Sediment and pore water geochemistry of sediment cores, Potter Cove, King George Island, supplement to: Monien, Patrick; Lettmann, Karsten Alexander; Monien, Donata; Asendorf, Sanja; Wölfl, Anne-Cathrin; Lim, Chai Heng; Thal, Janis; Schnetger, Bernhard; Brumsack, Hans-Jürgen (2014): Redox conditions and trace metal cycling in coastal sediments from the maritime Antarctic. Geochimica et Cosmochimica Acta, 141, 26-44
Redox-sensitive trace metals (Mn, Fe, U, Mo, Re), nutrients and terminal metabolic products (NO3-, NH4+, PO43-, total alkalinity) were for the first time investigated in pore waters of Antarctic coastal sediments. The results of this study reveal a high spatial variability in redox conditions in sur...
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ftdatacite:10.1594/pangaea.832335 2023-05-15T13:47:47+02:00 Sediment and pore water geochemistry of sediment cores, Potter Cove, King George Island, supplement to: Monien, Patrick; Lettmann, Karsten Alexander; Monien, Donata; Asendorf, Sanja; Wölfl, Anne-Cathrin; Lim, Chai Heng; Thal, Janis; Schnetger, Bernhard; Brumsack, Hans-Jürgen (2014): Redox conditions and trace metal cycling in coastal sediments from the maritime Antarctic. Geochimica et Cosmochimica Acta, 141, 26-44 Monien, Patrick Lettmann, Karsten Alexander Monien, Donata Asendorf, Sanja Wölfl, Anne-Cathrin Lim, Chai Heng Thal, Janis Schnetger, Bernhard Brumsack, Hans-Jürgen 2014 application/zip https://dx.doi.org/10.1594/pangaea.832335 https://doi.pangaea.de/10.1594/PANGAEA.832335 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/j.gca.2014.06.003 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Impact of climate induced glacier melt on marine coastal systems, Antarctica IMCOAST/IMCONet Supplementary Collection of Datasets Collection article 2014 ftdatacite https://doi.org/10.1594/pangaea.832335 https://doi.org/10.1016/j.gca.2014.06.003 2022-02-08T11:44:26Z Redox-sensitive trace metals (Mn, Fe, U, Mo, Re), nutrients and terminal metabolic products (NO3-, NH4+, PO43-, total alkalinity) were for the first time investigated in pore waters of Antarctic coastal sediments. The results of this study reveal a high spatial variability in redox conditions in surface sediments from Potter Cove, King George Island, western Antarctic Peninsula. Particularly in the shallower areas of the bay the significant correlation between sulphate depletion and total alkalinity, the inorganic product of terminal metabolism, indicates sulphate reduction to be the major pathway of organic matter mineralisation. In contrast, dissimilatory metal oxide reduction seems to be prevailing in the newly ice-free areas and the deeper troughs, where concentrations of dissolved iron of up to 700 µM were found. We suggest that the increased accumulation of fine-grained material with high amounts of reducible metal oxides in combination with the reduced availability of metabolisable organic matter and enhanced physical and biological disturbance by bottom water currents, ice scouring and burrowing organisms favours metal oxide reduction over sulphate reduction in these areas. Based on modelled iron fluxes we calculate the contribution of the Antarctic shelf to the pool of potentially bioavailable iron (Feb) to be 6.9x10**3 to 790x10**3 t/yr. Consequently, these shelf sediments would provide an Feb flux of 0.35-39.5/mg/m**2/yr (median: 3.8 mg/m**2/yr) to the Southern Ocean. This contribution is in the same order of magnitude as the flux provided by icebergs and significantly higher than the input by aeolian dust. For this reason suboxic shelf sediments form a key source of iron for the high nutrient-low chlorophyll (HNLC) areas of the Southern Ocean. This source may become even more important in the future due to rising temperatures at the WAP accompanied by enhanced glacier retreat and the accumulation of melt water derived iron-rich material on the shelf. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Iceberg* King George Island Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic Antarctic Peninsula King George Island Potter Cove |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Impact of climate induced glacier melt on marine coastal systems, Antarctica IMCOAST/IMCONet |
spellingShingle |
Impact of climate induced glacier melt on marine coastal systems, Antarctica IMCOAST/IMCONet Monien, Patrick Lettmann, Karsten Alexander Monien, Donata Asendorf, Sanja Wölfl, Anne-Cathrin Lim, Chai Heng Thal, Janis Schnetger, Bernhard Brumsack, Hans-Jürgen Sediment and pore water geochemistry of sediment cores, Potter Cove, King George Island, supplement to: Monien, Patrick; Lettmann, Karsten Alexander; Monien, Donata; Asendorf, Sanja; Wölfl, Anne-Cathrin; Lim, Chai Heng; Thal, Janis; Schnetger, Bernhard; Brumsack, Hans-Jürgen (2014): Redox conditions and trace metal cycling in coastal sediments from the maritime Antarctic. Geochimica et Cosmochimica Acta, 141, 26-44 |
topic_facet |
Impact of climate induced glacier melt on marine coastal systems, Antarctica IMCOAST/IMCONet |
description |
Redox-sensitive trace metals (Mn, Fe, U, Mo, Re), nutrients and terminal metabolic products (NO3-, NH4+, PO43-, total alkalinity) were for the first time investigated in pore waters of Antarctic coastal sediments. The results of this study reveal a high spatial variability in redox conditions in surface sediments from Potter Cove, King George Island, western Antarctic Peninsula. Particularly in the shallower areas of the bay the significant correlation between sulphate depletion and total alkalinity, the inorganic product of terminal metabolism, indicates sulphate reduction to be the major pathway of organic matter mineralisation. In contrast, dissimilatory metal oxide reduction seems to be prevailing in the newly ice-free areas and the deeper troughs, where concentrations of dissolved iron of up to 700 µM were found. We suggest that the increased accumulation of fine-grained material with high amounts of reducible metal oxides in combination with the reduced availability of metabolisable organic matter and enhanced physical and biological disturbance by bottom water currents, ice scouring and burrowing organisms favours metal oxide reduction over sulphate reduction in these areas. Based on modelled iron fluxes we calculate the contribution of the Antarctic shelf to the pool of potentially bioavailable iron (Feb) to be 6.9x10**3 to 790x10**3 t/yr. Consequently, these shelf sediments would provide an Feb flux of 0.35-39.5/mg/m**2/yr (median: 3.8 mg/m**2/yr) to the Southern Ocean. This contribution is in the same order of magnitude as the flux provided by icebergs and significantly higher than the input by aeolian dust. For this reason suboxic shelf sediments form a key source of iron for the high nutrient-low chlorophyll (HNLC) areas of the Southern Ocean. This source may become even more important in the future due to rising temperatures at the WAP accompanied by enhanced glacier retreat and the accumulation of melt water derived iron-rich material on the shelf. |
format |
Article in Journal/Newspaper |
author |
Monien, Patrick Lettmann, Karsten Alexander Monien, Donata Asendorf, Sanja Wölfl, Anne-Cathrin Lim, Chai Heng Thal, Janis Schnetger, Bernhard Brumsack, Hans-Jürgen |
author_facet |
Monien, Patrick Lettmann, Karsten Alexander Monien, Donata Asendorf, Sanja Wölfl, Anne-Cathrin Lim, Chai Heng Thal, Janis Schnetger, Bernhard Brumsack, Hans-Jürgen |
author_sort |
Monien, Patrick |
title |
Sediment and pore water geochemistry of sediment cores, Potter Cove, King George Island, supplement to: Monien, Patrick; Lettmann, Karsten Alexander; Monien, Donata; Asendorf, Sanja; Wölfl, Anne-Cathrin; Lim, Chai Heng; Thal, Janis; Schnetger, Bernhard; Brumsack, Hans-Jürgen (2014): Redox conditions and trace metal cycling in coastal sediments from the maritime Antarctic. Geochimica et Cosmochimica Acta, 141, 26-44 |
title_short |
Sediment and pore water geochemistry of sediment cores, Potter Cove, King George Island, supplement to: Monien, Patrick; Lettmann, Karsten Alexander; Monien, Donata; Asendorf, Sanja; Wölfl, Anne-Cathrin; Lim, Chai Heng; Thal, Janis; Schnetger, Bernhard; Brumsack, Hans-Jürgen (2014): Redox conditions and trace metal cycling in coastal sediments from the maritime Antarctic. Geochimica et Cosmochimica Acta, 141, 26-44 |
title_full |
Sediment and pore water geochemistry of sediment cores, Potter Cove, King George Island, supplement to: Monien, Patrick; Lettmann, Karsten Alexander; Monien, Donata; Asendorf, Sanja; Wölfl, Anne-Cathrin; Lim, Chai Heng; Thal, Janis; Schnetger, Bernhard; Brumsack, Hans-Jürgen (2014): Redox conditions and trace metal cycling in coastal sediments from the maritime Antarctic. Geochimica et Cosmochimica Acta, 141, 26-44 |
title_fullStr |
Sediment and pore water geochemistry of sediment cores, Potter Cove, King George Island, supplement to: Monien, Patrick; Lettmann, Karsten Alexander; Monien, Donata; Asendorf, Sanja; Wölfl, Anne-Cathrin; Lim, Chai Heng; Thal, Janis; Schnetger, Bernhard; Brumsack, Hans-Jürgen (2014): Redox conditions and trace metal cycling in coastal sediments from the maritime Antarctic. Geochimica et Cosmochimica Acta, 141, 26-44 |
title_full_unstemmed |
Sediment and pore water geochemistry of sediment cores, Potter Cove, King George Island, supplement to: Monien, Patrick; Lettmann, Karsten Alexander; Monien, Donata; Asendorf, Sanja; Wölfl, Anne-Cathrin; Lim, Chai Heng; Thal, Janis; Schnetger, Bernhard; Brumsack, Hans-Jürgen (2014): Redox conditions and trace metal cycling in coastal sediments from the maritime Antarctic. Geochimica et Cosmochimica Acta, 141, 26-44 |
title_sort |
sediment and pore water geochemistry of sediment cores, potter cove, king george island, supplement to: monien, patrick; lettmann, karsten alexander; monien, donata; asendorf, sanja; wölfl, anne-cathrin; lim, chai heng; thal, janis; schnetger, bernhard; brumsack, hans-jürgen (2014): redox conditions and trace metal cycling in coastal sediments from the maritime antarctic. geochimica et cosmochimica acta, 141, 26-44 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2014 |
url |
https://dx.doi.org/10.1594/pangaea.832335 https://doi.pangaea.de/10.1594/PANGAEA.832335 |
geographic |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula King George Island Potter Cove |
geographic_facet |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula King George Island Potter Cove |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Iceberg* King George Island Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Iceberg* King George Island Southern Ocean |
op_relation |
https://dx.doi.org/10.1016/j.gca.2014.06.003 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.832335 https://doi.org/10.1016/j.gca.2014.06.003 |
_version_ |
1766247871033638912 |