Nonmethane hydrocarbons: Difference between revisions
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<div class="definition"><div class="short_definition">(Abbreviated NMHCs.) Collectively, all the [[hydrocarbons]] other than [[methane]].</div><br/> <div class="paragraph">Methane is fairly long-lived in the [[atmosphere]] and has a large and relatively constant [[mixing ratio]] in the [[troposphere]]. The other hydrocarbons have [[lifetimes]] factors of 30–30 000 times shorter than methane, thus showing much greater [[variability]], and tend to have more localized sources. Since such sources are often [[anthropogenic]] in nature, the total concentration of NMHCs is often used as a measure of the degree of [[pollution]] of an [[air mass]].</div><br/> </div> | <div class="definition"><div class="short_definition">(Abbreviated NMHCs.) Collectively, all the [[hydrocarbons]] other than [[methane]].</div><br/> <div class="paragraph">Methane is fairly long-lived in the [[atmosphere]] and has a large and relatively constant [[mixing ratio|mixing ratio]] in the [[troposphere]]. The other hydrocarbons have [[lifetimes]] factors of 30–30 000 times shorter than methane, thus showing much greater [[variability]], and tend to have more localized sources. Since such sources are often [[anthropogenic]] in nature, the total concentration of NMHCs is often used as a measure of the degree of [[pollution]] of an [[air mass]].</div><br/> </div> | ||
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Latest revision as of 16:30, 25 April 2012
nonmethane hydrocarbons
(Abbreviated NMHCs.) Collectively, all the hydrocarbons other than methane.
Methane is fairly long-lived in the atmosphere and has a large and relatively constant mixing ratio in the troposphere. The other hydrocarbons have lifetimes factors of 30–30 000 times shorter than methane, thus showing much greater variability, and tend to have more localized sources. Since such sources are often anthropogenic in nature, the total concentration of NMHCs is often used as a measure of the degree of pollution of an air mass.
