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Linking optical and molecular signatures of dissolved organic matter in the Mediterranean Sea

Dissolved organic matter (DOM) plays a key role in global biogeochemical cycles and experiences changes in molecular composition as it undergoes processing. In the semi-closed basins of the oligotrophic Mediterranean Sea, these gradual molecular modifications can be observed in close proximity. In o...

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Autores principales: Martínez-Pérez, Alba María, Nieto-Cid, Mar, Osterholz, Helena, Catalá, Teresa S., Reche, Isabel, Dittmar, Thorsten, Álvarez-Salgado, Xosé Antón
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5469803/
https://www.ncbi.nlm.nih.gov/pubmed/28611434
http://dx.doi.org/10.1038/s41598-017-03735-4
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author Martínez-Pérez, Alba María
Nieto-Cid, Mar
Osterholz, Helena
Catalá, Teresa S.
Reche, Isabel
Dittmar, Thorsten
Álvarez-Salgado, Xosé Antón
author_facet Martínez-Pérez, Alba María
Nieto-Cid, Mar
Osterholz, Helena
Catalá, Teresa S.
Reche, Isabel
Dittmar, Thorsten
Álvarez-Salgado, Xosé Antón
author_sort Martínez-Pérez, Alba María
collection PubMed
description Dissolved organic matter (DOM) plays a key role in global biogeochemical cycles and experiences changes in molecular composition as it undergoes processing. In the semi-closed basins of the oligotrophic Mediterranean Sea, these gradual molecular modifications can be observed in close proximity. In order to extend the spatial resolution of information on DOM molecular composition available from ultrahigh resolution mass spectrometry in this area, we relate this data to optical (fluorescence and absorption spectroscopy) measurements. Covariance between molecular formulae signal intensities and carbon-specific fluorescence intensities was examined by means of Spearman’s rank correlations. Fifty two per cent of the assigned molecular formulae were associated with at least one optical parameter, accounting for 70% of the total mass spectrum signal intensity. Furthermore, we obtained significant multiple linear regressions between optical and intensity-weighted molecular indices. The resulting regression equations were used to estimate molecular parameters such as the double bond equivalent, degradation state and occurrence of unsaturated aliphatic compounds from optical measurements. The statistical linkages between DOM molecular and optical properties illustrate that the simple, rapid and cost-efficient optical spectroscopic measurements provide valuable proxy information on the molecular composition of open ocean marine DOM.
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spelling pubmed-54698032017-06-19 Linking optical and molecular signatures of dissolved organic matter in the Mediterranean Sea Martínez-Pérez, Alba María Nieto-Cid, Mar Osterholz, Helena Catalá, Teresa S. Reche, Isabel Dittmar, Thorsten Álvarez-Salgado, Xosé Antón Sci Rep Article Dissolved organic matter (DOM) plays a key role in global biogeochemical cycles and experiences changes in molecular composition as it undergoes processing. In the semi-closed basins of the oligotrophic Mediterranean Sea, these gradual molecular modifications can be observed in close proximity. In order to extend the spatial resolution of information on DOM molecular composition available from ultrahigh resolution mass spectrometry in this area, we relate this data to optical (fluorescence and absorption spectroscopy) measurements. Covariance between molecular formulae signal intensities and carbon-specific fluorescence intensities was examined by means of Spearman’s rank correlations. Fifty two per cent of the assigned molecular formulae were associated with at least one optical parameter, accounting for 70% of the total mass spectrum signal intensity. Furthermore, we obtained significant multiple linear regressions between optical and intensity-weighted molecular indices. The resulting regression equations were used to estimate molecular parameters such as the double bond equivalent, degradation state and occurrence of unsaturated aliphatic compounds from optical measurements. The statistical linkages between DOM molecular and optical properties illustrate that the simple, rapid and cost-efficient optical spectroscopic measurements provide valuable proxy information on the molecular composition of open ocean marine DOM. Nature Publishing Group UK 2017-06-13 /pmc/articles/PMC5469803/ /pubmed/28611434 http://dx.doi.org/10.1038/s41598-017-03735-4 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Martínez-Pérez, Alba María
Nieto-Cid, Mar
Osterholz, Helena
Catalá, Teresa S.
Reche, Isabel
Dittmar, Thorsten
Álvarez-Salgado, Xosé Antón
Linking optical and molecular signatures of dissolved organic matter in the Mediterranean Sea
title Linking optical and molecular signatures of dissolved organic matter in the Mediterranean Sea
title_full Linking optical and molecular signatures of dissolved organic matter in the Mediterranean Sea
title_fullStr Linking optical and molecular signatures of dissolved organic matter in the Mediterranean Sea
title_full_unstemmed Linking optical and molecular signatures of dissolved organic matter in the Mediterranean Sea
title_short Linking optical and molecular signatures of dissolved organic matter in the Mediterranean Sea
title_sort linking optical and molecular signatures of dissolved organic matter in the mediterranean sea
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5469803/
https://www.ncbi.nlm.nih.gov/pubmed/28611434
http://dx.doi.org/10.1038/s41598-017-03735-4
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