NDLI: The uncertainty of UTCI due to uncertainties in the determination of radiation fluxes derived from measured and observed meteorological data

Content Provider	Springer Nature Link
Author	Weihs, Philipp Staiger, Henning Tinz, Birger Batchvarova, Ekaterina Rieder, Harald Vuilleumier, Laurent Maturilli, Marion Jendritzky, Gerd
Copyright Year	2011
Abstract	In the present study, we investigate the determination accuracy of the Universal Thermal Climate Index (UTCI). We study especially the UTCI uncertainties due to uncertainties in radiation fluxes, whose impacts on UTCI are evaluated via the mean radiant temperature (Tmrt). We assume “normal conditions”, which means that usual meteorological information and data are available but no special additional measurements. First, the uncertainty arising only from the measurement uncertainties of the meteorological data is determined. Here, simulations show that uncertainties between 0.4 and 2 K due to the uncertainty of just one of the meteorological input parameters may be expected. We then analyse the determination accuracy when not all radiation data are available and modelling of the missing data is required. Since radiative transfer models require a lot of information that is usually not available, we concentrate only on the determination accuracy achievable with empirical models. The simulations show that uncertainties in the calculation of the diffuse irradiance may lead to Tmrt uncertainties of up to ±2.9 K. If long-wave radiation is missing, we may expect an uncertainty of ±2 K. If modelling of diffuse radiation and of longwave radiation is used for the calculation of Tmrt, we may then expect a determination uncertainty of ±3 K. If all radiative fluxes are modelled based on synoptic observation, the uncertainty in Tmrt is ±5.9 K. Because Tmrt is only one of the four input data required in the calculation of UTCI, the uncertainty in UTCI due to the uncertainty in radiation fluxes is less than ±2 K. The UTCI uncertainties due to uncertainties of the four meteorological input values are not larger than the 6 K reference intervals of the UTCI scale, which means that UTCI may only be wrong by one UTCI scale. This uncertainty may, however, be critical at the two temperature extremes, i.e. under extreme hot or extreme cold conditions.
Starting Page	537
Ending Page	555
Page Count	19
File Format	PDF
ISSN	00207128
Journal	International Journal of Biometeorology
Volume Number	56
Issue Number	3
e-ISSN	14321254
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-02-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thermal climate index Solar radiation UTCI Accuracy Animal Physiology Meteorology/Climatology Plant Physiology Biophysics and Biological Physics Environmental Health Environment
Content Type	Text
Resource Type	Article
Subject	Ecology Health, Toxicology and Mutagenesis Atmospheric Science

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The uncertainty of UTCI due to uncertainties in the determination of radiation fluxes derived from measured and observed meteorological data.

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