Determination of methane emissions in three hydroelectric dams in Costa Rica

 

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Detalles Bibliográficos
Autores: Herrera, Jorge, Rojas, José F., Rodríguez, Susana, Rojas, Antonieta, Beita, Víctor H.
Formato: artículo original
Estado:Versión publicada
Fecha de Publicación:2013
Descripción:The emission fluxes of methane (CH4) across air–water interface were measured in three hydroelectric dams in Costa Rica (Brasil, Nuestro Amo and Cote Lake) during three years cycle (2009-2011), using the floating static chamber technique. Samples were taken during one week, both day and night time, through four campaigns per year. For the methane flux determination the water surface was divided in a 4x4 grid equally spaced. During this period, CH4 fluxes showed average values that ranged from 759 – 4282 (Brasil), 77 – 733 (Nuestro Amo) and 10,9 – 44,2 mg CH4 m-2 d-1 (Cote Lake), respectively. The fluxes of CH4 showed both strong seasonal and diurnal variations. CH4 emission rate was highest in dry season and there was a significant difference for CH4 emissions between day and night, the ratios between nighttime to daytime methane flux increased from 0,35 to 0,72, 0,43 to 0,64 for Brasil and Nuestro Amo, respectively in this season. CH4 emission was correlated positively with soil temperature, water table and chlorophyll a water concentrations.
País:Portal de Revistas UNA
Institución:Universidad Nacional de Costa Rica
Repositorio:Portal de Revistas UNA
Lenguaje:Español
OAI Identifier:oai:ojs.www.una.ac.cr:article/7217
Acceso en línea:https://www.revistas.una.ac.cr/index.php/ambientales/article/view/7217
Access Level:acceso abierto
Palabra clave:Flujos de metano
embalses hidroeléctricos
Costa Rica
Methane Fluxes
Hydroelectric dams