Particle export during the Southern Ocean Iron Experiment (SOFeX). Limnology and Oceanography

We studied the effect of iron addition on particle export in the Southern Ocean by measuring changes in the distribution of thorium-234 during a 4-week iron (Fe) enrichment experiment conducted in the high-silicate high-nitrate waters just south of the Southern Antarctic Circumpolar Current Front at...

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Main Authors: K. O. Buesseler, J. E. Andrews, S. M. Pike, M. A. Charette, L. E. Goldson, M. A. Brzezinski, V. P. Lance
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 2005
Subjects:
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.2075
http://www.aslo.org/lo/toc/vol_50/issue_1/0311.pdf
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spelling ftciteseerx:oai:CiteSeerX.psu:10.1.1.507.2075 2023-05-15T13:45:47+02:00 Particle export during the Southern Ocean Iron Experiment (SOFeX). Limnology and Oceanography K. O. Buesseler J. E. Andrews S. M. Pike M. A. Charette L. E. Goldson M. A. Brzezinski V. P. Lance The Pennsylvania State University CiteSeerX Archives 2005 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.2075 http://www.aslo.org/lo/toc/vol_50/issue_1/0311.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.2075 http://www.aslo.org/lo/toc/vol_50/issue_1/0311.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.aslo.org/lo/toc/vol_50/issue_1/0311.pdf text 2005 ftciteseerx 2016-01-08T09:25:49Z We studied the effect of iron addition on particle export in the Southern Ocean by measuring changes in the distribution of thorium-234 during a 4-week iron (Fe) enrichment experiment conducted in the high-silicate high-nitrate waters just south of the Southern Antarctic Circumpolar Current Front at 172.58W. Decreases in 234Th activity with time in the fertilized mixed layer (0–50 m) exceeded those in unfertilized waters, indicating enhanced export of 234Th on sinking particles after Fe enrichment. The addition of Fe also affected export below the fertilized patch by increasing the efficiency of particle export through the 100-m depth horizon. Extensive temporal and vertical Lagrangian sampling allowed us to make a detailed examination of the 234Th flux model, which was used to quantify the fluxes of particulate organic carbon (POC) and biogenic silica (bSiO2). Iron addition increased the flux of both POC and bSiO2 out of the mixed layer by about 300%. The flux at 100 m increased by more than 700 % and 600% for POC and bSiO2, respectively. The absolute magnitude of the POC and bSiO2 fluxes were not large relative to natural blooms at these latitudes or to those found in association with the termination of blooms in other ocean regions. Our results support the hypothesis that Fe addition leads directly to significant particle export and seques-tration of C in the deep ocean. This is a key link between ocean Fe inputs and past changes in atmospheric CO2 and climate. Text Antarc* Antarctic Southern Ocean Unknown Antarctic Southern Ocean
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description We studied the effect of iron addition on particle export in the Southern Ocean by measuring changes in the distribution of thorium-234 during a 4-week iron (Fe) enrichment experiment conducted in the high-silicate high-nitrate waters just south of the Southern Antarctic Circumpolar Current Front at 172.58W. Decreases in 234Th activity with time in the fertilized mixed layer (0–50 m) exceeded those in unfertilized waters, indicating enhanced export of 234Th on sinking particles after Fe enrichment. The addition of Fe also affected export below the fertilized patch by increasing the efficiency of particle export through the 100-m depth horizon. Extensive temporal and vertical Lagrangian sampling allowed us to make a detailed examination of the 234Th flux model, which was used to quantify the fluxes of particulate organic carbon (POC) and biogenic silica (bSiO2). Iron addition increased the flux of both POC and bSiO2 out of the mixed layer by about 300%. The flux at 100 m increased by more than 700 % and 600% for POC and bSiO2, respectively. The absolute magnitude of the POC and bSiO2 fluxes were not large relative to natural blooms at these latitudes or to those found in association with the termination of blooms in other ocean regions. Our results support the hypothesis that Fe addition leads directly to significant particle export and seques-tration of C in the deep ocean. This is a key link between ocean Fe inputs and past changes in atmospheric CO2 and climate.
author2 The Pennsylvania State University CiteSeerX Archives
format Text
author K. O. Buesseler
J. E. Andrews
S. M. Pike
M. A. Charette
L. E. Goldson
M. A. Brzezinski
V. P. Lance
spellingShingle K. O. Buesseler
J. E. Andrews
S. M. Pike
M. A. Charette
L. E. Goldson
M. A. Brzezinski
V. P. Lance
Particle export during the Southern Ocean Iron Experiment (SOFeX). Limnology and Oceanography
author_facet K. O. Buesseler
J. E. Andrews
S. M. Pike
M. A. Charette
L. E. Goldson
M. A. Brzezinski
V. P. Lance
author_sort K. O. Buesseler
title Particle export during the Southern Ocean Iron Experiment (SOFeX). Limnology and Oceanography
title_short Particle export during the Southern Ocean Iron Experiment (SOFeX). Limnology and Oceanography
title_full Particle export during the Southern Ocean Iron Experiment (SOFeX). Limnology and Oceanography
title_fullStr Particle export during the Southern Ocean Iron Experiment (SOFeX). Limnology and Oceanography
title_full_unstemmed Particle export during the Southern Ocean Iron Experiment (SOFeX). Limnology and Oceanography
title_sort particle export during the southern ocean iron experiment (sofex). limnology and oceanography
publishDate 2005
url http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.2075
http://www.aslo.org/lo/toc/vol_50/issue_1/0311.pdf
geographic Antarctic
Southern Ocean
geographic_facet Antarctic
Southern Ocean
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Southern Ocean
genre_facet Antarc*
Antarctic
Southern Ocean
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http://www.aslo.org/lo/toc/vol_50/issue_1/0311.pdf
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