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External Data Spec

CH4 and N2O concentrations (dataset URL is not available)

External Data Spec Published 01 Jan 2002
information.png Provider:
Advanced Global Atmospheric Gases Experiment (AGAGE)
information.png Dataset URL:
http://agage.mit.edu/
information.png Dataset path:

The dataset URL is not available. For further clarification please contact the author or the organisation.

Related content

Used in indicators

Indicator Specification
Archived
Atmospheric greenhouse gas concentrations This indicator shows the observed trends in greenhouse gas concentrations. Greenhouse gases differ in the way they affect the climate system. In order to sum the effects of the individual greenhouse gases and other forcing agents in the atmosphere, the so-called 'greenhouse gas equivalent concentration' has been defined. This is the concentration of CO 2 that would cause the same amount of radiative forcing as a mixture of CO 2 and other forcing agents (greenhouse gases and aerosols). The forcing is expressed here in CO 2- equivalent concentrations, rather than watts per square meter (W/m 2 ), because they are more easily understood by the general public. For a more detailed assessment of radiative forcing expressed in W/m 2 , the reader should refer to IPCC (2013). Global average annual concentrations are presented here. Although greenhouse gases are mainly emitted in the northern hemisphere, the use of global average values is considered justified because the atmospheric lifetime of most greenhouse gases is long compared with the timescales of global atmospheric mixing. This leads to a rather uniform mixture around the globe. The exceptions are ozone and aerosols. However, as described earlier, these gases are less relevant in the long term.
Indicator Specification
Archived
Atmospheric greenhouse gas concentrations This indicator shows the observed trends in greenhouse gas concentrations. Greenhouse gases differ in the way they affect the climate system. In order to sum the effects of the individual greenhouse gasses and other forcing agents in the atmosphere, the so-called 'greenhouse gas equivalent concentration' has been defined. This is the concentration of CO 2 that would cause the same amount of radiative forcing as a mixture of CO 2 and other forcing agents (greenhouse gases and aerosols). The forcing is expressed here in CO 2- equivalent concentrations, rather than watts per square meter (W/m 2 ), because they are more easily understood by the general public. For a more detailed assessment of radiative forcing expressed in W/m 2 , the reader is referred to IPCC (2013). Global average annual concentrations are presented here. Although greenhouse gases are mainly emitted in the northern hemisphere, the use of global average values is considered justified, because the atmospheric lifetime of most greenhouse gases is long compared with the timescales of global atmospheric mixing. This leads to a rather uniform mixture around the globe. The exceptions are ozone and aerosols. However, as described earlier, these gases are less relevant in the long term.
Indicator Specification Atmospheric greenhouse gas concentrations This indicator shows the observed trends in greenhouse gas concentrations. Greenhouse gases differ in the way they affect the climate system. In order to sum the effects of the individual greenhouse gasses and other forcing agents in the atmosphere, the so-called ‘greenhouse gas equivalent concentration’ has been defined. This is the concentration of CO 2 that would cause the same amount of radiative forcing as a mixture of CO 2 and other forcing agents (greenhouse gases and aerosols). The forcing is expressed here in CO 2- equivalent concentrations, rather than watts per square meter (W/m 2 ), because they are more easily understood by the general public. For a more detailed assessment of radiative forcing expressed in W/m 2 , the reader is referred to IPCC (2013). Global average annual concentrations are presented here. Although greenhouse gases are mainly emitted in the northern hemisphere, the use of global average values is considered justified, because the atmospheric lifetime of most greenhouse gases is long compared to the timescales of global atmospheric mixing. This leads to a rather uniform mixture around the globe. The exceptions are ozone and aerosols. However, as described earlier, these gases are less relevant, over the long term.
Indicator Specification
Archived
Atmospheric greenhouse gas concentrations This indicator shows the observed trends in greenhouse gas concentrations. The various greenhouse gases have been grouped in three different ways: (1) the six Kyoto Protocol GHGs (CO 2 , CH 4 , N 2 O, HFCs, PFCs & SF 6 ) (2) long-living GHGs (Kyoto Protocol gases plus the Montreal Protocol gases CFCs, HCFCs & CH 3 CCl 3 ) (3) long-living GHGs and ozone, water vapour and aerosols Greenhouse gasses are grouped in two ways. I n addition to the concentration of individual GHGs, they are grouped using the CO 2 -equivalent concentration as a way to add the different gasses. The CO 2 -equivalent concentration of a gas is the CO 2 concentration that would cause the same amount of radiative forcing as the mixture of all GHGs. Global annual averages are considered, because in general the gases mix quite well in the atmosphere. 
Indicator Specification
Archived
Atmospheric greenhouse gas concentrations The indicator shows the observed trends of greenhouse gas concentrations. The various greenhouse gases have been grouped in three different ways: (1) the six Kyoto Protocol GHGs (CO 2 , CH 4 , N 2 O, HFCs, PFCs & SF 6 ) (2) long-living GHGs (Kyoto Protocol gases plus the Montreal Protocol gases CFCs, HCFCs & CH 3 CCl 3 ) (3) long-living GHGs and ozone, water vapour and aerosols Next to the concentration of individual GHGs, greenhouse gasses are grouped in two ways, using the CO 2 -equivalent concentration as a way to add the different gasses. The CO 2 -equivalent concentration of a gas is the CO 2 concentration that would cause the same amount of radiative forcing as the mixture of all GHGs. Global annual averages are considered, because in general the gases mix quite well in the atmosphere. 
Indicator Specification
Archived
Atmospheric greenhouse gas concentrations The indicator shows the observed trends of greenhouse gas concentrations. The various greenhouse gases have been grouped in three different ways (see 'Justification for Indicator Selection’ section above). Next to the concentration of individual GHGs, greenhouse gasses are grouped in two ways, using the CO 2 -equivalent concentration as a way to add the different gasses. The CO 2 -equivalent concentration of a gas is the CO 2 concentration that would cause the same amount of radiative forcing as the mixture of all GHGs. Global annual averages are considered, because in general the gases mix quite well in the atmosphere. 
Indicator Specification
Archived
Atmospheric greenhouse gas concentrations The indicator shows the observed trends of greenhouse gas concentrations. The various greenhouse gases have been grouped in three different ways (see rationale). Except for the concentration of individual GHGs, the effect on the enhanced greenhouse effect is presented as CO 2 -equivalent concentrations, which is the CO 2 concentration that would cause the same amount of radiative forcing as the mixture of all GHGs. Global annual averages are considered, because in general the gases mix quite well in the atmosphere.

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For references, please go to https://www.eea.europa.eu/data-and-maps/data/external/ch4-and-n2o-concentrations-dataset or scan the QR code.

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