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Jiang, GM (2010). Intercalibration of infrared channels of polar-orbiting IRAS/FY-3A with AIRS/Aqua data. OPTICS EXPRESS, 18(4), 3358-3363.

This work intercalibrated the infrared window channels 8 (12.47 mu m), 9 (11.11 mu m) and 19 (3.98 mu m) of the InfraRed Atmospheric Sounder (IRAS) aboard the Chinese second generation polar-orbiting meteorological satellite FengYun 3A (FY-3A) with high spectral resolution data acquired by the Atmospheric InfraRed Sounder (AIRS) aboard Aqua. A North Pole study area was selected according to the IRAS and AIRS' viewing geometry. The IRAS/FY-3A L1 data and AIRS/Aqua 1B Infrared geolocated and calibrated radiances (AIRIBRAD) in July of 2008 were used in this work. A sub-pixel registration method was developed and applied to the IRAS and AIRS images to improve the intercalibration accuracy. The co-located measurement pairs were picked out with absolute Viewing Zenith Angle differences less than 5 degrees (vertical bar Delta VZA vertical bar<5 degrees), absolute Viewing Azimuth Angle differences less than 90 degrees (vertical bar Delta VAA vertical bar<90 degrees) and absolute time differences less than 15 min (vertical bar Delta T vertical bar<15'). The results reveal that the convolved AIRS/Aqua measurements are highly linearly related to the IRAS/FY-3A measurements with correlation coefficients greater than 0.93, and calibration discrepancies exist between IRAS and AIRS channels indeed. When the brightness temperatures in IRAS/FY-3A channels change from 230.0 K to 310.0 K, the AIRS-IRAS temperature adjustment linearly varies from-3.3 K to 1.7 K for IRAS/FY-3A channel 8, from -2.9 K to 2.6 K for IRAS/FY-3A channel 9, and from -5.3 K to 1.1 K for IRAS/FY-3A channel 19. (C) 2010 Optical Society of America



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