Spectral radiation

Last update: Mar. 2018

    Objective - Characteristics of the service - Steps of developments - Bibliography Spectral


Objective of the service

Deliver time series of spectral radiation values in the spectral band interval required by the user, in all weather conditions (not only clear sky).


Inputs: McClear clear sky values


Steps of developments

(reverse chronological order)

29 Nov. 2017: rdv au CIEMAT. Discussion with the team about spectral developments

Oct. 2017: McClear v2 to McClear v3 => Stéphane is checking if ok. Correction of compute_gc_mcclear to correct the use of E0 (broadband instead of Kato)

Sept. 2017: McClear in real time

Aug. 2017: Self validation and first delivery of spectral radiation datasets to a user. Validation against in situ measurements is not yet carried out.

July: Bug in McClear v2 (change of atmospheric profile during the day generating sharp steps of radiation values). This has been corrected during the maintenance operation that occurred on 31st July 2017 (information not available in the release not as it impacted only the spectral data which is not an operational service).

Spring 2017: First developments of a precursor of service in Matlab following the work of William

2016 and before: research carried out by William Wandji, a PhD student from MINES ParisTech

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Bibliography Spectral

(In alphabetic order and and reverse chronological order)


Aculinin et al. 2016 Aculinin A., C. Brogniez, M. Bengulescu, D. Gillotay, et al. 2016. "Assessment of Several Empirical Relationships for Deriving Daily Means of UV-A Irradiance from Meteosat-Based Estimates of the Total Irradiance" Remote Sensing, MDPI, 2016, 8 (7), pp.537. UV-A from broadband



Kato et al. 1999 Kato S., T. Ackerman, J.  Mather, E. Clothiaux, 1999. "The k-distribution method and correlated-k approximation  for  shortwave  radiative  transfer  model" Journal of Quantitative Spectroscopy and Radiative Transfer 62, 109-121. DOI:10.1016/S0022-4073(98)00075-2. Kato




Wald 2012 Wald L., 2012. "Elements on the Computation of UV Maps in the Eurosun Database" Internal Report. 2012. UV from broadband




Wandji Nyamsi 2015

Thèse de William Wandji Nyamsi W., 2015. "Vers une méthode automatique d'estimation de la distribution spectrale du rayonnement solaire. Cas du ciel clair. : Applications à la lumière du jour, photosynthèse et ultraviolet" Ecole Nationale Supérieure des Mines de Paris, 2015. Français

PAR et UV from Kato




Wandji Nyamsi et al. 2015

Wandji Nyamsi W., B. Espinar, P. Blanc, and L. Wald, 2012. "Estimating the photosynthetically active radiation under clear skies by means of a new approach" Advances in Science and Research, Copernicus Publications, 2015, 12, pp.5 – 10

PAR from Kato





Wandji Nyamsi et al. 2014 Wandji Nyamsi W., B. Espinar, P. Blanc, and L. Wald, 2014. "How close to detailed spectral calculations is the k-distribution method and correlated-k approximation of Kato et al. (1999) in each spectral interval?" Meteorologische Zeitschrift, Borntraeger Science Publishers, 2014, 23, pp.547 - 556. Kato

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