Simple Analysis on Change Features of Total Solar Radiation in Sanjiang Plain

摘要

The yearly, quarterly, monthly and daily change tendencies of total solar radiation at Jiamusi station of Sanjiang Plain were analyzed by statistical approach such as linear tendency estimate with its hourly ground meteorological observation data during 1986 to 2015. The research results indicated that the yearly tendency rate of total solar radiation was increasing obviously, with the velocity of 114.30 M J/(m 2 -10 a ) , while the yearly total solar radiation was 3 667.28 - 4 935.88 MJ/mz, and that of March to September was higher than the average. The summer total solar radiation was the most, followed by spring, and that of all the seasons increased except autumn which decreased. The daily total solar radiation increased rapidly from the last ten days of January and reached the peak at the end of June, while it plummeted from the beginning of September to the middle ten days of November, then tended to be gentle. The amount of 5-year total solar radiation was less after 1980s while it was more before 1990s, and the total solar radiation was decreasing from 1996 to 2005 but on the contrary it kept increasing in recent ten years. Over the years the earliest record of solar radiation appeared at 05 ：00 and the latest at 20 ：00, and the daily variation of the hourly solar radiation got a normal distribution centered on 12：00 to 13：00.