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stratospheric photochemistry [Global Index]
ARTICLE-Annex_I: Research and systematic observations [go to this ARTICLE]
... Carbon monoxide has significant natural and anthropogenic sources, and is thought to play a major 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. ...
... Hydrogen, the source of which is natural and anthropogenic, plays a minor 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. ...