Trace element composition of suspended particulate matter along three meridional CLIVAR sections in the Indian and Southern Oceans: Impact of scavenging on Al distributions
We present the trace element composition (Al, Si, P, Ca, Fe, and Zn) of suspended particulate matter (SPM) samples collected in the upper 1000 m along U.S. CLIVAR/CO2 Repeat Hydrography meridional section I09N/I08S from the Southern Ocean to the Bay of Bengal at 95°E and in surface waters along m...
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ftsanjosestate:oai:scholarworks.sjsu.edu:faculty_rsca-5174 2024-05-19T07:31:09+00:00 Trace element composition of suspended particulate matter along three meridional CLIVAR sections in the Indian and Southern Oceans: Impact of scavenging on Al distributions Barrett, Pamela Resing, Joseph Grand, Maxime Measures, Christopher Landing, William 2018-06-01T07:00:00Z https://scholarworks.sjsu.edu/faculty_rsca/4175 https://doi.org/10.1016/j.chemgeo.2018.06.015 https://works.bepress.com/maxime-grand/3/download/ unknown SJSU ScholarWorks https://scholarworks.sjsu.edu/faculty_rsca/4175 doi:10.1016/j.chemgeo.2018.06.015 https://works.bepress.com/maxime-grand/3/download/ https://creativecommons.org/licenses/by-nc-nd/4.0/ Faculty Research, Scholarly, and Creative Activity Geochemistry Geology text 2018 ftsanjosestate https://doi.org/10.1016/j.chemgeo.2018.06.015 2024-04-30T23:54:45Z We present the trace element composition (Al, Si, P, Ca, Fe, and Zn) of suspended particulate matter (SPM) samples collected in the upper 1000 m along U.S. CLIVAR/CO2 Repeat Hydrography meridional section I09N/I08S from the Southern Ocean to the Bay of Bengal at 95°E and in surface waters along meridional section I06S from the South African margin to the Antarctic shelf edge at 30°E. A band of elevated surface-ocean pCa (0.5–0.3 μM) over 30–60°S is consistent with the global pattern of high coccolithophore production encircling the Southern Ocean suggested by remote sensing. Over 50–60°S, both sections exhibit a sharp transition from Ca-rich to Si-rich particulate matter (up to 2.8–6.5 μM), indicating a change from coccolithophore to diatom communities in waters with low residual nitrate. Along I08S, diatom blooms display elevated pZn concentrations and Zn:P ratios (14.9 + 5.7 mmol mol−1), reflecting cellular Zn stoichiometry of Southern Ocean diatoms. Regions of high primary productivity in the Southern Ocean are coincident with unexpectedly high surface-ocean pAl concentrations (max 12.6–26.5 nM) compared to background concentrations (typically <2 nM along I09N/I08S and <5 nM along I06S). We estimate that >50% of surface-ocean pAl in these regions originates from adsorptive scavenging of dissolved Al onto biogenic particles. Along I08S, dissolved Al reservoirs likely originate from transport of Al-enriched waters by the Agulhas Return Current, local dust deposition, and seasonal ice melt. Along I06S, pAl distributions suggest larger inputs of dust to the surface mixed layer than have previously been described. By contrast, pFe concentrations remain low in both surface (<0.3 nM I09N/I08S, 0.1–0.8 nM I06S) and intermediate (<0.4 nM I09N/I08S) waters away from coastal and shelf inputs. Inputs of lithogenic material from resuspended shelf sediments are apparent in the distributions of pFe and pAl close to the Antarctic margin (up to 10 nM pFe and ... Text Antarc* Antarctic Southern Ocean San José State University: SJSU ScholarWorks Chemical Geology 502 15 28 |
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San José State University: SJSU ScholarWorks |
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Geochemistry Geology |
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Geochemistry Geology Barrett, Pamela Resing, Joseph Grand, Maxime Measures, Christopher Landing, William Trace element composition of suspended particulate matter along three meridional CLIVAR sections in the Indian and Southern Oceans: Impact of scavenging on Al distributions |
topic_facet |
Geochemistry Geology |
description |
We present the trace element composition (Al, Si, P, Ca, Fe, and Zn) of suspended particulate matter (SPM) samples collected in the upper 1000 m along U.S. CLIVAR/CO2 Repeat Hydrography meridional section I09N/I08S from the Southern Ocean to the Bay of Bengal at 95°E and in surface waters along meridional section I06S from the South African margin to the Antarctic shelf edge at 30°E. A band of elevated surface-ocean pCa (0.5–0.3 μM) over 30–60°S is consistent with the global pattern of high coccolithophore production encircling the Southern Ocean suggested by remote sensing. Over 50–60°S, both sections exhibit a sharp transition from Ca-rich to Si-rich particulate matter (up to 2.8–6.5 μM), indicating a change from coccolithophore to diatom communities in waters with low residual nitrate. Along I08S, diatom blooms display elevated pZn concentrations and Zn:P ratios (14.9 + 5.7 mmol mol−1), reflecting cellular Zn stoichiometry of Southern Ocean diatoms. Regions of high primary productivity in the Southern Ocean are coincident with unexpectedly high surface-ocean pAl concentrations (max 12.6–26.5 nM) compared to background concentrations (typically <2 nM along I09N/I08S and <5 nM along I06S). We estimate that >50% of surface-ocean pAl in these regions originates from adsorptive scavenging of dissolved Al onto biogenic particles. Along I08S, dissolved Al reservoirs likely originate from transport of Al-enriched waters by the Agulhas Return Current, local dust deposition, and seasonal ice melt. Along I06S, pAl distributions suggest larger inputs of dust to the surface mixed layer than have previously been described. By contrast, pFe concentrations remain low in both surface (<0.3 nM I09N/I08S, 0.1–0.8 nM I06S) and intermediate (<0.4 nM I09N/I08S) waters away from coastal and shelf inputs. Inputs of lithogenic material from resuspended shelf sediments are apparent in the distributions of pFe and pAl close to the Antarctic margin (up to 10 nM pFe and ... |
format |
Text |
author |
Barrett, Pamela Resing, Joseph Grand, Maxime Measures, Christopher Landing, William |
author_facet |
Barrett, Pamela Resing, Joseph Grand, Maxime Measures, Christopher Landing, William |
author_sort |
Barrett, Pamela |
title |
Trace element composition of suspended particulate matter along three meridional CLIVAR sections in the Indian and Southern Oceans: Impact of scavenging on Al distributions |
title_short |
Trace element composition of suspended particulate matter along three meridional CLIVAR sections in the Indian and Southern Oceans: Impact of scavenging on Al distributions |
title_full |
Trace element composition of suspended particulate matter along three meridional CLIVAR sections in the Indian and Southern Oceans: Impact of scavenging on Al distributions |
title_fullStr |
Trace element composition of suspended particulate matter along three meridional CLIVAR sections in the Indian and Southern Oceans: Impact of scavenging on Al distributions |
title_full_unstemmed |
Trace element composition of suspended particulate matter along three meridional CLIVAR sections in the Indian and Southern Oceans: Impact of scavenging on Al distributions |
title_sort |
trace element composition of suspended particulate matter along three meridional clivar sections in the indian and southern oceans: impact of scavenging on al distributions |
publisher |
SJSU ScholarWorks |
publishDate |
2018 |
url |
https://scholarworks.sjsu.edu/faculty_rsca/4175 https://doi.org/10.1016/j.chemgeo.2018.06.015 https://works.bepress.com/maxime-grand/3/download/ |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Faculty Research, Scholarly, and Creative Activity |
op_relation |
https://scholarworks.sjsu.edu/faculty_rsca/4175 doi:10.1016/j.chemgeo.2018.06.015 https://works.bepress.com/maxime-grand/3/download/ |
op_rights |
https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1016/j.chemgeo.2018.06.015 |
container_title |
Chemical Geology |
container_volume |
502 |
container_start_page |
15 |
op_container_end_page |
28 |
_version_ |
1799469007471902720 |