Sinking particle properties from polyacrylamide gels during the KErguelen Ocean and Plateau compared Study (KEOPS): Zooplankton control of carbon export in an area of persistent natural iron inputs in the Southern Ocean
The Kerguelen ocean and plateau compared study (KEOPS) examined the origin of elevated phytoplankton biomass in naturally iron-fertilized waters over the Kerguelen plateau during midsummer (January–February 2005). We report sinking particle characteristics determined from image analysis of thousands...
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ftunivtasmania:oai:eprints.utas.edu.au:6298 2023-05-15T18:25:04+02:00 Sinking particle properties from polyacrylamide gels during the KErguelen Ocean and Plateau compared Study (KEOPS): Zooplankton control of carbon export in an area of persistent natural iron inputs in the Southern Ocean Ebersbach, F Trull, TW 2008 application/pdf https://eprints.utas.edu.au/6298/ https://eprints.utas.edu.au/6298/1/ebersbach_and_trull_2008%5B1%5D.pdf en eng https://eprints.utas.edu.au/6298/1/ebersbach_and_trull_2008%5B1%5D.pdf Ebersbach, F and Trull, TW 2008 , 'Sinking particle properties from polyacrylamide gels during the KErguelen Ocean and Plateau compared Study (KEOPS): Zooplankton control of carbon export in an area of persistent natural iron inputs in the Southern Ocean' , Limnology and Oceanography, vol. 53, no. 1 , pp. 212-224 . cc_utas 260401 Biological Oceanography 260402 Chemical Oceanography Article PeerReviewed 2008 ftunivtasmania 2020-05-30T07:20:08Z The Kerguelen ocean and plateau compared study (KEOPS) examined the origin of elevated phytoplankton biomass in naturally iron-fertilized waters over the Kerguelen plateau during midsummer (January–February 2005). We report sinking particle characteristics determined from image analysis of thousands of individual particles collected in viscous polyacrylamide gels placed in free-drifting sediment traps at two sites: a high phytoplankton biomass site over the central plateau (A3) and a moderate biomass site at its periphery (C5). The particles were divided into three types (1) oval fecal pellets, (2) cylindrical fecal pellets, and (3) aggregates. The aggregates were most abundant and mainly consisted of agglomerations of the cylindrical fecal pellets. Conversion of the pellet and aggregate volumes to carbon contents suggests export fluxes of 50–60 mg C m22 d21 at 100-m depth, in reasonable agreement with independent estimates from carbon and 234Th measurements. Our observation that the majority of the particle flux was processed through the heterotrophic foodweb contrasts with the results of artificial iron-fertilization experiments and with models for export from productive diatomdominated waters that emphasize direct export of phytoplankton detritus. The KEOPS results may offer more appropriate scaling for the response of ecosystem structure and carbon export to persistent iron fertilization in the Southern Ocean. Article in Journal/Newspaper Southern Ocean University of Tasmania: UTas ePrints Southern Ocean Kerguelen |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
260401 Biological Oceanography 260402 Chemical Oceanography |
spellingShingle |
260401 Biological Oceanography 260402 Chemical Oceanography Ebersbach, F Trull, TW Sinking particle properties from polyacrylamide gels during the KErguelen Ocean and Plateau compared Study (KEOPS): Zooplankton control of carbon export in an area of persistent natural iron inputs in the Southern Ocean |
topic_facet |
260401 Biological Oceanography 260402 Chemical Oceanography |
description |
The Kerguelen ocean and plateau compared study (KEOPS) examined the origin of elevated phytoplankton biomass in naturally iron-fertilized waters over the Kerguelen plateau during midsummer (January–February 2005). We report sinking particle characteristics determined from image analysis of thousands of individual particles collected in viscous polyacrylamide gels placed in free-drifting sediment traps at two sites: a high phytoplankton biomass site over the central plateau (A3) and a moderate biomass site at its periphery (C5). The particles were divided into three types (1) oval fecal pellets, (2) cylindrical fecal pellets, and (3) aggregates. The aggregates were most abundant and mainly consisted of agglomerations of the cylindrical fecal pellets. Conversion of the pellet and aggregate volumes to carbon contents suggests export fluxes of 50–60 mg C m22 d21 at 100-m depth, in reasonable agreement with independent estimates from carbon and 234Th measurements. Our observation that the majority of the particle flux was processed through the heterotrophic foodweb contrasts with the results of artificial iron-fertilization experiments and with models for export from productive diatomdominated waters that emphasize direct export of phytoplankton detritus. The KEOPS results may offer more appropriate scaling for the response of ecosystem structure and carbon export to persistent iron fertilization in the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Ebersbach, F Trull, TW |
author_facet |
Ebersbach, F Trull, TW |
author_sort |
Ebersbach, F |
title |
Sinking particle properties from polyacrylamide gels during the KErguelen Ocean and Plateau compared Study (KEOPS): Zooplankton control of carbon export in an area of persistent natural iron inputs in the Southern Ocean |
title_short |
Sinking particle properties from polyacrylamide gels during the KErguelen Ocean and Plateau compared Study (KEOPS): Zooplankton control of carbon export in an area of persistent natural iron inputs in the Southern Ocean |
title_full |
Sinking particle properties from polyacrylamide gels during the KErguelen Ocean and Plateau compared Study (KEOPS): Zooplankton control of carbon export in an area of persistent natural iron inputs in the Southern Ocean |
title_fullStr |
Sinking particle properties from polyacrylamide gels during the KErguelen Ocean and Plateau compared Study (KEOPS): Zooplankton control of carbon export in an area of persistent natural iron inputs in the Southern Ocean |
title_full_unstemmed |
Sinking particle properties from polyacrylamide gels during the KErguelen Ocean and Plateau compared Study (KEOPS): Zooplankton control of carbon export in an area of persistent natural iron inputs in the Southern Ocean |
title_sort |
sinking particle properties from polyacrylamide gels during the kerguelen ocean and plateau compared study (keops): zooplankton control of carbon export in an area of persistent natural iron inputs in the southern ocean |
publishDate |
2008 |
url |
https://eprints.utas.edu.au/6298/ https://eprints.utas.edu.au/6298/1/ebersbach_and_trull_2008%5B1%5D.pdf |
geographic |
Southern Ocean Kerguelen |
geographic_facet |
Southern Ocean Kerguelen |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://eprints.utas.edu.au/6298/1/ebersbach_and_trull_2008%5B1%5D.pdf Ebersbach, F and Trull, TW 2008 , 'Sinking particle properties from polyacrylamide gels during the KErguelen Ocean and Plateau compared Study (KEOPS): Zooplankton control of carbon export in an area of persistent natural iron inputs in the Southern Ocean' , Limnology and Oceanography, vol. 53, no. 1 , pp. 212-224 . |
op_rights |
cc_utas |
_version_ |
1766206248810708992 |