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| Titel |
Variability of springtime transpacific pollution transport during 2000–2006: the INTEX-B mission in the context of previous years |
| VerfasserIn |
G. G. Pfister, L. K. Emmons, D. P. Edwards, A. Arellano, G. Sachse, T. Campos |
| 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 ; 10, no. 3 ; Nr. 10, no. 3 (2010-02-05), S.1345-1359 |
| Datensatznummer |
250008047
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| Publikation (Nr.) |
 copernicus.org/acp-10-1345-2010.pdf |
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| Zusammenfassung |
We analyze the transport of pollution across the Pacific during the NASA
INTEX-B (Intercontinental Chemical Transport Experiment Part B) campaign in
spring 2006 and examine how this year compares to the time period for 2000
through 2006. In addition to aircraft measurements of carbon monoxide (CO)
collected during INTEX-B, we include in this study multi-year satellite
retrievals of CO from the Measurements of Pollution in the Troposphere
(MOPITT) instrument and simulations from the chemistry transport model
MOZART-4. Model tracers are used to examine the contributions of different
source regions and source types to pollution levels over the Pacific.
Additional modeling studies are performed to separate the impacts of
inter-annual variability in meteorology and dynamics from changes in source
strength.
Interannual variability in the tropospheric CO burden over the Pacific and
the US as estimated from the MOPITT data range up to 7% and a somewhat
smaller estimate (5%) is derived from the model. When keeping the
emissions in the model constant between years, the year-to-year changes are
reduced (2%), but show that in addition to changes in emissions,
variable meteorological conditions also impact transpacific pollution
transport. We estimate that about 1/3 of the variability in the tropospheric
CO loading over the contiguous US is explained by changes in emissions and
about 2/3 by changes in meteorology and transport. Biomass burning sources
are found to be a larger driver for inter-annual variability in the CO
loading compared to fossil and biofuel sources or photochemical CO
production even though their absolute contributions are smaller. Source
contribution analysis shows that the aircraft sampling during INTEX-B was
fairly representative of the larger scale region, but with a slight bias
towards higher influence from Asian contributions. |
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