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| Titel |
Free-troposphere ozone and carbon monoxide over the North Atlantic for 2001–2011 |
| VerfasserIn |
A. Kumar, S. Wu, M. F. Weise, R. Honrath, R. C. Owen, D. Helmig, L. Kramer, M. Val Martin, Q. Li |
| 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 ; 13, no. 24 ; Nr. 13, no. 24 (2013-12-20), S.12537-12547 |
| Datensatznummer |
250085901
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| Publikation (Nr.) |
 copernicus.org/acp-13-12537-2013.pdf |
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| Zusammenfassung |
| In situ measurements of carbon monoxide (CO) and ozone (O3) at the Pico
Mountain Observatory (PMO) located in the Azores, Portugal, are analyzed
together with results from an atmospheric chemical transport model
(GEOS-Chem) and satellite remote sensing data (AIRS (Atmospheric Infrared Sounder)
for CO, and TES (Tropospheric Emission Spectrometer) for
O3) to examine the evolution of free-troposphere CO and O3 over the
North Atlantic for 2001–2011. GEOS-Chem captured the seasonal cycles for CO
and O3 well but significantly underestimated the mixing ratios of CO,
particularly in spring. Statistically significant (using a significance level
of 0.05) decreasing trends were found for both CO and O3 based on
harmonic regression analysis of the measurement data. The best estimates of
the possible trends for CO and O3 measurements are −0.31 ± 0.30
(2-σ) ppbv yr−1 and −0.21 ± 0.11
(2-σ) ppbv yr−1, respectively. Similar decreasing trends for
both species were obtained with GEOS-Chem simulation results. The most
important factor contributing to the decreases in CO and O3 at PMO over
the past decade is the decline in anthropogenic emissions from North America,
which more than compensate for the impacts from increasing Asian emissions. It is
likely that climate change in the past decade has also affected the
intercontinental transport of O3. |
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