Dissolved Fe and Al in the upper 1000 m of the eastern Indian Ocean: A high‐resolution transect along 95°E from the Antarctic margin to the Bay of Bengal
A high‐resolution section of dissolved iron (dFe) and aluminum (dAl) was obtained along ~95°E in the upper 1000 m of the eastern Indian Ocean from the Antarctic margin (66°S) to the Bay of Bengal (18°N) during the U.S. Climate Variability and Predictability (CLIVAR) CO2 Repeat Hydrography I08S and I...
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2015
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Online Access: | https://scholarworks.sjsu.edu/marine_lab_pub/5 https://doi.org/10.1002/2014GB004920 https://scholarworks.sjsu.edu/context/marine_lab_pub/article/1004/viewcontent/Grand_DissolvedFe_AGU2015_stamped.pdf |
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ftsanjosestate:oai:scholarworks.sjsu.edu:marine_lab_pub-1004 2023-09-05T13:13:31+02:00 Dissolved Fe and Al in the upper 1000 m of the eastern Indian Ocean: A high‐resolution transect along 95°E from the Antarctic margin to the Bay of Bengal Grand, Maxime Measures, Christopher Hatta, Mariko Hiscock, William Landing, William Morton, Peter Buck, Clifton Barrett, Pamela Resing, Joseph 2015-03-01T08:00:00Z application/pdf https://scholarworks.sjsu.edu/marine_lab_pub/5 https://doi.org/10.1002/2014GB004920 https://scholarworks.sjsu.edu/context/marine_lab_pub/article/1004/viewcontent/Grand_DissolvedFe_AGU2015_stamped.pdf unknown SJSU ScholarWorks https://scholarworks.sjsu.edu/marine_lab_pub/5 doi:10.1002/2014GB004920 https://scholarworks.sjsu.edu/context/marine_lab_pub/article/1004/viewcontent/Grand_DissolvedFe_AGU2015_stamped.pdf Faculty Publications Climate Geology Oceanography text 2015 ftsanjosestate https://doi.org/10.1002/2014GB004920 2023-08-21T18:08:37Z A high‐resolution section of dissolved iron (dFe) and aluminum (dAl) was obtained along ~95°E in the upper 1000 m of the eastern Indian Ocean from the Antarctic margin (66°S) to the Bay of Bengal (18°N) during the U.S. Climate Variability and Predictability (CLIVAR) CO2 Repeat Hydrography I08S and I09N sections (February–April 2007). In the Southern Ocean, low concentrations of dAl (<1 n M) reflect the negligible dust inputs impacting the water masses subducted in the circumpolar domain. The low dAl concentrations characterizing the Southern Ocean terminate near 45°S, probably because of the advection of subtropical water masses that received dust and sedimentary inputs in their formation region. Our subsurface dFe data near the southern Kerguelen Plateau were significantly higher than historical observations in other Indian sectors of the Southern Ocean. We surmise that the offshore advection of dFe‐rich waters along the western flank of the southern Kerguelen plateau and enhanced vertical mixing could contribute to this elevated subsurface dFe inventory. Elevated subsurface particulate and dFe levels downstream of the northern Kerguelen Plateau may reflect long‐range lateral transport from the plateau's sediments and/or remineralization inputs. At the northern edge of the south Indian subtropical gyre, the deposition of Australian dust, possibly combined with the advection of dAl‐enriched waters from the Indonesian Throughflow, creates a region of elevated dAl in the upper 400 m but without a corresponding enrichment in dFe. In the northern Indian Ocean, the South Equatorial Current constitutes a remarkable biogeochemical front separating the oxygen‐rich and dFe‐poor subtropical gyre waters from the dFe‐rich and oxygen‐depleted waters of the northern Indian Ocean. By tracing the accumulation of macronutrients and dFe along the advective pathway of Indian Central Water, we show that the central waters of the northern Indian Ocean receive excess dFe in addition to that produced by remineralization inputs. The ... Text Antarc* Antarctic Southern Ocean San José State University: SJSU ScholarWorks Antarctic Indian Kerguelen Southern Ocean The Antarctic Global Biogeochemical Cycles 29 3 375 396 |
institution |
Open Polar |
collection |
San José State University: SJSU ScholarWorks |
op_collection_id |
ftsanjosestate |
language |
unknown |
topic |
Climate Geology Oceanography |
spellingShingle |
Climate Geology Oceanography Grand, Maxime Measures, Christopher Hatta, Mariko Hiscock, William Landing, William Morton, Peter Buck, Clifton Barrett, Pamela Resing, Joseph Dissolved Fe and Al in the upper 1000 m of the eastern Indian Ocean: A high‐resolution transect along 95°E from the Antarctic margin to the Bay of Bengal |
topic_facet |
Climate Geology Oceanography |
description |
A high‐resolution section of dissolved iron (dFe) and aluminum (dAl) was obtained along ~95°E in the upper 1000 m of the eastern Indian Ocean from the Antarctic margin (66°S) to the Bay of Bengal (18°N) during the U.S. Climate Variability and Predictability (CLIVAR) CO2 Repeat Hydrography I08S and I09N sections (February–April 2007). In the Southern Ocean, low concentrations of dAl (<1 n M) reflect the negligible dust inputs impacting the water masses subducted in the circumpolar domain. The low dAl concentrations characterizing the Southern Ocean terminate near 45°S, probably because of the advection of subtropical water masses that received dust and sedimentary inputs in their formation region. Our subsurface dFe data near the southern Kerguelen Plateau were significantly higher than historical observations in other Indian sectors of the Southern Ocean. We surmise that the offshore advection of dFe‐rich waters along the western flank of the southern Kerguelen plateau and enhanced vertical mixing could contribute to this elevated subsurface dFe inventory. Elevated subsurface particulate and dFe levels downstream of the northern Kerguelen Plateau may reflect long‐range lateral transport from the plateau's sediments and/or remineralization inputs. At the northern edge of the south Indian subtropical gyre, the deposition of Australian dust, possibly combined with the advection of dAl‐enriched waters from the Indonesian Throughflow, creates a region of elevated dAl in the upper 400 m but without a corresponding enrichment in dFe. In the northern Indian Ocean, the South Equatorial Current constitutes a remarkable biogeochemical front separating the oxygen‐rich and dFe‐poor subtropical gyre waters from the dFe‐rich and oxygen‐depleted waters of the northern Indian Ocean. By tracing the accumulation of macronutrients and dFe along the advective pathway of Indian Central Water, we show that the central waters of the northern Indian Ocean receive excess dFe in addition to that produced by remineralization inputs. The ... |
format |
Text |
author |
Grand, Maxime Measures, Christopher Hatta, Mariko Hiscock, William Landing, William Morton, Peter Buck, Clifton Barrett, Pamela Resing, Joseph |
author_facet |
Grand, Maxime Measures, Christopher Hatta, Mariko Hiscock, William Landing, William Morton, Peter Buck, Clifton Barrett, Pamela Resing, Joseph |
author_sort |
Grand, Maxime |
title |
Dissolved Fe and Al in the upper 1000 m of the eastern Indian Ocean: A high‐resolution transect along 95°E from the Antarctic margin to the Bay of Bengal |
title_short |
Dissolved Fe and Al in the upper 1000 m of the eastern Indian Ocean: A high‐resolution transect along 95°E from the Antarctic margin to the Bay of Bengal |
title_full |
Dissolved Fe and Al in the upper 1000 m of the eastern Indian Ocean: A high‐resolution transect along 95°E from the Antarctic margin to the Bay of Bengal |
title_fullStr |
Dissolved Fe and Al in the upper 1000 m of the eastern Indian Ocean: A high‐resolution transect along 95°E from the Antarctic margin to the Bay of Bengal |
title_full_unstemmed |
Dissolved Fe and Al in the upper 1000 m of the eastern Indian Ocean: A high‐resolution transect along 95°E from the Antarctic margin to the Bay of Bengal |
title_sort |
dissolved fe and al in the upper 1000 m of the eastern indian ocean: a high‐resolution transect along 95°e from the antarctic margin to the bay of bengal |
publisher |
SJSU ScholarWorks |
publishDate |
2015 |
url |
https://scholarworks.sjsu.edu/marine_lab_pub/5 https://doi.org/10.1002/2014GB004920 https://scholarworks.sjsu.edu/context/marine_lab_pub/article/1004/viewcontent/Grand_DissolvedFe_AGU2015_stamped.pdf |
geographic |
Antarctic Indian Kerguelen Southern Ocean The Antarctic |
geographic_facet |
Antarctic Indian Kerguelen Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Faculty Publications |
op_relation |
https://scholarworks.sjsu.edu/marine_lab_pub/5 doi:10.1002/2014GB004920 https://scholarworks.sjsu.edu/context/marine_lab_pub/article/1004/viewcontent/Grand_DissolvedFe_AGU2015_stamped.pdf |
op_doi |
https://doi.org/10.1002/2014GB004920 |
container_title |
Global Biogeochemical Cycles |
container_volume |
29 |
container_issue |
3 |
container_start_page |
375 |
op_container_end_page |
396 |
_version_ |
1776204760950505472 |