Measurement traceability and data quality are essential requirements by the WMO for monitoring atmospheric aerosol optical properties by International radiometer networks.However, it is really important developing and validating new “on site” calibration procedures, to be compared with the programs of traceability to CIMO defined standard instruments and methods. “On site” methodologies allow frequent traceability of measurements and avoid internal inevitable changes of the equipment due to their shipping, that can alter also the most accurate calibration of master instruments.
The QUATRAM campaigns are aimed to evaluating both the homogeneity and comparability among measurements performed by equipment of different International Networks and/or manufactures, and the accuracy of new “on site” calibration procedures.
The approach consists in performing a calibration transfer from a primary master PFR of the PMOD/WRC to the other instrumentation, in the comparison of AODs at the common wavelengths and in the evaluation of the on-site calibration procedures. The campaigns were held in both urban (Rome) and mountain (Davos) sites so as to consider different atmospheric turbidity and optical characteristic.
| QUATRAM1 | Davos | 08/10/2017-08/31/2017 | 1 GAW-PFR, 1 SKYNET-PREDE POM |
| QUATRAM1 | Rome | 09/22/2017-03/11/2017 | 1 GAW-PFR, 1 AERONET-CIMEL, 4 SKYNET-PREDE POMs, 2 MIDDLETON, 1. PANDORA, 2 MFRSR, 1 MICROTOP |
| QUATRAM2 | Davos | 24/07/2018-19/10/2018 | 1 GAW-PFR, 1 SKYNET-PREDE POM |
| QUATRAM2 | Rome | 01/05/2019-30/09/2019 | 1 GAW-PFR, 1 AERONET-CIMEL, 3 SKYNET-PREDE POMs, 1 PANDORA |
| QUATRAM3 | Rome | 03/09/2021-20/09/2021, within MAPP | 1 GAW-PFR, 4 AERONET-CIMEL, 3 SKYNET-PREDE POMs, 1 PANDORA |
| QUATRAM3 | Davos | 07/10/2021-19/10/2021, within FRC-V | 1 GAW-PFR, 1 SKYNET-PREDE POM |