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| Titel |
Sulphuric Acid Measurements by CIMS - Uncertainties and Consistency between Various Data Sets |
| VerfasserIn |
Christian Plaß-Dülmer, Thomas Elste, Pauli Paasonen, Tuukka Petäjä |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250055995
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| Zusammenfassung |
| Sulfuric acid is one of the key components in new particle formation in the atmosphere.
Nucleation rate and the number concentration of freshly nucleated particles are both observed
to strongly depend on sulfuric acid concentration. Though some advances have been
achieved, measurement of gas phase sulfuric acid is still challenging due to extremely low
concentrations of typically below some 107 molecules cm-3, the stickiness to surfaces, the
tendency to form molecule- and molecule-ion-clusters and difficulties in calibration.
Measurements are performed exclusively by chemical ionization mass spectrometry (CIMS)
with the substantial drawback that no independent method to validate the CIMS-H2SO4
measurements is available. Direct calibration is hardly possible since gaseous concentrations
of H2SO4 in the range of ambient concentrations, e.g. |
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