摘要
基于30m×30m分辨率的DEM,利用起伏地形下的太阳总辐射计算模型和遥感反演地表反照率得到马衔山山顶2013-07-23 11:30的太阳总辐射和短波净辐射的空间分布,并重点分析了多年冻土区的辐射特征.结果表明,局地地形严重影响太阳辐射的空间分布,使得不同坡向、坡度间的辐射存在显著的差异.地势较平的阳坡坡面、山脊的太阳总辐射较大;较陡的阴坡沟谷地带的太阳总辐射较小.多年冻土区地势较低,接收到的太阳总辐射较大,地表反照率较低,短波净辐射相对较大.但蒸发潜热耗热和干泥炭层的导热系数较低,降低了进入浅层土壤的热量,加之进入土壤的热量主要用于融化地下冰,使得土壤温度较低.因此,尽管局地地形对区域辐射收支有着重大影响,但地表特征、土壤性质等通过影响能量的分配状况,对多年冻土的发育和保护起控制作用.
Based on 30 m × 30 m digital elevation model, this paper combined solar total radiation calculation model over rugged terrain with surface albedo retrieved, the spatial distribution of the total solar radiation and the short-wave net radiation of Mahan Mountain at 11： 30 on July 23, 2013 were obtained, and then the radiation characteristics of permafrost region are mainly analyzed. The results show that local terrain has strong influence on the spatial distribution of solar radiation. The sunny slopeand ridge of flatter area can get more solar total radiation, the shady slope and valleys of steep area is smaller contrary. The permafrost regions is flat, which receives more solar total radiation and the surface albedo is small, large short-wave net radiation is larger. But due to the loss of latand thermal conductivity of dry peat layer is lower, the heat into the shalloheat is mainly used for melting underground ice so that soil temperature is lower. Therefore, although the local terrain has a significant effect on regional radiation budget, the surface features and soil properties influence the distribution of energy distribution and contribute to the development and protection of permafrost.
出处
《西北师范大学学报（自然科学版）》
CAS
北大核心
2017年第6期88-96,共9页
Journal of Northwest Normal University(Natural Science)
基金
中国科学院百人计划资助项目(51Y551831002)
关键词
太阳辐射
短波净辐射
能量平衡
局地地形
马衔山
solar radiation% net short-wave radiation% energy balance% local topography % MahanMountain
