Meltwater as a source of potentially bioavailable iron to Antarctica waters
Abstract Recent rapid retreat of glacial front lines and the loss of land ice along the Antarctic margins may play an important role in exporting suspended particulate matter (SPM) potentially rich in bioavailable (defined as ascorbate leachable) iron (Fe A ) to coastal areas of the Southern Ocean....
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crcambridgeupr:10.1017/s095410201600064x 2024-09-15T17:48:08+00:00 Meltwater as a source of potentially bioavailable iron to Antarctica waters Monien, Donata Monien, Patrick Brünjes, Robert Widmer, Tatjana Kappenberg, Arne Silva Busso, Adrian A. Schnetger, Bernhard Brumsack, Hans-Jürgen 2017 http://dx.doi.org/10.1017/s095410201600064x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410201600064X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 29, issue 3, page 277-291 ISSN 0954-1020 1365-2079 journal-article 2017 crcambridgeupr https://doi.org/10.1017/s095410201600064x 2024-07-10T04:03:46Z Abstract Recent rapid retreat of glacial front lines and the loss of land ice along the Antarctic margins may play an important role in exporting suspended particulate matter (SPM) potentially rich in bioavailable (defined as ascorbate leachable) iron (Fe A ) to coastal areas of the Southern Ocean. Sediment ablation is an additional source of iron for this high-nutrient low-chlorophyll region. In Potter Cove, King George Island, meltwater streams discharge up to 18 000 mg l -1 (average 283 mg l -1 ) of slightly weathered, finely ground bedrock particles into coastal waters during the summer. Approximately 15% of this SPM is exported within a low-salinity surface plume into Bransfield Strait. Based on our data, an estimated 12 mg m -2 yr -1 of Fe A is exported from the South Shetland Island land surface (ice-free and subglacial areas) to the surrounding coastal waters. Extrapolated to an area of 2.5x10 4 km 2 , this Fe A input is comparable to the contribution from icebergs and c. 240-fold higher than aeolian input via dust. An observed rise in local sediment accumulation rates suggests that glacial erosion has been increasing over recent decades and that (sub-)glacially derived SPM is becoming more important as a source of iron to the Southern Ocean. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Antarctica Bransfield Strait Iceberg* King George Island Southern Ocean Cambridge University Press Antarctic Science 29 3 277 291 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Recent rapid retreat of glacial front lines and the loss of land ice along the Antarctic margins may play an important role in exporting suspended particulate matter (SPM) potentially rich in bioavailable (defined as ascorbate leachable) iron (Fe A ) to coastal areas of the Southern Ocean. Sediment ablation is an additional source of iron for this high-nutrient low-chlorophyll region. In Potter Cove, King George Island, meltwater streams discharge up to 18 000 mg l -1 (average 283 mg l -1 ) of slightly weathered, finely ground bedrock particles into coastal waters during the summer. Approximately 15% of this SPM is exported within a low-salinity surface plume into Bransfield Strait. Based on our data, an estimated 12 mg m -2 yr -1 of Fe A is exported from the South Shetland Island land surface (ice-free and subglacial areas) to the surrounding coastal waters. Extrapolated to an area of 2.5x10 4 km 2 , this Fe A input is comparable to the contribution from icebergs and c. 240-fold higher than aeolian input via dust. An observed rise in local sediment accumulation rates suggests that glacial erosion has been increasing over recent decades and that (sub-)glacially derived SPM is becoming more important as a source of iron to the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Monien, Donata Monien, Patrick Brünjes, Robert Widmer, Tatjana Kappenberg, Arne Silva Busso, Adrian A. Schnetger, Bernhard Brumsack, Hans-Jürgen |
spellingShingle |
Monien, Donata Monien, Patrick Brünjes, Robert Widmer, Tatjana Kappenberg, Arne Silva Busso, Adrian A. Schnetger, Bernhard Brumsack, Hans-Jürgen Meltwater as a source of potentially bioavailable iron to Antarctica waters |
author_facet |
Monien, Donata Monien, Patrick Brünjes, Robert Widmer, Tatjana Kappenberg, Arne Silva Busso, Adrian A. Schnetger, Bernhard Brumsack, Hans-Jürgen |
author_sort |
Monien, Donata |
title |
Meltwater as a source of potentially bioavailable iron to Antarctica waters |
title_short |
Meltwater as a source of potentially bioavailable iron to Antarctica waters |
title_full |
Meltwater as a source of potentially bioavailable iron to Antarctica waters |
title_fullStr |
Meltwater as a source of potentially bioavailable iron to Antarctica waters |
title_full_unstemmed |
Meltwater as a source of potentially bioavailable iron to Antarctica waters |
title_sort |
meltwater as a source of potentially bioavailable iron to antarctica waters |
publisher |
Cambridge University Press (CUP) |
publishDate |
2017 |
url |
http://dx.doi.org/10.1017/s095410201600064x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410201600064X |
genre |
Antarc* Antarctic Antarctic Science Antarctica Bransfield Strait Iceberg* King George Island Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Science Antarctica Bransfield Strait Iceberg* King George Island Southern Ocean |
op_source |
Antarctic Science volume 29, issue 3, page 277-291 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s095410201600064x |
container_title |
Antarctic Science |
container_volume |
29 |
container_issue |
3 |
container_start_page |
277 |
op_container_end_page |
291 |
_version_ |
1810289275124580352 |