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| Titel |
Will the role of intercontinental transport change in a changing climate? |
| VerfasserIn |
T. Glotfelty, Y. Zhang, P. Karamchandani, D. G. Streets |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 17 ; Nr. 14, no. 17 (2014-09-10), S.9379-9402 |
| Datensatznummer |
250119019
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| Publikation (Nr.) |
 copernicus.org/acp-14-9379-2014.pdf |
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| Zusammenfassung |
| Intercontinental transport of atmospheric pollution (ITAP) can offset the
impact of local emission control efforts, impact human and ecosystem health,
and play a role in climate forcing. This study aims to determine the role of
ITAP caused by East Asian anthropogenic emissions (EAAEs) under current and
future emission and climate scenarios. The contribution from EAAEs is
determined using a "brute force method" in which results from simulations with
and without EAAEs are compared. ITAP from East Asia is enhanced in the
future due to faster wind speeds aloft and a stronger low pressure center
near eastern Russia that facilitate enhanced westerly export in the free
troposphere and stronger southerly transport near the surface, increased
gaseous precursor emissions, and increased temperatures. As a result, the
contribution of ozone (O3) generated by EAAEs to the global average
O3 mixing ratio increases by ~0.8 ppb from 1.2 ppb in
2001 to 2.0 ppb in 2050. The contribution of PM2.5 generated by EAAEs
to the global PM2.5 level increases by ~0.07 μg m−3
from 0.32 μg m−3 in 2001 to 0.39 μg m−3 in
2050, despite a non-homogenous response in PM2.5 resulting from cloud
and radiative feedbacks. EAAEs can increase East Asian biogenic secondary
organic aerosol by 10–81%, indicating that it is largely controllable.
EAAEs also increase the deposition of nitrogen, black carbon, and mercury
both locally and downwind, implying that they may play a role in climate
feedbacks and ecosystem health of these regions. These results show that
EAAEs have a large impact on global air quality and climate, especially on
downwind regions. Such impacts may be enhanced under future climate and
emission scenarios, demonstrating a need to synergize global pollution
control and climate mitigation efforts. |
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