Archived project

Application of satellite data for the homogenisation of ground-based measurements of solar radiation reaching the ground: analysis of radiation variability in Poland in the last 25 years

Goal: The aim of the project is to develop and verify a method for detecting errors in ground-based measurement data on global solar radiation reaching the Earth's surface, and to devise a method for homogenising these data. To this end, the project will use high-resolution satellite data on solar radiation. The method for quality control and restoring homogeneity in measurement data developed in this project will make it possible to verify quality of radiation measurements in their native resolution. This is of the utmost importance for advancing research on solar radiation. The base of homogenic ground-based climatological data on global solar radiation in Poland, elaborated as part of the project, is made available to other researchers in the form of a digital repository. Thanks to that, it will be possible to use the results of the project in many applications, among others in agriculture and solar industry.

Date: 1 July 2018 - 1 July 2021

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Kinga Kulesza
added 2 research items
Well-maintained and regularly calibrated measuring instruments provide the most accurate solar radiation data. This extremely valuable research material makes it possible, among others, to analyse variability in solar radiation over the long term and its dependence on other atmospheric state elements such as cloud cover and atmospheric aerosol concentration. Unfortunately, ground-based measurements of solar radiation are often subject to various errors which are very difficult to detect. This is why quality control procedures and homogenisation of data are essential and should be performed prior to further analyses. This paper presents a method for quality control and homogenization of solar radiation data, which builds on the bias-based quality control (BQC) method (Urraca et al., 2017), and is tailored specially for detecting single erroneous daily values, and very long periods of small errors. The method was tested for 16 ground-based stations located in Poland for the period 1991–2015. In comparison with the number of errors detected by the BQC method, the number of detected errors increased significantly: 130 to 2890 more erroneous days were detected at each station. Consequently, the number of inhomogeneous data sets was reduced from 8 to 3 stations. The values on the days considered as erroneous were replaced with debiased values originating from the Surface Solar Radiation Data Set – Heliosat, Edition 2 (SARAH-2). The presented methodology can be also of use in any other places, especially those with many single erroneous days and no metadata publicly available.
Ground-based measurements of global solar radiation are often subject to various errors which are very difficult to detect. This is why quality control procedures and homogenisation of data are essential and should be performed prior to further analyses. We present homogeneous global solar radiation data set, without any gaps, for 16 ground-based stations located in Poland for the period 1991-2015. The data set was prepared with a modification of bias-based quality control (BQC) method (developed by Urraca, and presented in 2017), tailored specially for detecting single erroneous daily values (mostly caused by a failure of the measuring equipment), and very long periods of small errors (mostly caused by a miscalibration of the measuring equipment). The values on the days considered as erroneous were replaced with debiased SIS SARAH-2 values. In many situations the data were visually checked to make sure that the prepared set constitutes the best possible climatology of actinometric data in Poland.
Kinga Kulesza
added a project goal
The aim of the project is to develop and verify a method for detecting errors in ground-based measurement data on global solar radiation reaching the Earth's surface, and to devise a method for homogenising these data. To this end, the project will use high-resolution satellite data on solar radiation. The method for quality control and restoring homogeneity in measurement data developed in this project will make it possible to verify quality of radiation measurements in their native resolution. This is of the utmost importance for advancing research on solar radiation. The base of homogenic ground-based climatological data on global solar radiation in Poland, elaborated as part of the project, is made available to other researchers in the form of a digital repository. Thanks to that, it will be possible to use the results of the project in many applications, among others in agriculture and solar industry.