Journal of Arid Meteorology

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Spatial and Temporal Distribution Characteristics of Direct Solar Radiation over Rugged Terrains in Sichuan Province

YUAN Shujie 1, LI Yuchun 1, XIANG Le 1, ZHANG Yiwei 2   

  1. 1. Chengdu University of Information Technology, Chengdu 610225, China;
    2. Xinxiang Meteorological Bureau of He’nan Province, Xinxiang 453000, China
  • Online:2016-02-29 Published:2016-02-29

起伏地形下四川省太阳直接辐射时空分布特征

袁淑杰1李钰春1向乐1张益炜2   

  1. 1. 成都信息工程大学,四川成都610225;
    2. 河南省新乡市气象局,河南新乡453000
  • 作者简介:袁淑杰(1966- ),女,河北抚宁人,博士,教授,研究方向为气候资源利用、气象防灾减灾、应用气象学. E-mail:ysj@cuit.edu.cn
  • 基金资助:

    四川省软科学研究(2013ZR0081)、成都信息工程大学科研基金(KYTZ201305)共同资助

Abstract:

A distributed model based on DEM data for calculating solar direct radiation (DSR) over rugged terrains (RT) in Sichuan Province was established considering the influence of slope, aspect, and mutual shielding topography by using meteorological observation data at 159 weather stations of Sichuan Province and solar radiation data of 9 weather stations in Sichuan and surrounding areas firstly, and the spatial distribution and temporal variation tendency of DSR over RT were analyzed based on a DEM data with resolution of 90 m×90 m . The results are as follows:(1)The latitudinal distribution of DSR over RT was not obvious, and the influence of height above sea level, sunshine percentage, the slope, aspect and mutual shielding topography on DSR’s spatial distribution was great. (2)The total annual DSR was lower in the eastern basin with values less than 1 300.0 MJ·m-2, it was higher in western plateau and Panxi area with values ranged from 1 900.0-3 486.9 MJ·m-2. (3)The temporal change of DSR was obvious, the areas with DSR values less than 1 000.0 MJ·m-2 had an increasing tendency in eastern Sichuan, and the areas with DSR values more than 2 800.0 MJ·m-2 had a decreasing tendency in western Sichuan. The climate tendency rate of DSR of the total annual amount or in January and July over RT was less than zero in Yibin, Dujiangyan, Nanchong, Maerkang of Sichuan Province.

Key words: Sichuan Province, rugged terrains, DSR, distributed model

摘要:

利用四川省159个地面常规气象观测站及周边9个太阳辐射站观测资料,基于数字高程模型(DEM)数据,考虑坡度、坡向和地形遮蔽作用的影响,研制起伏地形下太阳直接辐射分布式模型。结合四川省90 m×90 m分辨率的DEM数据,分析起伏地形下四川省太阳直接辐射空间分布特征和时间变化趋势。结果表明:(1)四川省太阳直接辐射纬向分布不明显,受海拔高度、日照百分率、局地地形影响较大;(2)四川省太阳直接辐射年总量东部盆地较低,<1 300.0 MJ·m-2,川西高原及攀西地区较大,在1 900.0~3 486.9 MJ·m-2之间;(3)四川省太阳直接辐射时间变化明显,川东盆地太阳直接辐射<1 000.0 MJ·m-2的地区有增加趋势,川西地区>2 800.0 MJ·m-2的区域在减小,四川省宜宾、都江堰、南充、马尔康太阳直接辐射年总量、1月、7月气候倾向率均<0。

关键词: 四川省, 起伏地形, 太阳直接辐射, 分布式模型

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