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ARTICLE-Annex_I: Research and systematic observations [go to this ARTICLE]
... (iii) Methane (CH4)
- Methane has both natural and anthropogenic sources, and affects both tropospheric and stratospheric ozone.
... Methane has both natural and anthropogenic sources, and affects both tropospheric and stratospheric ozone. ...
... (iv) Non-methane hydrocarbon species
- Non-methane hydrocarbon species, which consist of a large number of chemical substances, have both natural and anthropogenic sources, and play a direct role in tropospheric photochemistry and an indirect role in stratospheric photochemistry.
... Non-methane hydrocarbon species, which consist of a large number of chemical substances, have both natural and anthropogenic sources, and play a direct role in tropospheric photochemistry and an indirect role in stratospheric photochemistry. ...
... Water, the source of which is natural, plays a vital role in both tropospheric and stratospheric photochemistry. Local sources of water vapor in the stratosphere include the oxidation of methane and, to a lesser extent, of hydrogen. ...