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Link between greenhouse gases (CO2, CH4, and N2O) and dissolved organic matter in Guadalete Estuary (Bay of Cádiz, Spain)

AuthorsAmaral, Valentina; Romera-Castillo, Cristina CSIC ORCID ; Ortega, Teodora; Forja, Jesús M.
KeywordsDissolved organic matter
Greenhouse gases
Issue DateJul-2020
CitationAbstracts Volume XX Seminario Ibérico de Química Marina: 62 (2020)
AbstractCoastal zones receive large amounts of organic matter that enhanced the production of greenhouse gases (GHG), such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). CO2 is produced by both aerobic and anaerobic degradation of organic matter, while CH4 and N2O are mainly produced in anaerobic conditions. However, recent studies showed “oxic” production of CH4 related to bacterial degradation of dissolved organic matter (DOM) (Repeta et al., 2016, Donis et al., 2016). This study aimed to assess the distribution of DOM and CH4, N2O, and CO2 in Guadalete estuary (Bay of Cadiz, Spain) and determine the relationship between different fractions of DOM with the production of GHG. We measured DOM, using its optical properties, and GHG using gas chromatography (CH4, N2O) or from total alkalinity and pH (CO2) during four cruises. Excitation-emission matrixes were used to identify the different fractions of DOM (e.g., humic-like and protein-like). The concentration of CO2, CH4 and, N2O ranged between 332.8-4275.6 μatm, 20.8- 6440.1 nM, and 8.8- 283.9 nM, respectively. The system was oversaturated with GHG. Thus, acting as a source of GHG to the atmosphere. DOM increased upstream, indicating that allochthonous origin predominates. We found strong linear relationships between the excess of the GHG (ΔCO2, ΔCH4, ΔN2O) and the main groups of DOM. ΔCH4 and ΔN2O showed a positive relationship with the protein fraction (R2 > 0.62, p > 0.05) while ΔCO2 was related to the terrestrial humic fraction of DOM (R2 = 0.52, p > 0.05). Our results indicated that the production of GHG in this estuary was also related to the degradation of DOM
DescriptionXX Seminario Ibérico de Química Marina (SIQUIMAR 2020) - XX Iberian Seminar on Marine Chemistry, 1-3 July 2020, Barcelona.-- 1 page
Publisher version (URL)https://isms.cat/wp-content/uploads/2020/09/libro-SIQUIMAR-ISMS-2020.pdf
Appears in Collections:(ICM) Comunicaciones congresos
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