Two different instruments were installed at the station during non overlapping periods:
- Ecotech Aurora 3000 Integrating Nephelometer from 2011 to 2021
- Ecotech Aurora 4000 Polar Integrating Nephelometer from 2022 onwards
These instruments measure both aerosol total scattering (σsp, between 10º and 170º) and back-scattering coefficients (σb, between 90º and 170º) at three wavelengths: 450 nm (blue), 525 nm (green) and 635 nm (red). The polar nephelometer offers also integrated scattering of up to 17 different angular sectors from 10˚ to 90˚.
Forward scatter can be calculated from subtracting backscatter from total scatter. The measured values are adjusted automatically and in real-time by on-board temperature and pressure sensors. The dimension of σsp are inverse length (inverse megameters Mm-1) and the instrument measurement range goes from <0.25 to 2000 Mm-1. Raw data is stored every minute.
Contact person in CHC: Isabel Moreno