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A large number of radiometers are traceable to the World Standard\udGroup (WSG) for shortwave radiation and the interim World Infrared Standard\udGroup (WISG) for longwave radiation, hosted by the Physikalisch-Meteorologisches Observatorium Davos/World Radiation Centre (PMOD/WRC, Davos,\udSwitzerland). The WSG and WISG have recently been found to over- and\udunderestimate radiation values, respectively (Fehlmann et al., 2012;\udGröbner et al., 2014), although research is still ongoing. In view of a\udpossible revision of the reference scales of both standard groups, this study\uddiscusses the methods involved and the implications on existing archives of\udradiation time series, such as the Baseline Surface Radiation Network (BSRN).\udBased on PMOD/WRC calibration archives and BSRN data archives,\udthe downward longwave radiation (DLR) time series over the 2006–2015 period were\udanalysed at four stations (polar and mid-latitude locations). DLR was found\udto increase by up to 3.5 and 5.4 W m<sup>−2</sup> for all-sky and clear-sky\udconditions, respectively, after applying a WISG reference scale correction\udand a minor correction for the dependence of pyrgeometer sensitivity on\udatmospheric integrated water vapour content. Similar increases in DLR may be\udexpected at other BSRN stations. Based on our analysis, a number of\udrecommendations are made for future studies

Revising shortwave and longwave radiation archives in view of possible revisions of the WSG and WISG reference scales: methods and implications