The spatial and temporal variability of Mn speciation in the coastal Northwest Atlantic Ocean
Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research-Oceans 125(1),(2020): e2019JC015167, doi:10.1029/2019JC015167....
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
American Geophysical Union
2019
|
Subjects: | |
Online Access: | https://hdl.handle.net/1912/25848 |
id |
ftwhoas:oai:darchive.mblwhoilibrary.org:1912/25848 |
---|---|
record_format |
openpolar |
spelling |
ftwhoas:oai:darchive.mblwhoilibrary.org:1912/25848 2023-05-15T17:45:35+02:00 The spatial and temporal variability of Mn speciation in the coastal Northwest Atlantic Ocean Oldham, Véronique E. Lamborg, Carl H. Hansel, Colleen M. 2019-12-20 https://hdl.handle.net/1912/25848 unknown American Geophysical Union https://doi.org/10.1029/2019JC015167 Oldham, V. E., Lamborg, C. H., & Hansel, C. M. (2020). The spatial and temporal variability of Mn speciation in the coastal Northwest Atlantic Ocean. Journal of Geophysical Research-Oceans, 125(1), e2019JC015167. https://hdl.handle.net/1912/25848 doi:10.1029/2019JC015167 Oldham, V. E., Lamborg, C. H., & Hansel, C. M. (2020). The spatial and temporal variability of Mn speciation in the coastal Northwest Atlantic Ocean. Journal of Geophysical Research-Oceans, 125(1), e2019JC015167. doi:10.1029/2019JC015167 Manganese Redox Trace Metal Diel Cycle Coastal Ocean Organic Complexation Article 2019 ftwhoas https://doi.org/10.1029/2019JC015167 2022-05-28T23:03:41Z Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research-Oceans 125(1),(2020): e2019JC015167, doi:10.1029/2019JC015167. Manganese (Mn) is distributed widely throughout the global ocean, where it cycles between three oxidation states that each play important biogeochemical roles. The speciation of Mn in seawater was previously operationally defined on filtration, with soluble Mn presumed to be Mn(II) and solid‐phase Mn as Mn(III/IV) oxides. Recent findings of abundant soluble Mn(III) complexes (Mn(III)‐L) highlights the need to reexamine the redox cycling of Mn, as these complexes can donate or accept electrons. To better understand the complex cycling of Mn in coastal waters, the distribution of Mn species at four Northwest Atlantic sites with different characteristics was examined. Diurnal influences on Mn speciation were investigated within a productive site. At all sites, Mn(III)‐L complexes dominated, particularly in surface waters, and Mn oxides were low in abundance in surface waters but high in bottom waters. Despite intrasite similarities, Mn speciation was highly variable between our stations, emphasizing the diverse processes that impact Mn redox. Diel Mn measurements revealed that the cycling of Mn is also highly variable over time, even on time scales as short as hours. We observed a change of over 100 nM total Mn over 17 hrs and find that speciation changed drastically. These changes could include contributions from biological, light‐mediated, and/or abiotic mechanisms but more likely point to the importance of lateral mixing at coastal sites. This exploration demonstrates the spatial and temporal variability of the Mn redox cycle and indicates that single timepoint vertical profiling is not sufficient when describing the geochemistry of dynamic coastal systems. This work was funded by grants from the Chemical ... Article in Journal/Newspaper Northwest Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Journal of Geophysical Research: Oceans 125 1 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
unknown |
topic |
Manganese Redox Trace Metal Diel Cycle Coastal Ocean Organic Complexation |
spellingShingle |
Manganese Redox Trace Metal Diel Cycle Coastal Ocean Organic Complexation Oldham, Véronique E. Lamborg, Carl H. Hansel, Colleen M. The spatial and temporal variability of Mn speciation in the coastal Northwest Atlantic Ocean |
topic_facet |
Manganese Redox Trace Metal Diel Cycle Coastal Ocean Organic Complexation |
description |
Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research-Oceans 125(1),(2020): e2019JC015167, doi:10.1029/2019JC015167. Manganese (Mn) is distributed widely throughout the global ocean, where it cycles between three oxidation states that each play important biogeochemical roles. The speciation of Mn in seawater was previously operationally defined on filtration, with soluble Mn presumed to be Mn(II) and solid‐phase Mn as Mn(III/IV) oxides. Recent findings of abundant soluble Mn(III) complexes (Mn(III)‐L) highlights the need to reexamine the redox cycling of Mn, as these complexes can donate or accept electrons. To better understand the complex cycling of Mn in coastal waters, the distribution of Mn species at four Northwest Atlantic sites with different characteristics was examined. Diurnal influences on Mn speciation were investigated within a productive site. At all sites, Mn(III)‐L complexes dominated, particularly in surface waters, and Mn oxides were low in abundance in surface waters but high in bottom waters. Despite intrasite similarities, Mn speciation was highly variable between our stations, emphasizing the diverse processes that impact Mn redox. Diel Mn measurements revealed that the cycling of Mn is also highly variable over time, even on time scales as short as hours. We observed a change of over 100 nM total Mn over 17 hrs and find that speciation changed drastically. These changes could include contributions from biological, light‐mediated, and/or abiotic mechanisms but more likely point to the importance of lateral mixing at coastal sites. This exploration demonstrates the spatial and temporal variability of the Mn redox cycle and indicates that single timepoint vertical profiling is not sufficient when describing the geochemistry of dynamic coastal systems. This work was funded by grants from the Chemical ... |
format |
Article in Journal/Newspaper |
author |
Oldham, Véronique E. Lamborg, Carl H. Hansel, Colleen M. |
author_facet |
Oldham, Véronique E. Lamborg, Carl H. Hansel, Colleen M. |
author_sort |
Oldham, Véronique E. |
title |
The spatial and temporal variability of Mn speciation in the coastal Northwest Atlantic Ocean |
title_short |
The spatial and temporal variability of Mn speciation in the coastal Northwest Atlantic Ocean |
title_full |
The spatial and temporal variability of Mn speciation in the coastal Northwest Atlantic Ocean |
title_fullStr |
The spatial and temporal variability of Mn speciation in the coastal Northwest Atlantic Ocean |
title_full_unstemmed |
The spatial and temporal variability of Mn speciation in the coastal Northwest Atlantic Ocean |
title_sort |
spatial and temporal variability of mn speciation in the coastal northwest atlantic ocean |
publisher |
American Geophysical Union |
publishDate |
2019 |
url |
https://hdl.handle.net/1912/25848 |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
Oldham, V. E., Lamborg, C. H., & Hansel, C. M. (2020). The spatial and temporal variability of Mn speciation in the coastal Northwest Atlantic Ocean. Journal of Geophysical Research-Oceans, 125(1), e2019JC015167. doi:10.1029/2019JC015167 |
op_relation |
https://doi.org/10.1029/2019JC015167 Oldham, V. E., Lamborg, C. H., & Hansel, C. M. (2020). The spatial and temporal variability of Mn speciation in the coastal Northwest Atlantic Ocean. Journal of Geophysical Research-Oceans, 125(1), e2019JC015167. https://hdl.handle.net/1912/25848 doi:10.1029/2019JC015167 |
op_doi |
https://doi.org/10.1029/2019JC015167 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
125 |
container_issue |
1 |
_version_ |
1766148714864312320 |