Abstract relates to a poster presentation at the European Geosciences Union General Assembly 2015

Aruffo, Eleonora

Braban, Christine

Di Carlo, Piero

Jones, Matthew

Kentisbeer, John

Leeson, Sarah

Malley, Christopher

Nemitz, Eiko

Twigg, Marsailidh

NERC Open Research Archive

Geophysical Research AbstractsVol. 17, EGU2015-9044-1, 2015EGU General Assembly 2015© Author(s) 2015. CC Attribution 3.0 License.Deriving a speciated atmospheric nitrogen budget at Auchencorth Moss, abackground site in South East ScotlandMarsailidh Twigg (1), Eleonora Aruffo (2), John Kentisbeer (1), Christopher Malley (1,3), Sarah Leeson (1),Matthew Jones (1), Eiko Nemitz (1), Piero Di Carlo (2), and Christine Braban (1)(1) Centre for Ecology and Hydrology, Bush Estate, Penicuik, United Kingdom, (2) Center of Excellence CETEMPS,Universita’ degli studi di L’Aquila,Via Vetoio, 67010 Coppito, L’Aquila, Italy, (3) School of Chemistry, University ofEdinburgh, Edinburgh, United KingdomSince 2006, the EMEP supersite, Auchencorth Moss, has routinely measured HNO3, HONO, NO, NO2, NH3 andspeciated aerosols including NH+4 and NO−3 in PM2.5 and PM10. It is known that other reactive N species areimportant in the atmosphere at background sites including PANs, peroxy nitrates, alkyl nitrates, ClNO2 and N2O5and routine measurements are not frequently assessed against these other species. The following study presents thehighlights from an intensive study, in spring 2014, where non-routine measurements (TD-LIF and PAN GC) werecarried out alongside routine measurements (MARGA, ANNOx, NOxThermoFisher Analyser). The objectives ofthe study were to understand further the role of non-routine measured species in the N budget at this site and to tryto identify potential artefacts in current routine measurements.Initial comparison studies suggest that routine measurements capture well the temporal variations in NOx andHNO3, though questions remain on the accuracy of the measurements. During the study on average low concen-trations 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 andnon-routine measured species. As well as air masses transporting N species, there was evidence of atmosphericchemical transformations of N species at the site, including the photochemical production of PAN.

Deriving a speciated atmospheric nitrogen budget at Auchencorth Moss, a background site in south east Scotland

http://nora.nerc.ac.uk/510668/7/N510668AB.pdf

Deriving a speciated atmospheric nitrogen budget at Auchencorth Moss, a background site in south east Scotland

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