Spatial variability of nitrous oxide in the Minho and Lima estuaries (Portugal)

Célia Gonçalves; Maria José Brogueira

doi:10.3989/scimar.04637.26A

Autores/as

Célia Gonçalves Instituto Português do Mar e da Atmosfera, IPMA https://orcid.org/0000-0001-5524-1256
Maria José Brogueira Instituto Português do Mar e da Atmosfera, IPMA https://orcid.org/0000-0003-3692-4099

DOI:

https://doi.org/10.3989/scimar.04637.26A

Palabras clave:

N2O, gas de efecto invernadero, flujos, emisión, estuarios portugueses

Resumen

El óxido nitroso es un poderoso gas de efecto invernadero y los estuarios representan potenciales fuentes de este biogás a la atmósfera. En este trabajo se analizan los primeros datos de N₂O obtenidos en los estuarios de Miño y Lima, así como los procesos y factores ambientales que pueden regular su producción en estos sistemas. En septiembre de 2006, N₂O alcanzó en el tramo superior del Lima valores de hasta 20,0 nmol L^–1 y el río Lima fue, aparentemente, la principal fuente de biogás para el sistema. En el Miño N₂O alcanzó una concentración máxima de 14,4 nmol L^–1 y la nitrificación parece contribuir al aumento de N₂O. En el tramo superior del Miño las concentraciones relativamente altas del substrato de nitrificación NH₄⁺ y las correlaciones positivas encontradas entre el exceso de N₂O (ΔN₂O) y el consumo aparente de oxígeno (AOU) y NO₂^–, y las correlaciones negativas entre ΔN₂O, NH₄⁺ y pH pueden interpretarse como una producción in situ de N₂O debido a la nitrificación pelágica. El Análisis de Componentes Principales evidenció diferencias considerables entre la cabecera de los estuarios particularmente en términos de mayor concentración de N₂O en el Lima y NH₄⁺ en el Miño. Las aguas superficiales del Miño y del Lima presentaban sobresaturación de N₂O (101-227%) y las emisiones estimadas de N₂O fueron de 0,28 Mg de N₂O-N año^–1 y 0,96 Mg de N₂O-N año^–1, respectivamente, que representan una fracción reducida de las emisiones totales de N₂O procedentes de los estuarios europeos.

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