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| Titel |
Aerosol climatology and planetary boundary influence at the Jungfraujoch analyzed by synoptic weather types |
| VerfasserIn |
M. Collaud Coen, E. Weingärtner, M. Furger, S. Nyeki, A. S. H. Prévôt, M. Steinbacher, U. Baltensperger |
| 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 ; 11, no. 12 ; Nr. 11, no. 12 (2011-06-23), S.5931-5944 |
| Datensatznummer |
250009866
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| Publikation (Nr.) |
 copernicus.org/acp-11-5931-2011.pdf |
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| Zusammenfassung |
| Fourteen years of meteorological parameters, aerosol variables (absorption
and scattering coefficients, aerosol number concentration) and trace gases
(CO, NOx, SO2) measured at the Jungfraujoch (JFJ, 3580 m a.s.l.) have
been analyzed as a function of different synoptic weather types. The
Schüepp synoptic weather type of the Alps (SYNALP) classification from
the Alpine Weather Statistics (AWS) was used to define the synoptic
meteorology over the whole Swiss region. The seasonal contribution of each
synoptic weather type to the aerosol concentration was deduced from the
aerosol annual cycles while the planetary boundary layer (PBL) influence was
estimated by means of the diurnal cycles. Since aerosols are scavenged by
precipitation, the diurnal cycle of the CO concentration was also used to
identify polluted air masses. SO2 and NOx concentrations were used
as precursor tracers for new particle formation and growth, respectively.
The aerosol optical parameters and number concentration show elevated
loadings during advective weather types during the December–March period and
for the convective anticyclonic and convective indifferent weather types
during the April–September period. This study confirms the consensus view
that the JFJ is mainly influenced by the free troposphere during winter and
by injection of air parcels from the PBL during summer. A more detailed
picture is, however, drawn where the JFJ is completely influenced by free
tropospheric air masses in winter during advective weather types and largely
influenced by the PBL also during the night in summer during the subsidence
weather type. Between these two extreme situations, the PBL influence at the
JFJ depends on both the time of year and the synoptic weather type. The
fraction of PBL air transported to the JFJ was estimated by the relative
increase of the specific humidity and CO. |
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