| 1960年至2005年河西干旱区的日照时数变化时空特征分析 |
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| 引用本文： | 刘艳艳,张 勃,张耀宗,康淑媛.1960年至2005年河西干旱区的日照时数变化时空特征分析[J].资源科学,2009,31(9):1581-1586. |
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| 作者姓名： | 刘艳艳 张 勃 张耀宗 康淑媛 |
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| 作者单位： | 西北师范大学 |
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| 基金项目： | 公益性行业(气象)科研专项，甘肃省自然科学基金，* |
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| 摘 要： | 运用复值Morlet小波分析及非参数统计检验Mann-kendall法,并借助地统计软件ArcGIS(9.X)时黑河中上游1960年～2005年日照时数变化的时空特征进行了分析.结果表明:①近50年来年均日照时数呈现增加趋势,β值为18.57;眷、夏、秋、冬四季日照时数均为上升趋势,β值分别为7.13、7.72、3.18和6.96;②年、季节的日照时数变化在空间上存在差异,对于年均日照时数而言,酒泉、金塔、鼎新一线为日照时数升降的分界线,以北为主要的上升趋势区,升幅大于8.0h/年;以南则主要表现为下降趋势,降幅在(1.9～31.5)h/年;③日照时数年变化具有12年左右的主振荡周期和5年左右的次振荡周期,年代际特征明显.日照时数在1975年开始由显著增加趋势变为不明显的减少趋势;④年、夏冬两季日照时数的变化主要是大气中云量变化引起的,而春秋两季日照时数变化的原因还需进一步探讨.
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| 关 键 词： | 干旱区 日照时数 时空特征 趋势分析 周期 黑河中上游地区 |
Analysis of Temporal and Spatial Characteristics of Sunshine Duration Change in Hexi Arid Region |
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| LIU Yanyan,ZHANG Bo,ZHANG Yaozong and KANG Shuyuan.Analysis of Temporal and Spatial Characteristics of Sunshine Duration Change in Hexi Arid Region[J].Resources Science,2009,31(9):1581-1586. |
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| Authors: | LIU Yanyan ZHANG Bo ZHANG Yaozong and KANG Shuyuan |
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| Abstract: | This paper analyzes the temporal and spatial characteristics of sunshine duration change in recent 50 years in Heihe River Valley, which is located in the Middle of Hexi Corridor. Morlet wavelet analysis and non-parametric statistical methods, such as Mann-kendall and Geostatistic software ArcGIS (9.X) are employed. The results show that in the study area, the annual average sunshine duration increases at an average rate of 18.77h/a in recent 50 years, but this tendency is not significant. In addition, the tendency is different from most other areas in China. The increasing tendency occurs throughout the four seasons with rates of 7.13h/a, 7.72h/a, 3.18h/a and 6.96h/a from spring to winter. Annual and seasonal changing trends of sunshine duration in Heihe River Valley exhibited spatial variation. In term of annual mean sunshine duration, Jiuquan, Jinta and Dingxin were the boundary of sunshine duration change. There was an increasing tendency in the north of Hexi corridor, and the changing range of sunshine duration was above 8.0h/a, while sunshine duration in the south decreased by about 1.9~31.5h/a. Moreover, annual sunshine duration change in Heihe River Valley also exhibited temporal variation. Put ascensive central Jinta was regarded as the center for increase in sunshine duration, while Gaotai was described as the center for decrease. Jinta exhibited increasing tendency in 1960s, but from the beginning of 1970s to the middle of 1980s, sunshine duration in Jinta displayed a downtrend. After that, it demonstrated an increasing tendency again. In 1960s, there was a slight increasing tendency in Gaotai, but at the beginning of the 1970s, sunshine duration decrease noticeably. From the beginning of 1980s to the middle of 1990s, sunshine duration in Gaotai showed an obvious increasing tendency. After the middle of 1990s, sunshine duration in Gaotai kept decreasing. Sunshine duration change in Heihe River Valley fluctuated with a cycle of 12 years and a subordinate cycle of 5 years, and it exhibited inter-decadal oscillation. There was a sudden change in sunshine duration in 1975, after which the increasing trend turned to a decreasing tendency. The significant changes can mean that cloudage led to the variation in annual and seasonal change of sunshine duration in the study area. The causation of sunshine duration change in spring and autumn is not covered in this paper and needs further study. |
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| Keywords: | Arid area Sunshine duration Trend analysis Cycles Heihe River Valley |
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