Indicator: A-38 Greenhouse - methane concentrations and growth rates

Data

Cape Grim air archive and monthly averaged atmospheric methane (CH4) data in units of parts per billion (ppb)

Cape Grim air archive and monthly averaged atmospheric methane (CH<sub>4</sub>) data in units of parts per billion (ppb)

Source: CSIRO Atmospheric Research and Cape Grim Baseline Air Pollution Station/Australian Bureau of Meteorology

What the data mean

The data shows a steady increase in methane concentrations over the reporting period, 1984 to 2004. The annual growth varies from zero to eighteen parts per billion per annum.

Data Limitations

Nil known

Issues for which this is an indicator and why

Atmosphere — Climate variability and change - Greenhouse 

Atmospheric constituents such as carbon dioxide, methane and nitrous oxide contribute to a natural greenhouse effect and, with clouds, maintain the earth’s energy balance. The earth’s energy balance can change through increasing concentrations of these constituents in the atmosphere, as a result of human activities and natural events. Atmospheric concentrations of methane and growth rates are a direct indicator for this issue.

Other indicators for this issue:

Further Information

Source: Keppler F, Hamilton JTG, Brar M and Rockmann T 2006, Methane emissions from terrestrial plants under aerobic conditions.