中山大学学报自然科学版 ›› 2011, Vol. 50 ›› Issue (6): 120-124.

• 研究论文 • 上一篇    下一篇

近48年华南日照时数的变化特征

伍红雨,杜尧东,潘蔚娟   

  1. (广东省气候中心,广东 广州 510080)
  • 收稿日期:2011-02-21 修回日期:1900-01-01 出版日期:2011-11-25 发布日期:2011-11-25

The Change Characteristics of Sunshine Duration during the Past 48 Years in South China

WU Hongyu,DU Yaodong,PAN Weijuan   

  1. (Climate Center of Guangdong Province,Guangzhou 510080,China)
  • Received:2011-02-21 Revised:1900-01-01 Online:2011-11-25 Published:2011-11-25

摘要: 利用1961-2008年华南110个测站年日照时数资料,通过线性趋势分析、Mann-Kendall检验、功率谱分析和计算趋势系数等统计诊断方法,分析了华南年日照时数的时空特征和气候变化。结果表明:近48 a来,华南年平均日照时数整体上呈自南向北减少的分布特点,最高中心位于广西南宁(2 552 h),最低中心在广西金秀(1 172 h)。华南平均年日照时数以4.09 h/a的速率明显减少,高于全国平均值,并存在22 a和11 a的显著周期振荡,在1970年代后期发生突变。华南年日照时数长期趋势变化有明显的空间差异,大部分地区呈明显减少的趋势,其中有3个减少中心,分别位于广东深圳(-12.86 h/a),海南澄迈(-12.85 h/a)和广西横县(-11.85 h/a)。华南年平均日照时数的分布与总云量分布几乎完全相同,但它们的变化趋势大部分相反。广东大部分地区总云量在明显增加,日照时数在显著减少。

关键词: 日照时数, 总云量, 华南, 线性趋势, 变化特征

Abstract:

Based on the annual sunshine duration data from 110 observational stations during 1961-2008 in South China,the climatic changes and the spatial temporal features of sunshine duration were studied by using statistical diagnostic methods,including linear regression analysis,MannKendall test,power spectrum function and the computation of trend coefficients. The results show that the annual mean sunshine duration shows a decreasing trend from South China to North China in the past 48 years.The highest center is located in Nanning of Guangxi(2552 h)and the lowest center in Jingxiu of Guangxi(1172h).The annual sunshine duration has declined at a mean rate of 4.09 h/a,which is higher than that of China. The changes of annual sunshine duration show significant 22 year and 11 year periods,with an abrupt change in the late 1970s. The trend of sunshine duration in South China has a remarkable regional difference. Decreasing trend of sunshine duration is obvious in most part of South China. There are three decreasing centers, located in Shenzhen of Guangdong(-12.86 h/a),Chengmai of Hainan (-12.85 h/a)and Hengxian of Guangxi(-11.85 h/a)respectively. The distribution of the annual mean sunshine duration is in accord with that of total cloudiness,but the secular trend variation of sunshine duration is different from that of total cloudiness.In most part of Guangdong, the total cloudinessincreases and the sunshine duration decreases obviously.

Key words: sunlight duration, total cloudiness, South China, linear trend, change characteristics

中图分类号: