Upper ocean vertical supply: A neglected primary factor controlling the distribution of neodymium concentrations of open ocean surface waters?
Neodymium (Nd) isotopes are an important geochemical tool to trace the present and past water mass mixing as well as continental inputs. The distribution of Nd concentrations in open ocean surface waters (0–100 m) is generally assumed to be controlled by lateral mixing of Nd from coastal surface cur...
Published in: | Journal of Geophysical Research: Oceans |
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Language: | English |
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2013
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Online Access: | https://oceanrep.geomar.de/id/eprint/22208/ https://oceanrep.geomar.de/id/eprint/22208/1/Chen_et_al_JGR_2013.pdf https://doi.org/10.1002/jgrc.20288 |
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ftoceanrep:oai:oceanrep.geomar.de:22208 2023-05-15T18:25:42+02:00 Upper ocean vertical supply: A neglected primary factor controlling the distribution of neodymium concentrations of open ocean surface waters? Chen, Tian-Yu Rempfer, Johannes Frank, Martin Stumpf, Roland Molina-Kescher, Mario 2013-08-19 text https://oceanrep.geomar.de/id/eprint/22208/ https://oceanrep.geomar.de/id/eprint/22208/1/Chen_et_al_JGR_2013.pdf https://doi.org/10.1002/jgrc.20288 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/22208/1/Chen_et_al_JGR_2013.pdf Chen, T. Y., Rempfer, J., Frank, M. , Stumpf, R. and Molina-Kescher, M. (2013) Upper ocean vertical supply: A neglected primary factor controlling the distribution of neodymium concentrations of open ocean surface waters?. Open Access Journal of Geophysical Research: Oceans, 118 . pp. 3887-3894. DOI 10.1002/jgrc.20288 <https://doi.org/10.1002/jgrc.20288>. doi:10.1002/jgrc.20288 info:eu-repo/semantics/openAccess Article PeerReviewed 2013 ftoceanrep https://doi.org/10.1002/jgrc.20288 2023-04-07T15:10:30Z Neodymium (Nd) isotopes are an important geochemical tool to trace the present and past water mass mixing as well as continental inputs. The distribution of Nd concentrations in open ocean surface waters (0–100 m) is generally assumed to be controlled by lateral mixing of Nd from coastal surface currents and by removal through reversible particle scavenging. However, using 228Ra activity as an indicator of coastal water mass influence, surface water Nd concentration data available on key oceanic transects as a whole do not support the above scenario. From a global compilation of available data, we find that more stratified regions are generally associated with low surface Nd concentrations. This implies that upper ocean vertical supply may be an as yet neglected primary factor in determining the basin-scale variations of surface water Nd concentrations. Similar to the mechanism of nutrients supply, it is likely that stratification inhibits vertical supply of Nd from the subsurface thermocline waters and thus the magnitude of Nd flux to the surface layer. Consistently, the estimated required input flux of Nd to the surface layer to maintain the observed concentrations could be nearly two orders of magnitudes larger than riverine/dust flux, and also larger than the model-based estimation on shelf-derived coastal flux. In addition, preliminary results from modeling experiments reveal that the input from shallow boundary sources, riverine input, and release from dust are actually not the primary factors controlling Nd concentrations most notably in the Pacific and Southern Ocean surface waters. Article in Journal/Newspaper Southern Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Pacific Southern Ocean Journal of Geophysical Research: Oceans 118 8 3887 3894 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Neodymium (Nd) isotopes are an important geochemical tool to trace the present and past water mass mixing as well as continental inputs. The distribution of Nd concentrations in open ocean surface waters (0–100 m) is generally assumed to be controlled by lateral mixing of Nd from coastal surface currents and by removal through reversible particle scavenging. However, using 228Ra activity as an indicator of coastal water mass influence, surface water Nd concentration data available on key oceanic transects as a whole do not support the above scenario. From a global compilation of available data, we find that more stratified regions are generally associated with low surface Nd concentrations. This implies that upper ocean vertical supply may be an as yet neglected primary factor in determining the basin-scale variations of surface water Nd concentrations. Similar to the mechanism of nutrients supply, it is likely that stratification inhibits vertical supply of Nd from the subsurface thermocline waters and thus the magnitude of Nd flux to the surface layer. Consistently, the estimated required input flux of Nd to the surface layer to maintain the observed concentrations could be nearly two orders of magnitudes larger than riverine/dust flux, and also larger than the model-based estimation on shelf-derived coastal flux. In addition, preliminary results from modeling experiments reveal that the input from shallow boundary sources, riverine input, and release from dust are actually not the primary factors controlling Nd concentrations most notably in the Pacific and Southern Ocean surface waters. |
format |
Article in Journal/Newspaper |
author |
Chen, Tian-Yu Rempfer, Johannes Frank, Martin Stumpf, Roland Molina-Kescher, Mario |
spellingShingle |
Chen, Tian-Yu Rempfer, Johannes Frank, Martin Stumpf, Roland Molina-Kescher, Mario Upper ocean vertical supply: A neglected primary factor controlling the distribution of neodymium concentrations of open ocean surface waters? |
author_facet |
Chen, Tian-Yu Rempfer, Johannes Frank, Martin Stumpf, Roland Molina-Kescher, Mario |
author_sort |
Chen, Tian-Yu |
title |
Upper ocean vertical supply: A neglected primary factor controlling the distribution of neodymium concentrations of open ocean surface waters? |
title_short |
Upper ocean vertical supply: A neglected primary factor controlling the distribution of neodymium concentrations of open ocean surface waters? |
title_full |
Upper ocean vertical supply: A neglected primary factor controlling the distribution of neodymium concentrations of open ocean surface waters? |
title_fullStr |
Upper ocean vertical supply: A neglected primary factor controlling the distribution of neodymium concentrations of open ocean surface waters? |
title_full_unstemmed |
Upper ocean vertical supply: A neglected primary factor controlling the distribution of neodymium concentrations of open ocean surface waters? |
title_sort |
upper ocean vertical supply: a neglected primary factor controlling the distribution of neodymium concentrations of open ocean surface waters? |
publisher |
AGU (American Geophysical Union) |
publishDate |
2013 |
url |
https://oceanrep.geomar.de/id/eprint/22208/ https://oceanrep.geomar.de/id/eprint/22208/1/Chen_et_al_JGR_2013.pdf https://doi.org/10.1002/jgrc.20288 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/22208/1/Chen_et_al_JGR_2013.pdf Chen, T. Y., Rempfer, J., Frank, M. , Stumpf, R. and Molina-Kescher, M. (2013) Upper ocean vertical supply: A neglected primary factor controlling the distribution of neodymium concentrations of open ocean surface waters?. Open Access Journal of Geophysical Research: Oceans, 118 . pp. 3887-3894. DOI 10.1002/jgrc.20288 <https://doi.org/10.1002/jgrc.20288>. doi:10.1002/jgrc.20288 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/jgrc.20288 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
118 |
container_issue |
8 |
container_start_page |
3887 |
op_container_end_page |
3894 |
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1766207316968865792 |