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File:AIRS Methane.png

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English: AIRS 2011 annual mean upper troposphere(359Hpa) methane mixing ratio. Data source:http://daac.gsfc.nasa.gov/giovanni/.
The volume mixing ratio is the ratio of the number density of the gas to the total number density of the atmosphere (density is the number of molecules per unit volume) (source disc.sci.gsfc.nasa.gov, Goddard Space Flight Center)
Français : AIRS 2011 Taux (moyenne annuelle) de méthane dans la haute troposphère (à une pression moyenne de 359Hpa) ; source:http://daac.gsfc.nasa.gov/giovanni/
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Author Giorgiogp2

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