A carbon budget for a naturally iron fertilized bloom in the Southern Ocean
Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 25 (2011): GB3004, doi:10.1029/2010GB003780. Subantarctic islands...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/4738 2023-05-15T15:59:34+02:00 A carbon budget for a naturally iron fertilized bloom in the Southern Ocean Morris, Paul J. Sanders, Richard J. 2011-07-08 application/msword text/plain application/pdf https://hdl.handle.net/1912/4738 en_US eng American Geophysical Union https://doi.org/10.1029/2010GB003780 Global Biogeochemical Cycles 25 (2011): GB3004 https://hdl.handle.net/1912/4738 doi:10.1029/2010GB003780 Global Biogeochemical Cycles 25 (2011): GB3004 doi:10.1029/2010GB003780 Silicon budget CROZEX POC HNLC Carbon export Article 2011 ftwhoas https://doi.org/10.1029/2010GB003780 2022-05-28T22:58:25Z Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 25 (2011): GB3004, doi:10.1029/2010GB003780. Subantarctic islands in the high-nutrient, low-chlorophyll (HNLC) Southern Ocean are natural sources of iron and stimulate blooms in their proximity, such as the one observed close to the Crozet Islands (52°E, 46°S). During 2004/2005, particulate organic carbon (POC) export was measured using the 234Th technique in the Crozet bloom and compared with an HNLC control region. Initial results showed that iron release had no effect on daily POC export rates, thus any iron-driven enhancement in POC export was due to a longer export phase in the bloom region when compared to the control region. The duration of the export event was empirically estimated by closing the silicon budget, thus allowing seasonal POC export to be calculated by applying the export duration to the daily rates of POC export. This yields a seasonal estimate of POC export that is 3.6 times larger (range 1.9–7.1) in the iron-fertilized region than in the HNLC control region. These estimates of POC export were then compared to independent estimates of organic matter storage in the upper ocean, which are significant in both the HNLC and control regions. Overall, integrated POC export was significantly (approximately 50%) lower than estimated seasonal new production, the fraction of production that is supported by inputs of new nutrients. Finally, the sequestration efficiency, the numerical relationship between the supply of the limiting nutrient, iron, and the key ecosystem function of POC export at 100 m, is estimated to be 16,790 mol:mol. Funding for CROZEX came from the NERC core strategic program BICEP. Article in Journal/Newspaper Crozet Islands Southern Ocean Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Southern Ocean Global Biogeochemical Cycles 25 3 n/a n/a |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Silicon budget CROZEX POC HNLC Carbon export |
spellingShingle |
Silicon budget CROZEX POC HNLC Carbon export Morris, Paul J. Sanders, Richard J. A carbon budget for a naturally iron fertilized bloom in the Southern Ocean |
topic_facet |
Silicon budget CROZEX POC HNLC Carbon export |
description |
Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 25 (2011): GB3004, doi:10.1029/2010GB003780. Subantarctic islands in the high-nutrient, low-chlorophyll (HNLC) Southern Ocean are natural sources of iron and stimulate blooms in their proximity, such as the one observed close to the Crozet Islands (52°E, 46°S). During 2004/2005, particulate organic carbon (POC) export was measured using the 234Th technique in the Crozet bloom and compared with an HNLC control region. Initial results showed that iron release had no effect on daily POC export rates, thus any iron-driven enhancement in POC export was due to a longer export phase in the bloom region when compared to the control region. The duration of the export event was empirically estimated by closing the silicon budget, thus allowing seasonal POC export to be calculated by applying the export duration to the daily rates of POC export. This yields a seasonal estimate of POC export that is 3.6 times larger (range 1.9–7.1) in the iron-fertilized region than in the HNLC control region. These estimates of POC export were then compared to independent estimates of organic matter storage in the upper ocean, which are significant in both the HNLC and control regions. Overall, integrated POC export was significantly (approximately 50%) lower than estimated seasonal new production, the fraction of production that is supported by inputs of new nutrients. Finally, the sequestration efficiency, the numerical relationship between the supply of the limiting nutrient, iron, and the key ecosystem function of POC export at 100 m, is estimated to be 16,790 mol:mol. Funding for CROZEX came from the NERC core strategic program BICEP. |
format |
Article in Journal/Newspaper |
author |
Morris, Paul J. Sanders, Richard J. |
author_facet |
Morris, Paul J. Sanders, Richard J. |
author_sort |
Morris, Paul J. |
title |
A carbon budget for a naturally iron fertilized bloom in the Southern Ocean |
title_short |
A carbon budget for a naturally iron fertilized bloom in the Southern Ocean |
title_full |
A carbon budget for a naturally iron fertilized bloom in the Southern Ocean |
title_fullStr |
A carbon budget for a naturally iron fertilized bloom in the Southern Ocean |
title_full_unstemmed |
A carbon budget for a naturally iron fertilized bloom in the Southern Ocean |
title_sort |
carbon budget for a naturally iron fertilized bloom in the southern ocean |
publisher |
American Geophysical Union |
publishDate |
2011 |
url |
https://hdl.handle.net/1912/4738 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Crozet Islands Southern Ocean |
genre_facet |
Crozet Islands Southern Ocean |
op_source |
Global Biogeochemical Cycles 25 (2011): GB3004 doi:10.1029/2010GB003780 |
op_relation |
https://doi.org/10.1029/2010GB003780 Global Biogeochemical Cycles 25 (2011): GB3004 https://hdl.handle.net/1912/4738 doi:10.1029/2010GB003780 |
op_doi |
https://doi.org/10.1029/2010GB003780 |
container_title |
Global Biogeochemical Cycles |
container_volume |
25 |
container_issue |
3 |
container_start_page |
n/a |
op_container_end_page |
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1766395504627810304 |