Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Accuracy of ground surface broadband shortwave radiation monitoring

Abstract : The uncertainty of broadband shortwave radiation monitoring is determined for direct, diffuse, and global irradiance for measurements obtained at the Payerne (Switzerland) station of the Baseline Surface Radiation Network (BSRN). The uncertainty estimates include sources that reflect realistic long-term operation conditions. The uncertainties are derived using the methodology specified by the "Guide to the expression of uncertainty in measurement." The differences between redundant determinations of direct, diffuse, and global irradiance are analyzed and are shown to be compatible with the uncertainties. In addition, the signatures of some uncertainty sources are sought within the error statistics to find out if corrections can be applied and what their magnitude is. The global and diffuse irradiance uncertainties range from 1.8% to 2.4% without correction and are less than 1.8% with corrections. These uncertainties are close to or satisfy the BSRN targets for large signals (global: 1000 W m À2 , diffuse: 500 W m-2). For small signals (50 W m-2), the targets are not achieved, mainly as a result of uncertainties associated with the data acquisition electronics (DAQ). The direct irradiance uncertainty is ~1.5%, 3 times larger than the BSRN uncertainty target. An accuracy gain can also be achieved at the DAQ level, but even without considering the DAQ uncertainty, the target is exceeded by a factor of about 2. The direct irradiance uncertainty remains ~1% even using an absolute cavity radiometer as transfer standard for correcting the pyrheliometer sensitivity. Thus, the direct irradiance accuracy target of 0.5% is probably not achievable with the best commercially available technology.
Liste complète des métadonnées

Littérature citée [23 références]  Voir  Masquer  Télécharger
Contributeur : Lucien Wald <>
Soumis le : mardi 3 février 2015 - 12:02:52
Dernière modification le : vendredi 4 décembre 2020 - 16:12:02
Archivage à long terme le : : lundi 4 mai 2015 - 10:46:23


Publication financée par une institution




Laurent Vuilleumier, Mathias Hauser, Christian Félix, Franck Vignola, Philippe Blanc, et al.. Accuracy of ground surface broadband shortwave radiation monitoring. Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2014, 119, pp.13838-13860. ⟨10.1002/2014JD022335⟩. ⟨hal-01112611⟩



Consultations de la notice


Téléchargements de fichiers