Ítem
Ministerio de Ciencia e Innovación (Espanya) | |
Sánchez Lorenzo, Arturo | |
2015 | |
A data set of quality checked daily sunshine duration measurements was collected from 104 Italian sites over the 1936 to 2013 period. Monthly mean values were homogenized, projected onto a grid, and subjected to principle component analysis, which identified two significantly different regions: North and South. Sunshine duration temporal evolution is presented, and possible reasons for differences between the two regions are discussed in the light of a comparison with the trends found in observations of total cloud cover and with results from two neighboring regions: the Alps and Spain. In addition, trends for irradiance records, estimated from sunshine duration records using the angstrom ngstrom-Prescott formula, are presented too. The major feature of the trends, an increase in sunshine duration from the mid-1980s, was common to both northern and southern Italy; the decrease in the preceding 30 year period was not, as northern Italy had a lower rate of decrease than southern Italy. The few records available during the earliest period of the data set indicate that sunshine duration in Italy increased from the mid-1930s to the mid-1950s. The further steps needed to identify and quantify the mechanisms giving rise to the observed trends and to the reported regional differences in dimming and brightening are outlined A. Sanchez-Lorenzo was supported by the Postdoctoral Fellowships 2011-BP-B-00078 and JCI-2012-12508, and the Spanish Ministry of Science and Innovation Projects CGL2010-18546 and CGL2011-27574-C02-02 |
|
application/pdf | |
http://hdl.handle.net/10256/11841 | |
eng | |
American Geophysical Union (AGU) | |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.bspc.2012.12.00310.1002/2014JD022560 info:eu-repo/semantics/altIdentifier/issn/2169-897X info:eu-repo/semantics/altIdentifier/eissn/2169-8996 info:eu-repo/grantAgreement/MICINN//CGL2010-18546/ES/LAS NUBES Y SUS EFECTOS SOBRE LA RADIACION: DEL ESTUDIO DE SITUACIONES A ESCALA LOCAL AL ANALISIS CLIMATOLOGICO DE ALCANCE GLOBAL. INTERACCIONES CON EL AEROSOL ATMOSFERICO/ |
|
Tots els drets reservats | |
Radiació solar -- Itàlia
Solar radiation -- Italy |
|
Sunshine duration variability and trends in Italy from homogenized instrumental time series (1936-2013) | |
info:eu-repo/semantics/article | |
DUGiDocs |