Can neap-spring tidal cycles modulate biogeochemical fluxes in the abyssal near-seafloor water column?
Before particulate matter that settles as ‘primary flux’ from the interior ocean is deposited into deep-sea sediments it has to traverse the benthic boundary layer (BBL) that is likely to cover almost all parts of the seafloor in the deep seas. Fluid dynamics in the BBL differ vastly from fluid dyna...
Published in: | Progress in Oceanography |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2017
|
Subjects: | |
Online Access: | https://pure.uhi.ac.uk/en/publications/e0a24c51-06cc-4f94-be94-5b879ebaa254 https://doi.org/10.1016/j.pocean.2017.04.006 https://pureadmin.uhi.ac.uk/ws/files/2234288/1_s2.0_S0079661116301860_main.pdf |
id |
ftuhipublicatio:oai:pure.atira.dk:publications/e0a24c51-06cc-4f94-be94-5b879ebaa254 |
---|---|
record_format |
openpolar |
spelling |
ftuhipublicatio:oai:pure.atira.dk:publications/e0a24c51-06cc-4f94-be94-5b879ebaa254 2024-04-28T08:32:19+00:00 Can neap-spring tidal cycles modulate biogeochemical fluxes in the abyssal near-seafloor water column? Turnewitsch, Robert Dale, Andrew Lahajnar, Niko Lampitt, Richard S Sakamoto, Kei 2017-04-21 application/pdf https://pure.uhi.ac.uk/en/publications/e0a24c51-06cc-4f94-be94-5b879ebaa254 https://doi.org/10.1016/j.pocean.2017.04.006 https://pureadmin.uhi.ac.uk/ws/files/2234288/1_s2.0_S0079661116301860_main.pdf eng eng info:eu-repo/semantics/openAccess Turnewitsch , R , Dale , A , Lahajnar , N , Lampitt , R S & Sakamoto , K 2017 , ' Can neap-spring tidal cycles modulate biogeochemical fluxes in the abyssal near-seafloor water column? ' , Progress in Oceanography , vol. 154 , pp. 1-24 . https://doi.org/10.1016/j.pocean.2017.04.006 Neap-spring tide Sediment trap Biogeochemical flux Boundary layer Abyssal ocean article 2017 ftuhipublicatio https://doi.org/10.1016/j.pocean.2017.04.006 2024-04-04T17:16:02Z Before particulate matter that settles as ‘primary flux’ from the interior ocean is deposited into deep-sea sediments it has to traverse the benthic boundary layer (BBL) that is likely to cover almost all parts of the seafloor in the deep seas. Fluid dynamics in the BBL differ vastly from fluid dynamics in the overlying water column and, consequently, have the potential to lead to quantitative and compositional changes between primary and depositional fluxes. Despite this potential and the likely global relevance very little is known about mechanistic and quantitative aspects of the controlling processes. Here, results are pre- sented for a sediment-trap time-series study that was conducted on the Porcupine Abyssal Plain in the abyssal Northeast Atlantic, with traps deployed at 2, 40 and 569 m above bottom (mab). The two bottom-most traps were situated within the BBL-affected part of the water column. The time series captured 3 neap and 4 spring tides and the arrival of fresh settling material originating from a surface-ocean bloom. In the trap-collected material, total particulate matter (TPM), particulate inorganic carbon (PIC), biogenic silica (BSi), particulate organic carbon (POC), particulate nitrogen (PN), total hydrolysable amino acids (AA), hexosamines (HA) and lithogenic material (LM) were determined. The biogeochemical results are presented within the context of time series of measured currents (at 15 mab) and turbidity (at 1 mab). The main outcome is evidence for an effect of neap/spring tidal oscillations on particulate-matter dynamics in BBL-affected waters in the deep sea. Based on the frequency-decomposed current measurements and numerical modelling of BBL fluid dynamics, it is concluded that the neap/spring tidal oscillations of particulate-matter dynamics are less likely due to temporally varying total free-stream current speeds and more likely due to temporally and vertically varying turbulence intensities that result from the temporally varying interplay of different rotational flow ... Article in Journal/Newspaper Northeast Atlantic University of the Highlands and Islands: Research Database of UHI Progress in Oceanography 154 1 24 |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
Neap-spring tide Sediment trap Biogeochemical flux Boundary layer Abyssal ocean |
spellingShingle |
Neap-spring tide Sediment trap Biogeochemical flux Boundary layer Abyssal ocean Turnewitsch, Robert Dale, Andrew Lahajnar, Niko Lampitt, Richard S Sakamoto, Kei Can neap-spring tidal cycles modulate biogeochemical fluxes in the abyssal near-seafloor water column? |
topic_facet |
Neap-spring tide Sediment trap Biogeochemical flux Boundary layer Abyssal ocean |
description |
Before particulate matter that settles as ‘primary flux’ from the interior ocean is deposited into deep-sea sediments it has to traverse the benthic boundary layer (BBL) that is likely to cover almost all parts of the seafloor in the deep seas. Fluid dynamics in the BBL differ vastly from fluid dynamics in the overlying water column and, consequently, have the potential to lead to quantitative and compositional changes between primary and depositional fluxes. Despite this potential and the likely global relevance very little is known about mechanistic and quantitative aspects of the controlling processes. Here, results are pre- sented for a sediment-trap time-series study that was conducted on the Porcupine Abyssal Plain in the abyssal Northeast Atlantic, with traps deployed at 2, 40 and 569 m above bottom (mab). The two bottom-most traps were situated within the BBL-affected part of the water column. The time series captured 3 neap and 4 spring tides and the arrival of fresh settling material originating from a surface-ocean bloom. In the trap-collected material, total particulate matter (TPM), particulate inorganic carbon (PIC), biogenic silica (BSi), particulate organic carbon (POC), particulate nitrogen (PN), total hydrolysable amino acids (AA), hexosamines (HA) and lithogenic material (LM) were determined. The biogeochemical results are presented within the context of time series of measured currents (at 15 mab) and turbidity (at 1 mab). The main outcome is evidence for an effect of neap/spring tidal oscillations on particulate-matter dynamics in BBL-affected waters in the deep sea. Based on the frequency-decomposed current measurements and numerical modelling of BBL fluid dynamics, it is concluded that the neap/spring tidal oscillations of particulate-matter dynamics are less likely due to temporally varying total free-stream current speeds and more likely due to temporally and vertically varying turbulence intensities that result from the temporally varying interplay of different rotational flow ... |
format |
Article in Journal/Newspaper |
author |
Turnewitsch, Robert Dale, Andrew Lahajnar, Niko Lampitt, Richard S Sakamoto, Kei |
author_facet |
Turnewitsch, Robert Dale, Andrew Lahajnar, Niko Lampitt, Richard S Sakamoto, Kei |
author_sort |
Turnewitsch, Robert |
title |
Can neap-spring tidal cycles modulate biogeochemical fluxes in the abyssal near-seafloor water column? |
title_short |
Can neap-spring tidal cycles modulate biogeochemical fluxes in the abyssal near-seafloor water column? |
title_full |
Can neap-spring tidal cycles modulate biogeochemical fluxes in the abyssal near-seafloor water column? |
title_fullStr |
Can neap-spring tidal cycles modulate biogeochemical fluxes in the abyssal near-seafloor water column? |
title_full_unstemmed |
Can neap-spring tidal cycles modulate biogeochemical fluxes in the abyssal near-seafloor water column? |
title_sort |
can neap-spring tidal cycles modulate biogeochemical fluxes in the abyssal near-seafloor water column? |
publishDate |
2017 |
url |
https://pure.uhi.ac.uk/en/publications/e0a24c51-06cc-4f94-be94-5b879ebaa254 https://doi.org/10.1016/j.pocean.2017.04.006 https://pureadmin.uhi.ac.uk/ws/files/2234288/1_s2.0_S0079661116301860_main.pdf |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Turnewitsch , R , Dale , A , Lahajnar , N , Lampitt , R S & Sakamoto , K 2017 , ' Can neap-spring tidal cycles modulate biogeochemical fluxes in the abyssal near-seafloor water column? ' , Progress in Oceanography , vol. 154 , pp. 1-24 . https://doi.org/10.1016/j.pocean.2017.04.006 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.pocean.2017.04.006 |
container_title |
Progress in Oceanography |
container_volume |
154 |
container_start_page |
1 |
op_container_end_page |
24 |
_version_ |
1797589561100992512 |