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| Titel |
Influence of biomass burning and anthropogenic emissions on ozone, carbon monoxide and black carbon at the Mt. Cimone GAW-WMO global station (Italy, 2165 m a.s.l.) |
| VerfasserIn |
P. Cristofanelli, F. Fierli, A. Marinoni, F. Calzolari, R. Duchi, J. Burkhart, A. Stohl, M. Maione, J. Arduini, P. Bonasoni |
| 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. 1 ; Nr. 13, no. 1 (2013-01-03), S.15-30 |
| Datensatznummer |
250011712
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| Publikation (Nr.) |
 copernicus.org/acp-13-15-2013.pdf |
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| Zusammenfassung |
This work investigates the variability of ozone (O3), carbon monoxide
(CO) and equivalent black carbon (BC) at the Italian Climate Observatory
"O. Vittori" (ICO-OV), part of the Mt. Cimone global GAW-WMO station
(Italy). For this purpose, ICO-OV observations carried out in the period
January 2007–June 2009, have been analyzed and correlated with the
outputs of the FLEXPART Lagrangian dispersion model to specifically evaluate
the influence of biomass burning (BB) and anthropogenic emissions younger
than 20 days. During the investigation period, the average O3, CO and
BC at ICO-OV were 54 ± 3 ppb, 122 ± 7 ppb and 213 ± 34 ng m−3
(mean ± expanded uncertainty with p < 95%), with
clear seasonal cycles characterized by summer maxima and winter minima for
O3 and BC and spring maximum and summer minimum for CO.
According to FLEXPART outputs, BB impact is maximized during the warm months
from July to September but appeared to have a significant contribution to
the observed tracers only during specific transport events. We characterised
in detail five "representative" events with respect to transport scales
(i.e. global, regional and local), source regions and O3, CO and BC
variations. For these events, very large variability of enhancement ratios
O3/CO (from −0.22 to 0.71) and BC/CO (from 2.69 to 29.83 ng m−3 ppb−1) were observed.
CO contributions related with anthropogenic emissions (COant)
contributed to 17.4% of the mean CO value observed at ICO-OV, with the
warm months appearing particularly affected by transport events of
air-masses rich in anthropogenic pollution. The proportion of tracer
variability that is described by FLEXPART COant peaked to 37% (in
May–September) for CO, 19% (in May–September) for O3 and 32%
(in January–April) for BC. During May–September, the analysis of the
correlation among CO, O3 and BC as a function of the COant
indicated that ICO-OV was influenced by air-masses rich in anthropogenic
pollution transported from the regional to the global scale. On the other
side, CO and O3 were negatively correlated during October–December,
when FLEXPART does not show significant presence of recent anthropogenic
emissions and only a few observations are characterized by enhanced BC. Such
behaviour may be attributed to an ensemble of processes concurrent in
enhancing O3 with low CO (upper troposphere/lower stratosphere
intrusions) and to O3 titration by NO in polluted air-masses along with
lower photochemical activity. An intermediate situation occurs in
January–April when CO and O3 were almost uncorrelated and BC
enhancements were associated to relatively old (10 days) anthropogenic
emissions. |
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