Archives of Surface Solar Radiation Measurements

Solar radiation data measured by the different national weather services and conforming to WMO standards are collected in various national archives and are available from national weather services. Much of this data has also been collected in two archives the Global Energy Balance Archive (GEBA) in Zurich, Switzerland [24], and the World Radiation Data Center (WRDC) archive in St. Petersberg, Russia, which was established by the WMO in 1964. GEBA has incorporated much of the data from the WRDC archive after strict quality control filtering, while the WRDC archive should be used with caution.

Data from the US is managed by the National Renewable Energy Laboratory's (NREL) Renewable Resource Data Center (RReDC, at website: www. nrel.gov/rredc). Although solar radiation has been measured in the US for about 75 a, first class long term data is available for only few of the stations in their network.

The World Radiation Monitoring Center (WRMC, http://www.bsrn.awi. de/) archives data from the Baseline Surface Radiation Network (BSRN, [25]), which is a small number of stations (currently about 40) in contrasting climatic zones, covering a latitude range from 80°N to 90°S, where solar and atmospheric radiation is measured with instruments of the highest available accuracy and with high time resolution (1 3 min). The BSRN program began in the late 1990s and is based on voluntary participation of organizations measuring radiation in different countries.

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