Abstract
This paper analyzes the spatio-temporal variability of sunshine duration in the south of the Pampeana region as a first approach to solar climatic analysis, main input for the use of this resource. Hourly sunshine duration records from 1991 to 2015 in eight Argentine cities were analyzed using statistics and geospatial techniques. In addition, we analyzed the frequency of clear sky and overcast days in order to relate it to the sunshine duration variability. Sunshine duration in the Pampeana region presented a linear gradient increasing in an east-west direction. An inverse relationship between the mean sunshine duration and coefficients of variation was found in all the cities. The highest mean values of sunshine duration were recorded located between 62°W and 65°W, where the lowest variability was also registered. The city of Mar del Plata showed the lowest mean values of sunshine duration (4.5 h) and the highest percentage of variability (78.1%), whereas Río Colorado recorded the highest mean values of sunshine duration (7.5 h) and the lowest variability (51.1%) over the observation period. During the warm season, it was recorded a difference of 3.7 h in the mean SD values between the stations Río Colorado and Mar del Plata. The spatial distribution of the solar resource in the Pampena region is markedly affected by weather systems playing at the regional scale of South America. In the cold season, the west-east movement of the high pressure cells promotes the occurrence of Sudestadas, which explain the variability of sunshine duration over the coastal areas.






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Acknowledgements
The present research was carried out within the framework of the research project “Physical Geography Applied to the study of the interaction between society and nature. Problems at various tempo-spatial scales” (24/G078) led by Dr. Alicia M. Campo and subsidized by the General Secretary of Science and Technology of the Universidad Nacional del Sur.
The authors of this work gratefully appreciate the cooperation of the Servicio Meteorológico Nacional (SMN) that has kindly provided the data presented herein.
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Fernández, M.E., Gentili, J.O. & Campo, A.M. Sunshine Duration Analysis as a First Step to Estimate Solar Resource for Photovoltaic Electricity Production in Middle Latitudes. Environ. Process. 5, 313–328 (2018). https://doi.org/10.1007/s40710-018-0298-3
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DOI: https://doi.org/10.1007/s40710-018-0298-3