Estimating Carbon Flux From Optically Recording Total Particle Volume at Depths Below the Primary Pycnocline
Optical instruments can rapidly determine numbers and characteristics of water column particles with high sensitivity. Here we show the usefulness of optically assessed total particle volume below the main pycnocline to estimate carbon export in two systems: the open subarctic North Atlantic and the...
Published in: | Frontiers in Marine Science |
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ODU Digital Commons
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Online Access: | https://digitalcommons.odu.edu/oeas_fac_pubs/377 https://doi.org/10.3389/fmars.2019.00778 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1388/viewcontent/Bochdansky_2019_Estimating_carbon_flux_from_op.pdf |
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ftolddominionuni:oai:digitalcommons.odu.edu:oeas_fac_pubs-1388 2023-06-11T04:06:01+02:00 Estimating Carbon Flux From Optically Recording Total Particle Volume at Depths Below the Primary Pycnocline Bochdansky, Alexander B. Dunbar, Robert B. Hansell, Dennis A. Herndl, Gerhard J. 2019-12-20T08:00:00Z application/pdf https://digitalcommons.odu.edu/oeas_fac_pubs/377 https://doi.org/10.3389/fmars.2019.00778 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1388/viewcontent/Bochdansky_2019_Estimating_carbon_flux_from_op.pdf unknown ODU Digital Commons https://digitalcommons.odu.edu/oeas_fac_pubs/377 doi:10.3389/fmars.2019.00778 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1388/viewcontent/Bochdansky_2019_Estimating_carbon_flux_from_op.pdf © 2019 Bochdansky, Dunbar, Hansell and Herndl. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CCBY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. OES Faculty Publications Biological pump Particle flux Antarctica Atlantic Carbon export Biogeochemistry Environmental Sciences Oceanography article 2019 ftolddominionuni https://doi.org/10.3389/fmars.2019.00778 2023-05-08T18:00:35Z Optical instruments can rapidly determine numbers and characteristics of water column particles with high sensitivity. Here we show the usefulness of optically assessed total particle volume below the main pycnocline to estimate carbon export in two systems: the open subarctic North Atlantic and the Ross Sea, Antarctica. Both regions exhibit seasonally high phytoplankton production and efficient export (i.e., a strong biological pump). Total particle volumes in the mesopelagic (200-300 m) were significantly correlated with those in the overlying surface mixed layer (50-60 m), indicating that most particles at depth reflect export from the surface. This connectivity, however, is modulated by the physical structure of the water column and by particle type (e.g., the presence of colonies of the haptophyte Phaeocystis antarctica versus diatoms). Evidence from both regions show that a strong pycnocline can delay or may even prevent particles from settling to deeper layers, which then succumb to disintegration, and microbial and zooplankton consumption. Strong katabatic winds in the Ross Sea may deepen the mixed layer, causing a rapid transfer of particles to mesopelagic depths through the mixed-layer pump. Independent estimates of seasonally integrated export production in the Ross Sea, based on upper water column carbon mass balance, were significantly correlated (in the order of shared variance) with (1) total particle volumes from images, (2) particulate organic carbon, and (3) chlorophyll fluorescence, all recorded at a depth range of 200-300 m. Carbon export was not significantly correlated with particle abundance measured by a Coulter counter at the same depth range. Measuring total particle volume below the primary pycnocline is therefore a useful approach to estimate carbon export at least in regions characterized by seasonally high particle export. Article in Journal/Newspaper Antarc* Antarctica North Atlantic Ross Sea Subarctic Old Dominion University: ODU Digital Commons Ross Sea Coulter ENVELOPE(-58.033,-58.033,-83.283,-83.283) Frontiers in Marine Science 6 |
institution |
Open Polar |
collection |
Old Dominion University: ODU Digital Commons |
op_collection_id |
ftolddominionuni |
language |
unknown |
topic |
Biological pump Particle flux Antarctica Atlantic Carbon export Biogeochemistry Environmental Sciences Oceanography |
spellingShingle |
Biological pump Particle flux Antarctica Atlantic Carbon export Biogeochemistry Environmental Sciences Oceanography Bochdansky, Alexander B. Dunbar, Robert B. Hansell, Dennis A. Herndl, Gerhard J. Estimating Carbon Flux From Optically Recording Total Particle Volume at Depths Below the Primary Pycnocline |
topic_facet |
Biological pump Particle flux Antarctica Atlantic Carbon export Biogeochemistry Environmental Sciences Oceanography |
description |
Optical instruments can rapidly determine numbers and characteristics of water column particles with high sensitivity. Here we show the usefulness of optically assessed total particle volume below the main pycnocline to estimate carbon export in two systems: the open subarctic North Atlantic and the Ross Sea, Antarctica. Both regions exhibit seasonally high phytoplankton production and efficient export (i.e., a strong biological pump). Total particle volumes in the mesopelagic (200-300 m) were significantly correlated with those in the overlying surface mixed layer (50-60 m), indicating that most particles at depth reflect export from the surface. This connectivity, however, is modulated by the physical structure of the water column and by particle type (e.g., the presence of colonies of the haptophyte Phaeocystis antarctica versus diatoms). Evidence from both regions show that a strong pycnocline can delay or may even prevent particles from settling to deeper layers, which then succumb to disintegration, and microbial and zooplankton consumption. Strong katabatic winds in the Ross Sea may deepen the mixed layer, causing a rapid transfer of particles to mesopelagic depths through the mixed-layer pump. Independent estimates of seasonally integrated export production in the Ross Sea, based on upper water column carbon mass balance, were significantly correlated (in the order of shared variance) with (1) total particle volumes from images, (2) particulate organic carbon, and (3) chlorophyll fluorescence, all recorded at a depth range of 200-300 m. Carbon export was not significantly correlated with particle abundance measured by a Coulter counter at the same depth range. Measuring total particle volume below the primary pycnocline is therefore a useful approach to estimate carbon export at least in regions characterized by seasonally high particle export. |
format |
Article in Journal/Newspaper |
author |
Bochdansky, Alexander B. Dunbar, Robert B. Hansell, Dennis A. Herndl, Gerhard J. |
author_facet |
Bochdansky, Alexander B. Dunbar, Robert B. Hansell, Dennis A. Herndl, Gerhard J. |
author_sort |
Bochdansky, Alexander B. |
title |
Estimating Carbon Flux From Optically Recording Total Particle Volume at Depths Below the Primary Pycnocline |
title_short |
Estimating Carbon Flux From Optically Recording Total Particle Volume at Depths Below the Primary Pycnocline |
title_full |
Estimating Carbon Flux From Optically Recording Total Particle Volume at Depths Below the Primary Pycnocline |
title_fullStr |
Estimating Carbon Flux From Optically Recording Total Particle Volume at Depths Below the Primary Pycnocline |
title_full_unstemmed |
Estimating Carbon Flux From Optically Recording Total Particle Volume at Depths Below the Primary Pycnocline |
title_sort |
estimating carbon flux from optically recording total particle volume at depths below the primary pycnocline |
publisher |
ODU Digital Commons |
publishDate |
2019 |
url |
https://digitalcommons.odu.edu/oeas_fac_pubs/377 https://doi.org/10.3389/fmars.2019.00778 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1388/viewcontent/Bochdansky_2019_Estimating_carbon_flux_from_op.pdf |
long_lat |
ENVELOPE(-58.033,-58.033,-83.283,-83.283) |
geographic |
Ross Sea Coulter |
geographic_facet |
Ross Sea Coulter |
genre |
Antarc* Antarctica North Atlantic Ross Sea Subarctic |
genre_facet |
Antarc* Antarctica North Atlantic Ross Sea Subarctic |
op_source |
OES Faculty Publications |
op_relation |
https://digitalcommons.odu.edu/oeas_fac_pubs/377 doi:10.3389/fmars.2019.00778 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1388/viewcontent/Bochdansky_2019_Estimating_carbon_flux_from_op.pdf |
op_rights |
© 2019 Bochdansky, Dunbar, Hansell and Herndl. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CCBY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
op_doi |
https://doi.org/10.3389/fmars.2019.00778 |
container_title |
Frontiers in Marine Science |
container_volume |
6 |
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1768377735291338752 |