Controls on dissolved and particulate iron distribution in surface waters of the Western Antarctic Peninsula shelf
The Western Antarctic Peninsula (WAP) displays high but variable productivity and is also undergoing rapid change. Long-term studies of phytoplankton communities and primary production have suggested transient limitation by the micronutrient iron (Fe), but to date no data have been available to test...
Published in: | Marine Chemistry |
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Online Access: | http://nora.nerc.ac.uk/id/eprint/514382/ https://nora.nerc.ac.uk/id/eprint/514382/1/Controls%20on%20dissolved%20and%20particulate%20iron%20distributions%20in%20surface%20waters%20of%20the%20Western%20Antarctic%20Peninsula%20shelf%20AAM.pdf http://www.sciencedirect.com/science/article/pii/S0304420316301578 |
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ftnerc:oai:nora.nerc.ac.uk:514382 2023-05-15T13:49:33+02:00 Controls on dissolved and particulate iron distribution in surface waters of the Western Antarctic Peninsula shelf Annett, Amber L. Fitzsimmons, Jessica N. Séguret, Marie J.M. Lagerstrom, Maria Meredith, Michael P. Schofield, Oscar Sherrell, Robert M. 2017-11 text http://nora.nerc.ac.uk/id/eprint/514382/ https://nora.nerc.ac.uk/id/eprint/514382/1/Controls%20on%20dissolved%20and%20particulate%20iron%20distributions%20in%20surface%20waters%20of%20the%20Western%20Antarctic%20Peninsula%20shelf%20AAM.pdf http://www.sciencedirect.com/science/article/pii/S0304420316301578 en eng Elsevier https://nora.nerc.ac.uk/id/eprint/514382/1/Controls%20on%20dissolved%20and%20particulate%20iron%20distributions%20in%20surface%20waters%20of%20the%20Western%20Antarctic%20Peninsula%20shelf%20AAM.pdf Annett, Amber L.; Fitzsimmons, Jessica N.; Séguret, Marie J.M.; Lagerstrom, Maria; Meredith, Michael P. orcid:0000-0002-7342-7756 Schofield, Oscar; Sherrell, Robert M. 2017 Controls on dissolved and particulate iron distribution in surface waters of the Western Antarctic Peninsula shelf. Marine Chemistry, 196. 81-97. https://doi.org/10.1016/j.marchem.2017.06.004 <https://doi.org/10.1016/j.marchem.2017.06.004> Marine Sciences Chemistry Publication - Article PeerReviewed 2017 ftnerc https://doi.org/10.1016/j.marchem.2017.06.004 2023-02-04T19:43:29Z The Western Antarctic Peninsula (WAP) displays high but variable productivity and is also undergoing rapid change. Long-term studies of phytoplankton communities and primary production have suggested transient limitation by the micronutrient iron (Fe), but to date no data have been available to test this hypothesis. Here, we present the first spatially extensive, multi-year measurements of dissolved and particulate trace metals in surface waters to investigate the key sources and sinks of Fe in the central WAP shelf. Surface samples of dissolved and particulate metals were collected throughout the 700 × 200 km grid of the Palmer Long-Term Ecological Research program in three consecutive austral summers (2010 − 2012). Iron concentrations varied widely. Both dissolved and particulate Fe were high in coastal waters (up to 8 nmol kg− 1 and 42 nmol kg− 1, respectively). In contrast, very low Fe concentrations (< 0.1 nmol kg− 1) were widespread in mid- to outer-shelf surface waters, especially in the northern half of the sampling grid, suggesting possible Fe limitation of primary production on the shelf. Sea ice and dust inputs of Fe were minor, although their relative importance increased with distance from shore due to the larger near-shore sources. Sedimentary inputs were inferred from manganese distributions; these were more significant in the northern portion of the grid, and showed interannual variation in intensity. Overall, the interannual distribution of Fe was most closely correlated to that of meteoric water (glacial melt and precipitation). Although the Fe concentrations and relative contributions of dissolved and particulate Fe attributed to meltwater were variable throughout the sampling region, increasing glacial meltwater flux can be expected to increase the delivery of Fe to surface waters of the coastal WAP in the future. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Sea ice Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Austral Marine Chemistry 196 81 97 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Marine Sciences Chemistry |
spellingShingle |
Marine Sciences Chemistry Annett, Amber L. Fitzsimmons, Jessica N. Séguret, Marie J.M. Lagerstrom, Maria Meredith, Michael P. Schofield, Oscar Sherrell, Robert M. Controls on dissolved and particulate iron distribution in surface waters of the Western Antarctic Peninsula shelf |
topic_facet |
Marine Sciences Chemistry |
description |
The Western Antarctic Peninsula (WAP) displays high but variable productivity and is also undergoing rapid change. Long-term studies of phytoplankton communities and primary production have suggested transient limitation by the micronutrient iron (Fe), but to date no data have been available to test this hypothesis. Here, we present the first spatially extensive, multi-year measurements of dissolved and particulate trace metals in surface waters to investigate the key sources and sinks of Fe in the central WAP shelf. Surface samples of dissolved and particulate metals were collected throughout the 700 × 200 km grid of the Palmer Long-Term Ecological Research program in three consecutive austral summers (2010 − 2012). Iron concentrations varied widely. Both dissolved and particulate Fe were high in coastal waters (up to 8 nmol kg− 1 and 42 nmol kg− 1, respectively). In contrast, very low Fe concentrations (< 0.1 nmol kg− 1) were widespread in mid- to outer-shelf surface waters, especially in the northern half of the sampling grid, suggesting possible Fe limitation of primary production on the shelf. Sea ice and dust inputs of Fe were minor, although their relative importance increased with distance from shore due to the larger near-shore sources. Sedimentary inputs were inferred from manganese distributions; these were more significant in the northern portion of the grid, and showed interannual variation in intensity. Overall, the interannual distribution of Fe was most closely correlated to that of meteoric water (glacial melt and precipitation). Although the Fe concentrations and relative contributions of dissolved and particulate Fe attributed to meltwater were variable throughout the sampling region, increasing glacial meltwater flux can be expected to increase the delivery of Fe to surface waters of the coastal WAP in the future. |
format |
Article in Journal/Newspaper |
author |
Annett, Amber L. Fitzsimmons, Jessica N. Séguret, Marie J.M. Lagerstrom, Maria Meredith, Michael P. Schofield, Oscar Sherrell, Robert M. |
author_facet |
Annett, Amber L. Fitzsimmons, Jessica N. Séguret, Marie J.M. Lagerstrom, Maria Meredith, Michael P. Schofield, Oscar Sherrell, Robert M. |
author_sort |
Annett, Amber L. |
title |
Controls on dissolved and particulate iron distribution in surface waters of the Western Antarctic Peninsula shelf |
title_short |
Controls on dissolved and particulate iron distribution in surface waters of the Western Antarctic Peninsula shelf |
title_full |
Controls on dissolved and particulate iron distribution in surface waters of the Western Antarctic Peninsula shelf |
title_fullStr |
Controls on dissolved and particulate iron distribution in surface waters of the Western Antarctic Peninsula shelf |
title_full_unstemmed |
Controls on dissolved and particulate iron distribution in surface waters of the Western Antarctic Peninsula shelf |
title_sort |
controls on dissolved and particulate iron distribution in surface waters of the western antarctic peninsula shelf |
publisher |
Elsevier |
publishDate |
2017 |
url |
http://nora.nerc.ac.uk/id/eprint/514382/ https://nora.nerc.ac.uk/id/eprint/514382/1/Controls%20on%20dissolved%20and%20particulate%20iron%20distributions%20in%20surface%20waters%20of%20the%20Western%20Antarctic%20Peninsula%20shelf%20AAM.pdf http://www.sciencedirect.com/science/article/pii/S0304420316301578 |
geographic |
Antarctic Antarctic Peninsula Austral |
geographic_facet |
Antarctic Antarctic Peninsula Austral |
genre |
Antarc* Antarctic Antarctic Peninsula Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/514382/1/Controls%20on%20dissolved%20and%20particulate%20iron%20distributions%20in%20surface%20waters%20of%20the%20Western%20Antarctic%20Peninsula%20shelf%20AAM.pdf Annett, Amber L.; Fitzsimmons, Jessica N.; Séguret, Marie J.M.; Lagerstrom, Maria; Meredith, Michael P. orcid:0000-0002-7342-7756 Schofield, Oscar; Sherrell, Robert M. 2017 Controls on dissolved and particulate iron distribution in surface waters of the Western Antarctic Peninsula shelf. Marine Chemistry, 196. 81-97. https://doi.org/10.1016/j.marchem.2017.06.004 <https://doi.org/10.1016/j.marchem.2017.06.004> |
op_doi |
https://doi.org/10.1016/j.marchem.2017.06.004 |
container_title |
Marine Chemistry |
container_volume |
196 |
container_start_page |
81 |
op_container_end_page |
97 |
_version_ |
1766251542121283584 |