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| Titel |
The effect of trimethylamine on atmospheric nucleation involving H₂SO₄ |
| VerfasserIn |
M. E. Erupe, A. A. Viggiano, S.-H. Lee |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 10 ; Nr. 11, no. 10 (2011-05-20), S.4767-4775 |
| Datensatznummer |
250009754
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| Publikation (Nr.) |
 copernicus.org/acp-11-4767-2011.pdf |
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| Zusammenfassung |
| Field observations and quantum chemical calculations have shown that organic
amine compounds may be important for new particle formation involving
H2SO4. Here, we report laboratory observations that investigate
the effect of trimethylamine (TMA) on H2SO4-H2O nucleation
made under aerosol precursor concentrations typically found in the lower
troposphere ([H2SO4] of 106−107 cm−3; [TMA] of
180–1350 pptv). The threshold [H2SO4] needed to produce the
unity J was from 106−107 cm−3 and the slopes of Log J vs. Log
[H2SO4] and Log J vs. Log [TMA] were 4–6 and 1, respectively,
strikingly similar to the case of ammonia (NH3 ternary nucleation
(Benson et al., 2011). At lower RH, however, enhancement in J due to TMA
was up to an order of magnitude greater than that due to NH3. These
findings imply that both amines and NH3 are important nucleation
species, but under dry atmospheric conditions, amines may have stronger
effects on H2SO4 nucleation than NH3. Aerosol models should
therefore take into account inorganic and organic base compounds together to
fully understand the widespread new particle formation events in the lower troposphere. |
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