Metrology for aerosol optical properties (MAPP)

The overall aim of this project co-ordinated by PMOD (Physicalisch-Meteorologische Observatorium Davos, Switzerland) is to enable the SI-traceable measurement of column-integrated aerosol optical properties retrieved from the passive remote sensing of the atmosphere using solar and lunar radiation measurements. Radiometers of the three largest aerosol monitoring networks will be calibrated at NMI laboratories. Also, portable devices for the in-field calibration of network radiometers will be developed in order to validate and improve the current aerosol optical property retrievals using state-of-the-art inversion models. The goal is to standardize aerosol optical properties retrieval by shortening the calibration chain, reduce calibration downtime of network radiometers, and to establish their consistent dissemination including their uncertainty.