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ClNO2 and nitrate formation via N2O5 uptake to particles: Derivation of N2O5 uptake coefficients from ambient datasets
Phillips, Gavin J. Thieser, Jim Tang, Mingjin Sobanski, Nicolas Fachinger, Johannes Drewnick, Frank Lelieveld, Jos Crowley, John N.
Phillips, Gavin J.
Thieser, Jim
Tang, Mingjin
Sobanski, Nicolas
Fachinger, Johannes
Drewnick, Frank
Lelieveld, Jos
Crowley, John N.
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2015-02-25
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conference abstract
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Abstract
We present estimates of the uptake coefficient of N2O5 using ambient measurements of the trace gases N2O5 and ClNO2 and particle composition and surface area at the Kleiner Feldberg observatory, near Frankfurt, SW Germany, during the PARADE campaign (summer 2011). Three methods used to extract gamma(N2O5) from the datasets were found to be in reasonable agreement, generating values between 0.001 and 0.4. Gamma (N2O5) displayed a significant dependence on relative humidity (RH), the largest values obtained, as expected, at high RH. No significant dependence of gamma(N2O5) on particle organic content or sulphate-to-organic ratio was observed. The variability in gamma(N2O5) is however large, indicating that humidity is not the sole factor determining the uptake coefficient. There is also an indication that the yield of ClNO2 with respect to N2O5 uptake is larger with lower concentrations of PM1 total organics. Our results will be compared to existing uptake coefficients from laboratory studies and those derived from field observations.
Citation
Phillips et al. (2015). Geophysical Research Abstracts, 2015, 17, EGU2015-10435.
Publisher
Copernicus Publications
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Geophysical Research Abstracts
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Conference Contribution
Language
en
Description
Oral presentation abstract given at EGU General Assembly 2015.
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1607-7962
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