Homogenization of the long-term surface solar global radiation series at the Global Energy Balance Archive (GEBA)

I. Homogenization of the longest GEBA series over Europe (January 2011 - Summer 2011)

Researchers: Arturo Sanchez-Lorenzo (ETH Zürich, Switzerland), Jose Antonio Guijarro (AEMET, Spain), Michele Brunetti (ISAC-CNR, Italy), Martin Wild (ETH, Zürich).

In this first step we present an attempt to homogenize the long-term series over Europe currently available at the Global Energy Balance Archive (GEBA). The data set consists of about 45 series with monthly solar radiation series starting from the 1920s, Stockholm and Wageningen being the longest available records, going back to 1923 and 1928, respectively.

Three different relative homogeneity tests have been applied in order to detect and correct breaks in the series. The comparison of the results obtained with different tests is a recommended strategy in the homogenization field, especially when metadata are not available or there is a low station density in the data set. We used two versions of the Standard Normal Homogeneity Test (Alexandersson and Moberg, 1997), the RHTest (Wang et al, 2007) and the Craddock Test (Brunetti et al., 2006).

II. Homogenization of the longest GEBA series over the World (Summer 2011 - Summer 2012)

III. Homogenization of the full GEBA dataset (2012?)