Optical dignatures of dissolved organic matter transformation in the global ocean
© The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Frontiers in Marine Science 2 (2016): 118, doi:10.3389/fmars.2015.00118. Characterization of dissolved organic matter (DOM) in terms of its composit...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/8759 2023-05-15T15:15:21+02:00 Optical dignatures of dissolved organic matter transformation in the global ocean Nelson, Norman B. Gauglitz, Julia M. 2016-01-07 https://hdl.handle.net/1912/8759 en_US eng Frontiers Media https://doi.org/10.3389/fmars.2015.00118 Frontiers in Marine Science 2 (2016): 118 https://hdl.handle.net/1912/8759 doi:10.3389/fmars.2015.00118 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ CC-BY Frontiers in Marine Science 2 (2016): 118 doi:10.3389/fmars.2015.00118 CDOM FDOM Humic material Oceanic CDOM cycling Fluorescence analysis Article 2016 ftwhoas https://doi.org/10.3389/fmars.2015.00118 2022-05-28T22:59:50Z © The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Frontiers in Marine Science 2 (2016): 118, doi:10.3389/fmars.2015.00118. Characterization of dissolved organic matter (DOM) in terms of its composition and optical properties, with an eye toward ultimately understanding its deep ocean dynamics, is the currently active frontier in DOM research. We used UV-visible absorption spectroscopy and fluorescence excitation-emission matrix (EEM) spectroscopy to characterize DOM in the open ocean along sections of the U.S. CO2/CLIVAR Repeat Hydrography Project located in all the major ocean basins outside the Arctic. Despite large differences in fluorescence intensity between ocean basins, some variability patterns were similar throughout the global ocean, suggesting similar processes controlling the composition of the DOM. We find that commercially available single channel CDOM sensors are sensitive to the fluorescence of humic materials in the deep ocean and thermocline but not to the UVA-fluorescing and absorbing materials that characterize freshly produced CDOM in surface waters, revealing fundamental diversity in the DOM profile. In surface waters, UVA fluorescence and absorption signatures indicate the presence of freshly produced material and the process of bleaching removal, but in the upper mesopelagic and in the main thermocline these optical signatures are replaced by those of humic materials, with distribution patterns correlated to apparent oxygen utilization (AOU) and other signatures of remineralization. Empirical orthogonal function analysis (EOF) of the EEM data suggests the presence of two (unidentified) processes which convert “fresh” DOM to humic materials: one located in the surface ocean (shallower than 500 m) and one located in the main thermocline. These inferred humification processes represent less than 5% of the overall variability in oceanic humic DOM fluorescence, which appears to be dominated ... Article in Journal/Newspaper Arctic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Frontiers in Marine Science 2 |
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Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
CDOM FDOM Humic material Oceanic CDOM cycling Fluorescence analysis |
spellingShingle |
CDOM FDOM Humic material Oceanic CDOM cycling Fluorescence analysis Nelson, Norman B. Gauglitz, Julia M. Optical dignatures of dissolved organic matter transformation in the global ocean |
topic_facet |
CDOM FDOM Humic material Oceanic CDOM cycling Fluorescence analysis |
description |
© The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Frontiers in Marine Science 2 (2016): 118, doi:10.3389/fmars.2015.00118. Characterization of dissolved organic matter (DOM) in terms of its composition and optical properties, with an eye toward ultimately understanding its deep ocean dynamics, is the currently active frontier in DOM research. We used UV-visible absorption spectroscopy and fluorescence excitation-emission matrix (EEM) spectroscopy to characterize DOM in the open ocean along sections of the U.S. CO2/CLIVAR Repeat Hydrography Project located in all the major ocean basins outside the Arctic. Despite large differences in fluorescence intensity between ocean basins, some variability patterns were similar throughout the global ocean, suggesting similar processes controlling the composition of the DOM. We find that commercially available single channel CDOM sensors are sensitive to the fluorescence of humic materials in the deep ocean and thermocline but not to the UVA-fluorescing and absorbing materials that characterize freshly produced CDOM in surface waters, revealing fundamental diversity in the DOM profile. In surface waters, UVA fluorescence and absorption signatures indicate the presence of freshly produced material and the process of bleaching removal, but in the upper mesopelagic and in the main thermocline these optical signatures are replaced by those of humic materials, with distribution patterns correlated to apparent oxygen utilization (AOU) and other signatures of remineralization. Empirical orthogonal function analysis (EOF) of the EEM data suggests the presence of two (unidentified) processes which convert “fresh” DOM to humic materials: one located in the surface ocean (shallower than 500 m) and one located in the main thermocline. These inferred humification processes represent less than 5% of the overall variability in oceanic humic DOM fluorescence, which appears to be dominated ... |
format |
Article in Journal/Newspaper |
author |
Nelson, Norman B. Gauglitz, Julia M. |
author_facet |
Nelson, Norman B. Gauglitz, Julia M. |
author_sort |
Nelson, Norman B. |
title |
Optical dignatures of dissolved organic matter transformation in the global ocean |
title_short |
Optical dignatures of dissolved organic matter transformation in the global ocean |
title_full |
Optical dignatures of dissolved organic matter transformation in the global ocean |
title_fullStr |
Optical dignatures of dissolved organic matter transformation in the global ocean |
title_full_unstemmed |
Optical dignatures of dissolved organic matter transformation in the global ocean |
title_sort |
optical dignatures of dissolved organic matter transformation in the global ocean |
publisher |
Frontiers Media |
publishDate |
2016 |
url |
https://hdl.handle.net/1912/8759 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Frontiers in Marine Science 2 (2016): 118 doi:10.3389/fmars.2015.00118 |
op_relation |
https://doi.org/10.3389/fmars.2015.00118 Frontiers in Marine Science 2 (2016): 118 https://hdl.handle.net/1912/8759 doi:10.3389/fmars.2015.00118 |
op_rights |
Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2015.00118 |
container_title |
Frontiers in Marine Science |
container_volume |
2 |
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1766345719278469120 |