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| Titel |
Significant concentrations of nitryl chloride observed in rural continental Europe associated with the influence of sea salt chloride and anthropogenic emissions |
| VerfasserIn |
G. J. Phillips, M. J. Tang, J. Thieser, B. Brickwedde, G. Schuster, J. N. Crowley |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250060660
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| Zusammenfassung |
| Recent observations of significant concentrations of nitryl chloride (ClNO2) over the North
American continent, far from coastal regions, have highlighted a potentially important source
of reactive halogens in the continental lower troposphere. Nitryl chloride, formed nocturnally
by the heterogeneous reaction of N2O5 with aqueous-phase chloride, is readily
photolysed producing NO2 and chlorine radical. We report measurement of significant
quantities of nitryl chloride, up to 800 pptv, during the Particles and Radicals: Diel
observations of the impact of urban and biogenic Emissions (PARADE) measurement
campaign at a mountaintop field site in Hessen Germany, 350 km from the nearest
coastline, using chemical ionization mass spectrometry (CIMS). ClNO2 was detected
during the majority of nights between the 15th August and 16th September 2011, the
largest mixing fractions of ClNO2 being associated with air masses influenced by sea
salt and anthropogenic emissions. ClNO2 persisted in measurable quantities until
early afternoons on days with foggy conditions and low photolysis frequencies. |
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