复杂地形下光合有效辐射的遥感估算研究  

Study on Estimation of Photosynthetically Active Radiation under Complicated Topography by Remote Sensing

作　　者：牛晓俊[1,2,3] 冯文兰[1] 王永前[1] 黄宇倩[1] 曾林[2,3] 

机构地区：[1]成都信息工程大学资源环境学院,成都610225 [2]西藏高原大气环境科学研究所,拉萨850000 [3]中国气象局成都高原气象研究所,成都610072

出　　处：《高原气象》2017年第4期1029-1038,共10页Plateau Meteorology

基　　金：国家自然科学基金项目(41301653;41631180;41471305);四川省教育厅创新团队项目(16TD0024);中国气象局成都高原气象开放实验室基金项目(LPM2016002)

摘　　要：光合有效辐射(PAR)在不同的陆地生态系统模型中都是重要的输入参数,直接利用卫星遥感数据估算光合有效辐射有利于在空间上强化空间信息的连续性与差异性。针对复杂地形条件下遥感估算模型参数存在的不确定性,以及遥感获取的瞬时PAR难以满足实际应用需求的问题,本研究在岷江上游地区开展了复杂地形下光合有效辐射的遥感估算研究。利用MODIS标准大气产品,采用简化的大气辐射传输模型,综合考虑复杂地形下太阳辐射入射角的变化以及地形遮蔽和邻近地形辐射增强的作用,完成了对瞬时PAR估算结果的地形校正,并通过线性插值方法得到了PAR日总量数据。将估算得到的岷江上游2013年22个晴空天气下的PAR与中国科学院茂县山地生态系统定位研究站同期实测数据的对比显示,瞬时光合有效辐射平均估算误差为7.26%,日总量数据的平均估算误差也为7.26%。结果表明,该模型反演估算瞬时光合有效辐射和时间尺度上推至PAR日总量都能够较好的适用岷江上游的复杂地形条件。The photosynthetically active radiation（ PAR） is one of the important input parameters in different terrestrial ecosystem models. The estimates of PAR by satellite remote sensing data are beneficial to strengthening continuity and diversity of spatial information. There are uncertainties in the parameters estimated by remote sensing under the complex terrain conditions,meanwhile,the instantaneous PAR estimated by remote sensing is unable to satisfy the requirements in practical application. Therefore,a remote sensing estimation model was developed in this paper to estimate PAR under complicated topography and exemplified in the upper Min River Basin.The instantaneous PAR was estimated based on a simplified atmosphere radiation transfer model and MODIS standard atmospheric products. Then the estimates results were corrected by comprehensive considering variation of incident angle of solar radiation,terrain masking and the effect of radiation enhancement caused by adjacent terrain under the complicated topography. The daily PAR was obtained by linear interpolation algorithm. The instantaneous PAR of the upper Min River Basin on the 22 sunny days in 2013 were estimated. Comparisons of satellite-based and field-based of Maoxian station estimates indicated the average errors of the instantaneous PAR were 7. 26%,the daily PAR were also 7. 26%. The research results revealed that the instantaneous PAR and the daily PAR estimated by the model developed in this paper could be available to the complex terrain of the upper Min River Basin.

关 键 词：岷江上游 瞬时光合有效辐射 光合有效辐射日总量 MODIS大气产品 地形校正 

分 类 号：P470.4[天文地球—大气科学及气象学]