A switch from Si(OH) 4 to NO 3 - depletion in the glacial Southern Ocean
[1] Phytoplankton in the Antarctic deplete silicic acid (Si(OH)4) to a far greater extent than they do nitrate (NO3 ). This pattern can be reversed by the addition of iron which dramatically lowers diatom Si(OH)4:NO3 uptake ratios. Higher iron supply during glacial times would thus drive the Antarct...
Main Authors: | , , , , , , , , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
2002
|
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.502.7245 http://www.atmos.ucla.edu/~gruber/teaching/papers_to_read/brzezinski_grl_02.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.502.7245 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.502.7245 2023-05-15T13:44:16+02:00 A switch from Si(OH) 4 to NO 3 - depletion in the glacial Southern Ocean Mark A. Brzezinski Carol J. Pride Valerie M. Franck Daniel M. Sigman Jorge L. Sarmiento Katsumi Matsumoto Nicolas Gruber Greg H. Rau Kenneth H. Coale The Pennsylvania State University CiteSeerX Archives 2002 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.502.7245 http://www.atmos.ucla.edu/~gruber/teaching/papers_to_read/brzezinski_grl_02.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.502.7245 http://www.atmos.ucla.edu/~gruber/teaching/papers_to_read/brzezinski_grl_02.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.atmos.ucla.edu/~gruber/teaching/papers_to_read/brzezinski_grl_02.pdf Paleoceanography 4215 Oceanography General Climate and text 2002 ftciteseerx 2016-01-08T09:13:04Z [1] Phytoplankton in the Antarctic deplete silicic acid (Si(OH)4) to a far greater extent than they do nitrate (NO3 ). This pattern can be reversed by the addition of iron which dramatically lowers diatom Si(OH)4:NO3 uptake ratios. Higher iron supply during glacial times would thus drive the Antarctic towards NO3 depletion with excess Si(OH)4 remaining in surface waters. New d 30Si and d15N records from Antarctic sediments confirm diminished Si(OH)4 use and enhanced NO3 depletion during the last three glaciations. The present low-Si(OH)4 water is transported northward to at least the subtropics. We postulate that the glacial high-Si(OH)4 water similarly may have been transported to the subtropics and beyond. This input of Si(OH)4 may have caused diatoms to displace coccolithophores at low latitudes, weakening the carbonate pump and increasing the depth of organic matter remineralization. These effects may have lowered glacial atmospheric pCO2 by as Text Antarc* Antarctic Southern Ocean Unknown Antarctic Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
Paleoceanography 4215 Oceanography General Climate and |
spellingShingle |
Paleoceanography 4215 Oceanography General Climate and Mark A. Brzezinski Carol J. Pride Valerie M. Franck Daniel M. Sigman Jorge L. Sarmiento Katsumi Matsumoto Nicolas Gruber Greg H. Rau Kenneth H. Coale A switch from Si(OH) 4 to NO 3 - depletion in the glacial Southern Ocean |
topic_facet |
Paleoceanography 4215 Oceanography General Climate and |
description |
[1] Phytoplankton in the Antarctic deplete silicic acid (Si(OH)4) to a far greater extent than they do nitrate (NO3 ). This pattern can be reversed by the addition of iron which dramatically lowers diatom Si(OH)4:NO3 uptake ratios. Higher iron supply during glacial times would thus drive the Antarctic towards NO3 depletion with excess Si(OH)4 remaining in surface waters. New d 30Si and d15N records from Antarctic sediments confirm diminished Si(OH)4 use and enhanced NO3 depletion during the last three glaciations. The present low-Si(OH)4 water is transported northward to at least the subtropics. We postulate that the glacial high-Si(OH)4 water similarly may have been transported to the subtropics and beyond. This input of Si(OH)4 may have caused diatoms to displace coccolithophores at low latitudes, weakening the carbonate pump and increasing the depth of organic matter remineralization. These effects may have lowered glacial atmospheric pCO2 by as |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Mark A. Brzezinski Carol J. Pride Valerie M. Franck Daniel M. Sigman Jorge L. Sarmiento Katsumi Matsumoto Nicolas Gruber Greg H. Rau Kenneth H. Coale |
author_facet |
Mark A. Brzezinski Carol J. Pride Valerie M. Franck Daniel M. Sigman Jorge L. Sarmiento Katsumi Matsumoto Nicolas Gruber Greg H. Rau Kenneth H. Coale |
author_sort |
Mark A. Brzezinski |
title |
A switch from Si(OH) 4 to NO 3 - depletion in the glacial Southern Ocean |
title_short |
A switch from Si(OH) 4 to NO 3 - depletion in the glacial Southern Ocean |
title_full |
A switch from Si(OH) 4 to NO 3 - depletion in the glacial Southern Ocean |
title_fullStr |
A switch from Si(OH) 4 to NO 3 - depletion in the glacial Southern Ocean |
title_full_unstemmed |
A switch from Si(OH) 4 to NO 3 - depletion in the glacial Southern Ocean |
title_sort |
switch from si(oh) 4 to no 3 - depletion in the glacial southern ocean |
publishDate |
2002 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.502.7245 http://www.atmos.ucla.edu/~gruber/teaching/papers_to_read/brzezinski_grl_02.pdf |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
http://www.atmos.ucla.edu/~gruber/teaching/papers_to_read/brzezinski_grl_02.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.502.7245 http://www.atmos.ucla.edu/~gruber/teaching/papers_to_read/brzezinski_grl_02.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766199659719557120 |