The particle soot absorption photometer collects aerosol particles on a substrate and measures the change in light transmission relative to a reference filter. Bulk particle absorption is derived after correcting for scattering effects.
The PSAP is part of the aerosol observing system (AOS).
| Facility Name | Instrument Start Date |
|---|---|
| Graciosa Island, Azores, Portugal | 2013-10-04 |
| Lamont, OK (Extended and Co-located with C1) | 2016-11-14 |
| Oliktok Point, Alaska; AMF3 | 2016-08-06 |
| Houston, TX; AMF1 (main site for TRACER) | 2021-04-14 |
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