Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/250228
Share/Export:
logo share SHARE logo core CORE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Title

Linkages between greenhouse gases (CO2, CH4, and N2O) and dissolved organic matter composition in a shallow estuary

AuthorsAmaral, Valentina; Ortega, Teodora; Romera-Castillo, Cristina CSIC ORCID ; Forja, Jesús M.
KeywordsCarbon dioxide
Methane
Nitrous oxide
Fluorescent DOM
Estuaries
Issue DateSep-2021
PublisherElsevier
CitationScience of the Total Environment 788: 147863 (2021)
AbstractEstuarine systems receive large amounts of organic matter that enhance the production of greenhouse gases (GHGs), such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). Despite considerable research on GHGs and dissolved organic matter (DOM) distribution in estuaries, little is known about the linkage between these gases and DOM composition. Here we evaluated the relationship between three GHGs (CO2, CH4, and N2O) and DOM composition, determined through optical properties, in Guadalete estuary (Bay of Cadiz, Spain). The partial pressure of CO2, and CH4 and N2O concentrations ranged between 332.8 and 6807.1 μatm, 19.9–6440.1 nM, and 6.8–283.9 nM, respectively. Thus, the Guadalete estuary was a source of CO2, CH4 and N2O to the atmosphere. We validated three PARAFAC components related to humic-like fluorescence from terrestrial, microbial and effluent sources, and one with protein-like material. Humic-like components accounted for 86% ± 6% of the total FDOM pool, indicating a predominantly allochthonous DOM origin. The three GHGs were significantly linked to DOC concentration and DOM composition, exhibiting different patterns in these linkages. Terrestrial and microbial humic-like substances with increasing aromaticity might enhance pCO2 in Guadalete estuary. Dissolved CH4 concentrations showed the strongest relationship with DOM composition, indicating that humic and protein-like material are linked with their distribution. In contrast, dissolved N2O was only related with the protein-like fraction and with humic-like material derived from anthropogenic activities (sewage and agriculture). Our results further indicate that a possible coupling between benthic fluxes of GHGs and DOM might be occurring in this shallow estuary. We conclude that it is important to account for DOM composition when studying GHGs distribution in estuarine systems to understand their roles and potential responses associated with climate change
Description14 pages, 9 figures, 4 tables
Publisher version (URL)https://doi.org/10.1016/j.scitotenv.2021.147863
URIhttp://hdl.handle.net/10261/250228
DOI10.1016/j.scitotenv.2021.147863
ISSN0048-9697
E-ISSN1879-1026
Appears in Collections:(ICM) Artículos

Files in This Item:
File Description SizeFormat Existing users please Login
Amaral_et_al_2021_postprint.pdf1,81 MBAdobe PDFEmbargoed until September 30, 2023    Request a copy
Show full item record
Review this work

Google ScholarTM

Check

Altmetric

Dimensions


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.