Wintertime pytoplankton bloom in the Subarctic Pacific supportedby continental margin iron
Heightened biological activity was observed in February 1996in the high-nutrient low-chlorophyll (HNLC) subarctic North PacificOcean, a region that is thought to beiron-limited. Here we provideevidence supporting the hypothesis that Ocean Station Papa (OSP) in thesubarctic Pacific received a lateral...
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Lawrence Berkeley National Laboratory
2004
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ftunivnotexas:info:ark/67531/metadc893683 2023-05-15T18:28:12+02:00 Wintertime pytoplankton bloom in the Subarctic Pacific supportedby continental margin iron Lam, Phoebe J. Bishop, James K.B. Henning, Cara C. Marcus,Matthew A. Waychunas, Glenn A. Fung, Inez USDOE Director. Office of Science. Biological andEnvironmental Research, Office of Basic Energy Sciences, MaterialsScience and Engineering Division National Science FoundationATM-9987457 2004-06-08 Text http://digital.library.unt.edu/ark:/67531/metadc893683/ English eng Lawrence Berkeley National Laboratory rep-no: LBNL--55467 grantno: DE-AC02-05CH11231 grantno: NSF:ATM-9987457 osti: 929078 http://digital.library.unt.edu/ark:/67531/metadc893683/ ark: ark:/67531/metadc893683 Journal Name: Global Biogeochemical Cycles; Journal Volume: 20; Journal Issue: GB1006; Related Information: Journal Publication Date: 2006 Pacific Ocean Particulates 58 Hot Spots General Circulation Models Aleutian Islands Phytoplankton Depth Spatial Distribution Continental Margin Hypothesis Iron Chemistry Availability Synchrotrons Article 2004 ftunivnotexas 2016-10-01T22:12:19Z Heightened biological activity was observed in February 1996in the high-nutrient low-chlorophyll (HNLC) subarctic North PacificOcean, a region that is thought to beiron-limited. Here we provideevidence supporting the hypothesis that Ocean Station Papa (OSP) in thesubarctic Pacific received a lateral supply of particulate iron from thecontinental margin off the Aleutian Islands in the winter, coincidentwith the observed biological bloom. Synchrotron X-ray analysis was usedto describe the physical form, chemistry, and depth distributions of ironin size fractionated particulate matter samples. The analysis revealsthat discrete micron-sized iron-rich hotspots are ubiquitous in the upper200m at OSP, more than 900km from the closest coast. The specifics of thechemistry and depth profiles of the Fe hot spots trace them to thecontinental margins. We thus hypothesize that iron hotspots are a markerfor the delivery of iron from the continental margin. We confirm thedelivery of continental margin iron to the open ocean using an oceangeneral circulation model with an iron-like tracer source at thecontinental margin. We suggest that iron from the continental marginstimulated a wintertime phytoplankton bloom, partially relieving the HNLCcondition. Article in Journal/Newspaper Subarctic Aleutian Islands University of North Texas: UNT Digital Library Pacific |
institution |
Open Polar |
collection |
University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Pacific Ocean Particulates 58 Hot Spots General Circulation Models Aleutian Islands Phytoplankton Depth Spatial Distribution Continental Margin Hypothesis Iron Chemistry Availability Synchrotrons |
spellingShingle |
Pacific Ocean Particulates 58 Hot Spots General Circulation Models Aleutian Islands Phytoplankton Depth Spatial Distribution Continental Margin Hypothesis Iron Chemistry Availability Synchrotrons Lam, Phoebe J. Bishop, James K.B. Henning, Cara C. Marcus,Matthew A. Waychunas, Glenn A. Fung, Inez Wintertime pytoplankton bloom in the Subarctic Pacific supportedby continental margin iron |
topic_facet |
Pacific Ocean Particulates 58 Hot Spots General Circulation Models Aleutian Islands Phytoplankton Depth Spatial Distribution Continental Margin Hypothesis Iron Chemistry Availability Synchrotrons |
description |
Heightened biological activity was observed in February 1996in the high-nutrient low-chlorophyll (HNLC) subarctic North PacificOcean, a region that is thought to beiron-limited. Here we provideevidence supporting the hypothesis that Ocean Station Papa (OSP) in thesubarctic Pacific received a lateral supply of particulate iron from thecontinental margin off the Aleutian Islands in the winter, coincidentwith the observed biological bloom. Synchrotron X-ray analysis was usedto describe the physical form, chemistry, and depth distributions of ironin size fractionated particulate matter samples. The analysis revealsthat discrete micron-sized iron-rich hotspots are ubiquitous in the upper200m at OSP, more than 900km from the closest coast. The specifics of thechemistry and depth profiles of the Fe hot spots trace them to thecontinental margins. We thus hypothesize that iron hotspots are a markerfor the delivery of iron from the continental margin. We confirm thedelivery of continental margin iron to the open ocean using an oceangeneral circulation model with an iron-like tracer source at thecontinental margin. We suggest that iron from the continental marginstimulated a wintertime phytoplankton bloom, partially relieving the HNLCcondition. |
author2 |
USDOE Director. Office of Science. Biological andEnvironmental Research, Office of Basic Energy Sciences, MaterialsScience and Engineering Division National Science FoundationATM-9987457 |
format |
Article in Journal/Newspaper |
author |
Lam, Phoebe J. Bishop, James K.B. Henning, Cara C. Marcus,Matthew A. Waychunas, Glenn A. Fung, Inez |
author_facet |
Lam, Phoebe J. Bishop, James K.B. Henning, Cara C. Marcus,Matthew A. Waychunas, Glenn A. Fung, Inez |
author_sort |
Lam, Phoebe J. |
title |
Wintertime pytoplankton bloom in the Subarctic Pacific supportedby continental margin iron |
title_short |
Wintertime pytoplankton bloom in the Subarctic Pacific supportedby continental margin iron |
title_full |
Wintertime pytoplankton bloom in the Subarctic Pacific supportedby continental margin iron |
title_fullStr |
Wintertime pytoplankton bloom in the Subarctic Pacific supportedby continental margin iron |
title_full_unstemmed |
Wintertime pytoplankton bloom in the Subarctic Pacific supportedby continental margin iron |
title_sort |
wintertime pytoplankton bloom in the subarctic pacific supportedby continental margin iron |
publisher |
Lawrence Berkeley National Laboratory |
publishDate |
2004 |
url |
http://digital.library.unt.edu/ark:/67531/metadc893683/ |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Subarctic Aleutian Islands |
genre_facet |
Subarctic Aleutian Islands |
op_source |
Journal Name: Global Biogeochemical Cycles; Journal Volume: 20; Journal Issue: GB1006; Related Information: Journal Publication Date: 2006 |
op_relation |
rep-no: LBNL--55467 grantno: DE-AC02-05CH11231 grantno: NSF:ATM-9987457 osti: 929078 http://digital.library.unt.edu/ark:/67531/metadc893683/ ark: ark:/67531/metadc893683 |
_version_ |
1766210575267790848 |