Atmospheric homogeneous nucleation
نویسندگان
چکیده
Atmospheric Chemistry and Physics Discussions This discussion paper is/has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP if available. Abstract We report laboratory observations of H 2 SO 4 and H 2 O homogeneous nucleation made under atmospherically relevant conditions ([H 2 SO 4 ] of 10 6 – 10 7 cm −3 and 287 K). Our observations show that nucleation takes place at [H 2 SO 4 ] of 10 6 – 10 7 cm −3 , as observed in the atmosphere. The slope of nucleation rate (J) vs. [H 2 SO 4 ] ranges be-5 tween 4–6, consistent with thermodynamic predictions of neutral H 2 SO 4 clusters, but is higher than those observed in the atmosphere. These results indicate that ternary aerosol precursors are needed to reduce the slope to 1–2 in the atmosphere. This study also discusses the effects of experimental parameters on laboratory observation results, in order to properly interpret the experimental data.
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