| Autor: |
W. R. Shu, Rudolf B. Husar |
| Rok vydání: |
1975 |
| Předmět: |
|
| Zdroj: |
Journal of Applied Meteorology. 14:1558-1565 |
| ISSN: |
0021-8952 |
| DOI: |
10.1175/1520-0450(1975)014<1558:taotla>2.0.co;2 |
| Popis: |
It has been shown by earlier studies on the formation of the Los Angeles smog aerosol, that a significant fraction of the particulate matter in the visible size range is made by secondary gas-particle conversion processes, and that it consists mainly of liquid matter. In this study the volatility was studied quantitatively by heating the smog aerosol up to 250°C and simultaneously measuring the scattering coefficient using a nephelometer and the change of size distribution by an optical counter. The thermal analyses revealed that 50–80% of the submicron aerosol mass is volatile at 220°C. Inspection of the shapes of thermo-nephelograms (bscat vs temperature) also revealed that photochemically formed aerosols have distinctly different thermo-nephelograms than those obtained on humid “hazy” days. Thus it is suggested that thermal analyses may at least in some instances provide the means of on-line monitoring the origin of the ambient aerosol. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
