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| Titel |
Deriving a speciated atmospheric nitrogen budget at Auchencorth Moss, a background site in South East Scotland |
| VerfasserIn |
Marsailidh Twigg, Eleonora Aruffo, John Kentisbeer, Christopher Malley, Sarah Leeson, Matthew Jones, Eiko Nemitz, Piero Di Carlo, Christine Braban |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250109163
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| Publikation (Nr.) |
 EGU/EGU2015-9044.pdf |
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| Zusammenfassung |
| Since 2006, the EMEP supersite, Auchencorth Moss, has routinely measured HNO3, HONO,
NO, NO2, NH3 and speciated aerosols including NH4+ and NO3- in PM2.5 and
PM10. It is known that other reactive N species are important in the atmosphere at
background sites including PANs, peroxy nitrates, alkyl nitrates, ClNO2 and N2O5 and
routine measurements are not frequently assessed against these other species. The
following study presents the highlights from an intensive study, in spring 2014, where
non-routine measurements (TD-LIF and PAN GC) were carried out alongside routine
measurements (MARGA, ANNOx, NOxThermoFisher Analyser). The objectives of
the study were to understand further the role of non-routine measured species in
the N budget at this site and to try to identify potential artefacts in current routine
measurements.
Initial comparison studies suggest that routine measurements capture well the
temporal variations in NOx and HNO3, though questions remain on the accuracy of
the measurements. During the study on average low concentrations of all species
(NO2 = 1.58 ppb, NH3 = 2.3 ppb, HNO3 = 0.09 ppb, HONO= 0.07 ppb) were
observed, though there were periods where polluted air masses arrived at the site
resulting in an increase in both routine and non-routine measured species. As well as
air masses transporting N species, there was evidence of atmospheric chemical
transformations of N species at the site, including the photochemical production of PAN. |
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