ISKY: I-Skyradiometer
Purpose of Participation
- Derivation of the columnar spectral aerosol optical properties based on ground-based measurements at Rabben station
Instrument description
The instrument ISKY is used for measurements of the direct solar and diffused sky radiations. The spectral range is varied between 320 and 2200 nm, including the cloud channels. From the measurements, we can analyze the aerosol optical thickness, the refractive index, and the volume size distributions. With regard to the cloud properties, the analyzed method is not still established.
| Species | Aerosol (columnar AOD) |
| Method | Direct solar measurements / Sky radiance measurements |
| Quantity primary | Spectral aerosol optical depth |
| Quantity secondary | in case of spherical particles: volume size distribution / single scattering albedo / refractive index |
| Spectral range | 320 - 2200 nm (12 channels) |
| Altitude range | whole atmosphere |
| Vertical resolution | |
| Temporal resolution | 5 minute |
| Operation | Continuously only during no-rain conditions |
| Precision | ± 10% |
| Data availability (during campaign) | three month |
| Final data (after campaign) | six month |
Specific remarks
- ground-based system
References
Nakajima, T., Tonna, G., Rao, R. and Boi, P., 1996. Use of sky brightness measurements from ground for remote sensing of particulate polydispersions, App. Opt., 35, 2672-2686.
Shiobara, M., Tadahiro Hayasaka, T. Nakajima and M. Tanaka, 1991. Aerosol monitoring using a scanning spectral radiometer in Sendai, Japan. J. Meteorol. Soc. of Japan, 60: 57-70.