高分五号痕量气体差分吸收光谱仪的地表UV-B辐照度初步反演
Preliminary inversion of surface UV-B irradiance based on GF-5 environmental trace gas monitoring instrument
- 2023年27卷第8期 页码：1856-1865
DOI： 10.11834/jrs.20210603
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摘要
地表UV-B辐照度会对地球生态系统产生非常重要的影响。利用卫星遥感探测，可实现全球地表UV-B辐照度的长期探测，对于生态系统评估和大气科学研究等具有重要意义。目前基于国产卫星的地表UV-B辐照度产品较少，因此本文开展了高分五号卫星大气痕量气体差分吸收光谱仪（EMI）的地表UV-B辐照度的初步反演。首先基于地表UV-B辐照度的敏感性分析结果，建立无气溶胶情况下晴空地表UV-B辐照度查找表。随后提出了云、气溶胶场景下的校正方法，实现了全球地表UV-B辐照度的反演。最后，为验证该算法的准确性，将EMI结果分别与欧洲OMI卫星数据、WOUDC地面站点数据进行了对比，其中与OMI数据的相关系数大于0.9，与WOUDC地面站点数据的相关系数达到0.91。研究结果表明EMI载荷的地表UV-B辐照度产品准确性高，为后续地表UV-B辐照度等相关产品的发布提供研究基础，也证明了该载荷在全球地表紫外辐射时空分布监测应用中的能力。
Abstract
Surface UV-B irradiance can have a very important impact on the ecosystem. In the modern industrialization process, human activities have led to significant changes in the atmospheric system, such as the reduction of stratospheric ozone, emergence of ozone holes, tropospheric atmospheric composite pollution, and other phenomena, and changes in the global surface UV-B irradiance, all of which significantly affect human health (e.g., skin cancers) and ecological environment (e.g., reduced crop yields). Therefore, monitoring the surface UV-B irradiance has become essential.,Surface UV-B irradiance can be monitored in two ways, namely, by ground-based monitoring and satellite monitoring. Ground-based platform surface UV-B irradiance monitoring faces several disadvantages, including its sparse site distribution and short operation time. Meanwhile, satellite remote sensing technology can realize a long-term monitoring of global surface UV-B irradiance, which is important for ecosystem assessment and atmospheric science research. Given the availability of few surface UV-B irradiance products based on domestic satellites, this paper carries out a preliminary inversion of the surface UV-B irradiance from the environmental trace gas monitoring instrument (EMI) on the GF-5 satellite.,First, a sensitivity analysis of those factors influencing surface UV-B irradiance was performed using the SCIATRAN model to reduce the time consumed in lookup table construction and lookup interpolation. On the basis of the results of the sensitivity analysis of surface UV-B irradiance, the input parameter nodes of the clear-sky surface UV-B irradiance lookup table are reasonably determined, and the surface UV-B irradiance of EMI under clear-sky conditions is calculated. Second, the correction methods applied in the presence of clouds and aerosol scenarios were examined. The surface UV-B irradiance under clear sky conditions was corrected by using the cloud correction method based on Lambert equivalent reflectance, and the aerosol correction method based on aerosol index was used to obtain the surface UV-B irradiance under actual conditions. After applying these corrections, the global surface UV-B irradiance was eventually inversed. Third, to verify its correctness, the results of the EMI surface UV-B irradiance algorithm were compared with the European OMI satellite and WOUDC site data at the same time by using a linear fitting method. The correlation coefficient R with the OMI data exceeded 0.9, and the correlation coefficient R with the WOUDC site data exceeded 0.91, thereby suggesting that the results of the proposed algorithm show high agreement with both the OMI and WOUDC data. However, several shortcomings were noted. For example, the surface UV-B irradiance inversion algorithm of EMI shows high accuracy in the region with low surface albedo, while the results are large in the region with high surface albedo.,The surface UV-B irradiance products of EMI are highly accurate and can provide a research basis for the subsequent releases of surface UV-B irradiance and other related products. These results also demonstrate the capability of the payload in global surface UV radiation spatial and temporal distribution monitoring applications and provide a basis for the long-term monitoring of the spatial and temporal variations of surface UV-B irradiance.
关键词
遥感痕量气体差分吸收光谱仪地表UV-B辐照度SCIATRAN模型查找表
Keywords
remote sensingenvironmental trace gas monitoring instrumentsurface UV-B irradianceSCIATRANlookup table
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中国科学院大学 地球与行星科学学院
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