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Title:
 
Variability and Trend in the Annual Solar Irradiation Determined from Meteosat Satellite Data
 
Author(s):
 
T. Huld, J. Trentmann
 
Keywords:
 
Solar Radiation, System Performance
 
Topic:
 
OPERATIONS, PERFORMANCE AND RELIABILITY OF PHOTOVOLTAICS (FROM CELLS TO SYSTEMS)
Subtopic: Operation of PV Systems and Plants
Event: 31st European Photovoltaic Solar Energy Conference and Exhibition
Session: 5BV.1.3
 
Pages:
 
2073 - 2076
ISBN: 3-936338-39-6
Paper DOI: 10.4229/EUPVSEC20152015-5BV.1.3
 
Price:
 
 
0,00 EUR
 
Document(s): paper
 

Abstract/Summary:


We present a study of the variability of the annual solar irradiation and the long-term trend in solar radiation, based on the retrieval of solar radiation data from satellite images. For Europe and Africa the data from the METEOSAT satellites comprise the period 1983-2013 while for Asia the eastern METEOSAT satellites have been used for the period 1999-2014. Results show that over most desert areas the year-to-year variability is low, with a relative standard deviation of 1% or less. Temperate climates show higher variability at 3-5%, while the highest variability is found in mountain areas in Europe and Asia where the standard deviation may reach 7-8%. An analysis of the long-term trend in solar radiation shows that in most areas the calculated trend is not statistically significant at the p<0.05 level. Areas showing a significant trend are most of Eastern Europe (+2 to 3% per decade), Tropical West Africa (-1 to -2 %/decade) and parts of Central Asia (up to +5% per decade). One weakness of the present study is that long-term averages of the aerosol optical depth have been used whereby variations and trends in aerosols have not been taken into account.