考虑复杂下垫面及云影响的新疆地面短波辐射卫星反演改进研究

Xinjiang is vast with one-sixth of the land of China, diverse underlying surface but the radiation observatories are scarce. Among the signals received by satellite, it is difficult to identify clouds against the underlying surface with the vast desert and three mountain ranges with ice and snow which causes error in the surface radiation data retrieved from satellite . In order to provide accurate surface radiation data and reliable decision-making basis for the study of climate change, radiation forecast and solar energy utilization, in this project the following studies will be carried out:.(1).Using the new version of DISORT which is DISORT 3,more accurate short wave radiative transfer model will be made to deal with the strong multi-scattering of the clouds and the bi-directional reflectance distribution function (BRDF) of the complex underlying surface, in Xinjiang desert, snow and ice area. .(2).Using the clouds and surface radiation monitoring data obtained from MODIS/Aqua, CALIPSO and CloudSat satellites in recent ten years, the model will be validated combined with data from surface observational data..(3).Based on the validated model and the long term satellite data, the short wave radiation budget of the surface considering the complex underlying surface in Xinjiang will be calculated to fill the vacancy of the surface wave radiation data. Moreover, the temporal and spatial distribution of it and its influencing factors will be comprehensively analyzed.

新疆地域辽阔，“三山夹两盆”的地形地貌复杂多样，而地面辐射观测站点稀少，且在广阔的沙漠、戈壁和冰雪上卫星接收到的信号中，云与下垫面难以区分，导致卫星反演的地面辐射数据存在较大误差。为了给太阳能开发利用、天气预报和气候变化等业务和科研提供准确的地面短波辐射数据，拟开展以下研究:（1）采用以最新版本经过改进的计算方法 DISORT3为核心的AccuRT辐射传输算法，考虑新疆沙漠、戈壁和冰雪区复杂下垫面条件，更准确地处理云强烈多重散射和复杂下垫面双向反射分布函数（ BRDF），建立准确的本地化大气短波辐射传输模型；(2)使用近十年MODIS/Aqua、CALIPSO 以及CloudSat卫星获得的云以及地表辐射监测数据，结合地面观测资料，对该模型进行验证；(3)利用验证后的该模型以及长期的卫星数据，通过AccuRT辐射传输算法反演出接近真实的新疆地表短波辐射并揭示其时空分布特征。

新疆地域辽阔，“三山夹两盆”的地形地貌复杂多样，而地面辐射观测站点稀少，且在广阔的沙漠、戈壁和冰雪上卫星接收到的信号中，云与下垫面难以区分，导致卫星反演的地面辐射数据存在较大误差。因此，本项目评估了卫星反演的和RegCM区域气候模式模拟的地面太阳辐射误差的时空分布规律，分析了云和气溶胶对太阳辐射的影响。采用优化过的SCM算法，通过地表反照率信息来准确识别新疆地区地表特性（分辨植被、沙漠、土壤以及冰雪），并基于MODIS/Aqua、CALIPSO以及CloudSat等卫星获得的云以及气溶胶监测数据，结合地面观测及其他资料建立了新疆区域本地化辐射传输模型，通过辐射传输模式系统反演出接近真实的新疆地表短波辐射数据并综合分析其时空分布，为太阳能开发利用、天气预报和气候变化等业务和科研提供相对更准确的地面短波辐射数据。

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