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FY-2G卫星两种云订正产品在湖南的对比分析

Comparative analysis of two cloud products from FY-2G satellite in Hunan Province

  • 摘要: 使用2015年7月-2016年6月FY-2G卫星逐小时总云量和云覆盖率两种产品,采取区域平均和距离平方反比方法将其分别插值到湖南省有云观测的34个气象站点,并对总云量产品进行分站点滑动回归订正,从而分析上述两种产品的总体一致率和不同实况云量条件下的一致率。结果表明:云覆盖率产品和经过订正的总云量产品在湖南省的总体一致率分别为74.4%和74.8%;云覆盖率产品在实况少云和满云的情况下其一致率较高,但在实况多云时一致率仅为22%;经订正的总云量产品在多云和满云时的一致率高于云覆盖率产品,在少云情况下由于订正误差导致其一致率降低,但可通过选择性订正的方式在一定程度上得以避免。在湖南省使用订正后的卫星总云量作为地面云观测的补充或替代更为合适。

     

    Abstract: Using regional average and inverse distance square methods, we interpolated Cloud-Total-Amount (CTA) and Cloud-Fraction-Rate (CFR) data provided by FY-2G satellite from July 2015 to June 2016 to 34 meteorological stations with cloud observations in Hunan Province. We then revised CTA data by using moving regression correction method, and performed an analysis of the overall consistency of the two products and the consistency under different cloud conditions. The results indicate that the consistent rate of CFR data and revised CTA data in Hunan are 74.4% and 74.8%, respectively. There is a high consistency of CFR in the conditions of sunny and cloudy, while the consistency is only 22% under the conditions of overcast. Consistent rate of revised CTA data is higher than CFR under conditions of overcast and cloudy, and it can be increased by using selective correction method under the condition of sunny. It is more appropriate to use the revised CTA data as a supplement or substitute for surface cloud observations in Hunan Province.

     

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