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| Titel |
Attributing and quantifying carbon monoxide sources affecting the Eastern Mediterranean: a combined satellite, modelling, and synoptic analysis study |
| VerfasserIn |
R. Drori, U. Dayan, D. P. Edwards, L. K. Emmons, C. Erlick |
| 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 ; 12, no. 2 ; Nr. 12, no. 2 (2012-01-25), S.1067-1082 |
| Datensatznummer |
250010548
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| Publikation (Nr.) |
 copernicus.org/acp-12-1067-2012.pdf |
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| Zusammenfassung |
| Pollutants from global sources are known to affect the Eastern Mediterranean
Shore (EMS). However, there has been no previous study explicitly locating
the European sources, characterizing their transport pathways, and
quantifying their contribution to local concentrations in the EMS. In the
current study, spatially tagged carbon monoxide was used as a tracer for
pollutant transport from Europe to the EMS over five consecutive years
(2003–2007) using the global chemical transport model MOZART-4. The model
results were compared against NOAA/GMD ground station data and remotely
sensed data from the Terra/MOPITT satellite and found to agree well on
monthly basis but do not agree on daily basis. On synoptic scale, there is
agreement between MOZART and GMD during July to August. A budget analysis
reveals the role of CO from hydrocarbon oxidation on CO concentration during
summer. European anthropogenic emissions were found to significantly
influence EM surface concentrations, while European biomass burning (BB)
emissions were found to have only a small impact on EM surface
concentrations. Over the five simulated years, only two European biomass
burning episodes contributed more than 10 ppb to surface CO concentrations
in the EM. CO enhancement in the EM during the summer was attributed to
synoptic conditions prone to favorable transport from Turkey and Eastern
Europe towards the EM rather than increased emissions. We attribute the
apparently misleading association between CO emitted from European BB and CO
enhancements over the EM to typical summer synoptic conditions caused by the
lingering of an anticyclone positioned over the Western and Central
Mediterranean Basin that lead to forest fires in the area. Combined with a
barometric trough over the eastern part of the Mediterranean Basin, this
generates a prevailing transport of air masses from Eastern Europe to the
EMS. Synoptic scale variations are shown to change the transport pathways
from Europe towards the EMS having an overall small affect. CO concentration
over the EMS can be describe as having 3 components: the seasonal cycle, the
cycle of CO produced from hydrocarbon oxidation and a synoptic variation. |
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