CO2 Now

Methane | CH4
Data for Atmospheric Methane (CH4) PDF Print E-mail


Instrument record for methane (CH4) from the Mauna Loa Observatory:

NOAA Publication of July 15, 2008:

NOAA  |  Greenhouse gases continue to climb despite economic slump  |  Apr 2009


Methane & Climate Science PDF Print E-mail


by Joe Melton, MSc 

Methane (CH4) is the most abundant organic molecule in the Earth’s atmosphere and plays important roles in both the planet’s radiative energy budget and global atmospheric chemistry (Brasseur et al., 1999). It’s presence in the atmosphere was first noted in 1948 from features in the infrared absorption spectrum [Migeotte, 1948] and it is now routinely measured. CH4 is the third most important greenhouse gas after H2O vapor and carbon dioxide (CO2) and has a Global Warming Potential (GWP) 25 times that of CO2 on a 100 –year timescale (Forster et al., 2007).