Dissolved iron distribution in the western and central subarctic Pacific: HNLC water formation and biogeochemical processes
Abstract It is well known that phytoplankton growth is broadly limited by iron (Fe) availability in the subarctic Pacific. To investigate which Fe sources control the amplitude of seasonal variation in biogeochemical parameters in the subarctic Pacific, we examined the spatial variation in the west‐...
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crwiley:10.1002/lno.10548 2024-10-06T13:53:01+00:00 Dissolved iron distribution in the western and central subarctic Pacific: HNLC water formation and biogeochemical processes Nishioka, Jun Obata, Hajime Ministry of Education, Culture, Sports, Science and Technology 2017 http://dx.doi.org/10.1002/lno.10548 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.10548 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002%2Flno.10548 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10548 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 62, issue 5, page 2004-2022 ISSN 0024-3590 1939-5590 journal-article 2017 crwiley https://doi.org/10.1002/lno.10548 2024-09-11T04:13:01Z Abstract It is well known that phytoplankton growth is broadly limited by iron (Fe) availability in the subarctic Pacific. To investigate which Fe sources control the amplitude of seasonal variation in biogeochemical parameters in the subarctic Pacific, we examined the spatial variation in the west‐to‐east distribution of dissolved Fe (DFe) across the western and central subarctic Pacific through the Japanese GEOTRACES program. The vertical section profile of the western subarctic Pacific gyre showed high dissolved Fe concentrations from the bottom of the surface mixed layer to as deep as approximately 3000 m, suggesting that Fe‐rich intermediate water is transported laterally and distributed across the western subarctic gyre, over 2000 km. The section data also indicate that the influence of the western Fe‐rich intermediate water does not reach the Alaskan gyre. Fe* index (= [DFe] (observed) – [PO 4 ] (observed) × RFe : P) distribution clearly indicates that the western Fe‐rich intermediate water is well explained by external sedimentary Fe sources and water transport systems from a subpolar marginal sea, the Sea of Okhotsk, and the continental margin. The spatial pattern of Fe to nutrient stoichiometry supplied from the intermediate water to the surface, in comparison with reported Fe and nutrient demand in surface phytoplankton, quantitatively explains the differences in surface macronutrient consumption between the western and eastern gyre as well as the formation of the high nutrient and low chlorophyll region in the whole subarctic Pacific. Article in Journal/Newspaper Subarctic Wiley Online Library Okhotsk Pacific Limnology and Oceanography 62 5 2004 2022 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract It is well known that phytoplankton growth is broadly limited by iron (Fe) availability in the subarctic Pacific. To investigate which Fe sources control the amplitude of seasonal variation in biogeochemical parameters in the subarctic Pacific, we examined the spatial variation in the west‐to‐east distribution of dissolved Fe (DFe) across the western and central subarctic Pacific through the Japanese GEOTRACES program. The vertical section profile of the western subarctic Pacific gyre showed high dissolved Fe concentrations from the bottom of the surface mixed layer to as deep as approximately 3000 m, suggesting that Fe‐rich intermediate water is transported laterally and distributed across the western subarctic gyre, over 2000 km. The section data also indicate that the influence of the western Fe‐rich intermediate water does not reach the Alaskan gyre. Fe* index (= [DFe] (observed) – [PO 4 ] (observed) × RFe : P) distribution clearly indicates that the western Fe‐rich intermediate water is well explained by external sedimentary Fe sources and water transport systems from a subpolar marginal sea, the Sea of Okhotsk, and the continental margin. The spatial pattern of Fe to nutrient stoichiometry supplied from the intermediate water to the surface, in comparison with reported Fe and nutrient demand in surface phytoplankton, quantitatively explains the differences in surface macronutrient consumption between the western and eastern gyre as well as the formation of the high nutrient and low chlorophyll region in the whole subarctic Pacific. |
author2 |
Ministry of Education, Culture, Sports, Science and Technology |
format |
Article in Journal/Newspaper |
author |
Nishioka, Jun Obata, Hajime |
spellingShingle |
Nishioka, Jun Obata, Hajime Dissolved iron distribution in the western and central subarctic Pacific: HNLC water formation and biogeochemical processes |
author_facet |
Nishioka, Jun Obata, Hajime |
author_sort |
Nishioka, Jun |
title |
Dissolved iron distribution in the western and central subarctic Pacific: HNLC water formation and biogeochemical processes |
title_short |
Dissolved iron distribution in the western and central subarctic Pacific: HNLC water formation and biogeochemical processes |
title_full |
Dissolved iron distribution in the western and central subarctic Pacific: HNLC water formation and biogeochemical processes |
title_fullStr |
Dissolved iron distribution in the western and central subarctic Pacific: HNLC water formation and biogeochemical processes |
title_full_unstemmed |
Dissolved iron distribution in the western and central subarctic Pacific: HNLC water formation and biogeochemical processes |
title_sort |
dissolved iron distribution in the western and central subarctic pacific: hnlc water formation and biogeochemical processes |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1002/lno.10548 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.10548 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002%2Flno.10548 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.10548 |
geographic |
Okhotsk Pacific |
geographic_facet |
Okhotsk Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Limnology and Oceanography volume 62, issue 5, page 2004-2022 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/lno.10548 |
container_title |
Limnology and Oceanography |
container_volume |
62 |
container_issue |
5 |
container_start_page |
2004 |
op_container_end_page |
2022 |
_version_ |
1812181645815447552 |