracers (232Th and Al) and cyanobacteria into traps were used to examine the process of resuspension. The ratio of tracer flux at 90 mab to that at 3100 m depth was taken as a measure of the strength of the resuspension process (the resuspension factor RF) and reflects clearly the enhanced resuspension in winter. This seasonal variation appears to be related to both the magnitude of near-bottom currents and to the wave height at the surface 40 days before. It is also possible that recently deposited material forms a partly cohesive blanket on the sediment surface that restricts resuspension to the benthic boundary layer. |
format |
Article in Journal/Newspaper |
author |
Lampitt, R.S. Newton, P.P. Jickells, T.D. Thomson, J. King, P. |
spellingShingle |
Lampitt, R.S. Newton, P.P. Jickells, T.D. Thomson, J. King, P. Near-bottom particle flux in the abyssal northeast Atlantic |
author_facet |
Lampitt, R.S. Newton, P.P. Jickells, T.D. Thomson, J. King, P. |
author_sort |
Lampitt, R.S. |
title |
Near-bottom particle flux in the abyssal northeast Atlantic |
title_short |
Near-bottom particle flux in the abyssal northeast Atlantic |
title_full |
Near-bottom particle flux in the abyssal northeast Atlantic |
title_fullStr |
Near-bottom particle flux in the abyssal northeast Atlantic |
title_full_unstemmed |
Near-bottom particle flux in the abyssal northeast Atlantic |
title_sort |
near-bottom particle flux in the abyssal northeast atlantic |
publishDate |
2000 |
url |
http://nora.nerc.ac.uk/id/eprint/108862/ https://doi.org/10.1016/S0967-0645(00)00016-3 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
Lampitt, R.S.; Newton, P.P.; Jickells, T.D.; Thomson, J.; King, P. 2000 Near-bottom particle flux in the abyssal northeast Atlantic. Deep-Sea Research II, 47 (9-11). 2051-2071. https://doi.org/10.1016/S0967-0645(00)00016-3 <https://doi.org/10.1016/S0967-0645(00)00016-3> |
op_doi |
https://doi.org/10.1016/S0967-0645(00)00016-3 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
47 |
container_issue |
9-11 |
container_start_page |
2051 |
op_container_end_page |
2071 |
_version_ |
1766142707734937600 |