Department of Signal Processing and Acoustics

MAPP project (2020-2023)

Metrology Research Institute is involved in project MAPP - "Metrology for aerosol optical properties" financed by the European Metrology Programme for Innovation and Research (EMPIR).

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.

Optical radiometers monitoring environmental parameters including aerosols in an intercomapison campaign in Teneriffe 2016. (Figure by Tomi Pulli).
Optical radiometers monitoring environmental parameters including aerosols in an intercomapison campaign in Teneriffe 2016. (Figure by Tomi Pulli).

In the project, Metrology Research Institute will develop and utilize measurement setups for linearity and angular properties of radiometers. These are essential parameters for accurate measurements of aerosols. Also, nonuniformities of calibration sources will be studied. In the earlier environmental projects with the same consortium, we have developed novel simulation techniques to consider unknown correlations in uncertainty estimations. This work will be continued in the project and Aalto will use its gained experience in uncertainty evaluations with other partners.

Contact person: Petri Kärhä

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