Based on the infrared radiation transfer model, the outgoing longwave radiation (OLR) and Channel 5 radiance of Fengyun-3B (FY-3B) satellite visible infrared radiometer (VIRR) were simulated for 3812 global soundings. Using regression analysis of the simulations, an inverse model, which connected the flux equivalent brightness temperature with the channel brightness temperature, was derived. By applying the model to the FY-3B VIRR L1 data, the global OLR data at the time of the passing of the FY-3B were processed. The quality of the data was validated by comparing it with that of the NOAA-18 satellite's advanced very high resolution radiometer (AVHRR). The validation results show root mean square errors in the range 10-13 W/M 2 when comparing the daily average OLR of the VIRR with that of the NOAA-18 AVHRR, and the correlation coefficients were in the range 0.97-0.98. The larger RMSE is mainly due to the different passing times of the two satellites for the specific locations on the Earth. An example of the OLR data and its preliminary applications are given. OLR, infrared radiation transfer, inverse model, regression analysis, validation Citation:Wu X, Yan J J. Estimating the outgoing longwave radiation from the FY-3B satellite visible infrared radiometer Channel 5 radiance observations. Chinese Sci Bull, 2011Bull, , 56: 34803485, doi: 10.1007 The visible infrared radiometer (VIRR) on board the Fengyun-3B (FY-3B) polar orbiting meteorological satellite is an instrument similar to the National Oceanic and Atmospheric Administration (NOAA) satellite's advanced very high resolution radiometer (AVHRR). It has 10 channels to observe the shortwave and longwave radiations reflected and emitted by the Earth's atmospheric system. The split window, Channels 4 and 5, of the VIRR, are similar to that of the AVHRR. The spectrums of the VIRR are listed in Table 1. Traditionally the brightness temperature of the AVHRR Channel 5 has been adopted to calculate the outgoing longwave radiation flux (OLR) at the outer extremes of the atmosphere through the equation [1]:B5 . In the NOAA National Environmental Satellite, Data, and Information Service (NESDIS), the equation has been used to produce OLR data for more than 30 years. OLR data have been widely studied by scientists in climate models, predictions and diagnoses. In November 2010, China successfully launched the FY-3B polar orbiting meteorological satellite and the satellite ground application system began its operation in February 2011. Subsequently, data from the FY-3B [2] have been archived and distributed on the web. The OLR data are some of the data available. Developing the OLR inverse model of VIRRThe development of the OLR inverse model for the VIRR was based on infrared radiation transfer simulations [3][4][5] for a large number of atmospheric soundings and regression analysis. First, the OLR and Channel 5 radiance of VIRR were simulated for each sounding profile. Then a regression equation was derived by statistically analyzing the simulated results. Figure 1 sho...
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