基于新疆地区不同下垫面类型的肖塘、和田、阿勒泰站辐射观测数据,评估FY-4A地表太阳辐射产品在该区域的适用性,并结合FY-4A的云覆盖率和沙尘检测数据,分析其误差来源。结果表明：从一致性来看,FY-4A与3个站点地面观测辐照度的相关系数均在0.8以上,肖塘站一致性最好,阿勒泰站次之,和田站最差。从误差方面看,FY-4A总体数值偏高且有着“高值低估,低值高估”的特点,其适用性在肖塘站最好,阿勒泰站次之,和田站最差,绝对误差分别为93.62、103.47、135.38 W/m2,FY-4A在3个站点的绝对误差均在夏季达到最大值（大于114.08 W/m2）,在冬季达到最小值（小于102.21 W/m2）;相较于11:00—14:00,3个站点在07:00—10:00和15:00—18:00对FY-4A的误差会更大。从误差来源看,云覆盖率大于80%时两者之间相对误差大于90%的最小占比为17.05%;晴空条件下,和田站无沙尘像元,肖塘和阿勒泰站沙尘像元较非沙尘像元绝对误差分别增大38.20和15.02 W/m2,有云条件下和田和阿勒泰站沙尘像元较非沙尘像元绝对误差分别增大43.43和22.37 W/m2,而肖塘站减小80.67 W/m2,这是由于该站点沙尘像元样本数超过一半分布在FY-4A辐射反演效果最好的范围。
Abstract
Based on radiation observation data from Xiaotang, Hetian, and Altai stations with different underlying surface types in Xinjiang, this study evaluates the applicability of FY-4A surface solar radiation products in the region. Combining FY-4A’s CFR and DSD products, the sources of errors are analyzed. Results indicate that, in terms of consistency, FY-4A correlates above 0.8 with ground observation radiation data at all three stations, with Xiaotang station exhibiting the best consistency, followed by Altai, and Hetian showing the least. In terms of errors, FY-4A generally exhibits higher values overall with a characteristic of ‘high values underestimate, low values overestimate’. Its applicability is best at Xiaotang station, followed by Altai, and poorest at Hetian, with mean absolute errors of 93.62 and 135.38 W/m2,respectively. FY-4A’s mean absolute errors at all three stations reaches maximum values in summer （greater than 114.08 W/m2） and minimum values in winter （less than 102.21 W/m2）. Compared to 11:00—14:00, errors are larger at 07:00—10:00 and 15:00—18:00 at all three stations. Analyzing error sources, when cloud cover exceeds 80%, the minimum proportion with a relative error greater than 90% is 17.05%. Under clear sky conditions, Hetian station has no dust pixels, while Xiaotang and Altai stations’mean absolute errors for dust pixels increase by 38.20 and 15.02 W/m2 respectively. Under cloudy conditions, Hetian and Altay stations’mean absolute errors for dust pixels increase by 43.43 and 22.37 W/m2 respectively, while Xiaotang station decreases by 80.67 W/m2 due to more than half of its dust pixels being in the optimal range for FY-4A radiation retrieval.
关键词
入射太阳辐射 /
卫星数据 /
地面观测 /
FY-4A /
云覆盖率
Key words
incident solar radiation /
satellite data /
surface observation /
FY-4A /
cloud covers
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基金
上海合作组织科技伙伴计划及国际科技合作计划项目（2022E01047）; 国家自然科学基金（42330603、42030612)
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