A survey of jet aircraft PM by TEM in APEX III

- Visualization of jet engine soot by high-resolution electron microscopy (HRTEM).
- Comparative geometric descriptors of soot morphology.
- Physical structure of jet soot for improved health and climate impact assessments.

Results are reported for sampling non-volatile particulate matter from field tests during the NASA led APEX III campaign. This paper reports observations of particulate emissions collected from a suite of jet engine aircraft to assess differences and similarities in soot macro- micro- and nanostructure using TEM. Aggregates are compact, primary particle sizes varied and nanostructure is mixed. Comparisons are made to soot from a laboratory flame as a well-studied reference. Results are interpreted in terms of turbulence interacting with the different stages of particle formation and growth with implications for atmospheric processing and climate impact.

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