Applicability Assessment of ISCCP-FH Radiation Product over the Tibetan Plateau During 1984-2017
The shortage of long-term satellite radiation products has restricted the study of radiation spatiotemporal variation over the Tibetan Plateau (TP). This paper presents evaluation of the state-of-the-art satellite products called ISCCP-FH （hereinafter to be refered as FH） over the TP. The all-sky OLR, downward shortwave radiation (SWD), upward longwave radiation (LWU) and downward longwave radiation (LWD) during 1984-2017 were compared with observation. The results indicate that the deviations of radiation flux climatology are within 5%, slight error exists in OLR and SWD while large bias is found in LWU. FH radiation fluxes are properly increasing in winter, the trends of OLR and LWD are consistent with observations in all four seasons but LWU weakens falsely. The FH shortwave radiation is generally better than longwave over the TP. The longwave radiation errors can be attributed to that air temperature error would overestimate LWD climatology and trend, and the influence of surface temperature on LWU is opposite. The radiation model, cloud and moisture differences may result in appreciable underestimation of LWD, while the calculation process of FH partly corrects the underestimation of LWU. This study would provide some references for the future use of FH products.