The Application of Deep Convective Clouds in the Calibration and Response Monitoring of the Reflective Solar Bands of FY-3A/MERSI (Medium Resolution Spectral Imager)

摘要: Based on simulated reflectance, deep convective clouds (DCC) can be used as an invariant target to monitor the radiometric response degradation of FY-3A/MERSI (Medium Resolution Spectral Imager) reflective solar bands (RSBs). The long-term MERSI RSBs easily predicted using a quadratic fit monthly DCC mean except for 6 and 7, which suffer from instrument anomalies. DCC-based degradations show that blue (λ < 500 nm) water-vapor have degraded significantly, whereas near-infrared bands, total in four years are within 3% (excluding 3 20). For most rates greatest during first year orbit decrease over time. results derived consistent 2.5%, 11, 18 19, when compared with Aqua/MODIS(Moderate Imaging Sepetroradiometer) inter-calibration, multi-site earth calibration CRCS(Chinese Radiometric Calibration Site) Dunhuang desert vicarious methods. Overall, 2σ/mean uncertainty was 3%, validating temporal stability reflectances. method has reduced uncertainties water vapor other This is significant advantage method. saturation some may hinder effectiveness approach.