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| Titel |
Vertical distribution of sub-micron aerosol chemical composition from North-Western Europe and the North-East Atlantic |
| VerfasserIn |
W. T. Morgan, J. D. Allan, K. N. Bower, G. Capes, J. Crosier, P. I. Williams, H. Coe |
| 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 ; 9, no. 15 ; Nr. 9, no. 15 (2009-08-03), S.5389-5401 |
| Datensatznummer |
250007548
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| Publikation (Nr.) |
 copernicus.org/acp-9-5389-2009.pdf |
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| Zusammenfassung |
| A synthesis of UK based airborne in-situ measurements of aerosol properties
representing air masses from North-West Europe and the North-East Atlantic is
presented. The major focus of the study is the vertical distribution of
sub-micron aerosol chemical composition. Vertical profiles are derived from a
Quadrupole Aerosol Mass Spectrometer (Q-AMS). Background sub-micron aerosol
vertical profiles are identified and are primarily composed of organic matter
and sulphate aerosol. Such background conditions occurred predominantly
during periods associated with long-range air mass transport across the
Atlantic. These instances may serve as useful model input of aerosol to
Western Europe. Increased mass concentration episodes are coincident with
European outflow and periods of stagnant/recirculating air masses. Such
periods are characterised by significantly enhanced concentrations of nitrate
aerosol relative to those of organic matter and sulphate. Periods of enhanced
ground level PM2.5 loadings are coincident with instances of high nitrate
mass fractions measured on-board the aircraft, indicating that nitrate is a
significant contributor to regional pollution episodes. The vertical
structure of the sulphate and organic aerosol profiles were shown to be
primarily driven by large-scale dynamical processes. The vertical
distribution of nitrate is likely determined by both dynamic and
thermodynamic processes, with chemical partitioning of gas phase precursors
to the particle phase occurring at lower temperatures at the top of the
boundary layer. Such effects have profound implications for the aerosol's
lifetime and subsequent impacts, highlighting the requirement for accurate
representation of the aerosol vertical distribution. |
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