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

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Atmos. Meas. Tech., 10, 1169-1179, 2017
https://doi.org/10.5194/amt-10-1169-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
21 Mar 2017
Pyranometer offsets triggered by ambient meteorology: insights from laboratory and field experiments
Sandro M. Oswald1,2,3, Helga Pietsch2, Dietmar J. Baumgartner4, Philipp Weihs3, and Harald E. Rieder1,2,5 1Wegener Center for Climate and Global Change, Graz, Austria
2Institute for Geophysics, Astrophysics and Meteorology, Institute of Physics, Graz, Austria
3Institute of Meteorology, University of Natural Resources and Life Sciences (BOKU), Vienna, Austria
4Kanzelhöhe Observatory for Solar and Environmental Research, Graz, Austria
5Austrian Polar Research Institute, Vienna, Austria
Abstract. This study investigates the effects of ambient meteorology on the accuracy of radiation (R) measurements performed with pyranometers contained in various heating and ventilation systems (HV-systems). It focuses particularly on instrument offsets observed following precipitation events. To quantify pyranometer responses to precipitation, a series of controlled laboratory experiments as well as two targeted field campaigns were performed in 2016. The results indicate that precipitation (as simulated by spray tests or observed under ambient conditions) significantly affects the thermal environment of the instruments and thus their stability. Statistical analyses of laboratory experiments showed that precipitation triggers zero offsets of −4 W m−2 or more, independent of the HV-system. Similar offsets were observed in field experiments under ambient environmental conditions, indicating a clear exceedance of BSRN (Baseline Surface Radiation Network) targets following precipitation events. All pyranometers required substantial time to return to their initial signal states after the simulated precipitation events. Therefore, for BSRN-class measurements, the recommendation would be to flag the radiation measurements during a natural precipitation event and 90 min after it in nighttime conditions. Further daytime experiments show pyranometer offsets of 50 W m−2 or more in comparison to the reference system. As they show a substantially faster recovery, the recommendation would be to flag the radiation measurements within a natural precipitation event and 10 min after it in daytime conditions.

Citation: Oswald, S. M., Pietsch, H., Baumgartner, D. J., Weihs, P., and Rieder, H. E.: Pyranometer offsets triggered by ambient meteorology: insights from laboratory and field experiments, Atmos. Meas. Tech., 10, 1169-1179, https://doi.org/10.5194/amt-10-1169-2017, 2017.
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This study investigates effects of precipitation events on the accuracy of solar radiation measurements. To quantify pyranometer responses to precipitation, a series of controlled laboratory experiments and two field campaigns were performed. The results indicate that precipitation significantly affects the thermal environment of the instruments and thus their stability. A high accuracy of solar radiation measurements is important to improve the prediction of Earth's climate change.
This study investigates effects of precipitation events on the accuracy of solar radiation...
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