Un nouveau gaz à effet de serre

Un nouveau gaz à effet de serre hautement résistant a été détecté dans l’atmosphère par des chercheurs de l’université de Toronto qui l’ont annoncé lundi 9 décembre. Le perfluorotributylamine (PFTBA) est un gaz artificiel, utilisé notamment dans la fabrication d’équipements électriques et électroniques. Selon les analyses des chercheurs des universitaires, le PFTBA a l’effet radiatif le plus puissant de tous les gaz que l’on retrouve dans l’atmosphère.


Le PFTBA n’a pas été répertorié jusqu’à présent dans la famille des gaz à effet de serre persistants, dont fait notamment partie le dioxyde de carbone (CO2), mais en comparaison, sur une période de cent ans, son impact sur le réchauffement climatique est de loin supérieur au CO2, avancent ces chercheurs.


Une seule molécule de PFTBA dans l’atmosphère a le même effet que 7 100 molécules de CO2, remarque notamment Cora Young, une chimiste de l’université de Toronto. De plus, ce gaz a une très longue durée de vie dans la basse atmosphère avant de se dissiper dans les couches les plus élevées et on ne connaît aucun agent capable de l’ élimier, affirment les cinq scientifiques responsables de cette étude.

D’après cette étude publiée dans la revue Geophysical Research Letters, le PFTBA s’inscrirait dans une nouvelle classe de gaz effet de serre persistants. Ils préconisent une étude plus approfondie pour établir leur impact réel sur le climat.

Source Le Monde - 2013

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