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Impacts of anthropogenic and natural NOx sources over the U.S. on tropospheric chemistry

Identifieur interne : 001F03 ( Main/Exploration ); précédent : 001F02; suivant : 001F04

Impacts of anthropogenic and natural NOx sources over the U.S. on tropospheric chemistry

Auteurs : Renyi Zhang [États-Unis] ; Xuexi Tie [États-Unis] ; Donald W. Bond [États-Unis]

Source :

Proceedings of the National Academy of Sciences of the United States of America [ 0027-8424 ] ; 2003.

RBID : PMC:149861

Abstract

We evaluate the impact of anthropogenic and natural NO_x sources over the contiguous United States on tropospheric NO_x and O₃ levels by using a global 3D chemical transport model. The effects of major U.S. surface NO_x emission sources (including anthropogenic, biomass burning, and soil emissions) are compared with that of lightning-produced NO_x. Summer lightning is shown to play a dominant role in controlling NO_x and O₃ concentrations in the middle and upper troposphere, despite the fact that fossil-fuel burning represents the largest source of NO_x over the U.S. Furthermore, the effect of regional U.S. lightning is propagated through large areas of the Northern Hemisphere by atmospheric circulation. The results reveal that a thorough assessment of atmospheric NO_x emission sources and their impact is required to devise control strategies for regional and global air pollution.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC149861

DOI: 10.1073/pnas.252763799
PubMed: 12552100
PubMed Central: 149861

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en"><p>We evaluate the impact of anthropogenic and natural NO<sub>x</sub>
 sources over the contiguous United States on tropospheric NO<sub>x</sub>
 and O<sub>3</sub>
 levels by using a global 3D chemical transport model. The effects of major U.S. surface NO<sub>x</sub>
 emission sources (including anthropogenic, biomass burning, and soil emissions) are compared with that of lightning-produced NO<sub>x</sub>
. Summer lightning is shown to play a dominant role in controlling NO<sub>x</sub>
 and O<sub>3</sub>
 concentrations in the middle and upper troposphere, despite the fact that fossil-fuel burning represents the largest source of NO<sub>x</sub>
 over the U.S. Furthermore, the effect of regional U.S. lightning is propagated through large areas of the Northern Hemisphere by atmospheric circulation. The results reveal that a thorough assessment of atmospheric NO<sub>x</sub>
 emission sources and their impact is required to devise control strategies for regional and global air pollution.</p>
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Impacts of anthropogenic and natural NOx sources over the U.S. on tropospheric chemistry

Impacts of anthropogenic and natural NOx sources over the U.S. on tropospheric chemistry

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