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Sunshine Hours Variation and Influence Factors of Nanao in Recent 53 Years

LIN Miao-qing et al(Nanao Weather Bureau of Guangdong,Nanao,Guangdong 515900)  
The author discusscd the sunshine hours variation of Nanao County in the last 53 years using sunshine hours,precipitation,cloud and vapor pressure data since Nanao Weather Station established.The results showed that:the average sunshine hours in July is longest in each year while it is shortest in February and March.In the four seasons,the autumn sunshine is the most while it is the least in spring.Sunshine hours have significant inter-annual change,from 60's to 90's is basically dropped.The first decade of the 21st century have risen instead.There was a strong quasi-28-year cycle in 53 years,besides from 1972 to 1995 there was a quasi-16-year cycle.Moreover,it was also found that precipitation is important factor to affect the sunshine variation,they have significant negative correlation.
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