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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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doi:10.5194/amt-2017-41
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
22 Mar 2017
Review status
This discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
Revising short and longwave radiation archives in view of possible revisions of the WSG and WISG reference scales: Methods and implications
Stephan Nyeki1, Stefan Wacker2, Julian Gröbner1, Wolfgang Finsterle1, and Martin Wild3 1Physikalisch Meteorologisches Observatorium and World Radiation Centre (PMOD/WRC), Davos, Switzerland
2Asiaq, Greenland Survey, Nuuk, Greenland
3IACETHZ, Zürich, Switzerland
Abstract. A large number of radiometers are traceable to the World Standard Group (WSG) for shortwave radiation and the interim World Infra-red Standard Group (WISG) for longwave radiation, hosted by the Physikalisch Meteorologisches Observatorium Davos/World Radiation Centre (PMOD/WRC, Davos, Switzerland). The WSG and WISG have recently been found to over- and underestimate radiation values, respectively (Fehlmann et al., 2012; Gröbner et al., 2014), although research is still ongoing. In view of a possible revision of the reference scales of both standard groups, this study discusses the methods involved, and the implications on existing archives of radiation time-series, such as the Baseline Surface Radiation Network (BSRN). Based on PMOD/WRC calibration archives and BSRN data archives, the downward longwave radiation (DLR) time-series over the 2006–2015 periods were analysed at four stations (polar and mid-latitude locations). DLR was found to increase by up to 3.5 and 5.4 W m−2, respectively, after applying a WISG reference scale correction and a minor correction for the dependence of pyrgeometer sensitivity on atmospheric integrated water vapour content. Similar increases in DLR may be expected at other BSRN stations. Based on our analysis, a number of recommendations are made for future studies.

Citation: Nyeki, S., Wacker, S., Gröbner, J., Finsterle, W., and Wild, M.: Revising short and longwave radiation archives in view of possible revisions of the WSG and WISG reference scales: Methods and implications, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2017-41, in review, 2017.
Stephan Nyeki et al.
Stephan Nyeki et al.
Stephan Nyeki et al.

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Short summary
A large number of radiometers to measure solar and terrestrial broadband radiation are traceable to World Standard Groups at PMOD/WRC in Davos, Switzerland. A small correction of each Group may be required in the future, and this study examines the methods and implications of this on data-sets collected at four remote baseline stations since the 1990s. The goal is to develop a better estimate of the solar and terrestrial radiation budget at the Earths surface.
A large number of radiometers to measure solar and terrestrial broadband radiation are traceable...
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