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| Titel |
Water soluble aerosols and gases at a UK background site – Part 1: Controls of PM2.5 and PM10 aerosol composition |
| VerfasserIn |
M. M. Twigg, C. F. Di Marco, S. Leeson, N. van Dijk, M. R. Jones, I. D. Leith, E. Morrison, M. Coyle, R. Proost, A. N. M. Peeters, E. Lemon, T. Frelink, C. F. Braban, E. Nemitz, J. N. Cape |
| 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 ; 15, no. 14 ; Nr. 15, no. 14 (2015-07-23), S.8131-8145 |
| Datensatznummer |
250119922
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| Publikation (Nr.) |
 copernicus.org/acp-15-8131-2015.pdf |
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| Zusammenfassung |
| There is limited availability of long-term, high temporal resolution,
chemically speciated aerosol measurements which can provide further insight
into the health and environmental impacts of particulate matter. The Monitor
for AeRosols and Gases (MARGA, Applikon B.V., NL) allows for the characterisation of
the inorganic components of PM10 and PM2.5 (NH4+,
NO3-, SO42-, Cl-, Na+, K+, Ca2+,
Mg2+) and inorganic reactive gases (NH3, SO2, HCl, HONO and
HNO3) at hourly resolution. The following study presents 6.5 years
(June 2006 to December 2012) of quasi-continuous observations of
PM2.5 and PM10 using the MARGA at the UK EMEP supersite,
Auchencorth Moss, SE Scotland. Auchencorth Moss was found to be
representative of a remote European site with average total water soluble
inorganic mass of PM2.5 of 3.82 μg m−3. Anthropogenically
derived secondary inorganic aerosols (sum of NH4+, NO3-
and nss-SO42−) were the dominating species (63 %) of
PM2.5. In terms of equivalent concentrations, NH4+ provided
the single largest contribution to PM2.5 fraction in all seasons. Sea
salt was the main component (73 %) of the PMcoarse fraction
(PM10-PM2.5), though NO3- was also found to make a
relatively large contribution to the measured mass (17 %) providing
evidence of considerable processing of sea salt in the coarse mode. There
was on occasions evidence of aerosol from combustion events being
transported to the site in 2012 as high K+ concentrations (deviating
from the known ratio in sea salt) coincided with increases in black carbon
at the site. Pollution events in PM10 (defined as concentrations
> 12 μg m−3) were on average dominated by
NH4+ and NO3-, where smaller loadings at the site
tended to be dominated by sea salt. As with other western European sites,
the charge balance of the inorganic components resolved were biased towards
cations, suggesting the aerosol was basic or more likely that organic acids
contributed to the charge balance. This study demonstrates the UK background
atmospheric composition is primarily driven by meteorology with sea salt
dominating air masses from the Atlantic Ocean and the Arctic, whereas
secondary inorganic aerosols tended to dominate air masses from continental
Europe. |
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