 |
| Titel |
Transpacific transport of ozone pollution and the effect of recent Asian emission increases on air quality in North America: an integrated analysis using satellite, aircraft, ozonesonde, and surface observations |
| VerfasserIn |
L. Zhang, D. J. Jacob, K. F. Boersma, D. A. Jaffe, J. R. Olson, K. W. Bowman, J. R. Worden, A. M. Thompson, M. A. Avery, R. C. Cohen, J. E. Dibb, F. M. Flock, H. E. Fuelberg, L. G. Huey, W. W. McMillan, H. B. Singh, A. J. Weinheimer |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 20 ; Nr. 8, no. 20 (2008-10-22), S.6117-6136 |
| Datensatznummer |
250006417
|
| Publikation (Nr.) |
 copernicus.org/acp-8-6117-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
| We use an ensemble of aircraft, satellite, sonde, and surface observations
for April–May 2006 (NASA/INTEX-B aircraft campaign) to better understand the
mechanisms for transpacific ozone pollution and its implications for North
American air quality. The observations are interpreted with a global 3-D
chemical transport model (GEOS-Chem). OMI NO2 satellite observations
constrain Asian anthropogenic NOx emissions and indicate a factor of 2
increase from 2000 to 2006 in China. Satellite observations of CO from AIRS
and TES indicate two major events of Asian transpacific pollution during
INTEX-B. Correlation between TES CO and ozone observations shows evidence
for transpacific ozone pollution. The semi-permanent Pacific High and
Aleutian Low cause splitting of transpacific pollution plumes over the
Northeast Pacific. The northern branch circulates around the Aleutian Low
and has little impact on North America. The southern branch circulates
around the Pacific High and some of that air impacts western North America.
Both aircraft measurements and model results show sustained ozone production
driven by peroxyacetylnitrate (PAN) decomposition in the southern branch,
roughly doubling the transpacific influence from ozone produced in the Asian
boundary layer. Model simulation of ozone observations at Mt. Bachelor Observatory in Oregon (2.7 km altitude) indicates a mean Asian ozone
pollution contribution of 9±3 ppbv to the mean observed concentration
of 54 ppbv, reflecting mostly an enhancement in background ozone rather than
episodic Asian plumes. Asian pollution enhanced surface ozone concentrations
by 5–7 ppbv over western North America in spring 2006. The 2000–2006 rise in
Asian anthropogenic emissions increased this influence by 1–2 ppbv. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|