The nephelometer measures the total scattering and hemispheric backscattering of aerosol. Nephelometers are deployed in pairs, with one measuring the ambient conditions and the other measuring the scattering as a function of slowly increasing or decreasing relative humidity (RH). The combination can then be used to derive the hygroscopic growth factor as a function of RH: f(RH).
The nephelometer is part of the aerosol observing system (AOS).
| Facility Name | Start Date |
|---|---|
| Gunnison, CO; Supplemental Facility 2 | 2021-10-27 |
| Houston, TX; AMF1 (main site for TRACER) | 2021-09-08 |
| Lamont, OK (Extended and Co-located with C1) | 2016-11-15 |
| Barrow, Alaska, new building (NAD83) at NOAA facility | 2020-10-22 |
| Graciosa Island, Azores, Portugal | 2013-10-04 |
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