Particulate organic carbon sedimentation triggers lagged methane emissions in a eutrophic reservoir

Author:

Martínez‐García Andrés12ORCID,Peralta‐Maraver Ignacio12ORCID,Rodríguez‐Velasco Eva12ORCID,Batanero Gema L.1ORCID,García‐Alguacil Miriam12ORCID,Picazo Félix12ORCID,Calvo Juan23ORCID,Morales‐Baquero Rafael1ORCID,Rueda Francisco J.24ORCID,Reche Isabel12ORCID

Affiliation:

1. Departamento de Ecología and Instituto del Agua Universidad de Granada Granada Spain

2. Research Unit Modeling Nature (MNat) Universidad de Granada Granada Spain

3. Departmento de Matemática Aplicada Universidad de Granada Granada Spain

4. Departamento de Ingeniería Civil Universidad de Granada Granada Spain

Abstract

AbstractReservoirs act as carbon sinks when sedimentation of particulate organic carbon (POC) exceeds CO2 and CH4 emissions. Here, we study the poorly explored process where phytoplankton‐derived acidic polysaccharides (APs) aggregate into particulate organic matter, promoting carbon export to sediments. This source of POC in sediments can mineralize to CO2 and CH4 over various timescales. Our research, centered on a Mediterranean reservoir, elucidates phenological trends of APs and POC sedimentation and identifies their predominant drivers. Our findings present synchronic sedimentation patterns of POC and APs but identify a 2‐week delay between POC sedimentation and CH4 emissions. Despite its eutrophic status, our data demonstrate this reservoir's role as a carbon sink, sequestering 4.33 g C m−2 yr−1. This highlights the need to consider various time scales when quantifying carbon budgets in reservoirs.

Funder

Ministerio de Ciencia, Innovación y Universidades

Ministerio de Universidades

Consejería de Economía, Innovación, Ciencia y Empleo, Junta de Andalucía

Ministerio de Ciencia e Innovación

Publisher

Wiley

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