Analysis of actinometric measurements under all-sky and cloud-free conditions in Cáceres (Spain) for the period 1913–1920

Abstract

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Early sunshine duration and cloud cover records in Coimbra (Portugal) for the period 1891–1950

“…It is worth mentioning that the short time period used for this latter trend analysis (i.e., 1891–1913, 23 years long) can jeopardize the results and caution is needed interpreting these findings. A similar ‘early dimming’ has been reported in other studies over the Iberian Peninsula (Antón et al ., 2017; Aparicio et al ., 2019; Bravo‐Paredes et al ., 2019) as well as in other regions (e.g., Stanhill and Cohen, 2008; Matuszko, 2014; Stanhill and Achiman, 2017; Kazadzis et al ., 2018). On the other hand, there is no evidence of this ‘early dimming’ in the US (Stanhill and Cohen, 2005), or mixed evidences in Ireland (Pallé and Butler, 2002).…”

“…Documentary sources from the Iberian Peninsula have also provided ancient meteorological series from both Spain (Domínguez‐Castro et al ., 2014; Vaquero et al ., 2021) and Portugal (Alcoforado et al ., 2011). In particular, attention has also been paid to the recovery of long series related to solar radiation in the Iberian Peninsula (Antón et al ., 2014, 2017; Aparicio et al ., 2019; Bravo‐Paredes et al ., 2019; Obregón et al ., 2020). The data recovered and analysed in this work are part of this common effort.…”

Monitoring coastal areas: a brief history of measuring instruments for solar radiation

“…[10]. It is also known as the Arago-Davy actinometer since Marié-Davy used it for his measurements at the Montsouris Observatoire and described it in a work of 1875 [12]. The Arago actinometer, similar to the instrument described by Saussure, was not particularly precise as it was pointed out by several scholars as early as the beginning of the 20th century [3] [9].…”

“…In general, the systematic measures of solar radiation began in the second half of the twentieth century. There are few considerable sets of radiometric data before 1950 [12]: only some series of radiometric data collected for short periods (maximum 7-10 years) in some parts of Europe and the Mediterranean basin were recovered. In the period between the two World Wars the most remarkable actinometric observations were conducted by Gorczynsky in Poland, France, and Tunisia.…”

Recovery of early meteorological records from Extremadura region (SW Iberia): The ‘CliPastExtrem’ (v1.0) database

“…Campo Maior data were digitized in 2007 under Portuguese funded project SIGN but has not been published yet. Furthermore, Fernández‐Fernández et al (2015, 2017) retrieved qualitative temperature and precipitation data recorded in Zafra for the period 1750–1840, and Bravo‐Paredes et al (2019) studied actinometric measurements from Cáceres for the period 1913–1920.…”