长江流域资源与环境 >> 2011, Vol. 20 >> Issue (09): 1073-.

• 自然资源 • 上一篇    下一篇

基于开源GIS的长江流域晴日辐射反演

张玉龙| 夏小玲| 陈正洪, |党海山| 张全发   

  1. (1.中国科学院武汉植物园水生植物与流域生态学重点实验室, 湖北 武汉 430074|2.湖北省气象能源技术开发中心, 湖北 武汉 430074|3.中国科学院研究生院, 北京 100049
  • 出版日期:2011-09-20

RETRIEVAL OF CLEARSKY RADIATION IN THE YANGTZE RIVERBASIN BASED ON OPENSOURCE GIS

ZHANG Yulong1,3, XIA Xiaoling1, CHEN Zhenghong2, DANG Haishan1, ZHANG Quanfa1   

  1. (1. Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China|2. Meteorological Energy Development Center, Wuhan 430074, China;3. Graduate Unirersity of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2011-09-20

摘要:

以开源GIS软件GRASS为平台,首次通过辐射过程模型r.sun和编程语言Shell实现长江流域500 m分辨率的晴日辐射反演(包括直接辐射、散射辐射和反射辐射),为了解长江流域辐射时空分布规律和相关宏观气候、生态建模奠定基础。结论如下:(1)精度验证表明,晴日辐射反演结果较理想;相关晴日指数的误差指标MPE、MAPE和RMSE分别为37%、75%和64%,r.sun模型可进一步用于中国其它区域;(2)长江流域晴日辐射年均日值为2424±245 MJ/(m2·d),其各组分差异显著,直接、散射、反射辐射分别占总辐射的842%、156%和02%;(3)晴日辐射空间分布梯度明显,沿三级地形阶梯向东辐射值及变异逐渐减小,海拔变化引起的大气衰减因素在决定晴日辐射分布时起重要作用;(4)晴日辐射季节分布不对称,月际变化总体呈倒“U”形分布;直接辐射和散射辐射变化趋势基本一致,但二者比例随大气浑浊度的变化波动剧烈。

Abstract:

Based on the platform of opensource geographic information system GRASS,500 m resolution datasets of clearsky radiation (including beam,diffuse and reflected radiation) in the Yangtze River Basin were firstly calculated with processmodel r.sun and programming language Shell,which can help to understand spatiotemporal pattern of energy over the basin, and provide data for macroclimatic and ecological modeling.The results are as follows:(1) Validations show that r.sun model on the retrieval of the clearsky radiation of the Yangtze River Basin performs relatively well,with the MPE (37%),MAPE (75%) and RMSE (64%) of related clearsky index.The model can be further used in other regions of China.(2) Annual mean radiation,with an average value 2424±245 MJ/(m2·d),has a significant gradient. Beam,diffuse and reflected components are quite different,with ratios of the annual average global radiation 841%, 156% and 3% respectively.(3) Global radiation and its variability both decrease along the three terrain ladders from west to east. Atmospheric attenuation along with the elevation plays an important role in the pattern of clearsky radiation.(4) Seasonal distributions of clearsky radiation are asymmetry,with the percentage order of the annual average global radiation,summer (316%)>spring (292%)>autumn(219%)>winter(173%).Monthly changes of the clearsky radiation share with the inverted “U”shaped curve.Monthly beam and diffuse radiation have similarly changing trend,but their proportion shifts with the atmospheric turbidity during the year

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