PFR AOD and solar irradiance data aquired during the MAPP project.

Aerosol optical depth  and  solar irradiance data acquired   in the frame  of the JRP project MAPP, Metrology for Aerosol Optical Properties 19ENV04 with the Precision FilterRadiometer PFR-98-N-001.   

Monitoring  period  at Davos, 2021 -2022

Rome Campaign – Sep.2021

Izaña  Campaign -Sep.2022

for  the  dataset of  version 1.0 the calibration  of the  PFR is  against  the PFR-Triad has  been  used. For the  SI-traceable AOD retrieval  the PTB (Physikalisch-Technische Bundesanstalt, Braunschweig, Germany) calibration (Kouremeti, Nevas et al. 2022)  has  been  used  in combination  with  QASUMEFTS (Gröbner, Kröger et al. 2017) for 368 nm and  412 nm, and TSIS-1  (Coddington, Richard et al. 2021) for  501 nm and 862 nm.

Calibration Record

The  calibration  record  given  as  Top-of-Atmosphere PFR signal (V0) and the expanded combined uncertainty of  V0  (U) are given  in the  following  table in Volts .

PFR-TRIAD (2021)

PTB

Langley Izaña

V0 (V)

U (V)

V0 (V)

U (V)

V0 (V)

U (V)

862nm

3.380

0.017

3.3602

0.006

3.376

0.003

501nm

3.717

0.010

3.7326

0.006

3.712

0.004

412nm

3.503

0.010

3.5368

0.010

3.493

0.005

368nm

4.011

0.012

4.0438

0.026

4.006

0.007

Data description 

The data are daily files in  matlab  table format (table  name PFR)

The table  contains  5 variables: 'Station' , 'Instrument' , 'Date' , 'Data' , 'MetaData_Flags'

The variables of each  sub-table and  theirs  units can  be seen  using  e.g. the  following :  

PFR.Data{1}.Properties.VariableNames, PFR.Data{1}.Properties.VariableUnits

The signal, irradiance and  atmospheric transmittance have been  corrected for  the  Sun-Earth distance  and  are given at 1AU.   

Measurements,  calibration  and  aanlysis  performed  by NK 

References

Coddington, O. M., E. C. Richard, D. Harber, P. Pilewskie, T. N. Woods, K. Chance, X. Liu and K. Sun (2021). "The TSIS-1 Hybrid Solar Reference Spectrum." Geophysical Research Letters 48(12): e2020GL091709.

Gröbner, J., I. Kröger, L. Egli, G. Hülsen, S. Riechelmann and P. Sperfeld (2017). "The high-resolution extraterrestrial solar spectrum (QASUMEFTS) determined from ground-based solar irradiance measurements." Atmos. Meas. Tech. 10(9): 3375-3383.

Kouremeti, N., S. Nevas, S. Kazadzis, J. Gröbner, P. Schneider and K. M. Schwind (2022). "SI-traceable solar irradiance measurements for aerosol optical depth retrieval." Metrologia 59(4): 044001.

Acknowledgments

This data was obtained within the joint research project EMPIR 19ENV04 MAPP “Metrology for aerosol optical properties” which has been supported by the European Metrology Program for Innovation and Research (EMPIR) . The EMPIR is jointly funded by the EMPIR participating countries within EURAMET and the European Union.